JPS6242189Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a movement prevention device for a coil spring resonance prevention cover. Generally, when a coil spring is used in a place where there is vibration, a coil spring resonance prevention cover is used to prevent resonance of the coil spring, and the resonance prevention cover is tightly fitted inside or outside the coil spring. A coil spring resonance prevention cover that prevents resonance by friction with a coil spring is known. If the coil spring resonance prevention cover is simply made into a cylindrical shape, the coil spring resonance prevention cover will move in the axial direction or rotate relative to the coil spring, and eventually the resonance prevention cover will fall off from the coil spring or its function will be significantly impaired. There was a drawback that it was not able to fully demonstrate its function due to reduced capacity. SUMMARY OF THE INVENTION An object of the present invention is to provide a device for preventing movement of a coil spring resonance prevention cover in which the resonance prevention cover of a coil spring does not move or rotate relative to the coil spring using extremely simple means.
Fig. 1 shows a conventional cylindrical coil spring resonance prevention cover, and Fig. 2 shows a movement prevention device for a coil spring resonance prevention cover filed by the applicant of the present application (Utility Application No. 55-029205). This is a device for preventing movement of a coil spring. In the case of a resonance prevention cover for a coil spring that is simply formed into a cylindrical shape in FIG. 1, the resonance prevention cover 2 moves or rotates in the axial direction with respect to the coil spring 1 due to friction and vibration between the coil spring 1 and the resonance prevention cover 2. There were some drawbacks that prevented it from fully fulfilling its function. Furthermore, in the device for preventing movement of a coil spring resonance prevention cover according to the applicant's earlier application shown in FIG. 2, a tail portion 11 is provided to eliminate the above-mentioned drawback.
Since this requires more material than the cylindrical resonance prevention cover shown in the figure, the cost is relatively high.

The present invention will be explained below. FIG. 3 shows a front view of an embodiment of the shoe return spring used in a vehicle braking device (not shown) according to the present invention, and FIG. 4 shows a side view of the anti-resonance cover 2.
FIG. 5 is a side view similar to FIG. 4 showing another embodiment, and FIG. 6 is a developed view of the resonance prevention cover 2. FIG. 3 shows an embodiment in which the resonance prevention cover 2 according to the present invention is closely fitted to the outside of the coil spring 1, and the present invention is a sixth embodiment of the present invention.
In the figure, a notch 3 is provided close to the end face 6 of the coil spring resonance prevention cover 2, and the end face 6 side is bent into a wave shape 4 in the diametrical direction with respect to the coil spring 1 by pressing or the like as shown in FIG. has been done. In other words, the notch 3 is formed by forming a thin rectangular flat plate into a cylindrical body, and at a position facing the gap 12 of the outer cylinder 8 formed by opposing the edges of the flat plate, the notch 3 is formed by forming a thin rectangular flat plate with a length of the outer circumference of the outer cylinder 8. Formed with a circumferential length of 1/2 or more. Further, the width of the notch 3 may be a dimension that matches the blade width of the notch tool, but it should not be formed to be larger than the wire diameter of the coil spring 1. Also waveform 4
The peripheral wall of the outer cylinder 8 at the portion sandwiched between the notch 3 and one end surface 6 of the outer cylinder 8 is formed into a curved surface having a convex surface in the direction of the gap 12 of the outer cylinder 8, and the convex top part in contact with the gap 12 is formed. On the contrary, the space 7 is formed by bending the curved surface 13 having a concave surface on the side of the gap 12 . The space 7 is formed so that the hook portion 5 of the coil spring 1 makes surface contact with the inner surface of the curved surface 13. The base portion of the hook portion 5 is formed so as to be housed within the enclosure formed by the space 7 and the opposing edges of the outer cylinder 8 forming the gap 12. Further, the edge of the waveform 4 is formed so as to come into contact with the coil end of the coil spring 1. FIG. 5 shows another embodiment of the present invention, which is a modification in which the waveform 4 shown in FIG. 4 is bent. In the waveform 4 shown in FIG. 4, the hook portion 5 of the coil spring 1 is located in the space 7 formed between the outer cylinder 8 of the coil spring resonance prevention cover 2 and the waveform 4, so that the coil spring 1 does not rotate. It can be prevented.
In waveform 4 shown in FIG. 5, since the hook portion 5 of the coil spring 1 is located at position 9, rotation of the coil spring 1 cannot be prevented, so a dowel 10 is provided in the outer cylinder portion of the coil spring 1. FIG. 7 shows the details of the dowel 10.
Set 0. By configuring the coil spring resonance prevention cover 2 as described above, the axial movement of the coil spring 1 can be prevented by the corrugations 4, and the rotation can be prevented by the corrugations 4 or the dowels 10. The present invention can effectively prevent the movement of the resonance prevention cover 2 of the coil spring 1 using extremely simple means.
The anti-resonance cover is useless against the elastic force of the coil spring, as the outer cylinder and corrugations do not come into contact with the coil spring with mutual pressure, except for the outer cylinder coming into contact with the outer peripheral surface of the coil spring with its own elastic force. It becomes possible to provide a practical device for preventing movement of a coil spring resonance prevention cover that does not exert any force.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional coil spring resonance prevention cover, Figure 2 is a front view of a coil spring resonance prevention cover according to a prior application, and Figure 3 is a front view of a coil spring resonance prevention cover movement prevention device according to the present invention. 4 is a front view of FIG. 3, FIG. 5 is a front view of another embodiment of FIG. 3, FIG. 6 is a developed view of the coil spring resonance prevention cover 2, and FIG. 7 is a front view of the dowel 10. It is a detailed view. 1... Coil spring, 2... Coil spring resonance prevention cover, 3... Notch, 4... Waveform,
5... Hook part, 6... End face of coil spring resonance prevention cover, 7... Space part, 9... Space part,
10... Dowel, 11... Tail, 12... Gap,
13...Curved surface.

Claims (1)

[Scope of utility model registration request] An outer cylinder 8 is provided with a gap 12 extending parallel to the axis of the thin-walled cylindrical body and passing through both ends thereof, and is fitted onto the outside of the coil spring 1 to tightly contact the coil spring with elastic force. An outer cylinder 8 is disposed on the peripheral wall facing the gap 12 of 8, close to one end surface 6.
Notch 3 formed with a circumferential length that is more than half of the circumferential length of
The peripheral wall of the portion sandwiched between the notch 3 and one end surface 6 of the outer cylinder 8 is formed into a curved surface having a convex surface that contacts the gap 12 of the outer cylinder 8, and the coil spring 1 is attached to the convex surface that contacts the gap 12. It consists of a gap 12 that engages with the hook 5 and a waveform 4 with a space 7 formed by an arcuate curved surface 13 having a convex surface in the opposite direction. A coil spring resonance prevention cover movement prevention device comprising a resonance prevention cover 2 which abuts the coil end of a coil spring 1 at the end face of a notch 3 and engages a hook 5 of the coil spring 1 in a space 7 of a waveform 4.