JP3626845B2 - Electric tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of an electric tool that performs forward / reverse switching of a rotating body by rotating a switching lever provided in a main body.
[0002]
[Prior art]
Conventionally, as this type of electric tool, as shown in FIG. 6, the main body 51 having a rotating body (not shown) for holding and rotating the tool on the front side is switched between forward and reverse rotation of the rotating body. A switching lever 52 is provided so as to be rotatable about a point Q of the base end portion 53, and a trigger 54 for operating rotation and stop of the rotating body is provided below the switching lever 52. 51 is provided so as to be able to advance and retreat.
[0003]
The switching lever 52 includes a lever main body 55 having a base end portion 53 pivotally supported by the main body 51 and an operating portion 56 provided at the distal end of the lever main body 55 and protruding downward. The main body 55 is accommodated in the main body 51 at the base end 53 side, and the lever main body 55 is exposed by projecting from the opening 51 a of the main body 51, most of the lever main body 55 side.
[0004]
Further, the rotation range of the switching lever 52 is restricted by both side edges of the opening 51a of the main body 51, and the bending in the direction intersecting the turning direction is also restricted by the upper and lower edges of the opening 51a.
[0005]
In such a power tool, when the switching lever 52 is rotated forward and the trigger 54 is pressed with the finger 20 while the body 51 is held and held, the motor (not shown) is energized to rotate the rotating body, When the switching lever 52 is rotated to the opposite reverse side, the rotating body rotates backward, and when the trigger 54 is released, the rotating body stops.
[0006]
[Problems to be solved by the invention]
However, the conventional power tool has the following problems.
First of all, most of the switching lever 52 protrudes from the main body 51 and is exposed, and because the distance from the opening 51a of the main body 51 to the operation unit 56 is long, the switching lever 52 is accidentally applied to the work table. At this time, when an impact force is applied to the exposed portion of the switching lever 52 from the main body 51, particularly the operation portion 56 protruding downward, the rotation range of the switching lever 52 and the direction intersecting the rotation direction (vertical direction). Etc.) is restricted on the base end 53 side by the opening 51a of the main body 51, and since the distance L from the opening 51a to the point of action of the force is long, the opening 51a is bent and damaged. There was a problem that it often ends up.
[0007]
Further, in the conventional power tool, as shown in FIG. 6, since the operation unit 56 and the trigger 54 are close to each other, when the trigger 54 is operated, the finger 20 hits the operation unit 56 projecting downward and the operation is performed. There was a second problem that the operability of the trigger 54 was extremely poor. On the other hand, when the lever main body 55 is lengthened and the operation unit 56 is separated from the trigger 54 in order to solve such a problem, the portion exposed from the opening 51a of the main body 51 of the switching lever 52 becomes longer. As a result, there is a disadvantage that the probability of breakage of the switching lever 52, which is the first problem described above, greatly increases.
[0008]
As a third problem, there is a problem of holdability of the main body 51 during work. In other words, this type of electric tool holds the trigger 54 and supports the main body 51, but in the conventional electric power tool, most of the switching lever 52, particularly the lever main body 55 is removed from the main body 51. Since it is exposed, the switching lever 52 (lever body 55), which is a rotatable member, contacts the finger 20 that presses the trigger 54 during the operation. Accordingly, when the work is performed while holding the main body 51, the position of the finger 20 is not stabilized because the switching lever 52 that contacts the finger 20 that presses the trigger 54 is rotated. Has become unstable, and there is a problem that work cannot be performed accurately.
[0009]
As described above, the conventional power tool has many problems. However, as a means for preventing the switching lever 52 from being damaged, which is the first problem, Japanese Utility Model Publication No. 3-25912 is disclosed. There are some listed.
[0010]
The electric power tool described in this publication provides a front wall higher than the thickness of the switching lever 52 on the front side (opposite to the rotation center Q) of the operation portion 56 of the switching lever 52 and switches to both sides of the switching lever 52. It is formed by forming a side wall that regulates the rotation range of the lever 52, and is intended to prevent damage from the switching lever 52 by preventing the impact from the front and the impact from the side by the front wall and both side walls. is there.
[0011]
However, in the electric power tool described in the publication, although the probability of breakage of the switching lever 52 is reduced, the periphery of the operation unit 56 except for the lower side is surrounded by both walls. On the contrary, when the operation is attempted, both walls become obstacles, and there is a problem that the operability of the trigger 54, which is the second problem described above, is further deteriorated. Further, since the lower side of the switching lever 52 is exposed from the main body 51 and the bending in the direction intersecting the rotation direction is regulated on the base end 53 side of the switching lever 52 as in the conventional case, from the point of action of force. The distance L to the restriction portion is long, and there is a possibility that the switching lever 52 is bent and damaged by a force in a vertical direction or an oblique direction.
