JP7655466B2 - Power tools - Google Patents

Description

The present invention relates to a power tool.

At construction sites, for example, after concrete has been poured into a mold made of plates known as concrete panels, nail removal may be required when separating the panels from the frame. In such cases, mechanized power-operated nail pullers such as air-operated, hydraulic-operated, and electric-operated nail pullers are used. Conventional nail pullers used in such situations generally have a threaded hook for holding the nail, and are generally designed to move the hook up and down by transmitting the rotation of a motor to pull out the nail (see, for example, Patent Documents 1 and 2).

Japanese Utility Model Application Publication No. 5-5376 Japanese Patent Application Publication No. 11-48161

However, because the conventional powered nail pullers described above are designed to pull out nails by moving the hook up and down, there is a need to secure enough space (work area) within the housing to move the hook up and down, and there is a natural limit to how small they can be. Various tools, such as power nail pullers, are designed to be held by workers to perform tasks such as pulling out nails, and by their very nature, if the housing is large, it is likely to affect the ease of handling for the worker, and this is particularly noticeable when used by beginner-level users or users with relatively little strength. Poor ease of handling means that in the case of a nail puller, it is likely to be evident in terms of difficulty in aiming at nails and difficulty in hooking nails on the hook, which can lower the evaluation of the tool itself in terms of its operability and performance.

The present invention aims to provide an electric tool that has a structure that makes it easy to make it compact, and that controls the operation so that tasks such as pulling out nails can be easily performed, thereby improving the maneuverability and ease of use of the device.

One aspect of the present invention is a power tool used for tasks such as nail removal,
A main body portion,
An engagement member provided on the main body portion and having an engagement portion that engages with a part of a work target;
a sliding member that moves in and out of the body portion to move a part of the sliding member toward and away from the engaging member;
A drive source for operating the sliding member;
a control device that causes a drive source to cause a sliding member to perform a predetermined operation in response to a trigger signal input from an external device;
Equipped with
This is an electric power tool that slides a sliding member a predetermined length when a trigger signal is turned on.

For example, in a power tool used as a nail puller, a sliding member provided so as to be able to retract from the main body of the tool slides, and the engaging member fixed to the main body and (the tip of) this sliding member are relatively separated. At this time, the contact member (i.e., the tip of the sliding member) that comes into contact with the board or frame material into which the nail is driven protrudes in the direction opposite to the nail pulling direction, and the engaging member fixed to the main body moves relatively in the nail pulling direction, so that the nail can be pulled out by this action. Moreover, in this power tool, the sliding member is slid outside the tool main body, and the engaging member and (the tip of) the sliding member can be relatively separated. In other words, a structure in which the sliding member is slid outside the tool main body in this way is a structure in which it is not necessary to secure the sliding stroke of the sliding member inside the main body, and therefore it can be said that the structure makes it easier to miniaturize the device.

In addition, from the viewpoint of ease of operation and maneuverability, it is important that power tools designed for workers to hold in their hands while performing tasks such as pulling out nails are not only small and lightweight, but also that the distance between the grip part held in the hand and the part where, for example, a nail is hooked (the engaging part of the engaging member) is as close as possible. In this regard, with the power tools described above, it is possible to structure the grip part closer to the main body part, for example by locating the motor on the vertical line of the sliding member (excluding the stroke range), which improves the ease of operation and maneuverability when performing tasks such as engaging the engaging part (such as a hook) with the target of the work (such as a nail).

In addition, the power tool of the above embodiment is configured so that the driving source causes the sliding member to perform a predetermined operation in response to a trigger signal input from the outside, and when the trigger signal is turned on, the sliding member can be slid a predetermined length that has been set in advance. A power tool whose operation is controlled in this way makes it easy to perform tasks such as pulling out nails.

In the power tool of the above embodiment, the sliding member may slide a predetermined length when the trigger signal is turned on and stop at that position.

The power tool of the above embodiment may return the sliding member to its initial position when the trigger signal is turned off.

The electric power tool of the above embodiment may slide the sliding member a predetermined length when the trigger signal is turned on and return it to the initial position.

The initial position of the power tool of the above embodiment may be the position in which the sliding member is most retracted into the main body.

The power tool of the above embodiment may further include a sensor that detects when the sliding member is in the initial position.

The electric power tool of the above embodiment may control the sliding length of the sliding member based on the amount of rotation of the motor as the drive source.

In the power tool of the above embodiment, the amount of rotation of the motor may be preset in the control device.

In the electric power tool of the above embodiment, a number of selectable operating modes may be set to operate the sliding member depending on the type of work to be performed on the work object.

In the electric power tool of the above embodiment, a clamping mode in which the engagement member and the sliding member clamp all or part of the work target may be set as one of the operating modes.

In the power tool of the above embodiment, in the clamp mode, the driving source may be stopped under certain circumstances based on the load acting on the driving source and/or the sliding member.

The power tool of the present invention has a structure that makes it easy to reduce the size of the tool, and its operation is controlled to make it easy to perform tasks such as pulling out nails, making it possible to improve the maneuverability and ease of use of the tool.

