JPH0537474U - Fixing device for impact cylinder of pneumatic nailer - Google Patents

Abstract

(57) [Summary] [Structure] The cylinder seal member 8 mounted on the upper end of the striking cylinder 7 can be engaged with the lower surface of the head valve 15, and the striking is performed via a flange portion extending from the lower end of the cylinder seal member 8. Cylinder 7 to cylinder cap 2
It was fixed by the rib-shaped protrusions 6. [Effect] The cylinder seal member 8 is the head valve 15
Has a cushioning function for engaging in the opening and closing of the striking cylinder 7 and for absorbing a manufacturing error of the parts by interposing between the flange of the striking cylinder 7 and the rib-like protrusion 6 of the cylinder cap 2. Can be fulfilled. Therefore, the impact cylinder seal and the cushion for fixing the impact cylinder, which are conventionally composed of two parts, are combined into one.
It can be manufactured by integral molding of one member, and the man-hours for assembling the parts can be reduced to reduce the cost.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fixing device for fixing a striking cylinder accommodating a striking piston for striking a nail in a slidable manner in the body of a nailing machine.

[0002]

[Prior art]

 Generally, a striking cylinder in a pneumatic nailing machine of this type has a flange portion formed on the outer periphery of the upper end of the striking cylinder from the cylinder cap side, as disclosed in Japanese Utility Model Laid-Open No. 57-059076. It is fixed by pressing with rib-shaped protrusions that project toward In this case, in order to absorb the manufacturing error of each of the above-mentioned components, it is necessary to interpose a cushion member made of an elastic material such as rubber between the flange portion and the rib-shaped protruding portion.

Further, as disclosed in Japanese Utility Model Publication No. 61-3593, in order to improve the sealing performance of a head valve that introduces and discharges compressed air to and from a striking cylinder, an elastic material such as rubber is attached to the upper end of the striking cylinder. A configuration in which a cylinder seal member made of a material is attached is known.

By the way, in order to make these functions compatible with each other, it is necessary to separately form the cushion member and the cylinder seal member and to assemble them separately, which results in an increase in component cost and assembly cost, resulting in an overall increase. The cost will be high.

[0005]

[The purpose of the device]

 It is an object of the present invention to provide a striking cylinder fixing device which solves the above-mentioned drawbacks and which can simultaneously realize manufacturing error of parts for fixing a striking cylinder and sealing of a head valve at low cost. To aim.

[0006]

[Means for Achieving the Purpose] In order to achieve the above-mentioned object, a fixing device for a striking cylinder according to the present invention mounts a striking cylinder slidably accommodating a striking piston for nail striking in a nailing machine body. The upper end opening of the nailing machine body is closed by a cylinder cap, and a head valve for introducing and discharging compressed air to and from the striking cylinder is arranged above the striking cylinder so as to be vertically movable. In the nail driving machine, a cylinder seal member that can engage with the lower surface of the head valve is attached to the upper end of the striking cylinder, and the outer peripheral surface of the cylinder seal member is integrally formed so as to project outward in the radial direction. A flange portion formed on the outer peripheral surface of the striking cylinder, and the flange portion of the cylinder seal member. To the top surface, prior SL is brought into contact with the lower end of the rib-like projections formed to project downward of the cylinder cap is characterized in that to fix the previous SL striking cylinder.

[0007]

[Function and effect of the device]

 According to the above construction, the cylinder seal member attached to the striking cylinder fulfills a sealing function when the striking cylinder is opened and closed by engaging the head valve, and the rib-like protrusions of the striking cylinder flange and the cylinder cap. And a cushioning function that absorbs a manufacturing error of a component by interposing between and. Therefore, the impact cylinder seal and the cushion for fixing the impact cylinder, which conventionally consisted of two parts, can be manufactured by integral molding of one member, which can reduce the cost of parts and the number of parts assembling steps. Assembly cost can be reduced.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an upper part of a pneumatic nailing machine, and 1 is a nailing machine body. The upper end of the nailer body 1 is open, and this opening is closed by a cylinder cap 2. An exhaust port 3 is formed in the cylinder cap 2 and an exhaust cover 4 is attached. An annular recess 5 is formed on the lower surface of the cylinder cap 2, and a rib-shaped protrusion 6 is formed below. Below the annular recess 5, a striking cylinder 7 having an open upper end is mounted. A projecting portion 7a is formed on the upper end of the striking cylinder 7 so as to project outward, and a cylindrical cylinder seal member 8 is fitted into the fitting groove on the inner peripheral side of the projecting portion 7a. It is installed. The cylinder seal member 8 is made of an elastic material such as urethane rubber, and a flange portion 9 is integrally formed so as to project from the lower end portion of the outer peripheral surface thereof in the outer diameter direction.

The lower end and the side surface of the striking cylinder 7 are supported by the inner wall surface of the nailing machine body 1. That is, the lower end of the striking cylinder 7 is supported by a step portion (not shown) formed in the lower part of the inner wall surface of the nailing machine body 1, and the side surface is supported by the inner wall surface of the nailing machine body 1 via the annular body 11. There is. The lower end and the side surface of the striking cylinder 7 may be supported by other known appropriate means. On the other hand, the upper end of the striking cylinder 7 is fixed by the rib-shaped projection 6 of the cylinder cap 2 via the cylinder seal member 8. That is, a flange portion 12 is formed on the outer peripheral surface of the upper part of the striking cylinder 7, the flange portion 9 of the cylinder seal member 8 is superposed on the upper surface of this flange portion, and the rib-like projection of the cylinder cap 2 is further formed thereon. The lower end 6a of the portion 6 is in contact. In this way, the cylinder seal member 8 is interposed between the flange 12 of the striking cylinder 7 and the rib-shaped protrusion 6 of the cylinder cap 2 to fix the striking cylinder 7, and therefore, the manufacturing error of these parts is prevented. It can play a cushioning function.

