Electricity: circuit makers and breakers – Special application – Liquid or moisture responsive
Patent
1985-10-24
1988-01-05
Recla, Henry J.
Electricity: circuit makers and breakers
Special application
Liquid or moisture responsive
200275, H01H 1336
Patent
active
047177950
ABSTRACT:
A precision snap-action switch has a case containing a pair of fixed contacts and a unitary three-arm snap-action member with a pair of outer parallel spring arms, an inner arm parallel to the spring arms having a central longitudinal axis, and a crosspiece connecting ends of the arms opposite free ends thereof and formed in alignment with the inner arm with a double contact positioned beteen the fixed contacts and alternately engageable therewith. Respective tilting bearings engage the free ends of the outer spring arms to maintain them arched. The free end of the inner arm is fixed to the case and is formed immediately adjacent its attachment point and on the axis with a throughgoing section-reducing hole. An actuator movably mounted on the case engages the inner arm between the hole and the double contact for bending the inner arm substantially only at the hole to snap it over from engagement of the double contact with one of the fixed contacts to engagement with the other fixed contact. A generally point-shaped bulge formed at the axis unitarily on the inner arm of engages this bulge and stiffening rib formed unitarily on the inner arm extends along the longitudinal axis of the inner arm between the bulge and the hole so that the inner arm is substantially nonbendable by the bearing surface at the stiffening rib.
REFERENCES:
patent: 2340615 (1944-02-01), Rath
patent: 2469686 (1949-05-01), Eaton
patent: 2631205 (1953-03-01), Millard
patent: 2697145 (1954-12-01), Winet
patent: 2701475 (1955-02-01), Readeker
patent: 2767270 (1956-10-01), Perkins
patent: 3270156 (1966-08-01), Stewart
patent: 3290464 (1966-12-01), Finnegan et al.
patent: 3809834 (1974-05-01), Hipple
patent: 4278855 (1981-07-01), Rossi
Omrom Tateisi Electronics "Basic Switches" Brochure, 1985.
Honeywell Switch Catalogue "B311", 1978.
Omron Tateisi Electronics" Type 2 General Purpose Basic Switch" pp. 1-36, 1970.
Cusick Ernest G.
Dubno Herbert
Kontakta Alkatreszgyar
Recla Henry J.
Ross Karl F.
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