JPS623549Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a coil spring.

A coil spring is often stretched between two members in order to tension and bias the two members. Conventional coil springs usually have a C-shape at each end. It has an engaging portion that is bent and integrally formed. and,
These engaging portions are attached by being locked to locking protrusions such as pins or locking recesses provided on each member.

However, in such a simple engagement part that is simply bent in a C-shape, the engagement part tends to be plastically deformed due to the large tensile force of the coil spring or over time. The parts were opened and the engagement easily came off. Moreover, especially if the engagement of one end becomes disengaged for some reason, the biasing force of the coil spring is lost, making it easy for the engagement of the other end to disengage. For this reason, there is a risk that the entire coil spring may fall off from its mounting position and be destroyed, or that the fallen coil spring may come into contact with a live part inside the device and cause the live part to shoot out. It was hot. Therefore, in order to prevent such falling off, conventionally, after installing the coil spring, the engaging part of the coil spring or the engaged part of the mating member is crushed, or the two are glued together. It was fixed. For this reason, the installation work became very troublesome and the workability was poor.

The present invention was developed in view of these problems, and its purpose is to reliably prevent the coil spring from coming off or falling off, even with a relatively simple mounting structure.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.

As shown in FIGS. 1 to 3, the coil spring 1 of this embodiment has a coil portion 2 forming its main body.
and engaging parts 3 and 4 provided at both ends of the coil part 2, and these coil part 2 and engaging parts 3 and 4 are all integrally formed from one linear body 5. It is configured. As shown in the figure, one of the engaging parts 3 is formed by bending an end of a linear body 5 into a substantially C-shape over an angle of about 270 degrees or more along the axial direction of the coil part 2. The bent portion 6 and the bent portion 6
a substantially linear connecting portion 7 formed by bending the linear body 5 toward the inside of the bent portion 6 in a direction approximately perpendicular to the axial direction of the coil portion 2;
At the distal end of the connecting portion 7, the distal end portion of the linear body 5 is bent in a substantially L-shape toward the inner side of the bent portion 6, that is, the direction opposite to the coil portion 2. It consists of Section 8. The other engaging part 4
is a C-shaped engagement portion similar to the conventional one, in which the end of the linear body 5 is simply bent into a substantially C-shape.

As shown in FIGS. 2 and 3, the engaging portion 3 of the coil spring 1 engages with a plate-shaped engaged member 11 arranged approximately perpendicular to the longitudinal direction of the coil spring 1. be installed together. A protrusion 12 having a width w smaller than the inner diameter d of the bent portion 6 is provided at the distal end of the engaged member 11 . Further, a locking round hole 13 is formed approximately at the center of the rear end of the protrusion 12 .

To engage the engaging portion 3 with the engaged member 11,
First, the engaging portion 3 is deformed in the direction of arrow A in FIG. 1 using a finger or the like to increase the inner diameter of the bent portion 6. In this state, as shown in FIGS. 2 and 3, the protrusion 1 of the engaged member 11 is inserted into the bent portion 6.
2 and then release a finger or the like to restore the engaging part 3 to its original state by the elastic restoring force of the bent part 6. At the same time, the engaged part 8 of the engaging part 3 is inserted into the engaging round hole of the engaged member 11. 13 and lock it.

When the engaging portion 3 is engaged with the engaged member 11 in this way, the tensile force of the coil spring 1 (second
Even if the bent portion 6 receives a force from the protrusion 12 in the direction of arrow B in FIG. It is locked so it cannot be opened. For this reason, even if a considerably large tensile force is applied, the engagement portion 3 will not come out of engagement. Moreover, since the locked portion 8 is locked in the locking round hole 13, the engaging portion 3
is held by the engaged member 11, so for example C
Even if the letter-shaped engaging portion 4 is disengaged, the coil spring 1 will not fall off the engaged member 11. Furthermore, since the engaging portion 3 is positioned relative to the engaged member 11 by the locked portion 8 being locked in the locking round hole 13, the coil spring 1 can be moved in any direction. rotation is restricted.

Although the present invention has been described above with reference to one embodiment, the above-mentioned embodiment can be modified in various ways based on the technical idea of the present invention. For example, in the embodiment described above, one end of the coil spring 1 is made into the C-shaped engaging portion 4 similar to the conventional one, but both ends of the coil spring may be configured similarly to the engaging portion 3. In addition, various shapes can be used for the engaged member with which the engaging part 3 engages, for example, a pin with a locking round hole into which the engaged part 8 is engaged. It's okay if it's hot. Furthermore, the locking hole of the engaged member 11 is
It is also possible to form a long hole 14 as shown in the figure. Furthermore, the locking hole provided in the engaged member does not have to be a through hole.

As explained above, in the present invention, at least one end of the coil spring body is bent into a substantially C-shape, and the connecting portion integrally connected to the bent portion is bent inward of the bent portion. The tip of this connecting part is further bent inward into a substantially L-shape to form a locked part, and this locked part is connected to a protrusion of the engaged member to which the coil spring is attached. It is configured to be inserted and locked into a locking hole provided in the section. Therefore, even if a considerably large tensile force is applied to the coil spring, it is extremely unlikely that the engagement will be disengaged, and the coil spring will almost never fall off from the engaged member. Furthermore, since the structure is simple and processing is easy, the cost is low.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a coil spring according to an embodiment of the present invention, FIG. 2 is a partially sectional side view showing the coil spring attached to an engaged member, and FIG. FIG. 4 is a sectional view similar to FIG. 3 showing a modification of the engaged member. In addition, in the symbols used in the drawings, 1...coil spring, 2...coil part, 3...engaging part, 6
...Bending part, 7... Connecting part, 8... Locked part, 1
1...An engaged member.

Claims (1)

[Claims for Utility Model Registration] At least one end of the coil spring body is bent into a substantially C-shape to form a bent portion, and the protrusion provided on the engaged member to which this coil spring is attached is defined as described above. In a coil spring that is locked by being inserted into a C-shaped bent part, a connecting part integrally connected with the bent part and formed by being bent inward of the bent part; The distal end of the connecting portion is further bent inward into a substantially L-shape, and the engaged member is inserted into a locking hole provided in the protrusion of the engaged member and is engaged. A coil spring characterized by having separate parts.