Sensitive latch and trip mechanism

Details Sensitive latch and trip mechanism Sensitive latch and trip mechanism

1988-12-15

1990-08-21

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Latching means

335 21, H01H 920

Patent

active

049510223

ABSTRACT:
A sensitive latch and trip mechanism includes a latch plate supported for pivotal movement under the influence of a load, and a latch lever supported for pivotal movement about a lever axis. The lever includes a latching surface disposed in a latching surface plane and a lever axis located a distance A from the latching surface plane in a direction perpendicular to the latching surface plane and offset from the latching surface by a distance B in a direction parallel to with both the latching surface plane and the plane in which the latch plate pivots. A coefficient of friction is defined between the latching surface and a surface of the latch plate interengaged therewith, the coefficient of friction U being correlated with the distances A and B to follow the relationship U.gtoreq. B/A. In this manner, the lever may be easily pivoted from its latching position to unlatch the plate.

REFERENCES:
patent: 2048114 (1936-07-01), Gano et al.
patent: 3046371 (1962-07-01), Jencks
patent: 3222475 (1965-12-01), Woods et al.
patent: 3317867 (1967-05-01), Powell
patent: 3605052 (1971-09-01), Dimond et al.
patent: 4119935 (1978-10-01), Wien et al.
patent: 4246557 (1981-01-01), Michetti et al.
patent: 4459672 (1984-07-01), Fajner et al.
patent: 4475094 (1984-10-01), Grenier et al.
patent: 4622530 (1986-11-01), Ciarcia et al.
Advanced Diemaking, by D. Eugene Ostergaard, 1967, pp. 116-118.

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