JPH0346270B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a mounting tool for a driving screw, and in particular, a tool for driving a driving screw by first applying a striking force of a required stroke to drive the screw tip into a target object. Thereafter, the present invention relates to a driving screw mounting tool that enables efficient screw mounting work by applying pressing force to the screw head and rotational driving force to the screw.

[Conventional technology]

For screw installation work, there is a driving screw installation tool that can perform both the driving process and the screwing process (that is, the screw rotation process) using one tool.
The one described in Publication No. 46930 is known.

This driving screw (also referred to as a screw nail) installation tool has a driver that can move forward and backward, and the rear end of this driver is equipped with an impact device, that is, a piston housed in a cylinder, to strike the rear end of the driver. Further, the driver is configured to transmit rotational power from a drive source.

[Problem to be solved by the invention]

The conventional driving screw installation tool described above has the following problems.

(1) In general, when screwing a screw into an object, simply applying rotational force is not enough to ensure reliable screw-in work; only by rotating while applying pressing force. be.

However, in the conventional driving screw mounting tool, after the piston hits the rear end of the driver and collides with the buffer member, it is not possible to apply pressing force to the driver, and the screw does not smoothly hit the target object. There is a problem in that it is unable to penetrate and is idling.

(2) The object to which the drive screw is fastened is generally a metal plate, etc., but this object is of various thickness, some thick, some thin, etc.
Accordingly, various long and short drive screws are used.

However, the sliding stroke of the piston in the conventional mounting tool is not variable but always constant. For this reason, the stroke of the driver struck by the piston is also constant, so when the driving screw is short, the tip of the driving screw cannot be driven into the object by the required amount, and conversely, when the driving screw is long, The rotation applies a blow to the screw that should normally be screwed in, causing problems such as crushing the thread.

The present invention provides a driving screw mounting tool that solves the above-mentioned problems.

[Means to solve the problem]

The driving screw installation tool according to the present invention includes a case body provided with a cylinder containing a piston operated by compressed air, and transmits the striking force of the piston to a driver slidably inserted into the cylinder. The drive screw supplied to the nose provided at the tip of the screwdriver is struck by the tip of the driver, and a motor transmits rotational force to the driver through a gear mechanism, so that the rotation of the driver is transmitted to the drive screw. In the driving screw installation tool, the cylinder has a first cylinder member and a second cylinder member formed by screwing threaded parts formed on the respective cylinder walls facing each other on the opening side.
The first cylinder member is fixed to the case body, while the piston contact surface of the inner circumferential cylinder part provided integrally with the second cylinder member is movable in the axial direction of the piston. The second cylinder member is configured to be rotatable from the outside of the main body,
A driver is installed to pass through the center of the second cylinder member in an airtight and slidable manner, and the upper end of the driver is configured to be able to be hit by the lower surface of the piston. An air passage which is opened when the piston hits the collision surface passes through the upper and lower end surfaces of the piston, and the lower end of the air passage is provided opposite to the compressed air pressure receiving surface at the upper end of the driver. Features.

[Effect]

The piston moves back and forth by supplying compressed air into the first cylinder member, and at this time, the piston drives a screwdriver, driving the tip of the screw held at the tip of the driver into the object. .

At this time, the second cylinder member is moved with respect to the first cylinder member by screwing adjustment to change the position of the piston contact surface of the second cylinder member, which is the forward moving tip of the piston, and thereby The protrusion amount of the driver driven by the piston is changed in accordance with the length of the driving screw, and the tip of the screw is driven into the object by the required amount according to the length of the screw.

After driving the screw into the object, the driver is driven by a motor to give rotation to the screw and drive it into the object.

At the same time, the valve device of the air passage provided in the piston that is in contact with the end surface of the second cylinder member opens, and the compressed air in the first cylinder member is transferred to the second cylinder member.
The air pressure is sent into the cylinder member, and the air pressure is applied to the pressure receiving surface of the driver, and the driver screws the driving screw into the object while applying thrust.

〔Example〕

Hereinafter, each embodiment of the present invention will be described with reference to the drawings.

FIRST EMBODIMENT FIGS. 1 and 2 show a first embodiment, in which 1 is a case body, 2 is a grip part that communicates with the inside of the case body 1 via a communication part 3, and an air chamber 4 is inside the grip part. is formed.

Inside the case body 1, a cylinder 5 consisting of a first cylinder member 5a and a second cylinder member 5b is housed.

