JPS629002Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a socket device for holding a tightening screw of a bolt or the like using a screw tightening wrench, that is, an impact type transmission wrench or the like.

Conventionally, this type of socket device is generally attached to a screw tightening wrench so that the socket can float. Therefore, due to the floating function, the core of the screw held at the tip of the socket becomes unstable, and
In particular, if the screws are installed at an angle, misalignment will occur, and it will be inconvenient to align the screws with the set screw-in position.

In some cases, a resilient spring is applied to the back of the socket, but the above-mentioned disadvantages remain the same.

The present invention eliminates the above-mentioned conventional inconveniences and disables the floating function before the tightening process in sockets that have a floating function so that the position of the tip of the screw is stabilized and faces the threaded part. Sometimes the floating function is used to make the screwing work smoother, and the socket 3 that holds screws at the tip is slid in the axial direction of the shaft 2 against the drive shaft 2 of the screw tightening wrench 1. The spring 4 is applied to the spring 4, which covers the socket 3 and attaches it to the tip of the screw tightening wrench 1. A receiving step 5a formed on the inner circumferential surface of the front end of the cover 5 and urging the front end to protrude, and a receiving surface 5 formed on the inner circumferential surface of the cover 5 at the rear with a gap therebetween.
By bringing the outer surface of the socket 3 into contact with each of the outer surfaces of the socket 3 and the drive shaft 2, the socket 3 is held parallel to and approximately concentrically with the drive shaft 2. A clearance 9 is formed between them, and a clearance 10 is also formed on the sliding surfaces of the socket 3 and the drive shaft 2.

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

In the drawings, reference numeral 1 designates a known impact unit, in which a socket 3 having a concave portion at its tip for holding a nut-shaped head piece of a bolt a slides in the axial direction with respect to a drive shaft 2, and rotates integrally with the shaft 2. Pin 7 passed through long hole 6 of shaft 2
is attached to the socket 3, and a resilient spring 4 is attached between the rear end of the socket 3 and the tip of the screw tightening wrench 1.
By interposing the socket 3, the socket 3 is always pressed forward and the front end of the socket 3 is made to protrude from the front end of the cylindrical cover 5 which covers the socket 3 and is fixed to the front end of the screw tightening wrench 1.

Furthermore, a magnet piece 8 is attached to the inner bottom of the recess at the front end of the socket 3.
was installed to ensure the retention of vault a.

A receiving step 5a is formed on the front inner circumferential surface of the cylindrical socket 5, that is, the inner circumferential surface of the tip in the illustrated example, and a receiving surface 5a is formed protrudingly on the inner circumferential surface of the cover 5 at the rear with a gap therebetween. At the position where the socket 3 is pushed forward by the force of the spring 4, the outer surface of the socket 3 is brought into abutting contact with the receiving stage 5a and the receiving surface 5b, respectively, thereby making the socket 3 parallel to and approximately concentric with the drive shaft 2. In this case, the receiving stage 5a
When the abutting portion between the socket 3 and the cover 5 is formed into a conically tapered surface as shown in the illustrated example, centering is automatically performed.

In addition, the sliding surfaces of the cover 5 and the socket 3, as well as the sliding surfaces of the socket 3 and the drive shaft 2, other than the receiving stage 5a and the receiving surface 5b of the cover 5, have clearances 9, which can allow floating action. 10 was formed.

The operation of the present invention will now be explained.

Before the screw tightening operation, the socket 3 is pressed forward by the force of the elastic spring 4 as shown in FIG. A receiving stage 5a and a receiving surface 5b are held parallel to and concentrically with the axis of the wrench 1.
The floating function is restricted due to butt contact between the two. Therefore, when holding the vault a at the tip of the socket 3, it is easy to insert it, and there is less chance of the installation being tilted and causing misalignment, etc.
Also, when moving the screw tightening wrench 1 forward toward the workpiece C, floating does not occur, so the vault a
The tip can reach the correct setting position. Next, by pressing against the screwed part b of the workpiece C, the socket 3 moves back against the spring 4 as shown in FIG.
When the abutting contact part of the socket 3 separates from the socket 3, the restraint of the floating function is released, and the floating function is released according to the amount of the clearance 9 between the socket 3 and the inner peripheral surface of the cover 5 and the clearance 10 between the socket 3 and the shaft 2. For example, as shown in FIG. 1, when the reaching position of the vault a slightly deviates from the threaded part b during the forward movement of the screw tightening wrench 1, or when the vault a is slightly tilted and the threaded part b Even when there is misalignment, the error is corrected by floating action and the tightening work is reliably performed.

In this way, according to the present invention, the floating function of the socket 3 is restrained inactive before the start of the tightening work, and during the tightening work, the restraint is automatically released to utilize the floating function. It is possible to hold the screws at the start of work and set them in the correct working position, and even if there is an error in the position of the tip of the screw with respect to the screwed part during work, it can be corrected by floating action. It has the effect of being able to screw in accurately while making corrections.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a half-cut side view of the main part, and FIG. 2 is a side view of the main part, and FIG.
A line sectional view, and FIG. 3 is a half-cut side view of the main part showing the screwing operation state. 1... Screw tightening wrench, 2... Drive shaft,
3... Socket, 4... Resilient spring, 5... Cylindrical cover, 5a... Receiving stage, 5b... Receiving surface, 9, 10...
...play space.

Claims (1)

[Scope of utility model registration request] A socket 3 for holding screws at the tip of the drive shaft 2 of the screw tightening wrench 1 is provided so as to slide in the axial direction of the shaft 2 and engage with the shaft 2 so as to rotate together with the shaft 2. The spring 4 acts to urge the front end of the socket 3 to protrude from the tip of the cylindrical cover 5 that covers the socket 3 and is fixed to the tip of the wrench 1, and also to force the front inner peripheral surface of the cover 5 to protrude from the tip of the cylindrical cover 5. By bringing the outer surface of the socket 3 into contact with a receiving step 5a formed at the top and a receiving surface 5b formed on the inner circumferential surface of the cover 5 at a rear spaced apart from the receiving step 5a, the socket 3 is aligned substantially parallel to the drive shaft 2. The receiving stage 5 is held concentrically.
a. A screw tightening wrench in which a clearance 9 is formed between the socket 3 and the cover 5 at positions other than the receiving surface 5b, and a clearance 10 is also formed on the sliding surface between the socket 3 and the drive shaft 2. socket device.