FIG. 2 is a perspective view showing a state in which a rechargeable nail puller, which is an example of a power tool, is placed. 1 is a view (front view) of the rechargeable nail puller seen from one direction in an orientation (usage state) in which the hook member is facing straight down. FIG. FIG. 3 is a right side view of the rechargeable nail puller shown in FIG. 2 . FIG. 4 is a top view of the rechargeable nail puller shown in FIG. 3 . FIG. 4 is a bottom view of the rechargeable nail puller shown in FIG. 3 . FIG. 6 is a cross-sectional view of the rechargeable nail puller taken along line VI-VI in FIG. 4 . FIG. 6B is a diagram of the rechargeable nail puller in the same cross section as FIG. 6A with the slider slid. 1 is an oblique view of the rechargeable nail puller with the tip of the slider against a concrete panel. FIG. 7B is an enlarged view of the periphery of the tip of the slider in FIG. 7A. FIG. 7B is a perspective view of the rechargeable nail puller in a state where the slider is slid to the position shown in FIG. 7A . 8B is an enlarged view of the hook member and its periphery in FIG. 8A. FIG. 1 is a diagram showing the internal configuration of a mechanism, such as a hook member and a slider, as viewed from the front. 9B is a cross-sectional view of the hook member, the slider, the ball screw, etc. taken along line IXB-IXB in FIG. 9A. 13 is a side view of the hook member, slider, ball screw, etc. in a state where the slide member has been slid partway with the hook hooked on the nail. FIG. 10B is a vertical cross-sectional view of the hook member, slider, ball screw, etc. shown in FIG. 10A. 1 is a perspective view of the hook member, slider, ball screw, etc., seen from below in a state in which the slider has been slid partway with the hook hooked on the nail. FIG. FIG. 12 is a perspective view of the hook member, slider, ball screw, etc. in FIG. 11 (excluding the cover around the ball screw). FIG. 13 is a perspective view showing a part of the hook member, the slider, the ball screw, etc. shown in FIG. 12 . 14 is a perspective view showing a hook member and a main frame among the members shown in FIG. 13 . FIG. FIG. 14 is a perspective view showing a slider and a ball screw among the members shown in FIG. 13 . 1A is a diagram illustrating a rechargeable nail puller according to an embodiment of the present invention and FIG. 1B is a diagram illustrating a rechargeable nail puller according to a related art, which is one of the advantages of the present invention. 1A and 1B are diagrams illustrating the rechargeable nail puller before the slider is slid and after the slider is slid, which are used to explain miniaturization, one of the advantages of the present invention. 1 is a front view of a hook member, a slider, etc., in a conventional nail puller with a hook hooked on a nail that has been driven in at an angle. FIG. 17B is a cross-sectional view of a hook member, a slider, etc., taken along line XVIIB-XVIIB of the conventional nail puller in FIG. 17A. FIG. 11 is a perspective view showing a hook member, a slider, etc., in a conventional nail puller in a state where the hook is hung on a nail that has been driven in at an angle. 1 is a front view of a hook member, a slider, etc., in a conventional nail puller after the slider has been slid to remove a nail that was driven in obliquely. FIG. FIG. 18B is a cross-sectional view of a hook member, a slider, etc., taken along line XVIIIB-XVIIIB in the conventional nail puller in FIG. 18A. FIG. 11 is a vertical cross-sectional view illustrating a hook member in which a hook portion is disposed at a position offset from a drive shaft. 10 is a vertical cross-sectional view illustrating how a nail is pulled out by a hook member having a hook portion disposed at a position offset from a drive shaft. FIG. 1 is a perspective view showing a rechargeable nail puller with the tip of the slider against a concrete panel and without the cover. FIG. FIG. 20B is a perspective view of the rechargeable nail puller in a state where the slider is slid to the position shown in FIG. 20A . 13 is a perspective view showing a rechargeable nail puller in which the hook has been turned and the tip of the slider is aimed at a concrete panel. FIG. FIG. 21B is a perspective view of the rechargeable nail puller in a state where the slider is slid to the position shown in FIG. 21A . FIG. 1 is a perspective view of a rechargeable nail puller capable of changing the direction of the hook, as viewed from the tip end of the slider. FIG. 22B is a perspective view showing a state in which the orientation of the hook in the rechargeable nail puller shown in FIG. 22A is changed. FIG. 11 is a right side view showing the rechargeable nail puller with the tip of the slider against a concrete panel. FIG. 23B is a vertical cross-sectional view of the rechargeable nail puller shown in FIG. 23A. FIG. 23B is a right side view showing the rechargeable nail puller in a state in which the slider has been slid to the position shown in FIG. 23A . FIG. 24B is a vertical cross-sectional view of the rechargeable nail puller shown in FIG. 24A. FIG. 2 is a vertical cross-sectional view of the rechargeable nail puller as viewed from the front. This figure shows how the pointed part of the attachment is inserted between a concrete panel (plate material) and a crosspiece (frame material) and the part to be struck is struck with a hammer. This is an enlarged view of the attachment portion of the rechargeable nail puller with the pointed portion inserted between a concrete panel (board material) and a crosspiece (frame material). This is an enlarged vertical cross-sectional view showing the attachment portion of the rechargeable nail puller with the pointed portion inserted between a concrete panel (plate material) and a crosspiece (frame material). This is an oblique view showing the state in which the pointed part of the attachment is inserted between a concrete panel (plate material) and a crosspiece (frame material) and the part to be struck is struck with a hammer. This figure shows the state in which the pointed portion is inserted between a concrete panel (plate material) and a crosspiece (frame material) and then the slider is slid to separate the concrete panel and the crosspiece. FIG. 27B is a perspective view of the state shown in FIG. 27A as seen from a different angle. 27B is a view (side view) of the state shown in FIG. 27A from yet another angle. This is a side view showing how the nail foot of a nail that is stuck in a concrete panel is pushed down using a hook and a slider, thereby lifting the nail from the concrete panel. FIG. 28B is a diagram showing a vertical cross section of the rechargeable nail puller shown in FIG. 28A. This is a perspective view from a different angle showing how the foot of a nail that is stuck in a concrete panel (slab) is pushed down using a hook and slider, lifting the nail out of the concrete panel. FIG. 28D is an enlarged view of the rechargeable nail puller shown in FIG. 28C. These figures show, in order, (a) to (d), the process of using a hook and a slider to push down the nail foot of a nail that is stuck in a concrete panel, lifting the nail off the concrete panel, and then removing it. This is an oblique view showing how a frame material (batten) is clamped using the hook and slider of the rechargeable nail puller. This is a view from a different angle showing how the frame material (battens) is clamped using the hook and slider of the rechargeable nail puller. FIG. 1 is a perspective view showing, for reference, a portion of a conventional live nail puller in which a hook is disposed directly below a ball screw. FIG. 1 is a side view showing, for reference, a portion of a conventional live nail puller in which a hook is disposed directly below a ball screw. FIG. 2 is a block diagram showing a configuration example of a control device, an origin sensor, etc. FIG. 11 is a flowchart showing an operation flow of initial position detection (in the case of sensorless). FIG. 13 is a diagram showing an outline of an operation (pattern 1) of initial position detection (in the case of a sensorless system). FIG. 13 is a diagram illustrating an outline of an operation (pattern 2) of initial position detection (in the case of a sensorless system). FIG. 13 is a diagram illustrating an outline of an operation (pattern 3) of initial position detection (in the case of sensorless). FIG. 11 is a flowchart showing an operation flow of initial position detection (when a sensor is present). FIG. 13 is a diagram showing an outline of an operation (pattern 1) of initial position detection (when a sensor is present). FIG. 13 is a diagram showing an outline of an operation (pattern 2) of initial position detection (when a sensor is present). FIG. 13 is a diagram showing an outline of an operation (pattern 3) of initial position detection (when a sensor is present). FIG. 13 is a flow chart of a portion of the nail puller operation flow corresponding to a "nail puller mode." FIG. 13 is a flow chart of a portion of the nail puller operation flow corresponding to a "nail puller one cycle mode." FIG. 13 is a flow chart of the nail puller + clamp operation flow corresponding to the "nail puller mode." FIG. 13 is a flow chart of a portion of the nail puller + clamp operation flow corresponding to a "nail puller one cycle mode." FIG. 11 is a flow chart of the nail puller + clamp operation flow corresponding to the "clamp mode." 11 is a graph showing an example of a current waveform during reverse driving in a clamp mode. FIG. 11 is a flowchart of a portion of the operation flow of nail puller+initial position detection+clamping corresponding to a "nail puller mode." FIG. 13 is a flowchart of a portion of the operation flow of nail pulling + initial position detection + clamping corresponding to a "nail pulling one cycle mode." FIG. 11 is a flowchart of a portion of the nail removal+initial position detection+clamp operation flow corresponding to a "clamp mode."

The following describes an embodiment of the power tool according to the present invention with reference to the drawings.

[First embodiment]
As a first embodiment of the present invention, a case where a power tool is used as a rechargeable nail puller will be described (see FIG. 1, etc.). The rechargeable nail puller 1 is a type of rechargeable power tool used for nail pulling work such as pulling out a nail P that has penetrated a board material or frame material such as a concrete panel Q or a crosspiece R. The rechargeable nail puller 1 of this embodiment is a tool including a main body 10, a hook member 20, a slider 30, a cover 50, a motor 60, etc. (see FIGS. 1 to 19B, etc.), and is configured such that the hook member 20 fixed to the main body 10 is hooked on a nail head Ph, and in this state, the slider 30 is caused to protrude from the main body 10 along the drive shaft DA, and the nail is pulled out in accordance with the movement of the slider 30 (see FIG. 19B, etc.). Below, the configuration of the rechargeable nail puller 1 will be described first, and then the operation of the rechargeable nail puller 1 will be described.

The main body 10 is a part that constitutes the main body of the rechargeable nail puller 1, and in this specification refers to the part excluding the driving part (slider 30, etc.). In this embodiment, the main body 10 mainly consists of a mechanism part 11 that houses the motor 60, etc., a grip part 12 that is held by a user U (only the hand holding the rechargeable nail puller 1 is shown in Figures 7A and 8A) during use, and a battery storage part 13 that houses the battery 66, etc. (see Figures 3 to 5, etc.).

The mechanism 11 is a portion that houses the motor 60 and a drive mechanism (such as a reducer 71 and a screw shaft 72, which will be described later) 70 for transmitting the driving force of the motor 60 to the slider 30 (see FIG. 6B, etc.). This mechanism 11 is further provided with a main frame 14, a cover 50, a hook member 20, etc. (see FIG. 6A, etc.).

The grip section 12 is formed in a shape that connects the battery storage section 13, which is relatively heavy and bulky, and the mechanism section 11, except for the extension line of the drive shaft DA, and is configured as a whole so that when a user holds the grip section 12 to lift and operate the rechargeable nail puller 1, the weight balance is good and it is easy to handle (see Figures 4, 5, etc.). In this embodiment, the grip section 12 is formed to extend in a direction perpendicular to the drive shaft DA, but of course it may be formed to extend in a slightly oblique direction considering the ease of performing nail pulling work, etc. A trigger switch 122 that can be operated by a finger is provided on the part of the grip section 12 near the mechanism section 11 (see Figure 3, etc.). Although a detailed explanation will not be given here, the grip section 12 is formed in a shape and size that is easy to grip, and a flexible member is arranged on the surface, so that it is not slippery and easy to grip.

The battery storage section 13 is a section that stores a rechargeable battery 66 and the like, and is also a section of the main body 10 that is likely to be heavy. In this embodiment, the battery storage section 13 is configured as a housing having a substantially rectangular parallelepiped shape, and has a shape and size that can easily accommodate a large battery 66 (see FIG. 6A, etc.). According to the rechargeable nail puller 1 of this embodiment, which has a built-in rechargeable battery 66, it is possible to perform nail pulling work in a cordless state as a cordless hand tool. In addition, the surface of the battery storage section 13 opposite the grip section 12 is flat, and a rubber pad (not shown) or the like is attached as necessary, and is configured to become a placement surface 13S when the battery storage section 13 is placed in a stable position (placed state) on the ground or floor when not in use (see FIG. 1, FIG. 3, etc.). The battery storage section 13 of this embodiment is further provided with a strap 132 and a belt hook 134 (see FIG. 2, etc.).

Here, the relationship between the description in the drawings and the attitude of the rechargeable nail puller 1 will be mentioned. The attitude (orientation of the rechargeable nail puller 1) when the rechargeable nail puller 1 of this embodiment is actually used for nail pulling work (in-use state) is not particularly limited. For example, if a nail P penetrating a wall surface is to be pulled out horizontally, the hook member 20 and the slider 30 (described in detail in a later section) can be used in a horizontal position as in the placed state, and if a nail P penetrating a ceiling is to be pulled out directly downward, the hook member 20 and the slider 30 can be used in a position facing directly upward. However, in light of the actual situation of use, it is assumed that the operation of pulling out the nail P of a board material or frame material such as a concrete panel Q or a crosspiece R placed at the foot is normally performed directly upward. In this specification and drawings, assuming such a normal scene, the mode in which the hook member 20 and the slider 30 are used in a state facing downward will be described as a representative example of a typical use while calling it a "use state" (see FIG. 2, etc.). For convenience, the upper side in the usage state (the direction that is upward along the drive axis DA) will be called the top, the lower side will be called the bottom, the side where the mechanism unit 11 is located as seen from the user will be called the front, and the side where the battery storage unit 13 is located will be called the rear (see Figure 7A, etc.).

