Method for making an inversion spring for thermal overload relay

Details Method for making an inversion spring for thermal overload relay Method for making an inversion spring for thermal overload relay

1990-08-17

1991-09-10

Echols, P. W.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

29622, 200407, 267159, B23P 1300

Patent

active

050462270

ABSTRACT:
An inversion spring unit for a thermal overload relay and method for making the same, comprising a support member, a spring plate having a first end, a second end, an elongated central axis, and first and second side portions disposed on opposite sides of the central axis, the side portions being bent towards each other at the first end and attached at the first end to the support member for causing the second end of the spring plate to curve in a first direction away from the central axis, and a lug disposed intermediate the first and second ends for selective engagement with a drive portion to cause the second end of the spring plate to curve in a second direction opposite the first direction.

REFERENCES:
patent: 2324798 (1943-07-01), Nordberg
patent: 2777032 (1957-01-01), Burch
patent: 4118610 (1978-10-01), Purssell et al.
patent: 4250367 (1981-02-01), Rossi
patent: 4653179 (1987-03-01), Neumann-Henneberg et al.
patent: 4796355 (1989-01-01), Burch et al.
patent: 4803774 (1989-02-01), Morris et al.

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