JPS6322060Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a socket used in an automatic bolt tightening device, and more particularly to a floating socket that can cope with misalignment between the bolt and the screw hole.

(Prior Art) Conventionally, sockets used in automatic bolt tightening devices are generally fixedly attached to the tightening device, and therefore, if there is misalignment between the bolt and the screw hole, the socket may not work properly. There was a risk that this could result in poor tightening.

For this reason, some devices have been devised that correct center misalignment through a flexible mechanism (Japanese Utility Model Publication No. 55-85275), but in this device, the flexible mechanism is a ball joint, elastic It has a complex structure combining parts, etc., and there are unstable factors in terms of price, maintainability, durability, reliability, etc.

(Purpose of the invention) In view of the problems of the prior art described above, the object of the present invention is to provide a floating socket for bolt tightening that has a simple structure and can effectively cope with misalignment between the bolt and the screw hole.

(Structure of the invention) This object includes a bottomed cylindrical socket holder fixed to a drive shaft and a rod-shaped socket body having a bolt gripping portion at the tip, and the socket holder and the socket body are aligned in the axial direction. This is achieved by a bolt tightening socket which can be fitted at both ends and whose socket body can be floated relative to the socket holder.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

1 and 2 show the structure of a floating socket for tightening bolts according to the present invention. In the figure, reference numeral 1 denotes a bottomed cylindrical socket holder fixed to the drive shaft of an automatic tightening device (not shown), and the socket holder 1 has a small diameter part 2 and a large diameter part 3 from the base end to the distal end. , holder fitting portion 4 are formed in this order. 5 is the shaft-shaped socket body,
A shaft bearing head 6 on the base end of which the small diameter portion 2 can be slid.
However, a socket fitting part 7 that can be fitted into the holder fitting part 4 is formed in the middle, and a bolt gripping part 8 is formed at the tip, and the two are connected by small diameter shaft parts 9a and 9b.

Thus, elongated holes 10, 10 are formed at appropriate locations in the socket holder 1 so as to face each other in the radial direction of the shaft, and on the other hand, a through hole 11 is also formed in the shaft bearing head 6 of the socket body 5.
is drilled. And, the socket body 5 is
It is inserted into the large diameter part 3 of the socket holder 1 with the elongated hole 10 and the through hole 11 aligned in phase, and then the elongated hole 1
The socket holder 1 is connected to the socket holder 1 by a pin 12 inserted through the socket holder 0 and the through hole 11.

Here, the shaft bearing part 6 comes into contact with the large diameter part 3 of the socket holder 1 at the top part 6a of the curved surface as appropriate.
Further, the pin 12 is also in contact with the wall surface of the through hole 11 at the top 12a of the curvature surface, and the other part is connected to the wall surface of the through hole 11.
This provides a margin for fitting. As a result, the socket main body 5 can slide in the axial direction relative to the socket holder 1 by the length of the elongated hole 10, cannot rotate around the axial center, and can rotate in the radial direction. In addition, socket holder 1
Covers 13, 13 for preventing the pin 12 from coming off are attached facing the elongated hole 10.

Reference numeral 14 denotes a compression spring interposed between the bottom surface of the socket holder 1 and the base end of the socket body 5, which constantly urges the socket body 5 forward to engage the pin 12 with one end of the elongated hole 10. It stops at the aligned position, and at this time, connect the socket fitting part 7 to the boulder fitting part 4.
It will be in a state where it is fitted.

A magnet 15 is housed in the bolt gripping portion 8 of the socket body 5, and a bolt 18 having, for example, a spring washer 16 and a flat washer 17 attached thereto, is attracted and gripped by the magnet 15.

With such a configuration, as shown in FIG. 3, when the object 21 to be fastened is to be fastened with the bolt 18 to the member 20 to which the nut 19 is fixed in advance,
The member 20 and the object to be fastened 21 are positioned and set at predetermined locations on the automatic tightening device, and the socket body 5 is made to grip the bolt 18 to rotate and move the socket holder 1 forward. At this time, socket holder 1
Since the holder fitting part 4 and the socket fitting part 7 are fitted, the socket body 5 and the socket body 5 are in a concentric state A, and this axis A is now aligned with the set member. If the axis B of the nut 19 of No. 20 coincides with the axis B of the nut 19, the bolt 18 and the nut 19 will be screwed together without any problem, and the automatic tightening of the object to be fastened 21 will be easily executed.

As shown in FIG. 3, the axis A of the socket holder 1 and the socket body 5, that is, the bolt 1
8 and the axis B of the nut 19 are misaligned, the tip of the bolt 18 will hit the nut 19 as shown in FIG. 4, and the repulsive force will cause the socket body 5 to It moves rearward relative to the socket holder 1 moving forward. As a result, the holder fitting part 4 and the socket fitting part 7 are disengaged, and
The socket body 5 is in a floating state.

After that, as the socket holder 1 continues to rotate, the bolt 18 moves onto the nut 19 in search of a stable position, as shown in FIG. This will start the process. At this time, the axis A' of the socket body 5 and therefore the nut 19 is inclined with respect to the axis A of the socket holder 1, but since the inclination is usually very small (about 2 degrees), the bolt 18 Screwing into the nut 19 can now be carried out without any difficulty.

(Effects of the invention) As explained above in detail, the present invention is such that the socket body that grips the nut is supported in a floating manner by the socket holder fixed to the drive shaft. Even if there is a slight misalignment between the bolt and the screw hole on the fastened object side, the floating socket body will absorb this, allowing the bolt to be tightened without any problems. The effect that can be obtained was obtained. In addition, by absorbing the misalignment, the working range of the automatic tightening device has been expanded, and its more efficient use has been realized.

Furthermore, this floating socket has a simple structure and requires a small number of parts, making it less likely to break down, increasing durability and reliability, and being able to be manufactured at a low cost.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the structure of the floating socket for bolt tightening according to the present invention, Fig. 2 is a sectional view taken along the - arrow line in Fig. 1, and Figs. 3 to 5 are the floating socket of the present invention. FIG. 1... Socket holder, 4... Holder fitting part,
5... Socket body, 6... Bearing top, 7... Socket fitting part, 10... Oblong hole, 12... Pin, 1
4...Compression spring.

Claims (1)

[Scope of utility model registration request] It comprises a bottomed cylindrical socket holder fixed to the drive shaft and a rod-shaped socket body having a bolt gripping part at the tip, and the socket holder and the socket body have a fitting part that can be freely fitted and removed in a part in the axial direction. , the base of the socket body is supported on the socket holder so as to be slidable in the axial direction, non-rotatable around the axis, and rotatable in the radial direction, and the socket body is supported at the base end of the socket body. A compression spring interposed between the socket holder and the bottom surface of the socket holder allows
A floating socket for tightening bolts, characterized in that it is always biased to fit into the socket body.