The hook member 20 is a member that functions as a member that engages with a part of the work target (in this embodiment, the head (nail head Ph) of the nail P to be pulled out from a batten, etc.), and has a hook (engagement portion) 22 formed at its tip. The shape of the hook 22 is not particularly limited as long as it can engage with the nail head Ph. In this embodiment, like the tip of a normal nail puller (crowbar), the hook 22 is formed by a pair of symmetrical claws that gradually narrow in width as they move forward when viewed from below (see FIG. 5, etc.). In addition, if the hook 22 is wedge-shaped and gradually becomes thinner as it moves forward when viewed from the side (the left-right direction perpendicular to the front-to-back direction when in use), it is easy to hook it onto the nail head Ph (see FIG. 6B, etc.). The hook member 20 on which the hook 22 is formed is fixed to the main frame 14 of the mechanism unit 11 (see FIG. 11, etc.). In this embodiment, the hook member 20 is formed in a cylindrical shape (see FIG. 14A, etc.), and also functions as a guide member that guides the rod portion 32 of the slider 30 (described later) that slides vertically (see FIG. 13, etc.).

The main frame 14 is a frame formed in the mechanism 11 of the main body 10 so as to extend in the vertical direction (from top to bottom) along the drive axis DA (see FIG. 12, etc.). In this embodiment, a pair of plate-shaped members arranged symmetrically on either side of the drive axis DA is used as the main frame 14 (see FIG. 9A, FIG. 9B, etc.). The upper end of the main frame 14 is attached and fixed to the frame base 15 (see FIG. 13, etc.). The hook member 20 is screwed to the tip portion (lower portion) of the main frame 14 from both sides with fastening screws 24 (see FIG. 14A, etc.). The hook member 20 fixed to the main frame 14 does not change its relative position in the vertical direction (direction along the drive axis DA) in the mechanism 11. The main frame 14 not only plays a role in holding the hook member 20 fixed in this way, but also plays a role as a guide member that guides the slider 30 that slides in the vertical direction.

The slider (sliding member) 30 is a movable member that slides up and down to appear and disappear from the main body 10, and functions like a leg (pusher or push rod) to move a part of it (tip 31) relatively close to and away from the hook 22 of the hook member 20. By projecting the slider 30 with the hook 22 of the hook member 20 engaged with the nail head Ph, the hook 22 of the hook member 20 fixed to the main body 10 and the tip 31 of the slider 30 are relatively separated, and the nail P can be pulled out with this movement (see Figures 7B, 8B, etc.). The slider 30 of the rechargeable nail puller 1 of this embodiment configured in this way can be said to function like a tension rod when pushing up the main body 10 together with the hook 22 against the nailed concrete panel Q or crosspiece R (see Figure 16, etc.).

The specific configuration of the slider 30 is not particularly limited as long as it functions as described above, but in the present embodiment, which is a preferred example, the slider 30 is configured to have an integrated tip portion 31, rod portion 32, and side cover portion 33 that slide vertically along the main frame 14 provided on the main body portion 10 (see FIG. 14B, etc.). The driving force of the motor 60 is transmitted to the slider 30 via a drive mechanism 70 including a screw shaft 72, and the slider 30 moves linearly along the drive axis DA.

The tip portion 31 is formed at the bottom of the slider 30 and is, for example, a substantially circular plate-shaped member, and serves as a bracing portion that abuts against a concrete panel Q or a crosspiece R, thereby pushing up the main body portion 10 relative to the concrete panel Q or a crosspiece R (see Figures 7A, 8A, etc.).

The rod portion 32 is made of a rod-shaped member extending along the drive axis DA, and is integrated with the tip portion 31 at its lower tip (see FIG. 14B, etc.). The rod portion 32 is cylindrical so that the screw shaft 72 passes through its inside (see FIG. 6A, etc.). In addition, a sleeve portion 32c having a female thread 32b that screws with the screw shaft 72 is provided on the inner periphery of a part of the rod portion 32, for example, the upper flange portion 32a, so that the rod portion 32 and the entire slider 30 move linearly along the drive axis DA as the screw shaft 72 rotates (see FIG. 6B, etc.). The screw shaft 72, the female thread 32b, and the steel ball (not shown) interposed between the screw shaft 72 and the female thread 32b constitute a drive mechanism 70 for linearly moving the slider 30, for example, a ball screw (indicated by the symbol 73 in FIG. 9A, etc.) as in this embodiment. The rod portion 32 is formed so that its outer diameter is less than the inner diameter of the hook member 20, is disposed inside the hook member 20, and is guided by the inner peripheral surface of the hook member 20 when sliding (linear motion) (see Figures 10B, 13, etc.). The rod portion 32 is fastened to the side cover portion 33 at its lower end with a screw (flat head cap bolt, etc.) 39 to form an integrated unit (see Figures 10B, 11, etc.).

The side cover portion 33 is made of a member that constitutes the peripheral portion of the slider 30 (see FIG. 14B, etc.). In this embodiment, the side cover portion 33 is provided so as to surround the main frame 14, and further, both side portions of the side cover portion 33 are formed so that their cross-sectional shape is a channel shape, and the main frame 14 is sandwiched in the groove portion (see FIG. 9A, FIG. 9B, etc.). The side cover portion 33 thus formed slides (linearly moves) along the drive axis DA together with the tip portion 31 and the rod portion 32 while being guided by the main frame 14 (see FIG. 12, etc.). A cover 50 is provided around the side cover portion 33.

The cover 50 is a cylindrical member provided on the mechanism 11 so as to cover the periphery of the side cover 33 (see FIG. 6A, etc.). In this embodiment, the cover 50 is provided so as to hide the slider 30 except for the tip 31 when the slider 30 is in the retracted state (initial position) housed in the main body 10 (see FIG. 7B, etc.).

The motor 60 is provided as a power source for driving (linearly moving) the slider 30, which is the movable part, via the drive mechanism 70. In this embodiment, the motor 60 is provided in the main body 10 at an upper position within the mechanism part 11 (see FIG. 6A, etc.).

The drive mechanism 70 is a mechanism configured to transmit the power of the motor 60 to drive (linearly move) the slider 30, which is the movable part. In this embodiment, the drive mechanism 70 includes a reducer 71 and a ball screw 73 (see FIG. 6A, etc.). Although not shown in detail, the reducer 71 includes a gear train that appropriately reduces the rotation speed of the motor 60 and transmits it to the screw shaft 72 of the ball screw 73. The screw shaft 72 is provided along the drive axis DA, and rotates to drive (linearly move) the slider 30.

The control device (control unit) 90 is built into the main body 10 as a device that controls the motor 60. The control device 90 of this embodiment is connected to the motor 60 for two-way communication so as to be able to send and receive control signals, and is also connected to the origin sensor 80, trigger switch 122, mode operation/display unit 92, and battery storage unit 13 (battery 66 stored therein) (see FIG. 31). In addition, although not shown in the figure, the control device 90 also includes a communication circuit for communicating with these, a converter circuit, an inverter circuit, and an MPU for controlling the communication circuit.

As described above, in this embodiment, the screw shaft 72 is provided along the drive axis DA, and the reducer 71 is provided above the screw shaft 72 at a position that is an extension of the drive axis DA. Furthermore, the motor 60 is provided above the reducer 71 at a position that is an extension of the drive axis DA (see FIG. 6A, etc.). As a result, in the rechargeable nail puller 1 of this embodiment, the motor 60 and the drive mechanism 70 (the reducer 71, the ball screw 73 and its screw shaft 72) are configured in series on the same axis. This configuration, combined with the configuration that allows the rechargeable nail puller 1 to have a low overall height, contributes to improving handling and ease of aiming.

That is, firstly, in the rechargeable nail puller 1 of the present embodiment, in which the hook member 20 is fixed instead of being stroked as in the past, and the hook member 20 is moved relatively by stroking the slider 30 instead, there is no need to secure a space inside the main body 10 for stroking the hook member 20. With such a configuration, it is possible to lower the overall height (the length of the mechanism 11 along the drive axis DA) of the rechargeable nail puller 1 in the usage state (however, in the retracted state in which the slider 30 is retracted into the main body 10 and in the initial position) by the length L1 (almost equal to the stroke amount of the hook member 20) corresponding to the internal space required for the stroke of the hook member that would have been secured inside the main body 10 (see Figures 15 and 16, etc. In Figure 15(B), the reference symbol 1' is used to indicate a conventional rechargeable nail puller for comparison). The height of the mechanism 11 in the initial position (retracted state) (the length from the tip 31 to the top of the mechanism 11 along the drive axis DA) is indicated by the symbol L2 (see Figure 16).

Secondly, by making it possible to reduce the overall height as described above, it is now easier to place the motor 60 on the drive shaft DA (or on its extension). For example, the motor 60, which previously had to be offset into the hand grip 12 to avoid an excessively high overall height, can now be placed on the drive shaft DA (or on its extension) in this embodiment, which achieves a reduced overall height. In such a case, it is possible to configure the hand grip 12 closer to the mechanism 11 and the hook 22. If the hand grip 12 is closer to the mechanism 11 and the hook 22 in this way, it contributes to making it easier to handle and aim in the actual nail removal work, especially to making it easier to hook the hook 22 onto the nail head Ph. Moreover, the force acting on the screw shaft 72 acts directly below (coaxially) the screw shaft 72 regardless of the position of the nail P or the direction in which it is inserted, so there is no need to place the hook 22 directly below the drive shaft DA, which also contributes to solving the problem of "it is difficult to aim the nail".