[0012]
Furthermore, since the lower side of the switching lever 52 is exposed from the main body 51, the finger 20 pressing the trigger 54 comes into contact with the lever main body 55 of the switching lever 52, which is the third problem described above. The problem of holdability of the main body 51 has not been solved.
[0013]
The present invention has been made to solve the above-mentioned conventional problems. In addition to enabling the switching lever to be prevented from being damaged, the operability of the trigger can be improved and the posture of the main body during work can be stabilized. It is an object of the present invention to provide an electric tool that can improve work accuracy.
[0014]
[Means for Solving the Problems]
The present invention has been made to solve the above-described problems. In the electric tool according to the present invention, a trigger 5 for operating rotation and stop of a rotating body 2 that holds and rotates the tool advances and retreats to and from the electric tool main body 1. A switching lever 6 is provided on the electric tool main body 1 so as to be rotatable and can be switched between forward and reverse rotation of the rotating body 2, and the switching lever 6 has a base end portion 8 attached to the electric tool main body 1. The lever body 7 is pivotally supported so that the tip 7a is disposed above the trigger 5, and the tip 5a of the lever body 7 is prevented from coming into contact with the operator's finger 20 that is in contact with the trigger 5. The power tool main body 1 is provided with a lever restricting body 10 that restricts bending in the direction orthogonal to the rotation range and the rotation direction of the switching lever 6. The lever restrictor 10 operates the trigger 5. The lever 20 is arranged between the trigger 5 and the lever body 7 of the switching lever 6 so as to cover the lever body 7 so that the operator's finger 20 does not contact the lever body 7. Side walls 11 arranged on both sides in the rotational direction of the lever body 7 to restrict the range, and connecting walls 12 that connect the side walls 11 and 11 and restrict the bending in the direction intersecting the rotational direction of the switching lever 6. The lower surface 12b of the connecting wall 12 is formed at substantially the same height as the upper surface of the trigger 5 so as not to protrude downward from the position of the upper surface of the trigger 5 .
[0015]
In the electric power tool according to the present invention, the lever restricting body 10 that restricts the bending of the switching lever 6 in the direction intersecting the rotation range and the rotation direction on the tip end side of the switching lever 6 is provided. Even when an impact or excessive force is applied to the switching lever 6 by mistake, the lever restricting body 10 located in the vicinity of the point of application of the force ensures rotation and deflection outside the rotation range of the switching lever 6. It is something to regulate.
[0016]
That is, unlike the conventional power tool that regulates the base end portion 8 side of the switching lever 6, the power tool according to the present invention allows the lever regulating body 10 to regulate the tip end side of the switching lever 6, thereby distance from the point of the force to the restricting portion of the lever regulating body 10 is shortened, the lever regulating body 10 is to greatly restricted as compared with the conventional amount of deflection of the switching lever 6.
[0017]
In particular, prior Symbol switching lever 6, the lever body 7 having a base end portion 8 is formed by axially supported on the tool body 1, made from the operation unit 9 for thus provided for the tip portion 7a of the lever main body 7, By configuring the lever restricting body 10 to be regulated on the distal end portion 7a side of the lever main body 7, the operator can reliably operate the operating portion 9 without the lever restricting body 10 obstructing the operation of the operating portion 9. Thus, the switching lever 6 can be rotated.
[0018]
Further, the lever restricting body 10 is connected to the side walls 11 formed on both sides of the lever body 7 in the turning direction so as to restrict the turning range of the switching lever 6, and the both side walls 11, 11 are connected to rotate the switching lever 6. by configuring the connecting wall 12 for regulating the deflection in the direction orthogonal to the moving direction, the side wall 11 is reliably restricted the predetermined range of pivoting of the lever main body 7, the deflection connecting wall 12 of the lever body 7 To regulate. Therefore, even if an excessive force is applied to the switching lever 6 from any direction, the lever restricting body 10 reliably restricts the turning and bending of the switching lever 6 beyond a predetermined range.
