JPS58137568A - Pneumatic pressure type striking tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pneumatic impact tool, and more particularly to a pneumatic impact tool having a safety device.

In general, pneumatic impact tools are widely used for securing and fixing building boards, particularly interior materials for houses, floorboards, etc., with nails or the like.

However, pneumatic impact tools use compressed air to forcefully and instantaneously drive fasteners, such as nails, into the member to be fastened. Confirmation is necessary, and in addition, it is important to install some kind of safety device to prevent the risk of incorrect operation. It had been requested.

It takes l! Traditionally, as a response to the so-called
As shown in the figure, there is a contact part 2 that is slidably attached to the tip of the nose part 1, an abbreviated arm 6 that has one piece fixed to this contact part 2, and a design that allows the arm 6 to move up and down. 9 a suppressed piston 4, a cylinder 5 in which the piston 4 slides, a spring 6 urging the piston 4 downward within the cylinder 5, and a rod 7 implanted in the piston 4. , one end is pivotally supported by the lower end of the trigger part 8, and the other end is rotated by being pressed by the rod 7,
A link mechanism is formed by the arm 9 for opening the trigger pulp 10, and the trigger pulp cannot be opened by simply operating the trigger, and the contact portion 2t is pressed against the wrinkle-preventing member and moved back to the side. A safety device is used in which the trigger valve can be opened for the first time and the striking piston is driven.

An object of the present invention is to provide a pneumatic impact tool equipped with a safety device having a new configuration, unlike such conventional safety devices.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

FIG. 2 is a longitudinal section showing the internal structure of the pneumatic nailing machine 11 when it is not in operation. Case It of the above nailing machine 11
A percussion cylinder 12 is built in the inside, and a percussion piston 13 is contained within this percussion cylinder 12. A head pulp mechanism 14 is provided above the striking piston 16. This head pulp machine 11114
It consists of a head valve cylinder 15, a head pulp piston 16 slidably fitted into the cylinder, and a spring 17 biasing the head pulp piston 16 upward. The upper part of the head valve cylinder 15 is provided with an opening at one end of a passage 19 for discharging compressed air in the head pulp cylinder upper chamber 18 to the outside.
is in communication with the compressed air outlet 2o. In addition, a supply port 22 for compressed air from the air chamber 21 is provided at the bottom of the head valve cylinder 15 that forms a partition wall with the main air chamber 21.
It is closed by a head pulp screw ton 16. Furthermore, a dry/<23 is integrally attached to the striking piston 16. The tip of the driver 26 is located within a bore 24 formed at the lower end of the striking cylinder 12.

On the other hand, a main air chamber 21 that supplies working air to the striking piston 16 is formed surrounding the striking cylinder 12, and the main air chamber 21 is supplied with working air from a working air source located outside the pneumatic striking tool. Supplied.

Further, a return air chamber 21' is provided below the main air chamber 21, and communicates with the inside of the L9 blowing cylinder 12 through a return air passage 25.

A piston pulp mechanism 26 is provided within the main air chamber 21 at a position slightly away from the impact cylinder 12. This piston pulp mechanism 26 is provided with a piston valve cylinder 27, a piston valve 28, and a piston valve cylinder 27, and the piston valve 28 is provided within the piston valve cylinder 27.
A passage R1 for introducing compressed air from the main air chamber 21 into the piston valve cylinder 27 is formed at the lower end of the piston valve 28. When not in operation,
The piston valve 28 is pressed upward by compressed air from the main air chamber 21. On the other hand, the upper end of the piston valve 28 is slidably fitted into the compressed air discharge port 20, and is connected to the 017 ring 28' fitted on the outer circumference of the piston valve 28 above the outlet of the rainbow passage 19. The compressed air discharge port 20 is closed.

A trigger valve mechanism 60 is provided below the piston pulp mechanism 26. This trigger pulp Iso @
50ri, as shown in an enlarged view in FIG. A hole 64 communicating with the piston valve cylinder 27 is formed in the clay wall of the trigger pulse 7° cylinder 61.