A piston 6 is inserted airtightly and slidably into the first cylinder member 5a, and 7 is a driver. The driver 7 includes a shaft portion 7a and a driver body 7 that is detachably coupled to the shaft portion 7a.
It is composed of b.

Although not shown, the driver body 7
b, it is possible to replace it with one of a bit configuration to match the head shape of various driving screws.

In FIG. 1, a driving valve body 10 is provided between a head block 8 provided at the upper part of the case body 1 and the upper end of the first cylinder member 5a. Head valve 1 provided on this head block 8
An air pipe 12 is installed between the air pipe 1 and the air chamber 4.
and the trigger valve 1 connected to the air pipe 12
3 are arranged.

This head valve 11 includes a head valve cylinder 15 constituted by a combination of a head block 8 of the case body 1 and a piston stopper 14 provided inside the head block 8, and a head valve cylinder 15 that is slidably and tightly fitted into the head valve cylinder 15. It is composed of a driving valve body 10.

The upper end of the air pipe 12 is connected to the head valve cylinder 15, so that when the trigger valve 11 is not operated, the air chamber 4
The air inside is led to the upper chamber 16 of the head valve cylinder 15 through the air pipe 12, and the driving valve body 10 is moved downward.

That is, the area of the upper pressure receiving part 10a of the driving valve body 10 is equal to the area of the lower pressure receiving part formed between the lower end of the head valve cylinder 15 and the upper end 15a of the first cylinder member 5a at the lower end of the driving valve body 10. It is formed larger than the area of 10b. Therefore, the air pressure from the air chamber 4 is transmitted to the upper pressure receiving part 1 of the driving valve body 10 rather than to the lower pressure receiving part 10b.
0a, and pushes down this driving valve body 10.

At this time, the lower end of the drive valve body 10 is in airtight contact with the upper end surface of the first cylinder member 5a (specifically, the packing member 17 provided on this upper end surface), and the head of the drive valve body 10 is in airtight contact with the upper end surface (specifically, the packing member 17 provided on this upper end surface). Valve cylinder 1
5 are in close contact with each other, the piston upper chamber 28 in the first cylinder member 5a and the air chamber 4 are cut off, and no air pressure is applied to the piston 6.

At this time, the lower end of the buffer spring 18 attached to the piston stopper 14 is in contact with the drive valve body 10, and works together with the upper pressure receiving part 10a of the drive valve body 10 to push down the drive valve body 10. In addition to performing an auxiliary action, when the piston 6 returns, its protrusion 6a
passes through the lower opening 19 of the drive valve body 10 and is received by the piston stopper 14.

The trigger valve 13 for actuating the head valve 11 is comprised of a casing 20 provided on the grip 2 and an operating rod 27 slidably built into the casing 20.

That is, the air passage 2 provided in the casing 20
1 is in communication with the air pipe 12, and the other end is bifurcated into a first branch passage 22.
communicates with the air chamber 4, and the second branch passage 2
3 communicates with the atmosphere.

Further, when the operating rod 27 is not operated, it is pushed downward via a coil spring 26 built in its small diameter portion 24 and a recess 25 provided in the casing 20 .

In this way, when the operating rod 27 is not operated,
The second branch passage 23 is pushed downward and closes the second branch passage 23 communicating with the atmosphere at its outer periphery, while the second branch passage 23 communicates with the air chamber 4 through the small diameter portion 24.
is open so as to communicate with the air passage 21.

When the operating rod 27 is pressed against the coil spring 26, this passage is switched, the air passage 21 and the first branch passage 22 are communicated, and the air passage 21 and the second branch passage 23 are cut off. It is something.

Therefore, if you press the operation rod 27 now,
The upper chamber 16 of the head valve cylinder 15 becomes atmospheric pressure via the trigger valve 13 and the air pipe 12, and the upper pressure receiving surface 10a of the drive valve body 10 has
Due to the application of air pressure, the drive valve body 10 is lifted.

Therefore, the space between the lower pressure receiving surface 10b of the driving valve body 10 and the upper end (that is, the packing member 17) of the first cylinder member 5a opens, and the air chamber 4
The piston upper chamber 28 of the first cylinder member 5a communicates with the piston 6, thereby rapidly pushing the piston 6 downward.

In addition, in FIG. 1, when the drive valve body 10 is downward, the piston 6 is upwardly lifted.

Further, the driven valve body 10 has an exhaust hole 29, and when the driven valve body 10 is moving downward, the exhaust hole 29
An exhaust passage 30 communicating with the head block 8 is provided in the head block 8, and when the piston 6 moves upward, the air in the upper chamber 28 of the first cylinder member 5a is transferred to the drive valve body 10.
The air is exhausted to the outside through a lower end opening 19, an exhaust hole 29, and an exhaust passage 30.

