JPH0226624Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a tightening tool used for tightening bolts and the like.

(Prior Art) Conventionally, in a screw tightening process on an automobile assembly line or the like, a tightening tool having a nut runner equipped with a socket is used. And the workers
It is common to work by holding the tightening tool continuously from the beginning of tightening to the end of tightening. In addition, as another tightening tool, the nut runner can be incorporated into another handling device and tightened fully automatically.
In some cases, the setting to the tightening part is done manually, and the holding, tightening, and removal of the tightening tool from the tightening part is done automatically.

(Problem to be solved by the invention) However, in the former case, the former technique has to be held by hand from the beginning to the end of tightening, so there is a problem that other work cannot be done during tightening, and in the latter case, Although the former problem has been solved, the entire device is large and requires a large installation space, resulting in high cost, and furthermore, there are problems in that the tightening part is restricted.

The present invention was developed in view of the problems existing in the prior art described above, and has a simple structure that allows other work to be done during the tightening time, and a mechanism that receives the reaction force exerted on the tool by the tightening torque. The object of the present invention is to provide a tightening tool that is built-in and is designed to improve productivity and safety.

(Means for solving the problem) In order to solve the above problem, the configuration of the present invention is as follows.
A socket is attached to the output shaft of a nut runner whose output shaft is taken out in a direction perpendicular to the main shaft, and one end of a first bracket extending parallel to the axis of the socket is fixed to the nut runner, and the socket is fixed to the nut runner at right angles to the first bracket. A second bracket arranged parallel to the nut runner is slidably attached to the first bracket, and the second bracket is supported by a cylinder device fixed to the nut runner, and is arranged opposite to the socket. U to avoid interference with the screw member extending on the back side of the object to be tightened at the tip of the second bracket extended to the part where the
It is characterized by having a letter-shaped notch.

(Function) With this configuration, during tightening work, the distance between the nut runner and the second bracket is shortened by the operation of the cylinder device, and the object to be tightened is placed between the socket and the second bracket. can be pinched, and even if you release your hand from the nut runner, the nut runner will not separate from the tightened object. Furthermore, when the nut runner turns around the tightening part due to the tightening reaction force, the first bracket interferes with the object to be tightened and restricts the turning of the nut runner.

(Example) An example of the present invention will be described below based on the drawings.

In Figures 1 to 3, the nut runner 1
A first bracket 3 is attached with bolts 4 via a mounting plate 2. An output shaft (not shown) extends from one end of the nut runner 1 in a direction perpendicular to the main shaft.
is taken out, and a socket 5 is attached to this output shaft. This embodiment is for tightening a bolt 6 that fastens a collar 13 to a vehicle body (an object to be tightened) 7, and when the socket 5 engages with the head of the bolt 6, the first bracket 3 is attached to the body. The mounting position of the first bracket 3 is adjusted so as to be close to the side edge a of the bracket 7. A nut 8 is fixed to the first bracket, and a rod 10 of a cylinder device 9, which will be described later, is screwed into the nut and fixed with a nut 11. One part of the second bracket 12 is fixed to the cylinder device 9, and the other side thereof is U-shaped so that it can be inserted between the dimensions b of the body 7. Note that the second bracket 12 is provided with an insertion hole 12a, and the first bracket 3 is inserted into the insertion hole 12a.
2a and holds the second bracket 12 and the cylinder device 9.

A collar 13, which is a vehicle component, is attached to the body 7 having a U-shaped cross section, and the collar 13 is attached by tightening bolts 6. 14
is a case nut that wraps around the outside of the nut 15 and is fixed to the body 7.

Reference numeral 16 indicates a valve operation unit for operating the nut runner 1 and the cylinder device 9, which includes a manual valve 17, a throttle valve 18 with a check valve, and a switching valve 1.
9 and an air source 20. In addition, 2
1 indicates a start lever.

Next, the operation of this embodiment will be explained.

First, the apparatus is set on the body 7 in the state shown in FIG. Next, operate the manual valve 17 to switch to the B side. As a result, air is supplied to the B side of the cylinder device 9 through the check valve equipped throttle valve 18. Moreover, at the same time, it is also supplied to the switching valve 19 and switched to the B side. As a result, the socket 5 rotates, and the nut runner 1 is pulled toward the bolt 6 by the cylinder device 9.
Bolt 6 is inserted into socket 5 and tightened. In this state, the body 7 is sandwiched between the socket 5 and the second bracket 12 due to the tensile force of the cylinder device 9, so that even if the nut runner 1 is released, the nut runner 1 remains held by the body 7. Next, when the tightening torque increases, a reaction force of the tightening torque is applied to the nut runner 1, and the nut runner 1 attempts to rotate around the axis of the bolt 6. However, since the first bracket 3 has a predetermined width as shown in FIG. 3, it hits part a of the body 7 and absorbs this reaction force. Rotation stops.

Next, when the tightening is completed, the nut runner 1 is grasped by hand and the manual valve 17 is switched to the A side. As a result, the switching valve 19 is also switched to the A side,
The supply of air to the socket 5 is stopped, and
A throttle valve 18 with a check valve is installed on the A side of the cylinder device 9.
Air is supplied through the rod 10 of the cylinder device 9, and the rod 10 of the cylinder device 9 moves forward as shown by arrow C. However, in reality, the cylinder device 9 moves backward until the second bracket 12 hits the collar 13, and when it hits the collar 13, the knuckle 8 is moved back to the rod 10 of the cylinder device 9.
The nut runner 1 can be separated from the bolt 6 by being pushed by the forward movement of the nut runner. In the case of this operation, the start lever 21 of the nut runner 1 is always urged by an external force (not shown) and is in the open state.

(Effects of the invention) As described above, according to the invention, since the screw is held on the object to be tightened from the beginning to the end of tightening, other work can be done during this tightening time, improving productivity. I can accomplish it. Moreover, since the structure is simple, the reaction force of the tightening torque can be received by this device, so that work safety can be improved. Further, it is possible to more easily manufacture a semi-automatic device in which the setting is done manually and the reset is done automatically.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a side view showing the state of use, FIG. 2 being a side view, and FIG. 3 being a front view. DESCRIPTION OF SYMBOLS 1... Nut runner, 3... First bracket, 5... Socket, 9... Cylinder device, 10
... Rod, 12 ... Second bracket, 16...
...Valve operation section.

Claims (1)

[Scope of utility model registration request] A socket is attached to the output shaft of a nut runner whose output shaft is taken out in a direction perpendicular to the main shaft, and one end of a first bracket extending parallel to the axis of the socket is fixed to the nut runner, and the socket is fixed to the nut runner at right angles to the first bracket. Further, a second bracket disposed parallel to the nut runner is slidably attached to the first bracket, the second bracket is supported by a cylinder device fixed to the nut runner, and a second bracket is attached to the socket. A tightening tool characterized in that a U-shaped notch is provided at the tip of the second bracket extending to the opposing portion to avoid interference with a screw member extending on the back side of the object to be tightened.