JPS6154550B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air hammer for driving a pin into a member to be driven.

For example, an air hammer using compressed air is used to drive a round bar-shaped locking pin for positioning and fixing into a locked member.
A conventional air hammer is shown in FIG. 1, and includes a gun-shaped hammer body 1 and a chisel 3 elastically connected to the hammer body via a spring 2. The hammer body 1 includes a piston 5 that reciprocates within the hammer cylinder 4 by compressed air.
It also includes a grip 6, and a press switch 7 for cutting off the supply of air to the grip 6.
is attached, and air is supplied into the hammer body 1 via the supply pipe 8.

The piston 5 pushes the rear end 3a of the chisel 3 and hits the lock pin P with the tip 3b of the chisel 3, thereby inserting it into the lock pin insertion hole H formed in the member W to be locked.

However, before using this air hammer, it is not only necessary to temporarily push the lock pin P into the pin insertion hole H by hitting it with a one-handed hammer, but also to completely push the lock pin P into the pin insertion hole H. In order to swage the entrance of the pin insertion hole H to prevent it from coming out after insertion, it is necessary to hit the swage punch with a one-handed hammer, which has the drawback of being extremely complicated and having poor work efficiency. It was hot.

In view of these points, the present invention connects a guide cylinder to the front end of the hammer main body via an elastic body, forms an insertion hole for a pin to be driven in at the front end of the guide cylinder, and forms a caulking hole around the insertion hole. forming an edge,
In addition, by inserting the chisel into the guide tube so that it can move back and forth, and by providing a regulating means to restrict the forward limit of the chisel, driving the pin and caulking around the pin insertion hole can be done simultaneously, using a one-handed hammer or a caulking punch, etc. The purpose is to provide an air hammer that is unnecessary and has good workability.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5. In addition, the same reference numerals are given to the parts common to the parts in FIG. 1.

In FIG. 2, the air hammer of the present invention is supplied with compressed air.
The hammer body 1 is equipped with a hammer cylinder 4 housing a piston 5 and a grip 6 for an operator to hold the air hammer.The front of the grip 6 has a hole for supplying and cutting compressed air. Press switch 7
is installed.

A guide tube 10 for guiding the chisel 9 is connected to the tip of the hammer tube 4 so as to be detachable from the guide tube 10 by a coil spring 11. A spring receiving groove 12 for mounting a coil spring 11 is provided on the outer periphery of the hammer cylinder 4 and the outer periphery of the large diameter portion 10a of the guide cylinder 10.
13 is formed.

The chisel 9 has a large diameter portion 9a formed in the middle thereof, and a rear end portion 9b that extends from the large diameter portion 9a toward the piston 5 and is struck by the piston 5.
and a tip portion 9c which extends forward from the large diameter portion 9a and transmits the reciprocating motion of the piston to the lock pin P to strike the lock pin P.

The large diameter portion 9a of the chisel 9 slides within the large diameter portion 10a of the guide tube 10, and a shoulder portion 14 is formed on the guide tube 10 as a contact portion against which the front surface of the large diameter portion 9a comes into contact. A sharp edge 15 for caulking the entrance of the pin insertion hole H of the locked member W is formed at the tip of the small diameter portion 10b of the guide tube 10, and a locking pin is formed at the tip inside the small diameter portion 10b. A part of 9 is stored and held.

Next, the operation will be explained with reference to FIGS. 3 to 5. Before driving the lock pin P, as shown in FIG. Insert until it touches part 9c. Thereby, the work of temporarily inserting the lock pin P into the pin insertion hole H before using the hammer can be omitted. At this time, the press switch 7 is released, so compressed air is not sent and the piston 5 does not operate. When the pressure switch 7 is pressed from this state to supply compressed air into the hammer body 1, the chisel 9 is struck by the piston 5 and vibrates from side to side. As a result, the lock pin P is gradually inserted into the pin insertion hole H of the locked member W (see FIG. 4).

When the lock pin P is completely inserted into the pin insertion hole H, the large diameter portion 9a of the chisel 9 comes into contact with the shoulder 14 in the guide tube 10, and thereby the guide tube 10 is inserted into the hammer tube 4. Moving away from the tip, the sharp edge 15 caulks the entrance of the pin insertion hole H and finally prevents the lock pin P from slipping out (see FIG. 5). Therefore, the pin insertion work and the caulking work are performed at the same time. At this time, the guide tube 10 vibrates left and right due to the action of the coil spring 11 as the piston 5 moves left and right, causing the tip of the hammer tube 4 to move toward and away from the guide tube 10 .

As described above, the present invention connects a guide cylinder detachably to a hammer body having a hammer cylinder housing a piston that reciprocates with air using an elastic member, and connects the guide cylinder to the tip of the guide cylinder. A chisel that transmits the reciprocating motion of the piston to the inserted pin and drives the pin into the driven member is built into the guide cylinder, and a contact part on which the chisel comes into contact with the guide cylinder is formed. Since an etch is formed at the tip of the guide tube to swage around the pin insertion hole of the member to be driven, the work of temporarily inserting the pin before using the hammer can be omitted, and the pin insertion and swage work can be performed at the same time. This eliminates the complexity of the pin insertion work and significantly improves work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a partially cut-away side view of a conventional air hammer, FIG. 2 is a partially cut-away side view of the air hammer of the present invention, and FIGS. 3, 4, and 5 illustrate the operation of the present invention. It is a longitudinal cross-sectional view of an air hammer for explanation. 1... Hammer body, 4... Hammer tube, 5... Piston, 9... Chisel, 10... Guide tube, 14
...shoulder, P...pin.

Claims (1)

[Claims] 1. A guide tube is connected to the front end of the hammer body via an elastic body, and an insertion hole for a pin to be driven is formed at the front end of the guide tube, and an edge for caulking is formed around the insertion hole. An air hammer for driving a pin, characterized in that a chisel is inserted so as to be movable back and forth, and a regulating means for regulating the forward limit of the chisel is provided.