JPH022991Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Purpose of invention] (Industrial application field) This invention relates to a coupling device for coil springs.

(Prior art) When connecting coil springs, a common method is to use a connecting fitting, as shown in Fig. 4, which has a flange-like spring seat with a predetermined width in the center and symmetrical spring grooves on both sides. It is being done.

However, with this method, first of all, regarding the connecting fitting itself, the part that touches the end of the spring groove on the spring seat side (the part in the direction of the arrow in the drawing) does not allow the cutting tool to escape, so when cutting and finishing it to match the spring, manual machining is required. Since this part has to be finished in a rough manner, the accuracy is poor. This is especially true in the case of large hot-formed coil springs whose shape and dimensions make the processing accuracy of the ends unstable, and it is quite difficult to process them by hand. As a result, the winding support of the spring becomes unstable, reducing durability. It also has the disadvantage of high costs because it cannot be mass-produced.

Furthermore, due to the mass of the central spring seat, an extra weight load is applied to the spring, which may cause problems such as imbalance during vibration.

Furthermore, in order to maintain the strength of the spring, it is desirable to use around three standard windings on one side, but there is not enough space due to the flange-shaped spring seat in the center, especially when a compact design of the spring device is required. ,
I was forced to design three volumes or less. As a result, the spring becomes loosely fitted and is subject to so-called chatter vibrations and impact with the tip of the holder, resulting in a disadvantage that the durability of the spring is significantly degraded.

(Problems to be Solved by the Invention) The present invention has been made in view of the conventional circumstances, and it has a structure in which the connecting metal fitting as a medium is not provided with a flange-like spring seat, and the coil springs are vertically cut from each other. The present invention aims to provide a connecting device that solves the above-mentioned problems by winding the ends with their end surfaces abutted against each other.

[Structure of the invention] (Example) To explain the following with reference to the embodiment shown in the drawings, first, as shown in FIG. 2, and a spring-wound part 3 with symmetrical spring grooves 4, 4 arranged in series on both sides thereof.

On the other hand, as shown in FIG. 2, the coil spring 5 is vertically cut at its connecting end so that the lower side is three-quarters of the wire diameter and the upper side is one-fourth of the wire diameter.

As shown in FIG. 3, each of the spring grooves 4,
A coil spring 5 is wound around the coil spring 4, and the vertically cut inner ends 5a of the coil springs are butted against each other at the flat circumferential portion 2 to connect the coil springs.

[Operations and Effects] The coil spring coupling device according to the present invention is as described above. First, the coupling fitting 1 serving as a medium does not have a flange-like spring seat in the center part, and this part is aligned with the spring groove bottom contour line b. Since the flat circumferential portion 2 is formed to follow the shape of the spring, the overall mass is reduced, and machining to suit the spring is easy, resulting in high productivity and high precision, and the number of spring grooves (fixed turns) can be reduced You can take as much as possible. As a result, the winding of the spring becomes reliable, stable, and strong.
The durability of the spring can be increased. Furthermore, the weight load of the connection part (flange-shaped spring seat only) is reduced.
Since it can be reduced, it is possible to maintain balance during vibration. A compact design is possible, reducing design constraints.

Further, since the spring grooves 4, 4 of the connecting fitting 1 are provided in a symmetrical direction, the springs 5, 5 are connected with their oppositely wound vertically cut end surfaces 5a abutting against each other. The impact on the spring is not concentrated on a local part of the spring, but is absorbed by the entire contact surface, and also acts as a deterrent to the rotation of the spring.

[Brief explanation of the drawing]

Fig. 1 is a side view of the connecting fitting according to the proposed device, Fig. 2 is a side view of the connecting end of the coil spring, and Fig. 3 is a side view of the connecting fitting according to the proposed device.
The figure is a side view of the same connected state as above, and FIG. 4 is a side view of a conventional connecting fitting. 1... Connecting metal fitting, b... Spring groove bottom contour line, 2...
...Flat circumferential part, 3... Spring winding part, 4... Spring groove in symmetrical direction, 5... Coil spring, 5a... Vertical cut end surface.

Claims (1)

[Scope of utility model registration request] The connecting fitting 1 has a flat circumferential part 2 of a predetermined width formed in the center part following the spring groove bottom contour line b, and a spring winding part 3 with spring grooves 4, 4 arranged in a symmetrical direction on both sides of the flat circumferential part 2.
A coil spring coupling device characterized in that the vertically cut end surfaces 5a of the coil springs 5 wound around the respective spring grooves 4, 4 are abutted against each other at the flat circumferential portion 2.