In addition, arranging the motor 60, the reducer 71, and the screw shaft 72 close to each other in a straight line means that the conventional power transmission mechanism (such as a bevel gear) that was arranged between them can be omitted, which makes the structure simpler and contributes to making the device smaller and lighter. In addition, such a rechargeable nail puller 1 is convenient and easy to use even in tight spaces.

In addition, when using a nail puller tool that strikes the nail foot Pt to pull out the nail P, the force of the strike can cause the pulled out nail P to scatter, but with the rechargeable nail puller 1 of this embodiment as described above, it is possible to pull out the nail without scattering it.

In addition, when the main body 10 itself strokes and moves in conjunction with the nail pulling operation, as in the rechargeable nail puller 1 of this embodiment (i.e., moves together with the hook 22 to move away from the concrete panel Q or crosspiece R, etc.) (see Figures 7A to 8B, etc.), there is also the advantage that it is easier for the user to experience the nail pulling operation. In other words, with a conventional structure in which the hook slides within the main body, a user working while holding the rechargeable nail puller in his or her hand can only confirm the nail pulling operation by seeing it with his or her eyes or hearing the sound of it operating, whereas with the rechargeable nail puller 1 of this embodiment, the user can directly feel the movement of the main body 10 itself stroking (rising) in conjunction with the nail pulling operation, and can easily feel that the nail pulling operation has been performed and completed.

[Second embodiment]
As a second embodiment of the present invention, a description will be given of further features of the hook member 20 and the hook 22 of the live nail puller 1. Note that the description of other configurations of the live nail puller 1 that are common to those in the first embodiment will not be repeated.

<Structure to prevent the effects of unbalanced load>
In constructing the rechargeable nail puller 1 as described above, it is preferable to take into consideration the problem of "biased load" acting on the drive shaft. In the case of a conventional structure in which the nail P is pulled out by moving the hook 22', if the nail P penetrates straight into the concrete panel Q or the crosspiece R, the force acting on the drive shaft when the nail P is pulled out acts only in the axial direction, so no biased load (biased load) acts (see Figures 17A and 17B). However, in reality, the nail P often penetrates obliquely (see Figure 17C), and when the nail P is pulled out, the nail pull-out resistance occurs at a position shifted from the drive shaft, which causes a lateral load to act on the drive shaft as a biased load (see Figures 18A and 18B). That is, the resistance when the nail is pulled out occurs at the frictional resistance portion between the nail P and the concrete panel Q or batten R as the driving member, more specifically, the portion of the nail P that penetrates the batten R (the portion with fine dots in FIG. 18B). Therefore, the reason why the offset load acts on the nail P that is driven in obliquely as described above can be explained as the reason that the portion that generates such resistance (the portion of the nail P that penetrates) is misaligned (offset) with respect to the drive shaft. When the offset load acts, the screw shaft 72' is inclined, and as the amount of the nail P pulled out increases, the inclination also increases. As a result, the load acting on the bearing portion of the screw shaft 72' causes uneven wear, and durability decreases. In this way, the offset load occurs due to the misalignment of the drive shaft and the nail, and this may be even more likely if the hook 22 is disposed at a position offset from the drive shaft DA as in this embodiment.
Considering the problem of such uneven load, one possible configuration to suppress or eliminate its effects as much as possible is to place the hook position for hooking the nail head on the drive shaft in the conventional mechanism to prevent uneven load from occurring. However, such an arrangement as in the conventional mechanism, although effective in improving durability, is disadvantageous in that it is difficult to see (aim) the tip of the nail. In addition, it is impossible to avoid the uneven load that occurs when removing a nail that has penetrated at an angle.
In this regard, the present embodiment, which has been made by comprehensively taking into consideration various issues, employs a rigid structure that makes it easy to see (aim) the tip of the nail and is also less susceptible to the effects of uneven loads.
That is, the hook, which is subjected to an unbalanced load in a diagonal or lateral direction, is supported by the main frame 14 having high rigidity, not by a screw shaft for generating a driving force. Also, a guide member is provided to guide the sliding of the slider 30, which is the movable part, to prevent an unbalanced load from acting on the female thread 32b.
This eliminates the need to provide the hook 22 directly below (on an extension of) the drive shaft DA, which allows the position of the hook 22 to be offset, thereby solving the problem of "it being difficult to aim the nail."

<Offset hook placement>
The hook 22 of the hook member 20 is disposed at a position offset from the drive axis DA (see FIG. 10A, etc.). The hook 22 of the hook member 20 of this embodiment is formed to protrude in a direction perpendicular to the drive axis DA and faces horizontally when in use (see FIG. 6A, etc.). The hook 22 is provided so that at least a part of it is outside the cover 50 and can be seen (see FIG. 5, etc.). The advantages of the above-mentioned configuration are as follows. That is, some conventional charging nail pullers have the hook 22' disposed in a position directly below the screw shaft 72' of a ball screw or the like (in other words, on the extension line of the drive axis DA) (see FIG. 30A, FIG. 30B). However, this makes it difficult to see the hook 22' and to grasp its position, which can make it difficult to perform the task of hanging the hook 22' on the nail head Ph. In this regard, according to the rechargeable nail puller 1 in which the hook 22 is offset as in this embodiment, since it is offset from the drive axis DA, the hook 22 is easier for the user to see and the task of hanging the hook 22 on the nail head Ph is easier to perform (see Figures 7A, 7B, etc.).

<Protruding leg at the tip of the slider>
In this embodiment, since the hook 22 is offset as described above, the slider 30, particularly the tip portion 31 thereof, has a structure suitable for the offset arrangement of the hook 22. That is,
(1) The tip 31 of the slider 30 is provided with a protruding leg 35 that protrudes in a direction perpendicular to the drive axis DA (see FIG. 10A, etc.). The protruding leg 35 is formed to a size and shape sufficient to eliminate the effect of an external force (moment) that may act when the nail P is pulled out by the offset-positioned hook 22. As a preferred example, in this embodiment, a pair of protruding legs 35 that are sufficiently protruding compared to the hook 22 (see FIG. 19A, etc.) and are symmetrically arranged on the left and right are provided on the tip 31 (see FIG. 5, etc.). The length from the drive axis DA to the tip of the hook 22 is L4, and the protruding leg 35 is further forward by a length L5 (see FIG. 19B). The pair of protruding legs 35 are arranged at a wider interval than the hook 22 so that the hook 22 of the hook member 20 can be positioned between them (see FIG. 7B, etc.).
(2) The tip 31 of the slider 30 is formed with a flat surface 31f that comes into contact with the concrete panel Q, the crosspiece R, etc. (see FIG. 19A, etc.). This flat surface 31f is at least large enough or shaped to eliminate the effect of an external force (moment) that may act when the nail P is pulled out by the offset hook 22. In this embodiment, the flat surface 31f is formed to extend further forward beyond the offset amount Los of the hook 22 (which in this specification refers to the distance between the imaginary center axis Pc and the drive axis DA when the nail P hung on the hook 22 is assumed to be straight) (in other words, the length L3 from the drive axis DA to the front end of the flat surface 31f is sufficiently longer than the offset amount Los), thereby widening the contact area (ground area) with the concrete panel Q, the crosspiece R, etc. (see FIG. 19B, etc.). It goes without saying that the lower surface of the above-mentioned protruding leg 35 may be entirely or mostly flat.

<Rotating structure of hooks, etc.>
In the case where the hook 22 is offset and protrudes in a direction perpendicular to the drive axis DA as described above, it is preferable to make the hook 22 rotatable (pivotable) around the drive axis DA. This reduces the constraints on the operation of the rechargeable nail puller 1, such as the case where the hook 22 always faces one direction, and makes it possible to further improve ease of use (see Figs. 20A, 20B, etc.). In this embodiment, the rotatable part 21 and the O-ring 26 are provided at the lower tip of the hook member 20, and the orientation of the hook 22 formed on the rotatable part 21 can be changed (see Figs. 21A, 21B, 22A, etc.). The specific configuration of the rotatable part 21 is not particularly limited. As an example, in this embodiment, a ring-shaped rotatable portion 21 having a larger diameter than the cylindrical portion 23 is provided at the lower tip portion of the cylindrical portion (indicated by the symbol 23) of the hook member 20, and the orientation of the hook 22 can be changed by manually rotating this rotatable portion 21 around the drive axis DA (see Figures 22A, 23B, etc.).

The O-ring 26 is an annular member made of, for example, rubber, that is provided between the rotatable portion 21 and the cylindrical portion 23 (see FIG. 23B, etc.). This O-ring 26 functions as a resistor that applies a predetermined resistance to the rotational movement of the rotatable portion 21 around the drive axis DA, and while allowing the relative rotation of the rotatable portion 21, it prevents the rotatable portion 21 from rotating unexpectedly after the orientation of the hook 22 is changed.

In the rechargeable nail puller 1 of this embodiment, the orientation of not only the hook 22 but also the protruding leg 35 of the slider 30 can be changed. For example, in this embodiment, the rod portion 32 and the tip portion 31 of the slider 30 are separated, and a rotatable portion 34 that allows relative rotation and an O-ring 38 are provided between them, so that the tip portion 31, the side cover portion 33, and the protruding leg 35 can rotate (pivot) together relative to the rod portion 32 (see FIG. 24B, etc.). The rotatable portion 34 can be formed, for example, by a screw that rotatably attaches the tip portion 31 to the lower end of the rod portion 32 (see FIG. 24B, etc.).

