JPS5845011Y2 - impact wrench - Google Patents

Description

[Detailed description of the invention] This invention relates to an impact wrench for tightening bolts.The purpose of the invention is to accurately tighten bolts that are automatically fed in a fixed direction by a bolt feeder etc. using the tip of the impact wrench. This allows the bolts to be tightened continuously without having to manually insert the bolts into the screw holes.

Embodiments of the present invention will be described below with reference to the drawings.

1 is the impact wrench body.

A cylindrical shaft 2 is attached to the impact wrench main body 1 so as to be movable forward and backward, and is always pressed forward by a spring 3.

Inside the cylindrical shaft 2 is a socket shaft 4 which is connected to and rotates with an air motor provided in the impact wrench body 1, and the cylindrical shaft 2 moves relative to this socket shaft 4 in the axial direction.

5 is a socket recessed at the tip of the socket shaft 4;
Fits into the head of the bolt and applies tightening torque to the bolt.

A bushing rod 6 is fitted into the axial center of the socket shaft 4 so as to be slidable in the axial direction, and is always pressed forward by a spring 7.

The tip of the bushing rod 6 is positioned to protrude from the tip of the socket shaft 4, and the protruding portion is formed with an inclined guide surface 6a for controlling the attitude of the bolt in the direction of a gripping claw, which will be described later.

8 is a guide groove recessed in the axial direction on the outer peripheral surface of the bushing rod 6, and 9 is a stopper pin that engages in the guide groove 8.

Furthermore, a gripping claw 11 for gripping the threaded portion of the cylindrical shaft 2 is attached to the tip of the cylinder shaft 2 so as to be openable and closable.

Reference numeral 12 denotes an elastic O-ring that constricts and contracts the gripping claw 11 in the closing direction.

Further, a bolt supply passage 10 facing in the direction of the gripping claw 11 is provided, and a pneumatic pipe 13 connected to a bolt feeder is connected to the bolt supply passage 10.

14 is a bolt supply instruction switch installed at the tip of the impact wrench body 1, and when the protruding member 15 protruding from the cylindrical shaft 2 comes into contact with or approaches, the bolt feeder is supplied with bolts for the next tightening. It is a command.

Next, the operation of the present invention will be explained.

Upon completion of the Pol tightening work, the switch 14 is closed as described above.
This commands a bolt feeder (not shown) to supply the bolt for the next tightening.

Pneumatic pipe 13 and bolt supply passage 1 from the bolt feeder
0 and is fed by pressurized air, insert its screw part into the gripping claw 11, and insert the tip of the threaded part into the gripping claw 1.
1 and the head H is held facing the distal end surface of the socket shaft 4.

At this time, the inclined guide surface 6a is attached to the protruding end of the bushing rod 6.
In the case where the bolt B coming out of the bolt supply passage 10 is guided by resting on the inclined guide surface 6a, the posture of the threaded portion is controlled toward the gripping claw 11 side.

This provides reliable attitude control, especially in the case of bolts with relatively short threaded lengths.

In the state shown in the figure, when the threaded end of Pole B is inserted into the screw hole and the impact wrench body 1 is pressed, the cylinder shaft 2 and the impact wrench body 1 compress the spring 3 and move relative to each other, and the socket shaft 4 moves forward together with the bush rod 6.

As a result, first of all, the protruding tip surface of the bushing rod 6 is
Contact with the head H of H, apply force in the extrusion direction to Pole B,
Next, in this state, the socket shaft 4 moves forward and moves relative to it to compress the spring 7, and the socket 5 is fitted into the head H.

Due to this action, the head H of Pol) B pushes the gripping claw 11 open, and the head H escapes from the gripping claw.

Thereafter, by rotating the air motor, a tightening torque is applied to the socket shaft 4, and the socket shaft 4 is tightened into the screw hole.

When this tightening is completed, the switch 14 contacts or approaches the protruding member 15 and instructs the bolt feeder to supply bolts for the next tightening, and sends the bolts to the bolt supply passage 1 through the pneumatic pipe 13.
Force feed at zero speed.

That is, when bolts are tightened, the outlet of the bolt supply passage 10 is blocked by the socket shaft 4, so the supplied bolts are waiting in the bolt supply passage 10.

Then, by releasing the compression of the impact wrench body 1 after bolt tightening is completed, the cylindrical shaft 2 is returned to the forward end by the spring 3.

Due to the relative movement with the socket shaft 4, the exit of the bolt supply passage 10 is opened, and the waiting bolt is further pressure-fed and inserted into the gripping claw 11 and held there.

As described above, the impact part of the impact wrench according to the present invention uses the tip of the bushing rod to correctly control the posture of the bolt that is automatically fed from the bolt feeder in the tightening direction, and holds it in the gripping claw that can be opened and closed. This ensures reliable bolt tightening at all times.

This effect is particularly noticeable in the case of bolts with short lengths, which are difficult to control.

In addition, when tightening a bolt, the impact wrench body is pressed and the bolt that is in contact with the screw hole is held down by the bushing rod, so the bolt is steadily pushed out from the gripping pawl without being drawn in and broken, and the socket is attached to the bolt. Since it fits securely into the head, it has the advantage of greatly improving the workability of bolt tightening.

[Brief explanation of drawings]

The figure is a sectional view of the main parts of the present invention. 1... Impact wrench body, 2... Cylindrical shaft, 3...
・Spring, 4... Socket iIt 5... Socket, 6... Bush rod, 6a... Inclined guide surface, 7... Spring, 10... Bolt supply passage,
11...Gripping claw.

Claims (2)

[Scope of utility model registration request] (1) A cylindrical shaft that is always pressed forward by a spring is provided in the impact wrench body so that it can move forward and backward with respect to the impact body, and within the cylindrical shaft is a socket shaft that is rotated by an air motor and slides in the axial direction around the socket shaft center. A bushing rod that can be inserted and inserted freely and is always pressed forward by a spring and protrudes from the end of the socket shaft is provided inside, and a gripping claw that can be opened and closed for gripping the threaded portion of the bolt is provided at the tip of the cylindrical shaft. The impact wrench also includes a bolt supply path toward the gripping claw. (2) The impact wrench according to claim 1, which is a registered utility model, wherein an inclined guide surface is formed on the protruding tip of the bushing rod to control the posture of the bolt fed from the bolt supply passage in the direction of the gripping claw.