JPH09109059A - Exhaust cover for pneumatic nailing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of an exhaust cover coming off an exhaust part at the time of receiving high exhaust pressure by forming this exhaust cover, fittingly mounted on a side wall part of a cylinder head, of soft material, forming the lower end part of the exhaust cover small, and making exhaust pressure act upon the upper face of a small diameter part. SOLUTION: In a pneumatic nailing machine, a cylinder head 15 rises in cylindrical shape at the upper part of an impact cylinder 4, and an exhaust cover 22 is rotatably fitted and mounted on the upper and lower edge parts 16, 17 of the cylinder head 15. The exhaust cover 22 is formed of soft material such as urethane rubber. The exhaust cover 22 is fitted from the outside of the peripheral surface parts of the upper and lower edge parts 16, 17 and mounted in the state of the lower engaging edge of the lower end part being engaged with the engaging groove of the lower edge part 17. The lower end part diameter of the exhaust cover 22 is formed small. When the exhaust pressure of the impact cylinder 4 acts upon the upper face of the lower engaging edge, the exhaust pressure is applied to the exhaust cover 22, and the cylinder head 15 is energized downward to prevent the slip-off of the exhaust cover 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic nailing machine, in which a striking piston driven to strike a nail by compressed air is released by the pressure of exhaust gas discharged from a striking cylinder when returning to an initial position. About the exhaust cover that never.

[0002]

2. Description of the Related Art Generally, a pneumatic nailing machine comprises a striking cylinder for slidably accommodating a striking piston for nail striking and a driver integrally connected to the striking piston. The screwdriver is reciprocated by supplying and exhausting the striking piston, striking the nail supplied to the injection part when the striking piston moves forward, and exhausting the exhaust gas discharged from the striking cylinder to the atmosphere from the exhaust part of the cylinder head when returning. Although it is to be released, the exhaust pressure is high,
There is a configuration in which an operator can change the exhaust direction so as not to be affected by the exhaust pressure during work. This is because the exhaust cover is rotatably covered on the outside of the exhaust part,
The exhaust port is formed in the exhaust cover, and the exhaust direction is adjusted by appropriately rotating the exhaust cover.

[0003]

However, since the conventional exhaust cover is made of a soft plastic and is simply formed into a short tubular shape, the exhaust cover bulges out when it is subjected to a high exhaust pressure, and is removed from the exhaust section. There were times when it happened.

An object of the present invention is to solve the above-mentioned drawbacks and to provide an exhaust cover of a pneumatic nailing machine which does not come off due to exhaust pressure.

[0005]

In order to solve the above-mentioned problems, an exhaust cover of a pneumatic nailing machine according to the present invention is erected on a hitting cylinder for driving nails and exhausted from the hitting cylinder to a side portion. Is an exhaust cover of a short-cylinder pneumatic nailer fitted and attached to a side wall of a cylinder head having an exhaust port for exhausting the exhaust port, the exhaust cover being formed of a soft material and having a lower end portion thereof. Is formed to have a small diameter, and the exhaust pressure exhausted from the striking cylinder through the exhaust port acts on the upper surface of the small diameter portion.

[0006]

1 is a longitudinal sectional view of a pneumatic nailing machine, in which reference numeral 1 indicates a body, 2 indicates a grip, and 3 indicates a magazine. The body 1 has a striking cylinder 4 and a striking cylinder 4
A striking piston 6 that is slidably accommodated in the striking piston 6 and has a driver 5 integrally connected thereto, and compressed air in an air chamber 7 (which is connected to a compressed air supply source) is supplied to and discharged from the striking cylinder 4. A head valve 8 that drives and controls the striking piston 6 is arranged. A nose portion 9 is provided at the tip of the body 1, and the driver 5 is guided so as to slide inside the nose portion 9. The tip of the magazine 3 is opened in the nose portion 9, and the nail 10 in the magazine 3 is configured to be supplied to the nose portion 9.

At the time of nail driving, the trigger valve 12 is operated by operating the trigger lever 11 at the base of the grip 2, and the head valve 8 is moved upward in conjunction with this to control so that the upper end of the striking cylinder 4 is opened. As a result, the compressed air in the air chamber 7 is supplied into the striking cylinder 4 and drives the driver 5 together with the striking piston 6 to strike the nail in the injection part and drive it into the material to be driven. After that, the trigger valve 12 is actuated again by releasing the trigger lever 11, and the head valve 8 is further moved downward to actuate the impact cylinder 4 to be closed as shown in FIG. 1. At the same time, the impact cylinder 4 is connected to the atmosphere. Then, the striking piston 6 is returned to the initial position and the next nail driving operation is prepared. The mechanism for controlling the driving of the nail driving machine by the operation of the trigger valve 12 and the head valve 8 is the same as the known one.