On the other hand, an O-ring 65 is fitted into an annular groove formed on the outer periphery of the )'J Gabal 7'' piston 62.
The O-ring 65 connects the trigger pulp piston 62 and
The space between the peripheral wall and the trigger balloon cylinder 61 is closed.

Furthermore, an air valve mechanism 67 is attached and fixed to the two-piece V-t 56 on the front side of the nose grate serving as a nose portion. The air pulp 1a structure 67 has a stepped portion 68 inside.
An air valve cylinder 68 and an air valve piston 59 having an air valve cylinder 68 and an air valve piston 59, a member 40 having a substantially trapezoidal cross section that is formed integrally with the air pulp piston 69 and slightly protruding forward of the nose plate 66, and The guide member 40 is provided with a spring 41 that always urges the air pulp piston 69 downward.
C. It has a notch 40' with a radius that can fit into a convex portion formed on the member to be attached.

Further, a compressed air passage R2 is provided between the air pulp cylinder 68 and the trigger pulp cylinder 61. One end of this passage R2 forms an opening 42 provided on the circumferential wall of the trigger pulp cylinder 61, and the other end forms an opening 46 provided on the circumference of the air valve cylinder 67. , the opening 4 provided in the circumference 11 of the trigger pulp cylinder 61
2 and the upper chamber 61' of the trigger pulp cylinder are dialyzed by the trigger pulp 62.

Therefore, as shown in FIG.
When the trigger 44 is pulled to activate KFi, the trigger 44 presses the trigger pulp piston 62 from below, and the trigger pulp piston 52 moves upward within the trigger pulp cylinder 61. Due to this movement of the trigger valve piston 62, the opening 42 in the wall of the trigger pulp cylinder 61 and the trigger pulp upper chamber 611 are brought into communication, and compressed air is placed between the trigger pulp cylinder 61 and the air pulp cylinder 68. A passage R2 is formed.

Therefore, the air pressure of the compressed air in the main 1 Attende Yamba 21 is applied to the passage R1, the hole 64, and the compressed air feed jll.
Apply to the air pulp cylinder 67 by Rzt&. In this case, since the piston pulp 28 remains pressed upward by the compressed air 4CjC, the head valve °16
The compressed air outlet 20 above the outlet of the compressed air passage 19 that presses the main air chamber 2 downward remains closed by the piston pulp 28.
The compressed air supply port 22 from 1 remains blocked by the head pulp 16, and the percussion piston 16 does not operate.

However, as shown in FIGS. 4 and 5, when the guide member 69 is pressed against the protrusion of the stopper member, the r
Yo, Air Pulp Pist/69 Ni Air Valp Cylinder 68
When the piston head 44 and the air pulp cylinder inner circumferential wall 45 move upward and pass the step 68', the barrier F between the piston head 44 and the air pulp cylinder inner peripheral wall 45 is
J46 occurs. The compressed air in the trigger pulp cylinder upper chamber 61' via the air pulp cylinder 68 and the passage Kzk is discharged to the outside of the pneumatic nailing machine from the above-mentioned gap 1!1146.

Therefore, the air pressure inside the piston pulp 7 cylinder 27 decreases rapidly, and the piston pulp 28 moves downward due to the biasing force of the piston valve 28.
The upper skin portion moves downward within the compressed air discharge hole 20, and the passage 19 and the compressed air discharge port 20 communicate with each other, so that the compressed air in the head pulp cylinder upper chamber 18 is discharged to the outside of the tool.

Therefore, due to the +j force of the head pulp 16 and the spring 17, the inner metal of the head pulp cylinder 15 moves to the nigga,
The compressed air supply port 22 from the air chamber 21, which had been blocked by the lower part of the head pulp 16, is opened, and as a result, compressed air is supplied from the air chamber 21 into the blow cylinder 12, and the compressed air is The striking piston 16 is driven by the air pressure, and the driver 26 slides downward within the driver guide of the nose plate 25 to strike the nail 4.
7 into the member to be attached.