Next, a related structure between the first cylinder member 5a and the second cylinder member 5b will be explained.

On the outer periphery of the cylindrical part of this first cylinder member 5a,
An annular protrusion 31 is provided, and this annular protrusion 31 is engaged with the upper surface of an annular engagement part 32 provided on the inner periphery of the case body 1, and is airtightly fixed via an O-ring 33. Further, a male thread 34 is formed on the lower outer periphery of the first cylinder member 5a.

On the other hand, the second cylinder member 5b has an inner cylindrical portion 35 and an outer cylindrical portion 36, as shown in the figure, and both are integrally formed at a lower end connecting portion 37. A female thread 38 is formed on the inner periphery of this outer circumferential cylinder part 36, and the lower part of the first cylinder member 5a is connected to the second cylinder member 5a.
Inner cylindrical portion 35 and outer cylindrical portion 36 of cylinder member 5b
After inserting into the gap 39, the male screw 34 and the female screw 3
8 are screwed together so that they can move forward and backward.

This outer circumferential cylinder portion 36 is brought into close contact with the inner circumferential surface of the case body 1 via an O-ring 40. Furthermore, an abutting surface 41 is provided at the forward end of the piston 6, which the lower end of the piston 6, which is slidably inserted into the first cylinder member 5a through the upper end surface of the inner circumferential cylindrical portion 35, comes into contact with.

Furthermore, the outer circumferential cylinder portion 36 of the second cylinder member 5b
A rotary operation section 9 for finger hooking is provided at the lower end of the case body 1, and a portion of the rotation operation section 9 is located in an opening 42 formed in a portion of the cylindrical wall of the case body 1.

Therefore, by rotating the rotary operation part 9 in the opening 42, the female thread 38 provided in the outer circumferential cylinder part 36 moves up and down along the fixedly provided male thread 34 of the first cylinder member 5a. do. Therefore, the entire second cylinder member 5b moves up and down within the range provided with the screw 38, and the piston contact surface 4 of the inner circumferential cylinder portion 35 with which the piston 6 collides at the forward end
The position No. 1 can be moved up and down, thereby making it possible to freely change the forward stroke of the piston 6.

That is, the second cylinder member 5b is movably coupled to the first cylinder member 5a within the range where the female screw 38 is provided.

A shaft portion 7a of a screw driver 7 is inserted into the second cylinder member 5b, and the tip of the shaft portion is provided in contact with the lower surface of the piston 6. A male spline 43 is formed on the outer periphery of this shaft portion 7a, and a drive cylinder 44 is attached to this.
A female spline 45 formed on the upper part of the inner circumference is fitted therein. The upper end of the drive cylinder 44 has a seal portion 46
It is fitted airtightly and rotatably into the second cylinder member 5b via the second cylinder member 5b.

A plurality of communication holes 47a are formed in the lower part of the first cylinder member 5a, and there is a gap between the piston lower cavity 48 and the cavity 49 formed between the first cylinder member 5a and the case body 1. They communicate through a communication hole 47a.

Further, a plurality of communication holes 47 are also formed in the upper part of the first cylinder member 5a, and an elastic ring 50 that can freely open and close the communication holes 47 is formed on the outer periphery of the first cylinder member 5a. The opening position of the communication hole 47 is higher than the upper end surface of the piston 6 when the piston 6 is set at the maximum stroke and is located at the forward forward end. When the piston upper chamber 28 of the first cylinder member 5a is filled with compressed air in order to move the piston 6 back and forth, a part of this compressed air pushes and expands the elastic ring 50 that closes the communication hole. Then, the communication hole 47 is opened, the chamber 49 is entered, and the piston 5, which is inside the piston lower chamber 48 and the second cylinder member 5b, passes through the lower communication hole 47a.
Enter 1. Note that at this time, the air pressure that presses the top surface of the piston 6 is greater than the air pressure that presses the bottom surface of the piston 6.

Further, the piston 6 is formed with an air passage 52 that communicates the piston upper chamber 28 and the piston lower chamber 51. When traveling, the piston upper chamber 28 to the piston lower chamber 51
This prevents compressed air from entering. Further, the operating shaft 55a is inserted into the shaft hole 55 formed in communication with the air passage 52, the upper end of the operating shaft 55a is placed against the ball valve 54, and the lower end is connected to the piston 6.
It is configured to project slightly from the lower end surface of the cylinder member 5b so as to be able to engage with the piston contact surface 41 of the second cylinder member 5b.

