JPH019707Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a spring roller for a seat slide that is interposed in a vehicle seat slide rail.

Conventionally, solid metal rollers have been used as the sheet sliding rollers, but recently there has been a trend toward using coil springs as rollers due to demands for weight reduction and cost reduction.

For example, Utility Model Application Publication No. 52-128223 exists as a prior art regarding this.

Since a coil spring is a spirally wound wire, it cannot be used as a roller as it is, and winding ends must be treated to reduce sliding resistance and ensure parallel rolling.

The above-mentioned conventional technologies have also been devised to solve these technical problems, but in either structure, sufficient consideration is not given to the parallelism of the winding end surface with respect to the rail sliding surface, so that smooth smoothness, which is the life of the roller, cannot be achieved. It has the disadvantage of poor rolling properties and stability.

In addition, attempts have been made to polish the left and right end surfaces of the coil spring to achieve parallelism, but this method involves making the wire at the winding end extremely thin or sharpening it, and using that surface to create a rail sliding surface. Since it rolls while making strong contact with the metal, there is a risk of problems such as deformation and breakage.

Therefore, the present invention was created with the intention of eliminating the above problems, and as shown in the illustrated embodiment,
The winding portions 4 and 5 adjacent to the left and right winding ends 2 and 3 of the closely wound coil spring 1, that is, the winding portions 4 and 5 that have undergone a winding stroke of approximately 360° from the left and right winding ends 2 and 3, are respectively outwardly. The left and right winding ends 2 and 3 are positioned within the winding diameter of the left and right expanded winding portions 4 and 5, respectively.

The left expanded winding portion 4 and its winding end 2, and the right expanded winding portion 5 and its winding end 3 are approximately as shown in the figure.
The left and right winding end faces from the left and right expanded winding parts 4 and 5 to the left and right winding ends 2 and 3, that is, the left and right end faces 6 and 7 of the coil spring, are arranged with a phase shift of 180°, and are perpendicular to the axis x, respectively. The expansion angle is set to an angle θ such that As described in detail above, the present invention has the left expanded winding section 4 and its winding end 2, and the right expanded winding section 5 and its winding end 3 at the same position and approximately.
Since they are arranged with a 180° phase shift and the expansion angle is set to an angle θ such that the left and right end surfaces of the coil spring are perpendicular to the axis, the left and right end surfaces 6 and 7 of the coil spring can be properly aligned vertically and parallelly. At the same time, the left and right winding ends 2 and 3 can be properly contained within the winding diameter of the left and right expanded winding portions 4 and 5, and exposure of the winding ends 2 and 3 can be reliably prevented.

As a result of the above, the left and right winding ends 2 and 3 are located under the inner surface of the maximum expansion part of the left and right expansion winding parts 4 and 5 without any special bending process, so that the left and right winding ends 2,
Good vertical parallelism of the left and right end surfaces 6 and 7 of the coil spring 1 can be achieved without causing the left and right end surfaces 6 and 7 of the coil spring 1 to protrude outside.

Furthermore, there is no need to polish the left and right end surfaces of the coil spring in order to achieve the above-mentioned vertical parallelism.
The reduction in strength caused by polishing, the aforementioned problems in rolling performance, etc. can be completely eliminated.

As shown in the figure, when the spring rollers as described above are interposed on the seat sliding rail consisting of the seat support rail 9 and the fixed rail 8, the left and right end surfaces 6, 7 of the spring rollers are approximately the left and right inner wall surfaces 8a of the fixed rail 8. A perfect parallel state can be maintained.

The left and right end surfaces 6 and 7 of the spring rollers are usually interposed with some play, and the seat support rail 9 is supported on the upper surface of the rollers. When a load is applied to this rail, that is, when a passenger is seated, While allowing some deflection, the left and right inner wall surfaces 8 of the fixed rail 8
Contact with a.

In this case, as described above, parallel contact is maintained well and parallel sliding is obtained.

Therefore, rolling properties are extremely smooth and stable, and a nimble seat slide can be obtained.

Of course, the spring roller may be placed in parallel contact with the rail inner wall surface 8a from the beginning as long as it is strong enough not to cause deflection.

The spring roller described above can be processed in addition to the known winding process of a coil spring, and does not require bending or grinding of the winding end.

Therefore, the production cost is lower than that of conventional spring rollers, and the purpose of cost reduction can also be achieved.

[Brief explanation of the drawing]

FIG. 1 shows the general shape of a coil spring for understanding the present invention. Fig. 2 is a front view of a spring roller showing an embodiment of the present invention, Fig. 3 is a front view of the spring roller, and Fig. 4 is a front view of the spring roller shown in a transverse section of the rail when it is installed on a sliding rail for a vehicle. . 1... Coil spring, 2, 3... Same left and right winding ends, 4, 5... Left and right winding parts adjacent to the same winding ends,
6, 7... Same left and right winding end surfaces, 8, 9... Vehicle seat sliding rail.

Claims (1)

[Scope of utility model registration request] The winding portions 4 and 5 adjacent to the left and right winding ends 2 and 3 of the tightly wound coil spring 1 are expanded outward, respectively, and the left and right winding ends are placed within the winding diameter of the left and right expanded winding portions 4 and 5. 2 and 3 respectively, and the left expanded winding part 4 and its winding end 2, and the right expanded winding part 5 and its winding end 3.
and are arranged with a phase shift of approximately 180°, and the expansion angle is set to an angle θ such that the left and right end surfaces 6 and 7 of the coil springs are respectively perpendicular to the axis x. spring roller.