JPS6242190Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used in small equipment, vehicles, etc., and the tip extending radially outward from the end of the coil part is bent toward the coil part side, that is, in the direction of contraction of the coil spring. , relates to a mounting structure for a tension coil spring that hooks a hook portion made up of the bent portion and the coil portion.

An example of the conventional mounting state of this type of tension spring will be explained with reference to FIGS.
is a relatively thick plate-shaped movable latching member.
Reference numeral 3 denotes a tension coil spring, and one end of the coil portion 3a is formed with a linear portion 3b extending continuously outward in the radial direction of the coil, approximately corresponding to the plate thickness of the hanging member 2, and the tip thereof is formed as described above. One hook portion 3c is formed by being bent toward the coil portion 3a side and consisting of the bent portion and the outer periphery of the coil. The other terminal end of the coil portion 3a extends continuously in substantially parallel to the center line of the coil portion 3a, and the other hook portion 3d bent into a hook shape is formed at the tip of the end of the coil portion 3a. It is hung in the annular groove 1a. However, one of the conventional hook portions 3c described above is hooked into a circular hook hole 2a drilled in the hook member 2 into which the hook portion 3c can be inserted, but it is clear from the figure. As shown in FIG.
Since the movement of c in the opening direction is not restricted in any way, the coil part 3a on the one hook part 3c side
One turn of the coil portion 3a is stretched to an extremely greater extent than the other coil portions 3a, and the installation load becomes unstable, and the coil portion 3a is greatly deformed, resulting in fatigue failure and the hook portion 3a.
The withdrawal of c occurred frequently.

The present invention eliminates the above-mentioned drawbacks by restricting the movement of one hook portion 3c in the opening direction. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 2A and 2B show an example of a mounting structure for the tension coil spring 3 that takes into consideration only the hooking member 2 side.

That is, the tension coil spring 3 is attached to the hooking member 2 arranged parallel to the tension direction of the tension coil spring 3.
An insertion hole 2b having a size that allows the hook portion 3c to pass through is opened.

Furthermore, a latching hole 2c is opened in communication with the insertion hole 2b.

The opening width of the locking hole 2c is approximately equal to or slightly larger than the wire diameter of the tension coil spring 3.

The latching hole 2c is opened in a direction intersecting the tension direction of the tension coil spring 3. As a result, substantially the starting end A and the terminal end B of the straight part 3b formed continuously from the terminal end of the coil part 3a are connected to the hooking hole 2, respectively.
By being supported in contact with the two surfaces of the inner edge of the latching hole 2c, that is, by making the inner edge of the locking hole 2c the contact portion of the terminal end B, even if a tensile force is applied to the tension coil spring 3,
This tensile force is prevented from being directly transmitted to the hook portion 3c, thereby restricting the opening of the hook portion 3c, thereby preventing excessive deformation of one turn of the coil portion 3a on the hook 3c side.

FIG. 3 shows an embodiment suitable for the above-described embodiment in which the latching member 2 for latching the tension coil spring 3 is a thin plate. That is, one side of the latching hole 2c that comes into contact with the terminal end B of the straight part 3b continuing from the coil part 3a,
By constricting the straight portion 3b so as to increase the distance from the starting end A, the mounting state of the spring 3 is stabilized.

FIGS. 4A and 4B show an embodiment in which the hooking member 4 for hooking the tension coil spring 3 has a T-shaped cross section and is composed of two plates, a belly plate 4a and a back plate 4a'. One hook 3 of the spring 3 is attached to the outer periphery of the belly plate 4a in advance before it is fixed to the back plate 4a' by welding or the like.
A large notch 4b for inserting the spring 3, and a notch 4c slightly wider than the wire diameter for hooking the spring 3 continuously thereto. Thus, when the spring 3 is installed, the starting end A of the linear portion 3b continuing from the terminal end of the coil portion 3a is supported by the belly plate 4a, and the terminal end B is in contact with the back plate 4a'.

FIG. 5 shows a notch 4c slightly wider than the wire diameter of the belly plate 4a in a part of the back plate 4a' in the above embodiment.
A constricted portion 4d is formed that protrudes in the direction into which the hook portion 4d enters the hook portion. This prevents the positional shift of 3c.

As is clear from the embodiments described above, according to the present invention, the mounting state of the spring 3 can be stabilized with a simple structure, so that the mounting load can be stabilized. Furthermore, since stress concentration and excessive deformation on the one hook portion 3c side can be avoided, durability is greatly improved, and fatigue failure and detachment of this portion can be completely prevented. Furthermore, according to the present invention, since there is no installation length loss, the entire length of the coil portion 3a when installed can be regarded as the actual installation length.
Not only can it be easily installed in a narrow space, but its design is also extremely easy.

It is clear that the present invention can also be applied to a structure in which one hook portion 3c is formed at the other end of the coil portion 3a.

[Brief explanation of the drawing]

Figure 1 A and B show the conventional spring mounting structure,
2A and 2B show an embodiment of the spring mounting structure according to the present invention, A is a front view thereof, B is a sectional view of A, and FIG. Figure 3 shows a modification of Figure 2, Figures 4A and 4B show other embodiments of the present invention, and Figure 4A is a front view thereof;
B is a cross-sectional view of A, and FIG. 5 is a modification of FIG. 4. 2... Latching member, 2b... Search hole, 2c... Latching hole, 3... Tension coil spring, 3a... Coil part, 3b... Straight line part, A... Starting end, B... Terminating end,
3c...One hook part, 4...Latching member, 4b
...Large notch, 4c... Notch slightly wider than the wire diameter, 4d... Restricted portion.

Claims (1)

[Claims for Utility Model Registration] A hook portion is formed by bending the end of a linear portion extending outward in the radial direction of the coil portion from the end of the coil portion into an L-shape in the direction of contraction of the coil spring; In a tension coil spring mounting structure in which a hook part is latched to a latching hole of a latching member located parallel to the tension direction of the coil spring, the latching hole of the latching member is aligned with the tension direction of the tension coil spring. The hook part of the tension coil spring is passed through and locked in narrow elongated holes opened in communication in the intersecting directions, and the elongated holes of the latching member are inserted into the middle of both the inner and outer surfaces of the straight part of the tension coil spring. A mounting structure for a tension coil spring that is brought into contact with the opposing inner surface of the spring.