[0019]
In particular, the electric power tool main body 1 is a trigger 5 is provided for operating and stopping the rotation of the rotating body 2, the lever regulating body 10, is provided between the trigger 5 and the lever body 7 of the lever main body 7 By forming at least the front end portion 7a, the lever restricting body 10 reliably restricts the front end portion 7a side of the lever main body 7, and the lever restricting body 10 can freely rotate with the operator's finger pressing the trigger 5. This prevents contact with the main lever body 7. Therefore, the operator can grip the electric tool main body 1 without touching the lever main body 7, and can perform the work accurately in a state where the posture of the electric power tool main body 1 is stabilized.
[0020]
Also, by separating from the trigger 5 so as not to contact the operator's finger 20 to the front Symbol operation unit 9 abuts on the trigger 5, when the operator presses the trigger 5, the finger 20 is operating section 9 Therefore, the trigger 5 can be surely pressed without interfering with the rotation, and the rotation and stop of the rotating body 2 can be smoothly and repeatedly performed.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 3, reference numeral 1 denotes an electric power tool main body (hereinafter simply referred to as “main body”) provided with a rotating body 2 that holds and rotates a tool such as a drill blade or a bit. A power cord 3 is attached, and power is supplied from the power cord 3 to a motor (not shown) to rotate the rotating body 2.
[0022]
Reference numeral 4 denotes a switch unit provided in the main body 1, and the switch unit 4 is configured to energize the motor.
[0023]
Reference numeral 5 denotes a trigger connected to the switch unit 4, and the trigger 5 is formed so as to be able to advance and retract in the switch unit 4 of the main body 1 so as to operate rotation and stop of the rotating body 2.
[0024]
Reference numeral 6 denotes a switching lever provided above the trigger 5 for switching between forward and reverse rotation of the rotating body 2, and the switching lever 6 is connected to the switch portion 4 of the main body 1 with the point P of the base end portion 8 as a rotation center. It is provided so as to be rotatable. (See Figs. 2 and 3)
The switching lever 6 is integrally formed with a lever body 7 having a base end portion 8 pivotally supported by the switch portion 4 of the body 1 and a distal end portion 7a of the lever body 7, and protrudes toward the trigger 5 below. It is comprised from the operation part 9 which becomes.
[0025]
Reference numeral 10 denotes a lever restricting body as a restricting means provided between the trigger 5 and the lever main body 7, and the lever restricting body 10 is provided on the side of the distal end portion 7a of the lever main body 7 as shown in FIGS. It is formed integrally with the main body 1 so as to cover it.
[0026]
Specifically, as shown in FIG. 4, the lever restricting body 10 includes side walls 11 and 11 formed on both sides in the turning direction of the lever body 7 to restrict the turning range of the switching lever 6, The walls 11 and 11 are connected to each other and the connecting wall 12 that restricts the bending in the direction intersecting the rotation direction of the switching lever 6 is formed in a substantially U-shape in cross section. The inner surface 12a of the connecting wall 12 is formed so as to be in contact with the distal end portion 7a of the lever main body 7 when the switching lever 6 is rotated or bent in the vertical direction so that the rotation range of the switching lever 6 and the vertical deflection can be restricted. It becomes.
The lever restricting body 10 is formed so that the lower surface 12 b of the connecting wall 12 is substantially the same height as the upper surface of the trigger 5, and is formed so as not to protrude downward from the upper surface position of the trigger 5.
[0027]
As described above, the lever body 7 is covered with the outer periphery of the distal end portion 7a side by the lever restricting body 10 and the lower surface 1a of the body 1, and the base end portion 8 side is also accommodated in the body 1 so that the lever body 7 is entirely covered with the main body 1 and the lever restricting body 10. That is, the switching lever 6 is such that only the operation portion 9 at the tip protrudes from the main body 1 and is exposed so that the finger 20 of the operator who operates the trigger 5 does not come into contact with the lever main body 7 as shown in FIG. In addition, the operation unit 9 is separated from the trigger 5 by a predetermined interval so as not to come into contact with the finger 20 in contact with the trigger 5.
[0028]
Next, the use state of the electric tool having the above configuration will be described.
First, after attaching a tool to the rotating body 2, the main body 1 is gripped and the finger 20 is brought into contact with the trigger 5 to press the trigger 5 toward the main body 1.
[0029]
When the trigger 5 is pressed, power is supplied from the power cord 3 to the motor via the switch unit 4, and the rotating body 2 holding the tool rotates, so that, for example, work such as drilling can be started. When the pressing of the trigger 5 is released, the energization of the switch unit 4 is released, the motor is stopped, and the rotation of the rotating body 2 is stopped.
