JPH0329111Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a bolt caulking tool that caulks the threaded portion of a bolt to prevent loosening of a nut screwed into the bolt.

[Conventional technology]

Figure 2 shows the hub 10 of the vehicle and the drum 1 of the wheel.
2 is shown. The bolts 14 are fixed by welding to the flange of the hub 10, and the drum 12 has holes 3 formed therein at equal angular intervals.
6 through a bolt 14 and attached to the hub 10. Nuts 16 are threaded onto bolts 14 to tighten drum 12 to hub 10. After tightening the nut 16 onto the bolt 14, in order to prevent the nut 16 from loosening, tighten the threaded portion of the bolt 14 at the boundary with the nut 16 at two points 18 that are 180 degrees apart, as shown in FIG. Close. In that case, the second
As shown in the figure, the punch 20 is held obliquely so that the tip of the punch 20 hits the location 18, and the upper end of the punch 20 is struck with the hammer 22.

[Problem that the invention attempts to solve]

In such conventional techniques, (1) the tip of the punch 20 cannot be accurately positioned because the position to be caulked is determined visually; (2) the caulking position on the peripheral wall side of the drum 12 does not The surrounding wall becomes a hindrance for positioning the punch 20 and caulking 2
(3) The quality of caulking varies greatly depending on the person. (4) It takes a lot of man-hours because caulking is formed one by one. (5) Punch 20
Since the tip of the punch 20 is not fixed, there is a problem that the life of the punch 20 is short.

The purpose of this invention is to provide a bolt crimping tool that solves the above problems.

[Means for solving problems]

The bolt caulking tool according to this invention includes a holder that is attached to the tip of the threaded part of the bolt and receives the nut screwed into the bolt, and a holder that is movable diagonally toward the threaded part of the bolt. It has a plurality of crimping pins arranged therein, and a slap bar which supports the holder so as to be movable in the axial direction, has one end hit with a hammer, and has the other end abutted against the rear end of the crimping pins. A first spring biases the swage pin away from the threaded portion of the bolt, and a second spring biases the slap bar toward one end thereof.

[Effect]

The holder is attached to the tip of the threaded portion of the bolt until its lower surface touches the reference surface.

Next, hammer one end of the slap bar. This causes the slup bar to move towards the other end against the second spring, and the lower part of the slap bar moves the swage pin against the first spring towards the threaded part of the bolt at the interface with the nut. Push it in.

As a result, the tip of the caulking pin comes into contact with the threaded portion of the bolt, and a caulking is formed at the threaded portion of the bolt at the boundary with the nut to prevent the nut from loosening.

[Effect of idea]

By aligning the lower surface of the holder with the reference surface, caulking can be formed at an accurate position in the axial direction of the threaded portion of the bolt, and the life of the caulking pin can be maintained for a long time.

There is no need to hold the punch diagonally with respect to the bolt, which requires a large space, and the caulking is formed by driving a long slap bar in the axial direction of the bolt, so it can be used when there are obstacles near the bolt, such as the peripheral wall of a drum. It is also possible to form caulking without any problem.

Since the caulking can be easily formed at an accurate position, it is possible to prevent variations in the quality of caulking caused by people.In addition, by attaching the holder to the tip of the threaded part of the bolt and nailing one end of the slap bar, A plurality of caulks can be formed at the same time, and the number of man-hours can be reduced.

〔Example〕

This invention will be explained below with reference to the illustrated embodiment.

In FIG. 1, the holder 24 has a fitting hole for receiving the nut 16 at the lower part, and two swage pins 26 are arranged 180 degrees apart from each other.
The bolt 14 is accommodated in the holder 24 so as to be movable obliquely (arrow 27) with respect to the threaded portion of the bolt 14 so as to come into contact with the threaded portion at the tip. The first compression coil spring 28 is disposed between the tapered tip of the caulking pin 26 and the inwardly protruding portion of the lower part of the holder 24, and the first compression coil spring 28 moves in a direction in which the caulking pin 26 moves away from the threaded portion of the bolt 14. The caulking pin 26 is urged. The slap bar 30 is disposed coaxially with the holder 24, and supports the shaft portion of the holder 24 at its lower portion so as to be relatively movable in the axial direction (arrow 31). Further, the slap bar 30 has the holder 24 partially inserted into the lower tapered recess and is in contact with the hemispherical rear end of the crimping pin 26. The second compression coil spring 32 is connected to the holder 2
4, and is disposed between the tapered recess at the bottom of the slap bar 30 and the holder 24, and urges the slap bar 30 upward. In addition, 34 is the holder 2 from the outer periphery of the slap bar 30.
4, the holder 24 and the slap bar 30
22 is a hammer that is driven into the upper end of the slap bar 30.

The operation of the embodiment will be explained.

Until the bottom surface of the holder 24 hits the reference surface 38,
A holder 24 is attached to the tip of the threaded portion of the bolt 14. To form the reference surface 38, a spacer of a predetermined thickness is fitted around the outer periphery of the nut 16 and placed on the surface of the drum 12 (FIG. 2). In Figure 1, the right half shows the bolt caulking tool set;
The left half shows the state at the time of caulking formation. In the set state, the caulking pin 26 is separated from the threaded portion of the bolt 14 due to the first compression coil spring 28.
The slap bar 30 is in an upper position due to the second helical compression spring 32.

Next, the upper end of the slap bar 30 is struck with the hammer 22. As a result, as shown in the left half of FIG.
2, and the tapered recess at the bottom of the slap bar 30 presses against the hemispherical rear end of the crimping pin 26, causing the crimping pin 26 to move against the first compression coil spring 28. Move it toward the threaded part of the bolt 14. As a result, the caulking pin 26
The tip of the bolt 14 at the boundary with the nut 16
At two points 18 separated by 180° from each other, as in the case of Fig. 3,
A caulk is formed to prevent the nut 16 from loosening.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of a bolt caulking tool according to an embodiment of this invention, Figure 2 is a diagram showing a conventional bolt caulking method, and Figure 3 shows the position of caulking formed using the bolt caulking tool. It is a diagram. 14... Bolt, 16... Nut, 22... Hammer, 24... Holder, 26... Caulking pin, 2
8...First compression coil spring, 30...Slap bar, 32...Second compression coil spring.

Claims (1)

[Scope of utility model registration request] a holder attached to the tip of a threaded portion of the bolt to receive a nut screwed into the bolt; and a holder disposed within the holder so as to be movable toward the threaded portion of the bolt diagonally with respect to the threaded portion. a plurality of caulking pins; a first spring that biases the caulking pins in a direction away from the threaded portion of the bolt;
a slap bar that supports the holder movably in the axial direction, has a hammer at one end and abuts the rear end of the caulking pin at the other end; and a second flap bar that urges the slap bar toward the one end. A bolt caulking tool characterized by having a spring.