Method for spring assembly |
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| 申请号 | US52047274 | 申请日 | 1974-11-04 | 公开(公告)号 | US3890687A | 公开(公告)日 | 1975-06-24 |
| 申请人 | GOLDBERG JOSEPH H; | 发明人 | GOLDBERG JOSEPH H; | ||||
| 摘要 | The inventive method and apparatus produces a circular coiled wire spring by joining together and interlacing the successive spring convolutions at the ends of a straight coiled spring. The diameter of the spring wire is slightly greater than the lateral displacement between adjacent convolutions, so that the spring is both tensioned and compressed at the end tips. Thus, there is a very tightly gripped interlock, free of any sharp points or ends. A short rod is inserted within the coiled spring to guide and direct each spring as it winds into and intertwines with the opposite spring end. | ||||||
| 权利要求 | 1. A method of producing planar circular, coiled springs having radial uniformity, said method comprising the steps of: a. coiling wire into elongated helical spring; b. cutting said spring to a precise length which is equal to the circumference of said circular spring plus an overlap length; c. inserting a connecting rod into one end of said circular spring helix, the diameter of said rod fitting into the helix with a snugness such that it does not easily fall out, and the length of said rod being approximately equal to the overlap length; d. preliminarily turning said spring a predetermined rotary distance in a first direction to pre-stress said spring, and e. bringing together and intertwining the tip ends of said elongated spring by turning said spring said predetermined rotary distance in a direction opposite to said first direction, whereby no residual pre-stress remains in said spring. 2. The method of claim 1 wherein the successive convolutions of said spring are separated by a distance which is less than the diameter of said wire whereby said intertwined tip ends are simultaneously in tension and compression. 3. The method of claim 1 wherein the tips of the wire ends of said helical spring have a predetermined spacial relationship with respect to each other and to the 360* of the convolutions of said helix, whereby the relative positions of said ends in said intertwined condition may be observed to determine when no residual pre-stress remains. 4. The method of claim 1 and the added step of fitting said circular spring into a gauge block to verify the diameter, circumference, and planar trueness of said circle, said gauge block having a circular groove with the root of the groove lying in a plane which is parallel to the plane of the surface of said block. 5. The method of claim 4 and the further steps of squeezing said circular spring into substantially an oval and of detecting any loss of planar alignment while said spring is in an oval shape. 6. The method of claim 5 and the further steps of observing the end of said oval for planar alignment. 7. The method of claim 1 wherein each of the successive coils of said spring are separated by a distance which is less than the diameter of said wire whereby the wire spring within the area of said intertwined tip ends are simultaneously in tension and compression, the wire tips of the intertwined ends of said helical spring wire having a predetermined relationship with respect to each other and to the 360* of the convolutions of said helix, whereby the relative positions of said tips may be observed in said intertwined condition to determine when no residual pre-stress remains. 8. The method of claim 7 and the added steps of: a. fitting said circular spring into a gauge block to verify the diameter, circumference, and planar trueness of said circle, said gauge block having a circular groove with the root of the groove lying in a plane which is parallel to the plane of the surface of said block; b. squeezing said circular spring into substantially an oval; and c. detecting any loss of planar alignment while said spring is oval. |
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