[0030]
When the operating portion 9 of the switching lever 6 is rotated in the direction of arrow B shown in FIG. 3 during this work, the rotation of the rotating body 2 is switched to rotate in the opposite direction (reverse rotation), and again in the direction of arrow A in FIG. When it moves, the rotating body 2 rotates forward.
[0031]
In this way, by rotating the operating portion 9 of the switching lever 6, it is possible to repeatedly switch between normal rotation and reverse rotation of the rotating body 2 and perform a drilling operation or the like.
[0032]
In order to perform such drilling operations and the like accurately, the posture of the main body 1 needs to be stabilized. However, in the electric power tool in the present embodiment, the lever main body 7 is covered with the lever restricting body 10 (main body 1). Therefore, the operator's finger 20 contacts the fixed lever restricting body 10 without contacting the rotatable lever body 7. Therefore, as compared with the case where the lever main body 7 is exposed as in the prior art, the operator can securely hold the main body 1 and can stabilize the posture of the main body 1 to perform the work. Thus, the machining accuracy of the drilling operation and the like can be greatly improved.
[0033]
Further, since the operation unit 9 is separated from the trigger 5 by a predetermined interval so as not to contact the finger 20 that is in contact with the trigger 5, the trigger 5 is reliably pressed and released without interfering with the operation unit 9. Can be done. Accordingly, there is no inconvenience such as the finger 20 being caught on the operation portion 9 when the trigger 5 is pressed as in the conventional case, so that the work efficiency is greatly improved as compared with the conventional case.
[0034]
In addition, since the switching lever 6 has the tip 7a side of the lever body 7 covered with the lever restricting body 10, an excessive force is applied to the switching lever 6 even when the body 1 is dropped during the operation. The probability of breakage is greatly reduced as compared with the conventional case.
[0035]
In addition, even if an excessive force is applied to the exposed operation portion 9, the lever restriction body 10 is provided on the distal end portion 7 a side of the lever body 7, so that the lever restriction body 10 is switched. The lever 6 is prevented from being damaged by reliably regulating the rotation of the lever 6 outside the predetermined range and the bending in the vertical direction.
[0036]
That is, since the restricting portion where the lever restricting body 10 restricts the lever main body 7 is located in the vicinity of the point of action of the force acting on the operating portion 9, from the fulcrum when the switching lever 6 is bent to the point of action of the force. As a result, the distance L is shortened. As a result, even when the same force as the conventional force is applied, the amount of bending of the switching lever 6 can be suppressed to be extremely small compared to the conventional case, and the switching lever 6 is reliably prevented from being damaged. It is.
[0037]
In particular, since the lever restricting body 10 is formed integrally with the main body 1, the strength of the lever restricting body 10 against impact is improved, and the lever restricting body 10 restricts the switching lever 6 more reliably and firmly. it can.
[0038]
Note that the length of the lever main body 7 is longer than that of the conventional case by separating the operation unit 9 from the trigger 5 by a predetermined interval. However, the electric tool according to the present invention has a base end 8 side as in the conventional case. Unlike the case where the switching lever 6 is restricted, the distal end side of the switching lever 6 (the distal end portion 7a side of the lever body 7) is restricted, so that the distance L from the point of application of the force from the outside is shortened. 6 can be suppressed.
[0039]
As described above, the electric power tool according to the present embodiment can prevent the switching lever 6 from being damaged by an impact from any direction by covering the tip 7a side of the lever body 7 with the lever restricting body 10. In addition, the operability of the trigger 5 is improved, the work efficiency is improved as compared with the conventional case, the posture of the main body 1 during the work is stabilized, and the work accuracy can be improved.
[0040]
Further, since the lever restricting body 10 is formed integrally with the main body, the strength of the lever restricting body 10 can be improved, and the switching lever 6 can be more reliably prevented from being damaged. There is an advantage that it can be manufactured at a lower cost than the case where 10 is separated.
[0041]
In the above-described embodiment, the lever regulating body 10 is formed so as to cover all the portions protruding from the main body 1 of the lever main body 7. However, the shape of the lever regulating body 10 is limited to this. Instead, it is possible to adopt various shapes.
[0042]
For example, as shown in FIG. 5, the lever restricting body 10 may be formed so as to cover only the front end portion 7a of the lever main body 7. In such a case, the front end portion 7a of the lever main body 7 is the lever. When excessive force from the outside is applied to the operation unit 9 by being restricted by the restriction body 10, the distance L from the point of application of the force to the restriction point is shortened, and the amount of bending of the switching lever 6 is suppressed. Breakage can be prevented.