The O-ring 38 is an annular member made of, for example, rubber, that is provided between the rod portion 32 and the tip portion 31 (see FIG. 24B, etc.). This O-ring 38 functions as a resistor that provides a predetermined resistance to the rotational movement of the tip portion 31 and the like around the drive axis DA, and while allowing relative rotation of the tip portion 31 and the like, it prevents the protruding leg portion 35 and the tip portion 31 from accidentally rotating after the orientation of the protruding leg portion 35 is changed.

In addition, in this embodiment, when the slider 30 is in the initial position retracted into the main body 10, the protruding leg 35 and the hook 22 are formed so that at least a part of them overlap with each other in the axial direction of the drive shaft DA (see FIG. 23B, etc.). In other words, if the protruding leg 35 is rotated in the retracted state (initial position), it will interfere with the hook 22 during the rotation, so in the rechargeable nail puller 1 of this embodiment, if the protruding leg 35 is rotated in the retracted state (initial position), the hook 22 can also be rotated the same amount. For example, if you want to change the direction of the hook 22 depending on the position or state of the nail P, it is easy to do so by turning the protruding leg 35 on the outside, because the direction can be changed simultaneously with the hook 22 (see FIG. 22A, FIG. 22B, etc.). In addition, the fact that the protruding leg 35 and the hook 22 are always facing the same direction also means that the protruding leg 35 is always located directly below the hook 22 when the nail P is pulled out (see FIG. 24A, FIG. 24B, etc.). Therefore, no matter which direction the hook 22 is oriented, the external force (moment) that may act when pulling out the nail P with the offset hook 22 is received by the protruding leg 35 directly below, and the effect of this force can be eliminated.

<Structure that returns the hook and protruding leg to their original orientation>
Furthermore, in this embodiment, even if the orientation of the hook 22 and the protruding leg 35 is changed to perform a nail removal operation, a mechanism is actuated so that the orientation of the hook 22 and the protruding leg 35 returns to the original orientation (facing forward in this embodiment) after the operation (see Figs. 22A, 23A, etc.). Such a mechanism can be constituted, for example, by a device including a guide member that rotates the slider 30 and the rotatable part 21 of the hook member 20 by a predetermined amount so that the hook 22 and the protruding leg 35 face forward while guiding the slider 30 and the rotatable part 21 of the hook member 20 during the period from the state in which the slider 30 is most protruded from the main body part 10 and has removed the nail P (protruding state) (see Figs. 24B, 24C, etc.) to the initial position in which the slider 30 is in the retracted state (see Fig. 23B, etc.) (for example, a device that is formed by a combination of a spiral guide and a protrusion guided along the guide, and that determines the circumferential position of the protruding leg 35 of the slider 30 and the rotatable part 21 of the hook member 20 with the pulling-up sliding operation when the slider 30 returns to the initial position).

<Structure for clamping components>
The main purpose of the rechargeable nail puller 1 equipped with the hook 22 and the protruding leg 35 as described above is, of course, to pull nails, but it can also be used as a clamping device for clamping a member arranged perpendicular to the drive shaft DA. For example, when two concrete panels Q are brought together by clamping the crosspieces of the concrete panels Q so that the concrete panels Q are in contact with each other without any gaps, the crosspieces R can be sandwiched between the lower surface of the hook 22 and the upper surface of the protruding leg 35 (see Figs. 29A and 29B). When used for such purposes, the hook 22 and the protruding leg 35 can be said to function as a holding part that holds the member to be clamped and holds it in that state.

The rechargeable nail puller 1 of this embodiment is a single power tool that can be used for practical purposes other than pulling out nails. This makes it possible to meet the potential demands of the workplace, where having different tools for each task is often considered to be costly and difficult.

[Third embodiment]
As a third embodiment of the present invention, a rechargeable nail puller 1 will be described, which has improved convenience by allowing it to be used for dismantling concrete panels Q, crosspieces R, etc. In this rechargeable nail puller 1, a tapered pointed portion is formed on a part of the slider 30, and by striking the slider 30 with a hammer or the like to drive the pointed portion in, separation work of plate materials or frame materials such as concrete panels Q and crosspieces R can be easily performed (see FIG. 25A, etc.).

<Structure suitable for dismantling plate materials, etc.>
In this embodiment, a tapered portion 36 is formed on a part of the protruding leg portion 35 of the slider 30 (see FIG. 25A, etc.). The tapered portion 36 is a tapered portion formed in a wedge shape so as to face in a direction away from the drive shaft DA. For example, in this embodiment, the tapered portion 36 is formed so as to face in a direction perpendicular to the drive shaft DA on a portion facing forward in the initial position of the retracted state of the rechargeable nail puller 1 (see FIG. 25A, etc.). The shape of the tapered portion 36 is not particularly limited as long as it is tapered, and both the upper surface 36t and the lower surface 36b may be inclined surfaces as in this embodiment (see FIG. 25C, etc.), or only one of them may be an inclined surface and the other surface may be a horizontal surface in a usage state. In addition, the upper surface 36t and the lower surface 36b may be flat surfaces or may be gently curved surfaces. In short, it is sufficient that the slider 30 has a wedge shape that exerts a force to separate plate materials or frame materials such as the concrete panel Q and crosspiece R when the slider 30 is struck to drive the tapered portion 36 into the tapered portion 36 .

In this embodiment, the tapered portions 36 are provided at the front ends of the pair of left and right protruding leg portions 35, and are formed symmetrically about an imaginary plane (indicated by symbol VP in FIG. 4) including the drive shaft DA.
Furthermore, the left and right tapered portions 36 are spaced apart so that the hooks of the hook members 20 can be accommodated therebetween (see FIG. 7B, etc.).

The slider 30 has a struck portion 37 formed on the side opposite the tapered portion 36 when the drive axis DA is used as a reference (the rear side when in use) (see FIG. 25B, etc.). In this embodiment, the struck portion 37 is shaped to protrude toward the side opposite the tapered portion 36 when the drive axis DA is used as a reference, so that the user can easily see the location to be struck with the hammer 300 and the hammer 300 is prevented from striking the cover 50 of the rechargeable nail puller 1 when striking (see FIG. 26, etc.). Taking the latter point into consideration in particular, the slider 30 may be formed so that the struck portion 37 protrudes sufficiently beyond the surface of the cover 50 (see FIG. 25C, etc.).

At least the portion of the slider 30 that is used for the impact operation (including the tapered portion 36 and the impacted portion 37) is made of a material that has enough rigidity to withstand impact. This portion may be made of metal, such as a casting. Alternatively, this portion may be made of a removable attachment (indicated by the reference symbol 40 in FIG. 25B). When a removable attachment 40 including the tapered portion 36 and the impacted portion 37 is used, the tapered portion 36 and the impacted portion 37 can be easily replaced even if they are damaged. The entire attachment 40 may be made of metal, such as a casting. The attachment 40 may be provided to the rod portion 32 of the slider 30, etc., so as to be rotatable around the drive axis DA.

In this embodiment, the tapered portion 36 formed on the slider 30 as described above is sized so that its tip 36a is positioned outside the hook 22 of the hook member 20 (in other words, it is positioned farther from the drive axis DA), and the outline of the tapered portion 36 is laid out outside the outline of the hook 22 (in other words, the hook 22 is hidden within the projection plane of the protruding leg 35 or its tapered portion 36 when viewed from the side) (see FIG. 25C, etc.). In this way, by forming the tapered portion 36 larger than the hook 22 and positioning it forward, it is possible to avoid the hook 22 acting as a resistance when inserting the tapered portion 36 into the gap between the concrete panel Q and the crosspiece R, for example.

According to the above-mentioned rechargeable nail puller 1, the taper portion 36 is inserted into the gap between the concrete panel Q and the crosspiece R, and the striking portion 37 is struck with the hammer 300, so that the striking force can be used to widen the gap between the concrete panel Q and the crosspiece R, just as if using a crowbar (see FIG. 26, etc.). In this way, if the hook 22 and the protruding leg portion 35 are deeply inserted and the slider 30 is slid, the gap between the concrete panel Q and the crosspiece R can be further widened to make them easier to separate (see FIG. 27A, FIG. 27B, FIG. 27C, etc.). In addition, if the nail head Ph is slightly floating from the concrete panel Q or the crosspiece R, but is firmly inserted, making it difficult to hook the hook 22 onto the nail head Ph, it is possible to strike the striking portion 37 with the hammer 300 in that state, gradually pushing the hook member 20 forward, and bringing the hook 22 into a state of sufficient engagement with the nail head Ph.

<How to use it to lift nails from boards, etc.>
The rechargeable nail puller 1 having the configuration described above can also be used to lift up a nail P that has been inserted into a board or frame material such as a concrete panel Q or a crosspiece R (see Figure 28A, etc.).

