JPS5826774Y2 - impact tool - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a striking tool used for tightening nuts and the like.

Although various tools of this kind have existed in the past, they have had drawbacks such as structural defects that can cause major parts to seize up and correct malfunctions.

Therefore, the purpose of this invention is to solve the above-mentioned problems and provide a convenient impact tool that can prevent failures.

Hereinafter, the configuration of this invention will be explained according to the drawings shown as examples.

First, as shown in FIG. 1, a shaft 2 is provided at the center of the case 1 and rotated by an air motor (not shown) placed at the rear of the case 1. A main shaft 3 is provided in front of the shaft 2. It extends to the front end inside the case 1.

Then, place it inside the case 1 and attach it to the shaft 2...
The rear part of the hammer frame 4 is fitted, and the hammer frame 4 holds the hammer 5 in its front half.

Further, the hammer frame 4 has a hole 6 formed in a portion of its rear half, as shown in FIG. 3, in which a cam pin 7 is rotatably housed.

As shown in FIG. 2, this cam pin 7 has two annular grooves 8, 8, and a plurality of balls 9 are held by the grooves 8.8.

Further, a cam body 11 having a protrusion 10 is disposed between the hammer 5 and the main shaft 3.
is fitted onto the main shaft 3, and a portion of its rear surface is in contact with the outer peripheral surface of the tip of the cam pin 7.

Next, an anvil 12 is placed in the front part of the case 1,
A notch 13 is formed on the rear surface, and a box receiver 14 protruding outside the case 1 is connected to the front.

Furthermore, a horizontal hole in the center of the anvil 12 is fitted with the front half of the main shaft 3, and the tip of a spring 16 comes into contact with a step 15 formed on the wall surface of the anvil 12, and this spring 16 It abuts against a backing plate 17 glued to the front surface of the case 5 and presses it backward.

Next, the usage state of the impact tool according to the invention having the structure as described above will be explained.

First, when the shaft 2 is rotated by a motor (not shown), this rotational movement is transmitted to the hammer frame 4 fitted on the shaft 2, and therefore the cam pin 7 disposed in the hole 6 of the hammer frame 4 is rotated. The hammer frame 4 also rotates together with the hammer frame 4.

At this time, as described above, since the outer peripheral surface of the tip of the cam pin 7 is in contact with a part of the rear surface of the cam body 11, the cam body 11 is rotated, and therefore the main shaft 3 fitted with the cam body 11 is rotated. rotates, and the anvil 12 fitted to the main shaft 3 further rotates.

The above is a normal operating state, but next, when the tightening of nuts etc. is started, a load is applied to the anvil 12 and normal rotation stops, and the cam body 11, main shaft 3 and anvil 12 rotate once. will be interrupted.

Then, the cam pin 7 has its tip outer peripheral surface connected to the cam body 11.
By engaging with the rear surface of the main shaft 3, it is possible to rotate about an axis perpendicular to the main shaft 3 and at the same time rotate about the main shaft 3.

At this time, the cam body 11 stops and turns the button, and therefore the cam pin 7
The outer circumferential surface of the distal end thereof comes to engage with the protrusion 10 of the cam body 11, and the cam body 11 and the cam 5 are pushed forward against the pressing force of the spring 16 and rotate.

At this time, the protrusion 18 of the hammer 5 engages with the notch 13 of the anvil 12 and rotates, so the anvil 12 is rotated and tightened.

The outer peripheral surface of the tip of the above-mentioned cam pin 7 and the protrusion 1 of the cam body 11
The bonding with 0 is repeated intermittently, so that the anvil 12
Even if the cam pin 7 rotates intermittently, if the cam pin 7 rotates about an axis perpendicular to the main shaft 3 in the hole 6 of the hammer frame 4, the ball 9 will fit into the annular groove 8 formed in the cam pin 7. is arranged, the friction with the wall surface of the hole 6 is significantly reduced, and the structure is such that failures due to seizure or the like are prevented.

As mentioned above, this invention provides a striking tool that is convenient to use and can prevent failures of major parts, and has excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the main parts of the impact tool according to this invention;
Figure 2 is a front view of the cam pin. AH in FIG. 3 is a front view of the hammer frame. B is a longitudinal sectional view thereof. C is a rear view. A in FIG. 4 is a side view of the cam body.

Claims (1)

[Scope of utility model registration request] A shaft 2 rotated by a motor is provided in the case 1, and a hole 6 is formed therein, and a mer frame 4 supporting the mer 5 at the front is mounted on the shaft 2.
An annular groove 8 is formed in the hole 6, and this groove 8
A cam pin 7 that accommodates a plurality of balls 9 is disposed in the shaft 2, and a rear surface having a protrusion 10 of a cam body 11 that fits into the main shaft 3 provided at the front of the shaft 2 is joined to the outer circumferential surface of the tip of the cam pin 7. A blow el characterized by