JP2000263468A - Driving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the life of a push lever and improve the productivity by providing a cushioning member consisting of an elastic material on at least a part of the push lever. SOLUTION: A piston 2 suddenly lowered within a body 1 is collided with a bumper 14 provided on the lower part within the body 1. At this time, the impact force 15 applied to the body 1 is applied also to an upper push lever 6a through a spring 7. The impact force 15 applied to the upper push lever 6a is absorbed and mitigated by the deformation of a cushioning member 11 for connecting the upper push lever 6a to a screw 8. Since the impact force 15 applied to the push lever 6 in driving can be absorbed and mitigated by the cushioning member 11 consisting of an elastic body provided on the push lever 6, the life of the push lever 6 can be improved. Further, when the push lever 6 is subjected to not high-temperature heat treatment but low-temperature heat treatment, the post-maching can be omitted to improve the productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving machine having a push lever as a safety device for a trigger.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional driving machine.

The push lever 6 of the driving machine shown in the figure is divided into a first push lever 6a extending from the vicinity of the trigger 5 to the tip of the injection unit 4, and a lower push lever 6b shaped to cover the outer periphery of the lower end of the injection unit 4. The push lever 6 is supported by the main body 1 so as to be slidable in the vertical movement direction of the drive bit 3. The push lever 6 is urged by a spring 7 provided at an upper portion thereof to always move to the injection unit 4 side.
Are located below and the upper push lever 6a works to prevent the trigger 5 from rotating.

In the driving machine shown in the drawing, the lower push lever 6b is pressed by the head of the stopper 16, the push lever 6 rises against the urging force of the spring 7, the trigger 5 is operated, and the piston inside the main body 1 is operated. 2 and the drive bit 3 are suddenly lowered, and the stopper 16 inside the ejection section 4 is being driven.

When the driving operation is performed as described above, an impact force 15 is applied to the main body 1 due to a sudden drop of the piston 2 and the drive bit 3, and the impact force 15 supports the spring 7 and the push lever 6. It is also applied to the push lever 6 via the member or the like. That is, the impact force 15 is repeatedly applied to the push lever 6 for each driving operation.

Further, in the case of a driving machine in which the push lever 6 is raised by the head of the stopper 16 as shown in FIG. 4, the head of the stopper 16 is located within the lower end of the lower push lever 6b as shown in the figure. There is a possibility that the driving operation may be performed in a state where the push lever 6 has entered, and in this case, a large impact force is applied to the push lever 6.

[0007] In order to suppress breakage due to the above-mentioned impact and wear due to contact with other members, the push lever needs to have high strength, high toughness and high wear resistance.

The conventional push lever 6 is formed by pressing a steel material to form a shape, and is subjected to a high-temperature heat treatment such as a carburizing treatment after the pressing to add high strength and high toughness.

[0009]

The push lever 6 of the conventional driving machine as described above has a structure in which high strength and high toughness are added by performing high-temperature heat treatment in the production process. , A large amount of heat treatment distortion is generated, and post-processing such as bending correction is required, resulting in poor productivity.

As a method of eliminating post-processing after heat treatment,
Instead of the high-temperature heat treatment, it is conceivable to perform a low-temperature heat treatment with less heat treatment distortion, but in this case, the strength of the push lever 6 is low and the push lever 6 has a short life. It is also conceivable to increase the strength of the push lever 6 by increasing the diameter of the push lever 6, but in this case, it hinders the weight reduction of the driving machine and greatly increases the dimensional accuracy generated during press working. Post-processing is required.

When the output of the driving machine increases, the load applied to the push lever 6 also increases, but the push lever 6 may be damaged by the strength and toughness of the conventional push lever 6.

An object of the present invention is to provide a driving machine which can solve the above-mentioned drawbacks and can improve the life of the push lever or improve the productivity.

[0013]

The above object is achieved by providing at least a part of the push lever with a buffer member made of an elastic material.

[0014]

1 and 2 show one embodiment of the driving machine according to the present invention.

FIG. 1 is an enlarged cross-sectional view of a main part of the driving machine. , An injection unit 4 provided below the main body 1 for guiding the vertical movement of the drive bit 3 and guiding a stopper driven by the drive bit 3, and a trigger 5 for controlling the vertical movement of the piston 2. , A safety device for the trigger 5, extending from the vicinity of the trigger 5 to the vicinity of the ejection section 4, and always having the push lever 6, which is slidably held in the axial direction of the drive bit 3, on the tip side of the ejection section 4. And a biasing spring 7.

The push lever 6 is an upper push lever 6
a and a lower push lever 6b.
Between the upper push lever 6a and the lower push lever 6b, a screw 8, an adjuster 9 and a bolt 10 for rotatably attaching the adjuster 9 to the lower push lever 6b are provided. The upper push lever 6a is sandwiched by a buffer member 11 made of an elastic material such as rubber, and a spring 13 provided between the washer 12 provided above the screw 8 and the buffer member 11 to push the buffer member 11 and the upper push lever 6a. The lever 6a is always biased toward the lower push lever 6b. With such a configuration, the upper push lever 6a and the lower push lever 6b are connected to the buffer member 11,
They are connected via screws 8, adjusters 9 and bolts 10.

The driving machine shown in the figure shows a state in which the trigger 5 has been operated and the driving operation has been carried out.
Is located upward against the urging force of the spring 7 and the rotation of the trigger 5 is prevented from being prevented.

