Multi-strand bullet spring

Abstract

A multi-strand bullet-shaped spring, comprising a first, second, third, fourth, fifth, sixth, and seventh spiral segment arranged in sequence; the diameter of the first spiral segment is smaller than that of the second and seventh spiral segments; the diameter of the second spiral segment is smaller than that of the third spiral segment; the diameter of the third spiral segment is smaller than that of the fourth spiral segment; the diameter of the second spiral segment is equal to that of the sixth spiral segment; the diameter of the third spiral segment is equal to that of the fifth spiral segment; and the diameter of the seventh spiral segment is smaller than that of the sixth spiral segment. The multi-strand bullet-shaped spring includes six outer strands and a center strand, with the six outer strands wound around the center strand. Compared to traditional single-strand and three-strand structures, this invention offers better flexibility at approximately the same wire diameter.

Claims

1. A multi-strand bullet-shaped spring, wherein: The multi-strand bullet-shaped spring includes a first coil segment, a second coil segment, a third coil segment, a fourth coil segment, a fifth coil segment, a sixth coil segment, and a seventh coil segment arranged in sequence. The diameter of the first coil segment is smaller than the diameters of the second and seventh coil segments. The diameter of the second coil segment is smaller than the diameter of the third coil segment. The diameter of the third coil segment is smaller than the diameter of the fourth coil segment. The diameter of the second coil segment is equal to the diameter of the sixth coil segment. The diameter of the third coil segment is equal to the diameter of the fifth coil segment. The diameter of the seventh coil segment is smaller than the diameter of the sixth coil segment. The multi-strand bullet-shaped spring includes six outer strands and a center strand, with the six outer strands wound around the center strand. The total diameter of the multi-strand bullet-shaped spring is 3mm to 4mm.

2. The multi-strand bullet-shaped spring as described in claim 1, wherein the diameter of the center strand is 1mm to 1.4mm.

3. The multi-strand bullet-shaped spring as described in claim 1, wherein the diameters of the six outer strands are 1mm to 1.4mm respectively.

4. The multi-strand bullet spring as described in claim 1, further defining a first imaginary line and a second imaginary line, the first imaginary line passing through the center of the multi-strand bullet spring, the outermost edge of the first coil segment having a first imaginary point, the outermost edge of the second coil segment having a second imaginary point, the second imaginary line passing through the first imaginary point and the second imaginary point, and the second imaginary line having an angle with the first imaginary line, the angle being 4 to 7 degrees.

5. The multi-strand bullet spring as described in claim 1, wherein the material of the six outer strands and the center strand may be high carbon steel.

6. The multi-strand bullet-shaped spring as described in claim 1, wherein the diameter of the first helical section is 30mm to 35mm.

7. The multi-strand bullet-shaped spring as described in claim 1, wherein the diameter of the second helical section is 40mm to 50mm.

8. The multi-strand bullet-shaped spring as described in claim 1, wherein the diameter of the third helical section is 55mm to 70mm.

9. The multi-strand bullet-shaped spring as described in claim 1, wherein the diameter of the fourth helical segment is 70mm to 85mm.

10. The multi-strand bullet spring as claimed in claim 1, wherein the multi-strand bullet spring bends toward each other at its top and bottom ends.

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