Therefore, when the piston 6 hits the piston contact surface 41, the operating shaft 55a lifts up, pushes up the ball valve 54, opens the air passage 52, and directs the compressed air in the piston upper chamber 28 to the piston. It is supplied to the lower chamber 51.

Therefore, a stepped portion 5 is provided on the inner circumference of the drive cylinder 44.
6, and an O-ring 58 fitted to the shaft portion 7a of the driver 7 is slidably fitted into the large-diameter hole 57 below the O-ring 58, so that the upper surface of the O-ring 58 is inside the piston lower chamber 51. The driver 7 receives the pressure of the compressed air and gives thrust to the driver 7.

Further, the lower part of the drive cylinder 44 is attached to a bearing 60 on a support block 59 provided at the lower part of the case body 1.
It is rotatably supported via. A worm wheel 61 fixed to the drive cylinder 44 is rotatably disposed in a space 59a formed in the support block 59, and a worm 62 is engaged with the worm wheel 61. Warm 62 is
It is connected to an output shaft 63a of a drive motor 63, such as an air motor or an electric motor, which is attached to the support block 59.

Therefore, by driving the drive motor 63, the drive cylinder 44 rotates via the worm 62 and the worm wheel 61, so that the shaft portion 7a of the driver 7 rotates while being subjected to thrust.

64 is a drive motor 63 attached to the case body 1
It is a limit switch that operates the Also, 6
Reference numeral 5 denotes a limit switch for stopping, which is attached to the tip of a nose 67 provided at the bottom of the case body 1 so that the driver 7 and the driving screw 66 can move forward and backward. That is, the operating rod 64a of the limit switch 64 is connected to the case body 1 and the first cylinder member 5.
When the piston 6 moves to the forward end, the pressure of the compressed air in the piston upper chamber 28 pushes the elastic ring 50 open, and the air flows through the communication hole 47 into the cavity 49. The compressed air forced into the drive motor 63 presses the operating rod 64a and turns on the limit switch 64.
It operates.

Next, 68 is an end plate that closes the lower side of the support block 59 in the lower part of the case body 1, and the shaft portion 7a of the driver 7 is inserted through the shaft hole 69 provided in the end plate 68, and the shaft portion 7a of the driver 7 is inserted downward. It is inserted into. As a result, the shaft portion 7 is inserted into the nose 67 attached to the end plate 68.
A driver main body 7b, which is integrated with the main body 7a, is freely advanced and retractable.

A screw supply port 6 is provided on the circumferential side of the nose 67.
7a is opened, and a magazine 70 is attached to this. Further, a large number of drive screws 66 stored in the magazine 70 are pushed by the pusher 71 and continuously supplied into the nose 67 through the screw supply port 67a. Furthermore, a coil spring 72 attached to the driver body 7b is housed in the upper part of the nose 67, and the upper end of the coil spring 72 hits the stepped portion 73 of the driver body 7b.
The driver 7 is urged upward. This driver 7 has a fitting hole 74 formed at the lower end of the shaft portion 7a.
The driver main body 7b is configured to be detachably attached from below. The threaded portion 67b provided at the tip of the nose 67 has a threaded member 7 of the expansion member 75.
6 are screwed together. The expansion member 75 is constructed by urging a cylindrical expansion piece 77 divided into a plurality of pieces toward the center by an elastic ring 78 and connecting it to a screw member 76 .

This expansion piece 77 has a screw 66 inserted into its inside.
When the head of the nose 67 passes, it is pushed open against the elastic ring 78, and at this time, the outer periphery of the expanding piece 77 presses the operating rod 65a of the limit switch 65 attached to the tip of the nose 67. This causes the drive motor 63 to stop.
Therefore, when the final step of mounting the driving screw 66 on the object 79 is completed, the rotation of the driver 7 is automatically stopped.

Therefore, according to this embodiment, when the operating rod 27 of the trigger valve 13 is operated, compressed air is supplied to the piston upper chamber 28 and the piston 6 descends, striking the upper end of the driver 7 and driving the screw 66.
can be driven into the object 79. At this time,
Since the height position of the piston contact surface 41 of the second cylinder member 5b can be appropriately set according to the length of the driving screw 66, the tip of the driving screw 66 is reliably driven into the object 79 by the required amount.