Next, a striking piston 14 in which a nail striking driver 13 is integrally connected is slidably accommodated inside the striking cylinder 7. An annular head valve 15 for introducing and discharging compressed air to and from the striking cylinder 7 is disposed above the striking cylinder 7 so as to be movable up and down. The head valve 15 is supplied and discharged by operating a start valve (not shown). The upper and lower annular bodies 15a, 15b and 15c are superposed on each other and are integrally connected to each other. A compression spring 17 is arranged between the upper surface of the formed flange 16 and the exhaust cover 4. Then, the upper end of the cylinder seal member 8 mounted on the upper end of the striking cylinder 7 is disposed so as to be engageable with the lower surface of the head valve 15 and seals between the striking cylinder 7 and the head valve 15 at the time of engagement to strike. The upper end opening of the cylinder 7 is completely closed.

An air chamber 19 is formed between the inner wall surface of the nailing machine body 1 and the striking cylinder 7, and compressed air supplied from an external compressed air supply source is stored in the air chamber 19. ing. The outer peripheral edge of the lower surface of the head valve 15 faces the air chamber 19, and the compressed air in the air chamber 19 acts on the lower surface of the head valve 15, so that the head valve 15 resists the spring force of the compression spring 17. It is biased upward.

Next, a pair of upper and lower diaphragm seals 18 and 20 are arranged between the outer peripheral side of the head valve 15 and the inner peripheral side of the annular recess 5, and a space between the upper and lower diaphragm seals 19 and 20. The portion S is open to the air passage 21 communicating with a start valve (not shown) and the upper surface of the head valve 15.

With the above configuration, when compressed air is supplied to the air passage via the start valve, the compressed air is supplied from the space S between the diaphragm seals to the upper surface of the head valve 15, and the head valve 15 is Due to the working pressure of the compressed air and the spring pressure of the compression spring 17, the lower surface is urged downward against the working pressure of the compressed air in the air chamber 19, and the lower surface thereof engages with the upper end of the cylinder seal member 8 and strikes. The upper end opening of the cylinder 7 is closed. On the other hand, when the start valve is operated to evacuate the compressed air supplied to the air passage, the air pressure to the head valve 15 suddenly decreases, so the pressure balance between the upper and lower surfaces of the head valve 15 is reversed, and the pressure balance of FIG. Thus, the head valve 15 moves upward and separates from the cylinder seal member 8. As a result, the upper end opening of the percussion cylinder 7 opens into the air chamber 19, and compressed air is rapidly introduced into the percussion cylinder 7 to drive the percussion piston 14. At this time, the upper end of the moved head valve 15 contacts the lower surface of the exhaust lid 4, and the exhaust port 3 is closed. Then, by supplying compressed air into the air passage again by the start valve to move the head valve 15 downward and engage the lower surface thereof with the cylinder seal member 8 at the upper end of the striking cylinder 7, the upper end of the striking cylinder 7 is The opening is closed to the air chamber 19 and communicates with the exhaust port 3 to exhaust the compressed air inside. This completes the nail driving work.

A protrusion 22 is formed on the inner peripheral side of the upper end of the cylinder seal member 8, and an engaging portion 23 that engages with the protrusion 22 is formed on the outer peripheral surface of the upper end of the piston. .. As a result, when the striking piston reaches the top dead center position, the projection 22 and the engaging portion 20 engage with each other, and the striking piston is held at the top dead center position. In the usual case, a locking mechanism is formed on the side of the striking piston and the cylinder cap 2. However, in this case, since it is not necessary to form a separate mechanism, the structure is simplified and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an upper portion of a body of a pneumatic nailer shown together with a striking cylinder fixing device according to the present invention.

FIG. 2 is an explanatory view of an operating state of a striking piston of the nail driver.

[Explanation of symbols]

 1 Nailer body 2 Cylinder cap 6 Impact cylinder 8 Cylinder seal member 9 Flange part 12 Flange part 15 Head valve

Claims (1)

[Scope of utility model registration request] 1. A striking cylinder accommodating a striking piston for striking a nail slidably is mounted in a nailing machine body, and an upper end opening portion of the nailing machine body is closed by a cylinder cap. A pneumatic nailing machine in which a head valve for introducing and discharging compressed air to and from the striking cylinder is arranged above and below the striking cylinder so that the upper end of the striking cylinder can be engaged with the lower surface of the head valve. While mounting a different cylinder seal member, the flange portion integrally formed in the outer peripheral surface of the cylinder seal member from the lower end portion of the outer peripheral surface is formed overhanging on the upper surface of the flange portion formed on the outer peripheral surface of the striking cylinder. Further, the lower end of the rib-shaped protrusion formed below the cylinder cap is brought into contact with the upper surface of the flange portion of the cylinder seal member. Fixing device of the striking cylinder of pneumatic nailing machine, characterized in that fixing the striking cylinder.