Next, as shown in FIG. 2, a cylinder head 15 is erected in a cylindrical shape above the striking cylinder 4. The upper end of the cylinder head 15 is closed, and the upper and lower edges 16 of the upper and lower ends of the intermediate side wall are closed.
And the lower edge portion 17 are formed so as to correspond to a disc shape. An exhaust passage 18 is formed at the center of the upper portion of the head valve 8 and opens above the striking cylinder. The head valve 8 is connected to the exhaust passage 18 on the side wall of the cylinder head 15 according to the vertical movement. An exhaust port 19 (inner exhaust port) that opens and closes is formed.

The lower peripheral portion of the upper edge portion 16 of the cylinder head 15 is formed in a polygonal shape (decagonal shape), and 12 engaging recesses 20 are formed between the upper edge portion 16 and the upper portion. On the other hand, an engaging groove 21 is formed on the peripheral surface of the lower edge portion 17.

An exhaust cover 22 is rotatably fitted and attached to the upper edge 16 and the lower edge 17 of the cylinder head 15. The exhaust cover 22 is made of a soft material such as urethane rubber, and as shown in FIGS. 3 (a) and 3 (b), the exhaust cover 22 has an overall short tube shape, but the inner surface is polygonal (decagonal) at the upper end. And a triangular upper engaging edge 23 is formed. Further, a lower engaging edge 24 is formed at the lower end of the exhaust cover 22 so that its diameter becomes smaller. Further, an outer exhaust port 26 is formed in the exhaust cover 22. It should be noted that the outer peripheral surface of the exhaust cover 22 is formed with an uneven portion 25 for preventing slippage. Then, as shown in FIG. 2, the exhaust cover 22 is fitted from the outside of the peripheral surface portions of the upper edge portion 16 and the lower edge portion 17, and the lower engaging edge 24 of the lower end portion thereof is engaged with the engaging groove 21 of the lower edge portion 17. The upper engaging edge 23 is engaged with the engaging concave portion 20 to be mounted.

According to the above construction, the compressed air supplied into the striking cylinder 4 along with the returning movement of the striking piston 6 after the nail driving operation is conducted from the exhaust passage 18 formed in the upper portion of the cylinder head 15 of the striking cylinder 4 to the inside. The outer exhaust port 26 formed through the exhaust port 19 and further on the exhaust cover 22
Released into the atmosphere from Then, the exhaust cover 22 can be rotated to change the direction of the outer exhaust port 26 to select the exhaust direction. At this time, the engagement stop 20 of the upper edge portion 16 and the engagement edge 23 of the upper end of the exhaust cover 22 are engaged with each other to stop rotation for suppressing a free rotation at constant rotation angles.

By the way, since the diameter of the lower end portion of the exhaust cover 22 is formed small, the exhaust pressure from the striking cylinder 4 acts on the upper surface of the lower engaging edge 24,
Since the pressure receiving areas of the upper end portion and the lower end portion of the exhaust cover 22 are larger on the upper surface of the small diameter portion (the lower engaging edge 24) of the lower end portion, the exhaust cover 22 is moved downward (see FIG.
(In the direction of the arrow), that is, it is urged to be pressed below the cylinder head 15, so that the exhaust cover 22 is not disengaged by the exhaust pressure.

The exhaust cover 22 and the cylinder head 1
The engagement between the upper and lower edge portions 16 and 17 of 5 is not limited to the peripheral surface portion.
It is sufficient that the exhaust cover can be engaged and mounted, and it may be the peripheral surface or the peripheral portion thereof.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a nailing machine according to the present invention.

FIG. 2 is an enlarged view of an exhaust cover portion of the nail driver.

3 (a) and (b) are plan views of the exhaust cover and its AA.
Cross section on line

[Explanation of symbols]

 4 Impact Cylinder 15 Cylinder Head 16 Exhaust Port (Inner Exhaust Port) 22 Exhaust Cover 24 Lower Engagement Edge (Small Diameter Portion)

Claims (1)

[Claims] 1. A pneumatic cylinder-shaped pneumatic cylinder which is mounted on a side wall portion of a cylinder head which is set up on a hammering cylinder for driving nails and has an exhaust port for discharging exhaust gas from the hammering cylinder on its side. An exhaust cover for a nailing machine, wherein the exhaust cover is formed of a soft material, and the lower end portion thereof is formed to have a small diameter, and the exhaust pressure exhausted from the striking cylinder through the exhaust port is the small diameter portion. Exhaust cover for pneumatic nailing machine characterized by acting on the upper surface of.