When this screwing is completed, the limit switch 65 in contact with the expansion member 75 is activated, the drive motor 63 is stopped, the tip of the driving screw 66 is driven, and the screwing installation process is completed. In addition, 92 in the figure is a switch that rotates the drive motor 63 in the forward direction or in the reverse direction.
This configuration is convenient for reversing the drive motor 63 and removing the screw 66 when the screw 66 is attached by mistake.

Second example Next, a second embodiment shown in FIG. 3 will be described.

In this embodiment, the same components as in the first embodiment are given the same reference numerals, redundant explanation will be omitted, and only the different components will be explained.

In the second embodiment, the upper end of the driver 7 is
The piston 6 and the piston stopper 14 pass through the head block 8 of the case body 1 and protrude outward, and a spline 80 is formed on the driver 7 on the outside of the case body 1. Further, a drive motor 81 is attached to the outside of the case body 1, and a gear 82 rotatably attached to an output shaft 81a of the drive motor 81 is meshed with a gear 83 spline-coupled to be slidable relative to the spline 80.

On the other hand, within the piston 6, the driver 7 is provided with a collar 84, and a slide bearing 85 is disposed on the collar to rotatably support the upper and lower surfaces of the collar 84. Therefore, due to the forward movement of the piston 6, the screw driving operation is transmitted to the driver 7 via the collar 84, and the tip of the driving screw 66 is driven into the object 7.
Type in 9. Thereafter, the drive motor 81 applies rotational force to the driver 7 to perform screwing.

A flange 86 is provided at the lower end of the driver 7, and a male spline 87 is provided on this.The male spline 87 is fitted into a female spline 90 provided in a cylindrical portion 89 at the top of the driver body 88. Spring 91 housed in cylindrical portion 89
is pressed against the lower end of the driver 7 provided with a male spline 87. For this reason, the driver body 88 is rotatable integrally with the driver 7, and a downward force is applied by the spring 91, so when screwing in the drive screw 66, the driver body 88 is rotated integrally with the driver 7. 88 allows the driving screw 66 to be screwed into the object while applying thrust.

〔Effect of the invention〕

As explained above, the present invention provides a mounting tool that drives the tip of a driving screw into an object with a driver that is struck by a piston, and then screws in the driving screw while rotating the driver and applying thrust to the driving screw. By rotating the second cylinder member of the cylinder consisting of the first and second cylinder members, the impact position of the piston can be varied, and by changing the forward stroke of the piston, the amount of thrust of the driver can be adjusted to the length of the driving screw. It can be adjusted appropriately. Therefore, regardless of whether the screw is long or short, only the tip thereof can be properly driven into the object, and the adjustment operation can be performed extremely easily.

Furthermore, air passages are provided through both ends of the piston so that the passages are opened after the piston hits the impact surface, and compressed air passing through these air passages is supplied to the rear end of the driver to provide thrust to the driver. Since the screwdriver is configured to provide a simple configuration, thrust can be reliably applied to the screwdriver, and a smooth screw-in operation can be performed.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a sectional view of the first embodiment of the driving screw installation tool according to the present invention, FIG. 2 is an enlarged sectional view of the expanding member, and FIG. It is a sectional view of an example. 1...Case body, 5...Cylinder, 5a...
First cylinder member, 5b... second cylinder member,
6...Piston, 7...Driver, 63
...Motor, 66...Drive screw, 67...Nose.

Claims (1)

[Claims] 1. A case body is provided with a cylinder containing a piston operated by compressed air, and the striking force of the piston is transmitted to a driver slidably inserted into the cylinder. The driving screw is configured such that the driving screw supplied to the nose is hit with the tip of the screwdriver, and rotational force is transmitted to the driver by a motor via a gear mechanism, so that the rotation of the driver is transmitted to the driving screw. In the mounting tool, the cylinder is composed of a first cylinder member and a second cylinder member, each of which has an opening side facing each other and screws screwed together threaded parts formed on the respective cylinder walls, and the first cylinder member is fixed to the case body, and on the other hand, the second cylinder member is inserted from outside the case body so that the piston contact surface of the inner circumferential cylinder part provided integrally with the second cylinder member is movable in the axial direction of the piston. A driver is configured to be rotatably operable, and a driver is installed to pass through the center of the first cylinder member in an airtight and slidable manner, and the upper end of the driver is configured to be able to be hit by the lower surface of the piston, and is provided in the middle of the passage. Air passages that are opened when the piston hits the contact surface of the valve body penetrating the upper and lower end surfaces of the piston,
A driving screw mounting tool characterized by a configuration in which the lower end of the air passage is provided opposite to the compressed air pressure receiving surface of the upper end of the driver.