In most cases, the nail P driven in the formwork panel work is driven with the nail head Ph raised, considering the dismantling to be performed after the concrete has hardened. However, there may be cases where the raised width is not sufficient and it is difficult to hook the hook 22, so it is convenient to raise such a nail P even further. In this case, the nail P can be raised even further using the rechargeable nail puller 1. Specifically, for example, when the nail P remains stuck in the concrete panel Q separated from the crosspiece (see FIG. 28E (a)), first, the pressing tool 400 is provided in advance between the pair of left and right hooks 22, and the protruding leg 35 is placed against the surface of the concrete panel Q (the surface with the nail head Ph) in the protruding state by sliding the slider 30, and the nail foot Pt is pressed down with the pressing tool 400 (see FIG. 28A, FIG. 28B, FIG. 28C, FIG. 28D, FIG. 28E (b)). When the nail head Ph floats above the surface of the concrete panel Q (see FIG. 28E(c)), the nail P can be pulled out with the rechargeable nail puller 1 (see FIG. 28E(d)), which may allow for smooth and efficient work. The push-down tool 400 can be anything that can push down the tip of the nail foot Pt, and a jig that can be attached and detached to the hook 22 can be used.

The rechargeable nail puller 1 of this embodiment allows for practical uses other than pulling out nails, despite being a single power tool. This also makes it possible to meet the potential demands of on-site workers, who tend to think that having different tools for each task is costly and difficult.

[Fourth embodiment]
As a fourth embodiment of the present invention, various operations of the rechargeable nail puller 1 and their control will be described (see Figs. 31, 32A, etc.).

<Control device>
The control device 90 causes the motor (drive source) 60 to perform a predetermined operation on the slider (sliding member) 30 in response to a trigger signal input from the outside.

<Origin sensor>
The origin sensor 80 is provided as a means for detecting that the slider 30 is at an initial position. The origin sensor 80 may be an optical sensor that detects the position of the slider 30 on the drive axis DA. Alternatively, the origin sensor 80 may be a sensor that grasps the position or amount of movement of the slider 30 based on the amount of rotation of the motor 60. Alternatively, the origin sensor 80 may be composed of a switch that is arranged to detect that the slider 30 is at a predetermined position when it comes into contact with the slider 30.

<Operation mode>
The rechargeable nail puller 1 of this embodiment has a plurality of selectable operation modes for operating the slider 30 depending on the content of the work on the work target. The operation modes are various operation methods set so that the user can select from the manner in which the rechargeable nail puller 1 moves when pulling out nails, or in accordance with the state or desired operation when used for purposes other than pulling out nails. The rechargeable nail puller 1 of this embodiment has a "nail pull mode," a "nail pull one cycle mode," and a "clamp mode" that the user can select by operating a mode operation/display unit (indicated by reference symbol 92 in FIG. 31 ) for operating the modes.

<Nail removal operation flow>
An example of an operation flow when controlling the nail pulling operation in the rechargeable nail puller 1 will be described (see Figs. 34 and 35).

After the main power is turned on (step SP301), an operation mode is selected (step SP303). As operation modes for nail pulling applications, a "nail pull mode" and a "nail pull one cycle mode" are set, which can be selected by the user by operating a mode selection switch (not shown) so that the user can select the way the rechargeable nail puller 1 moves when pulling nails according to the type of nail pulling to be performed or the desired operation.

<Nail removal operation flow (nail removal mode)>
When the "nail pull mode" is selected in step SP303, the operation of driving to the initial position is performed first (step SP311). This is a series of automatic operations for detecting the position of the drive part of the slider 30 and moving the position of the slider 30 to a predetermined initial position, as described above. When a mode change is instructed, the slider 30 moves to an initial position that differs for each mode, but if there is no mode change, this step may be skipped.

After the initial position drive operation (step SP311), the setting of the movement amount is reflected (step SP312). This step is for appropriately setting the movement amount (sliding length) of the slider 30 during the nail removal operation to be performed, and may be provided so that it can be switched by operating a switch (not shown) that can be operated or input by the user. When a switch is used, the switch may be any type, such as a tact switch or a dial switch. Although a detailed explanation is omitted, it may be possible to select "auto" which automatically sets the movement amount, or "standard" which sets a standard movement amount. The movement amount (sliding length) of the slider 30 may be controlled based on the rotation amount of the motor (e.g., a stepping motor) 60. In this case, the rotation amount of the motor 60 may be set in advance in the control device.

While the trigger OFF signal is being input, SP303, SP311, SP312, and SP313 are continuously executed, and when the trigger is ON, the nail removal operation starts (step SP314).

In the nail pulling operation step, the motor 60 is driven in the forward direction to move the slider 30 in the direction protruding from the main body 10 (i.e., the nail pulling operation direction described above) (step SP314). When the movement amount of the slider 30 reaches the preset movement amount (step SP312) (step SP315), the motor 60 is stopped to stop the driving of the slider 30 (step SP316). When the driving of the slider 30 is stopped, the system waits until the trigger is turned OFF (step SP317). That is, the system waits until the trigger switch 122 is released from the state where the trigger switch 122 is pulled by the user's finger (trigger ON state) (or the force pulling the switch is relaxed) and the trigger switch 122 returns to its original state (trigger OFF state), and when the trigger signal is turned OFF (i.e., when the trigger is OFF), the motor 60 is rotated in the reverse direction to move the slider 30 in the direction to return to the initial position (the direction to be pulled into the main body 10) (step SP318). When the slider 30 returns and reaches the initial position (step SP319), the motor 60 and the slider 30 are stopped (step SP320), and the series of operations (nail removal mode) is terminated. After the series of operations is completed, the process returns to step SP303 to prepare for the next nail removal operation, and performs the same operation as described above in response to the input (see FIG. 34). As described above, in the nail removal mode, the slider 30 is caused to perform a predetermined operation in response to a trigger signal input from the outside, such as sliding the slider 30 a predetermined length when the trigger signal is turned on.

<Nail removal operation flow (nail removal 1 cycle mode)>
The operation flow when the "nail pulling one cycle mode" is selected in step SP303 will be described (see FIG. 35, etc.). In the "nail pulling one cycle mode", the operation of driving to the initial position is performed (step SP321), and then the operations of setting the amount of movement (step SP322), waiting for the trigger to be ON (step SP323), performing the nail pulling operation (step SP324), reaching the set amount of movement (step SP325), and stopping the drive (step SP326) are performed in this order (see FIG. 35). Each operation up to this point is the same as that in steps SP311 to SP316 in the "nail pulling mode" described above (see FIGS. 34 and 35).

After this, in the nail pull one-cycle mode, regardless of the state of the trigger switch 122 (trigger ON or trigger OFF), the motor 60 is rotated in the reverse direction to move the slider 30 back to its initial position (step SP327), and the slider 30 is not held in the protruding state. When the slider 30 returns and reaches its initial position (step SP328), the driving of the motor 60 and the slider 30 is stopped (step SP329). After the driving is stopped, the system waits until the trigger is turned OFF (step SP330), and when the trigger switch 122 has returned from the state in which it is pulled by the user's finger (trigger ON state) to the original state (trigger OFF state), the system returns to step SP303 and prepares for the next nail pull operation (see Figures 34 and 35). As described above, in the nail pull one-cycle mode, when the trigger signal is turned ON, the slider 30 is slid a predetermined length set in advance, and then the slider 30 is returned to its initial position.

<Nail puller + clamp operation flow>
The rechargeable nail puller 1 may be configured to perform a clamping operation in addition to a nail pulling operation. An example of an operation flow in such a case where both the nail pulling operation and the clamping operation can be performed will be described (see Figs. 36A to 36C).

After the main power is turned on (step SP501), one of the operation modes is selected from "nail pull mode", "nail pull one cycle mode", and "clamp mode" (step SP503). When "nail pull mode" is selected, the operation flow (steps SP511 to SP520, see FIG. 36A) is the same as that in the above-mentioned "nail pull mode" (see FIG. 34), and when "nail pull one cycle mode" is selected, the operation flow (steps SP521 to SP530, see FIG. 36B) is the same as that in the above-mentioned "nail pull one cycle mode" (see FIG. 35), so they will not be described here. An example of the operation flow when "clamp mode" is selected is described below (see FIG. 36C).

<Clamp operation flow (clamp mode)>
If the "clamp mode" is selected in step SP503, the motor 60 is driven in the forward direction to drive the slider 30 to the position where it is most protruded from the main body 10 (hereinafter also referred to as the "maximum extension position") (step SP531), and waits until the trigger switch 122 is pulled and a "trigger ON" signal is transmitted (step SP532). When the trigger is ON, the motor 60 is rotated in the reverse direction to start a clamping operation (an operation in which a work object such as a pair of crosspieces of a concrete panel Q is sandwiched between the hook 22 and the protruding leg 35) (step SP533). After the clamping operation is started, if a predetermined load (clamp load) is generated before the slider 30 reaches the initial position (NO in step SP534, YES in step SP535), the driving of the motor 60 and the slider 30 is stopped at that point (step SP536), and the work object is kept clamped while waiting until the trigger is OFF (step SP537). That is, the system waits until the trigger switch 122 is released from the state where the user's finger is pulled (trigger ON state) (or the force pulling the switch is relaxed) and the trigger switch 122 returns to the original state (trigger OFF state), and when the trigger switch 122 is in the trigger OFF state, the system waits until the trigger switch 122 is pulled to return to the trigger ON state (step SP538). When the trigger is ON, the motor 60 is rotated forward again to drive the slider 30 to return to the maximum extension position (step SP540). When the slider 30 reaches the maximum extension position (step SP541), the drive of the motor 60 and the slider 30 is stopped (step SP542). Thereafter, the system waits until the trigger is in the OFF state (step SP543), and when the trigger is in the OFF state, the system returns to the step of selecting the operation mode (step SP503).

