Spiral spring

Abstract

A spiral (coiled) spring used for a vehicle and more particularly for a reclining adjusting mechanism for a vehicle seat. The spiral spring which is a spring plate member constructed from a band-like steel plate having high hardness has ridges formed on opposite ends in the coiling direction of the spring plate member so that the ridges project from the surfaces of the spring plate member and that the surfaces of the projected ridges are curved. The spring plate member has an outer end section, an intermediate section extending from the outer end section, and an inner end section extending from the intermediate section, and the spring plate member has a pitch coiled structure. In the pitch coiled structure, an engagement section bent in the radial direction is formed at the end of the outer end section, an engagement coiled core section is formed on the inner end section, and a gap between the intermediate section and the inner end section is set smaller than a gap between the outer end section and the intermediate section. The spiral spring reliably achieves both winding of the spiral spring (backrest is smoothly tilted to a rear position) and restoration of the spring to the original state (the backrest is smoothly returned to a forward position), which are characteristics of spiral springs. Also, abrasion, catching, and frictional noise at the time of contact can be avoided. Further, metal fatigue of the spiral spring can be reduced.

Description

technical field [0001] The invention relates to a coil spring used in a reclining adjustment mechanism arranged in a vehicle seat frame, and relates to a scroll spring formed by making a high-hardness steel strip (reed) into a scroll. Background technique [0002] In the past, this (reclining mechanism) coil spring was constructed so that it was coiled up (tensioned) when the seat back was reclined, uncoiled (relaxed) and returned to its original position when the seat back was raised forward shape. [0003] However, in conventional coil springs, the opposing reed inner and outer surfaces (reed surfaces) contact each other and / or rub against each other during the winding process, and the winding of the inner and outer surfaces at the rubbed place is restricted and stopped, or Continue crimping at an angle. In such a state, the performance of the spring cannot be fully exerted, such as correct winding or unwinding, and there is discomfort that the seat back cannot be reclin...

AI Technical Summary

Problems solved by technology

[0011] In the schemes and inventions of the above-mentioned documents 1) to 6), there is no sufficient description of the pitch roll structure that is most suitable for the reclining adjustment mechanism, and there is an urgent need for room for improvement and further work.

In particular, in the solutions and inventions of these documents 1) to 6), there is no solution related to the spring and / or the return speed of the reclining adjustment mechanism, so it is not suitable for this reclining adjustment mechanism

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