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Coil Spring Design

IP.com Disclosure Number: IPCOM000075886D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Malmros, GV: AUTHOR

Abstract

A spring is formed from hollow cylinder 10 by a series of displaced pairs of slots. For instance, slots 11 and 12 are cut nearly 180 degrees in circumferential length on opposite sides of 10 with slots 13 and 14 being similarly formed, but displaced by 90 degrees relative to 11 and 12. This progression of slot pairs continues for the length of 10. The forming of the slots can be by cutting, etching, molding or the like. Heat treatment or shot peening can be applied to enhance the characteristics. Stress concentrations at the bridges between slots should be avoided.

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Coil Spring Design

A spring is formed from hollow cylinder 10 by a series of displaced pairs of slots. For instance, slots 11 and 12 are cut nearly 180 degrees in circumferential length on opposite sides of 10 with slots 13 and 14 being similarly formed, but displaced by 90 degrees relative to 11 and 12. This progression of slot pairs continues for the length of 10. The forming of the slots can be by cutting, etching, molding or the like. Heat treatment or shot peening can be applied to enhance the characteristics. Stress concentrations at the bridges between slots should be avoided.

Spring 10 avoids the nonuniform axial forces associated with compression of coil springs and further avoids the tendency of coil springs to rotate when compressed or released. Since the forces are symmetrical in 10, lateral deflections are eliminated and rotational forces equalized. Thus the ends can be permanently anchored. Note that any number of circumferential slots other than two can be used, although a single slot of nearly 360 degrees length would require that the connecting bridge section be able to withstand bending.

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