Also, if the slider 30 reaches the initial position in step SP534 (YES in step SP534), it is determined that the work object, etc. was not clamped while the slider 30 moved from the maximum extension position to the initial position, and the process transitions to step SP539 and the drive is stopped (see FIG. 36C).

The load acting on the slider 30 and the motor 60 during the operation of the slider 30 can be detected based on the current value of the motor 60. For reference, an example of the current waveform of the motor 60 when the motor 60 is driven in the clamp mode in the reverse direction is shown here (see FIG. 37). The current value when the work object is clamped is greater than the current value when the motor 60 is driven in the reverse direction in the nail pull mode (specifically, when the slider 30 is returned to the initial position after the nail pull operation (step SP518) (see FIG. 36A)). Therefore, when the threshold current C1 during reverse drive in the nail pull mode is set, by setting a value C2 greater than the current C1 as the threshold current during reverse drive in the clamp mode, it is possible to detect the completion of the clamp operation based on the threshold current C2 (see FIG. 37).

<Operation flow for initial position detection (sensorless)>
Next, an operation flow for positioning the slider 30 and the like to the initial position in accordance with a trigger signal in the rechargeable nail puller 1 will be described. Here, three types of patterns will be described for the rechargeable nail puller 1 that is sensorless, i.e., has no sensor for detecting the position of the slider 30: pattern 1 in which there is no room for a member to be pinched, pattern 2 in which there is room for a member to be pinched and the operation ends normally, and pattern 3 in which a member is pinched and the operation ends abnormally (see Figs. 32A to 32D). Note that the flow showing the operation of each of the three types of patterns 1 to 3 is as shown in Fig. 32A. Also, in Figs. 32B to 32D, any part of the slider 30 is designated as the "operating part," and the part is indicated by a hollow triangle symbol to show the movement and amount of the slider 30. Note that the sliding movement of the slider 30 (toward the bottom of the rechargeable nail puller 1) relative to the main body 10 of the rechargeable nail puller 1 (see Fig. 7B, etc.) is represented as a movement to the right (the nail pulling operation direction) in Figs. 32B to 32D. Furthermore, parts that are related between the operations in the flow (see FIG. 32A) and the operations in each pattern (see FIGS. 32B to 32D) are given the same numbers in parentheses.

<Operation flow for initial position detection (sensorless) (Pattern 1)>
In the rechargeable nail puller 1, when the main power is turned on (step SP101), this serves as an initial trigger to start the operation flow for detecting the initial position of the slider 30 (see Figs. 32A and 32B). When the trigger signal is turned on in this manner to start the flow, first, the motor 60 is driven in the reverse direction (step SP110), and it is determined whether or not a high load (a high load exceeding a predetermined value) is detected when the slider 30 hits a position where it cannot slide any further (hereinafter referred to as the "reverse rotation limit position") (step SP111). If a high load is detected (YES in step SP111), the motor 60 is driven in the forward direction (step SP141), and it is determined whether or not the slider 30 has moved a predetermined amount equivalent to the initial position setting specified amount _X0 (step SP142).

Here, the "specified amount _X0 for initial position setting" refers to an amount equivalent to the difference between the "target initial position _W0 " where the slider 30 should be located at the beginning of the operation and the above-mentioned "reverse limit position _W1 " (see FIG. 32B). In this embodiment, the slider 30 is once pulled back to the reverse limit position _W1 , and then slid a predetermined length equivalent to the specified amount _X0 for initial position setting to position the slider 30 at the target initial position _W0 (positioning the slider 30). Specifically, when it is detected that the slider 30 has moved from the "reverse limit position _W1 " by the "specified amount _X0 for initial position setting" (YES in step SP142), it is determined that the slider 30 has reached the "target initial position _W0 ", and the motor 60 is stopped (step SP143), a series of initial position detection operations is completed (step SP144), and the process shifts to normal control (control associated with operations such as nail pulling) (step SP150).

<Operation flow of initial position detection (sensorless case) (Pattern 2)>
In the following Pattern 2, an operation flow will be described in which there is a possibility that some member may be pinched during the movement of the slider 30 associated with the detection of the initial position (see FIGS. 32A, 32C, etc.).

The process from step SP101 to step SP111 is the same as that of pattern 1 (see FIG. 32A). In step SP111, if "a high load is not detected when the slider 30 hits the reverse rotation limit position _W1" (NO in step SP111), it is determined whether the operating unit has moved a specified amount _X1 (whether the operating unit has entered the main body unit 10) (step SP121). The specified amount _X1 here is different from the above-mentioned initial position setting specified amount _X0 . Until the movement amount of the operating unit reaches this specified amount _X1 , the flow of returning to step SP111 is repeated (NO in step SP121). When the movement amount of the operating unit reaches the specified amount _X1 (YES in step SP121), the motor 60 is rotated forward (step SP122), and the slider 30 is moved in the direction protruding from the main body unit 10, and it is determined whether a high load is detected at the forward rotation limit position _W2 (step SP123). The forward rotation limit position _W2 here is a position where the slider 30 cannot slide any further in the protruding direction (see FIG. 32C) and is the end of the possible stroke width of the slider 30. Here, the process waits until a high load exceeding a predetermined value is detected, and if detected, it is determined that the slider 30 has reached the forward rotation limit position _W2 and proceeds to step SP124 (see FIG. 32A).

In step SP124, the motor 60 is rotated in the reverse direction to move the slider 30 in the direction in which it is pulled into the main body 10. After that, it is determined whether or not a high load is detected at the reverse limit position _W1 (step SP125). Here, it waits until a high load exceeding a predetermined value is detected, and if it is detected, it is determined that the slider 30 has reached the reverse limit position _W1 .

Next, it is determined whether the slider 30 has moved by the abnormality prevention specified amount _Xap or more (step SP126). The abnormality prevention specified amount _Xap is an amount set as an index for determining that no abnormality such as the slider 30 getting caught on something or getting a foreign object caught in the middle of the movement of the slider 30 (in the case of this embodiment, the slider 30 moves from the forward rotation limit position _W2 to the reverse rotation limit position _W1 ), and is set as an amount that occupies a predetermined percentage of the possible stroke width of the slider 30 (see FIG. 32C). If the slider 30 has moved by the abnormality prevention specified amount Xap _or more in this step SP126, it is determined that no abnormality has been confirmed in the series of operations up to this point, and the process proceeds to the above-mentioned step SP141. After step SP141, the same operations as those of the above-mentioned pattern 1 are performed (steps SP141 to SP144, step SP150). On the other hand, if the slider 30 has not moved by the abnormality prevention specified amount Xap _or more in step SP126, the process proceeds to step SP131 (see FIG. 32A). Step SP131 will be described in the following pattern 3.

<Operation flow of initial position detection (sensorless case) (Pattern 3)>
In the following pattern 3, the flow will be mainly described in the case where the slider 30 does not move by the abnormality prevention specified amount Xap _{or more} in the above-mentioned step SP126 (see FIG. 32A, FIG. 32D, etc.). If the slider 30 does not move by the abnormality prevention specified amount Xap _or more in this step SP126, it is determined that an abnormal lock has occurred due to an event such as the slider 30 getting caught on something or a foreign object being caught while moving from the forward rotation limit position _W2 to the reverse rotation limit position _W1 (step SP131). In this case, the operation flow of the initial position detection is ended. Also, the occurrence of the abnormal lock may be notified to the user by turning on a lamp provided on the main body 10 of the rechargeable nail puller 1 or sounding a buzzer.

<Operation flow for initial position detection (with sensor)>
Next, another embodiment of the operation flow for positioning the slider 30 and the like to the initial position in response to a trigger signal in the rechargeable nail puller 1 will be described. Three types of patterns will be described below in the rechargeable nail puller 1 equipped with a position detection sensor: pattern 1, in which detection starts when "operating part position < origin _{position W op "} , pattern 2, in which detection starts when "origin position W _op < operating part position ", and pattern 3, in which detection starts when "operating part position = origin position W op " (see Figs. 33A to 33D). Note that the flow showing the operations of each of the three types of patterns 1 to 3 is as shown in Fig. 33A. The "operating part" is as described in the above embodiment. Also, the "origin position" here refers to the position or range where the "operating part" should be when the slider 30 is in the initial position. In this embodiment, the position is detected using a sensor (for example, an origin sensor indicated by reference numeral 80 in Fig. 31) that detects whether the operating part is at the origin position W _op or not as the detection sensor. Although there is no limitation on specific examples of what is expected to be used as the detection sensor, one example is a non-contact Hall IC that detects a magnet attached to the slider 30.

When the main power supply is turned on in the rechargeable nail puller 1 (step SP201), this serves as the initial trigger to start the operation flow for detecting the initial position of the slider 30 (see Figures 33A and 33B). When the trigger signal is turned on in this way and the flow starts, the state of the origin sensor is checked to determine whether the origin sensor has detected the operating part of the slider 30 or is not in a detecting state (step SP203). If it is in a not detecting state, the operation flow first proceeds according to pattern 1 (see Figure 33A).