Further, in the 11th driving stroke of the striking piston 16,
When the piston is moving toward the first dead center, the air t in the lower chamber 51 of the striking piston passes through the return air passage 25 and is accumulated in the return air first yang bar 21'. In that case, the part that opened the trigger valve piston 62 has 3 #s of air flowing out from the passage R2 for every trigger pulp piston wave! The air pressure inside the piston pulp cylinder 27 increases and presses the piston pulp 28 upward. Therefore, the piston pulp 28 is forced upward inside the piston/bulb renoder 27, and at the upper end of the piston pulp 28, the ring 28' fitted around the outer periphery of the piston pulp opens the passage 19. Move upward. At this time, the air pressure in the main air chamber 21 reaches the upper chamber 18 of the head valve through the gap and passage 19t formed between the peripheral wall of the air outlet 20 and the piston pulp 28,
Press the head pulp 16 downward. head pulp 16
C. The tool moves downward in the head pulp cylinder 15, closes the air supply port n, and the pulp 48 provided at the center of the head pulp is opened, and the compressed air between the upper chambers of the striking piston is supplied to the tool from the compressed air discharge port 49. Released to the outside. Therefore,
The air pressure in the return air chamber 21 reaches the striking piston lower chamber 51 through the return air passage 25, presses the striking piston 16 upward, and the striking piston 16 returns to the top dead center.

In this embodiment, we will use a case where the present invention is applied to a pneumatic nailer as an example. However, the present invention is not limited to this, and can be applied to any device having a mechanism for driving a fastening tool into a fastening tool using air pressure.

Further, a flat base 1152 is mounted on the lower frame of the pneumatic nailer so that its mounting position can be moved in the front and back direction;
Driving position adjustment tool 5 consisting of this base portion 52 and a holding portion 55 that is integrally formed via a connecting portion 56 and abuts against the reference curve of the adhered member to maintain the driving position of the nose plate older brother.
6 may be attached with a screw so that the position at which it is driven into the member to be attached 57 can be adjusted.

Since the present invention has the above configuration, even when a fastener such as a nail is driven from the 1011 surface of a member to be fastened such as flooring using a pneumatic impact tool, the safety device becomes an obstacle. In addition, the guide member that maintains the proper driving position on the adhered member can be integrated with the safety device, allowing for accurate driving work. This makes it possible to Furthermore, since it is based on air control, unlike safety devices that utilize mechanical elements such as link mechanisms, it is possible to reliably prevent recreational operations.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the structure of a safety device of a conventional pneumatic impact tool, FIG. 2 is a vertical cross-sectional view showing the internal structure of the pneumatic impact tool according to the present invention when it is not in operation, and FIG. FIG. 4 is an enlarged sectional view showing the internal structure of the trigger pulp mechanism of the pneumatic impact tool according to the present invention when it is not in operation; FIG. 4 is a sectional view showing the internal structure when the pneumatic impact tool according to the invention is in operation; FIG. 5 is an enlarged sectional view showing the internal structure of the trigger pulp mechanism of the pneumatic impact tool according to the present invention during operation. 11... Pneumatic impact tool 16... Impact piston 2
8... Piston pulp A... Nose part (Nose play 67... Air pulp mechanism 44... Trigger % Applicant Sanyo Kogyo Co., Ltd. Drawing; '7+F) (No change in content) Figure 1 Figure 2 ■ Figure 3 Figure 4 5mm Procedural amendment 0be) June 1981 patent I'ig! Tochiku - Mr. Kazuo l Indication of the case Showa era patent application No. 1! 0441 2, 4th title of invention Pneumatic percussion machine ^ 3. Relationship with the case of the person making the amendment Patent applicant Representative Takeo Yamagishi 4. Agent〒10!111118110-1111
No. 31 application form, detailed statement, and cabinet MLO manuscript (no changes due to inactivity).

Claims (1)

[Claims] - In a pneumatic impact tool that discharges air pressure applied to a piston pulp by operating a trigger and drives a percussion piston in conjunction with the operation of the piston pulp, the air pressure applied to the piston pulp is discharged when the trigger is operated. A pneumatic impact tool, characterized in that the tool is discharged by operating an air pulp mechanism that is movably provided near a nose portion and forms an air discharge port when retracting.