As shown in the figure, when the push lever 6 is raised and the trigger 5 is operated, the piston 2 and the drive bit 3 are lowered rapidly in the main body 1, and the lower end of the drive bit 3 is located in the injection section 4. The stop 16 is driven.

The piston 2 which has suddenly descended in the main body 1 collides with a bumper 14 provided in the lower part of the main body 1. At this time, an impact force 15 applied to the main body 1
Via the upper push lever 6a.

The impact force 15 applied to the upper push lever 6a is absorbed and reduced by the deformation of the buffer member 11 connecting the upper push lever 6a and the screw 8 as shown in FIG. 2B.

Since the push lever 6 is provided with the cushioning member 11 made of an elastic material as described above, the impact force 15 applied to the push lever 6 at the time of driving can be absorbed and reduced. Can be extended.

Further, the provision of the cushioning member 11 makes it possible to absorb and reduce the impact force 15 applied to the push lever 6, so that post-processing can be performed by performing low-temperature heat treatment instead of high-temperature heat treatment. It can be deleted and productivity can be improved.

FIG. 3 shows another embodiment of the driving machine according to the present invention.

The driving machine shown in FIG. 3 is different from the above embodiment in that the lower end of the push lever 6 is pressed by the head of the stopper 16 to raise the push lever 6. It is formed by an upper push lever 6a extending to the four front ends and a lower push lever 6b shaped to cover the outer periphery of the lower end of the injection unit 4.

The upper push lever 6a is entirely coated with a cushioning member 11 made of synthetic resin.

In this embodiment, similarly to the above-described embodiment, the impact force 15 applied to the push lever 6 can be absorbed and reduced each time the driving operation is performed, and the life of the push lever 6 can be improved or the productivity can be improved. It is possible to achieve the effect of being able to achieve this.

The cushioning member 11 is desirably a thermoplastic adhesive such as urethane or phenoxy among synthetic resins. This is because the film is soft and elastic and has advantages such as peeling, impact, and bending stress as compared with the thermosetting adhesive in the same synthetic resin system.

Further, a synthetic rubber adhesive which has advantages such as easy adhesion and relatively high resistance to peeling, impact and fatigue may be used.

The buffer member 11 may be coated not only on the upper push lever 6a but also on the lower push lever 6b. In this case, the impact force 15 applied to the push lever 6 can be further absorbed and reduced.

In the driving machine having the structure shown in FIG. 3, the upper push lever 6a and the
A configuration in which a cushioning member 11 made of an elastic member is provided at a coupling portion with the lower push lever 6b may be adopted.

FIG. 5 shows a stress waveform applied to the push lever 6 when a driving operation is performed in a state where the stopper 16 is clogged in the injection section 4 as shown in FIG. (A) shows a stress waveform applied to the push lever of the driving machine of the present invention,
(B) shows a stress waveform applied to the push lever of the conventional driving machine.

As shown in the figure, the waveform of (a) is clearly smaller than that of (b), and it can be seen that the impact force 15 applied to the push lever 6 is absorbed and reduced by the buffer member 11.

Further, as shown in FIG. 4, a test was conducted in which a driving operation was performed in a state where the stopper 16 was clogged in the injection section 4, and in the case of the push lever 6 of the conventional configuration subjected to the low-temperature heat treatment, Although a slight notch was observed on the surface in the driving test of about 200 rods, similarly, in the case of the push lever 6 of the present invention in which the low temperature heat treatment was applied and the cushioning member 11 was coated on the entire surface, 200 In the degree of the driving test, no notch was observed, and it was confirmed that the impact force 15 applied to the push lever 6 was absorbed and reduced.

[0034]

According to the present invention, a buffer member made of an elastic substance is provided on at least a part of the push lever.
The impact force applied to the push lever is absorbed and mitigated, so that it is possible to provide a driving machine which can improve the life of the push lever or improve the productivity.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing an operating state of a push lever constituting the present invention.

FIG. 3 is an enlarged sectional view of a main part showing another embodiment of the driving machine of the present invention.

FIG. 4 is an enlarged sectional view of a main part showing an operating state of the driving machine.

FIG. 5 is a graph showing a waveform of a stress applied to the push lever when the stopper is clogged.

[Explanation of symbols]

1 is a main body, 4 is an injection part, 5 is a trigger, 6 is a push lever, 7 is a spring, and 11 is a buffer member.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Kikuchi 1060 Takeda, Hitachinaka-shi, Ibaraki F-term in Hitachi Koki Co., Ltd. (reference) 3C068 DD01 DD18 FF01 JJ03

Claims (4)

[Claims] 1. A drive bit for rapidly moving down inside the body and driving a fastener such as a nail, a nose portion for guiding the drive bit up and down, a trigger for controlling the drive of the drive bit, and safety of the trigger A driving device having a push lever extending from the vicinity of the trigger to the lower end of the nose portion, wherein at least a part of the push lever is provided with a buffer member made of an elastic material. . 2. The push lever according to claim 1, wherein the push lever is divided into an upper push lever and a lower push lever, and the upper push lever and the lower push lever are connected via a buffer member. The driving machine described. 3. The driving machine according to claim 1, wherein said cushioning member is made of a mucus-based material containing an adhesive, and is coated on a surface of a push lever. 4. The driving machine according to claim 3, wherein the composition of the cushioning member is a thermoplastic adhesive or a synthetic rubber adhesive.