<Operation flow for initial position detection (with sensor) (Pattern 1)>
In pattern 1, first, the motor 60 is driven in the forward direction (step SP211) to move the slider 30 in the direction protruding from the main body 10 (the nail pulling operation direction) (see FIG. 33A). After that, the process waits to see whether the origin sensor detects the operating part (step SP212). If it does, the process proceeds to step SP213. On the other hand, if the operating part of the slider 30 has moved a specified amount without being detected, the process proceeds according to the operation flow of pattern 2 described later.

When the origin sensor detects the operating part (step SP212), the operation waits until the origin sensor does not detect the operating part (step SP213). When the slider 30 is moved to the non-detecting state, it is determined that the slider 30 has moved past the origin position W _op (see FIG. 33B), and at this point, the motor 60 is rotated in the reverse direction (step SP214) to move the slider 30 in the direction of pulling back. After that, when the origin sensor detects the operating part (step SP215), it is determined that the operating part that has passed the origin position W _op has returned to the origin position W _op again, and in this embodiment, the motor 60 is stopped once (step SP241), and in that state, a series of initial position detection operations are completed (step SP242), and the operation transitions to normal control (control associated with operations such as nail removal) (step SP250).

<Operation flow for initial position detection (with sensor) (Pattern 2)>
The above pattern 1 corresponds to the case where "operating part position < origin position W _op " (the origin position W _op is located in the direction of the nail pulling-out operation more than the operating part) at the time when the main power is turned on (initial trigger), but if it is discovered midway through the operation flow that the opposite is actually true "origin position W _op < operating part position " (the operating part is located in the direction of the nail pulling-out operation more than the origin position W _op ) at the time of the initial trigger, then the operation flow of pattern 2 described below will proceed (see Figures 33A and 33C).

That is, after driving the motor in the forward direction (step SP211), in step SP212 where it is waited whether the origin sensor detects the operating part, if the operating part of the slider 30 moves a specified amount _X2 without being detected (see FIG. 33C), the motor 60 is rotated in the reverse direction (step SP222) to move the slider 30 in the direction to pull back. After that, when the origin sensor detects the operating part (step SP223), it is determined that the operating part, which was originally "origin position W _op < operating part position", is now located at origin position W _op , and the motor 60 is stopped (step SP241), a series of initial position detection operations is completed (step SP242), and the process transitions to normal control (step SP250).

<Operation flow for initial position detection (with sensor) (Pattern 3)>
After the main power is turned on (step SP201), when the origin sensor detects the working part of the slider 30 ("working part position = origin position W _op ") (step SP203), the operation flow proceeds according to pattern 3 (see Figures 33A and 33D). In pattern 3, the motor 60 is first driven in the forward direction (step SP231) to move the slider 30 in the direction protruding from the main body 10 (nail pulling operation direction), and the operation waits until the origin sensor becomes non-detecting (step SP232). When the non-detecting state is reached, the motor 60 is rotated in the reverse direction (step SP233) to move the slider 30 in the direction of pulling back. Thereafter, the operation waits until the origin sensor detects the working part (step SP234). When the origin sensor detects the moving part, it determines that the moving part, which has passed the origin position W _op , has returned to the origin position W _op again, and stops the motor 60 (step SP241), and then completes the series of initial position detection operations in that state (step SP242), and transitions to normal control (step SP250).

<Nail removal + initial position detection + clamp operation flow>
An initial position detection operation after the trigger is turned ON may be added to the above-mentioned nail puller + clamp operation. An example of the operation flow in this case will be described (see Figs. 38A to 38C). Note that the following description will focus on the differences from the above-mentioned nail puller + clamp operation flow (see Figs. 36A to 36C).

In this operation flow, after the main power is turned on (step SP601), the initial position of the slider 30 is detected (step SP602). In the case of a sensorless system, the initial position is detected as in the above-mentioned "Operation flow for initial position detection (sensorless)" (see Figures 32A to 32D), and in the case of a sensor, the initial position is detected as in the above-mentioned "Operation flow for initial position detection (with sensor)" (see Figures 33A to 33D). Thereafter, the nail pull operation or clamp operation is performed (see Figures 38A to 38C) as in the above-mentioned "Operation flow for nail pull + clamp" (see Figures 36A to 36C).

The above embodiment is one example of a preferred embodiment of the present invention, but is not limited thereto and various modifications can be made without departing from the scope of the present invention. For example, in the above embodiment, a structure in which the hook member 20 (the hook 22) is moved relatively by sliding only the slider 30 (a structure in which the hook 22 is fixed relatively to the main body 10) has been described, but a structure in which both the slider 30 and the hook member 20 are moved simultaneously may also be used. Although not specifically shown here, for example, a rack and pinion mechanism may be used to link the slider 30 and the hook member 20, or a linking mechanism that links the slider 30 to the protruding movement of the slider 30 may be used to slide the hook member 20 in the opposite direction.

In the above embodiment, the rechargeable nail puller 1 using the motor 60 as the drive source has been described (see FIG. 6B, etc.), but this is merely one example of a suitable configuration. Although not specifically illustrated, in addition to an electric nail puller using a motor as the drive source, various power nail pullers such as compressed air nail pullers using an air motor and hydraulic nail pullers using a hydraulic motor, or various electric tools using an AC electric motor as the drive source can be configured. Alternatively, the slider 30 may be driven by an air cylinder, or a drive mechanism 70 using a trapezoidal screw instead of the ball screw 73 may be configured. Alternatively, a rack and pinion, worm gear, or the like may be used to convert the rotation of the motor 60 into linear motion.

The present invention is suitable for use in various power tools, including electric nail pullers.

1...Chargeable nail puller (power tool)
10: Main body portion 11: Mechanical portion 12: Hand grip (grip portion)
13: Battery storage section 13S: Placing surface 14: Main frame (guide member)
15...Frame base 20...Hook member (engagement member, guide member)
21...Rotary portion of hook member (rotary portion of engagement member)
22...Hook (engagement portion)
22'... hook 23... cylindrical portion 24... fastening screw 26... O-ring (resistor)
30...Slider (sliding member)
31: Tip of slider (tip of sliding member)
31f...flat surface 32...rod portion of slider 32a...flange portion 32b...internal thread 32c...sleeve portion 33...side cover portion of slider 34...rotatable portion of slider (rotatable portion of sliding member)
35: Protruding leg portion (holding portion) of slider
36...Tapered portion (pointed portion) of protruding leg of slider
36a...Tip of tapered portion (tip of pointed portion)
36b: Lower surface of tapered portion 36t: Upper surface of tapered portion 37: Struck portion 38: O-ring (resistance body)
40: Slider attachment 50: Cover 60: Motor (drive source)
66: Battery 70: Drive mechanism 71: Speed reducer (part of the drive mechanism)
72...Screw shaft 72'...Screw shaft 73...Ball screw (part of the drive mechanism)
80...Origin sensor (sensor for detecting the position of the slider)
90...Control device 92...Mode operation/display unit 122...Trigger switch 132...Strap 134...Belt hook 300...Hammer 400...Pressing device C1...Threshold current during reverse drive in nail pull mode C2...Threshold current during reverse drive in clamp mode DA...Drive shaft L1...Length equivalent to internal space required for stroke of hook member Los...Offset amount of hook L2...Height of mechanism in initial position (retracted state) L3...Length from drive shaft DA to front end of flat surface L4...Horizontal length from drive shaft DA to hook tip L5...Horizontal length from hook tip to tip of protruding leg P...Nail (work object)
Pc: Virtual central axis when nail P is assumed to be straight Ph: nail head Pt: nail foot Q: concrete panel (work object)
R… Crosspiece (work object)
U... (user, etc.) user VP... Virtual plane including the drive shaft W ₀ ... Target initial position W ₁ ... Reverse limit position W ₂ ... Forward limit position W _op ... Origin position X ₀ ... Initial position setting specified amount X ₁ ... Specified amount X ₂ ... Specified amount X _ap ... Abnormality prevention specified amount

Claims (9)

An electric tool used for tasks such as nail removal,
A main body portion,
An engagement member provided on the main body portion and having an engagement portion that engages with a part of a work target;
a sliding member that moves in and out of the main body portion to move a part of the sliding member toward and away from the engaging member;
A drive source for operating the sliding member;
a control device that causes the driving source to perform a predetermined operation on the sliding member in response to a trigger signal input from an external device;
Equipped with
A plurality of selectable operation modes are set for operating the sliding member according to the content of the work on the work object,
As one of the operation modes, a clamp mode is set in which the engaging member and the sliding member clamp all or a part of a work target,
When the trigger signal is turned on, the sliding member is caused to slide a predetermined length. The power tool according to claim 1, in which the sliding member is caused to slide a predetermined length when the trigger signal is turned on and stopped at that position. The power tool according to claim 1 or 2, in which the sliding member is returned to its initial position when the trigger signal is turned off. The power tool according to claim 1, in which the sliding member is slid a predetermined length when the trigger signal is turned on and returned to the initial position. The power tool according to claim 3 or 4, wherein the initial position is a position in which the sliding member is most retracted into the main body. The power tool according to claim 5, further comprising a sensor that detects when the sliding member is in the initial position. The power tool according to any one of claims 1 to 6, in which the sliding length of the sliding member is controlled based on the amount of rotation of the motor serving as the drive source. The power tool according to claim 7, wherein the amount of rotation of the motor is preset in the control device. The power tool according to claim 1 , wherein, in the clamp mode, driving by the driving source is stopped under a predetermined condition based on a load acting on the driving source and/or the sliding member.

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