Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1991-07-10
1992-04-14
Echols, P.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
B21F 3500
Patent
active
051035430
ABSTRACT:
A torque transmitter includes three coaxial helically wound springs of different inner and outer diameters positioned relative to each other such that the inner and outer generally circumferential surfaces of the center spring form interference fits with, respectively, the outer generally circumferential surface of the inner spring and the inner generally circumferential surface of the outer spring. The inner and outer springs are wrapped in one direction and the center spring is wrapped in the opposite direction.
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patent: 4884579 (1989-12-01), Engelson
Echols P.
The MicroSpring Company Inc.
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