Electricity: circuit makers and breakers – Snap – Double snap
Patent
1989-08-07
1990-06-05
Recla, Henry J.
Electricity: circuit makers and breakers
Snap
Double snap
200406, H01H 514
Patent
active
049316052
ABSTRACT:
A multi-pole switch is provided which has a large air gap between contacts in the open state, and which requires medium to high actuating forces while providing tactile feedback to indicate that full actuation has occurred. The switch includes a pair of sheet metal shorting contacts (22, 24, FIG. 2) each extending in a largely rectangular loop, with one long side (26) and the opposite short sides (30, 32) forming a clamped outer region (34), and with the other long side forming a beam (28) that can be deflected down towards a pair of fixed switch contacts (50, 52). The outer region (34) is deflected so the beam (28) is upwardly bowed. The beam includes a main beam portion (36) and fingers (46, 48) extending from it, the fingers being deflected against the switch contacts when the main beam portion is deflected. Bowing can be facilitated by a third switch contact (70) lying under the other long side (26) of the shorting contact. An actuator (12, FIG. 3) includes a plunger (56) with a pair of bosses (60, 62) lying near opposite sides of the main beam portion of each shorting contact. A snapdome (100) lies over the plunger to provide tactile feedback, and an elastomeric button (110) lies over the snapdome.
REFERENCES:
patent: 2036295 (1936-04-01), Piffath
patent: 3783205 (1974-01-01), Boulanger
patent: 4004121 (1977-01-01), Twyford
patent: 4336429 (1982-06-01), Jackson et al.
patent: 4391845 (1983-07-01), Denley
patent: 4484042 (1984-11-01), Matsui
patent: 4587387 (1986-05-01), Piguet
ITT Corporation
Kupferschmid Keith
Peterson Thomas L.
Recla Henry J.
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