[0043]
However, by covering the entire lever body 7 with the lever restricting body 10, it is possible to prevent the operator's finger 20 pressing the trigger 5 from coming into contact with the rotatable lever body 7. Therefore, there is an advantage that the posture of the main body 1 during the operation can be stabilized and the processing accuracy of the drilling operation or the like can be improved.
[0044]
Even if the lever restricting body 10 is a separate body from the main body 1 or is configured other than between the trigger 5 and the lever main body 7, it is within the range intended by the present invention.
[0045]
【The invention's effect】
As described above, the electric power tool according to the present invention is provided with the lever restricting body that restricts the deflection in the direction intersecting the rotation range and the rotation direction of the switching lever on the tip end side of the switching lever. Therefore, the lever restricting body reliably restricts the rotation outside the rotation range of the switching lever and the bending in the direction intersecting the rotation direction, and can prevent the switching lever from being damaged.
[0046]
In particular, by configuring so as to restrict the lever regulating member at the tip end of the lever body, on top of it is possible to prevent breakage of the switching lever, rotates without lever regulating body becomes an obstacle to operation of the operation portion It is possible to work by smoothly switching between normal and reverse rotation of the body, and work efficiency can be improved.
[0047]
Further, the side walls formed by formed on both sides in the rotational direction of the lever body so as to restrict the rotation range of SWITCHING lever, restricting the deflection in the direction orthogonal to the rotating direction of connecting the both said sidewalls switching lever By providing a lever restricting body with a connecting wall, the lever restricting body reliably regulates the bending of the switching lever, regardless of the excessive force applied to the switching lever from any direction. Can be reliably prevented.
[0048]
In particular, by forming to cover at least the front end portion of the lever main body provided with a lever regulating body between the trigger and the lever body, on top of the lever regulating body can be prevented damage to regulate the switching lever, The operator can grip the electric power tool main body without touching the lever main body , the posture of the electric power tool main body during the work can be stabilized, and the working accuracy can be improved.
[0049]
Also, by separating from the trigger so as not to contact the operator's fingers to contact the operation unit as a trigger, it is possible to prevent interference between the operation unit and the operator's finger, smooth trigger pressed, As a result of being able to perform the release, work efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a front view of a power tool according to an embodiment of the present invention.
FIG. 2 is a front view including a partial cross section showing a main part of the electric power tool of one embodiment.
FIG. 3 is a bottom view showing a main part of the electric power tool according to one embodiment.
4 is an end view taken along the line RR in FIG. 2 showing the main part of the electric power tool of one embodiment.
FIG. 5 is a bottom view showing a main part of a power tool according to another embodiment.
FIG. 6 is a front view showing a main part of a conventional electric tool.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Rotating body, 3 ... Power cord, 4 ... Switch part, 5 ... Trigger, 6 ... Switching lever, 7 ... Lever main body, 7a ... Tip part, 8 ... Base end part, 9 ... Operation part, 10 ... Lever regulating body (regulating means), 11 ... side wall, 12 ... connecting wall, 20 ... finger

Claims (1)

A trigger (5) that operates to rotate and stop the rotating body (2) that holds and rotates the tool is provided in the electric tool main body (1) so as to freely move forward and backward, and performs switching between forward and reverse rotation of the rotating body (2). A switching lever (6) for rotating the power tool body (1),
The switching lever (6) includes a lever body (7) having a base end portion (8) pivotally supported by the electric power tool body (1) and a distal end portion (7a) disposed above the trigger (5); An operation portion (9) disposed at a distal end portion (7a) of the lever body (7) so as not to come into contact with an operator's finger (20) contacting the trigger (5) so as to be separated from the trigger (5); Consists of
The electric power tool body (1) is provided with a lever restricting body (10) for restricting bending in the direction orthogonal to the rotation range and the rotation direction of the switching lever (6).
The lever regulating body (10) includes a trigger (5) and a switching lever so as to cover the lever body (7) so that the finger (20) of the operator who operates the trigger (5) does not contact the lever body (7). Side walls (11) disposed between the lever main body (7) and the lever main body (7) and on both sides of the lever main body (7) in the rotation direction so as to restrict the rotation range of the switching lever (6). ) And a connecting wall (12) that connects the side walls (11, 11) and restricts the bending in the direction intersecting the rotational direction of the switching lever (6),
The electric power tool characterized in that the lower surface (12b) of the connecting wall (12) is formed at substantially the same height as the upper surface of the trigger (5) so as not to protrude downward from the position of the upper surface of the trigger (5) .

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