H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/300, 306/306
H01H 17/06 (2006.01) H01H 3/02 (2006.01) H01H 3/42 (2006.01)
Patent
CA 1194065
ABSTRACT The cam switch mechanism which is particularly appropriate for use in a pullkey where one must be able to initiate two separate switching operations, i.e. lockout and signal, enables a pull on the wire (36) at either end of the unit to trigger a first response, e.g. lockout, but still permit further pulls on the wire to trigger repeated second responses, e.g. signal. First and second microswitches (one shown at 55a) are actuated via independent cam followers (one shown at 53) whose movement is controlled by linear sliding cams (27A, 27B) connected respectively to the pullwires (36) at opposite ends of the unit. Each cam (27A, 27B) comprises two parallel cam plates with the four plates interleaved so that recessed zones (as at 15) in the plates control movement of the cam followers. A manually controllable actuator, such as a lockout knob, may be provided to actuate the first microswitch (55a) independently of the movement of the linear cams without inhibiting subsequent sliding movement of the linear cams. In the case of a latching pullkey the lockout knob has pins (82) projecting into holes (17a, 17b) in the linear cams so that relative movement of the cams (27A, 27B) automatically causes mechanical latching of the lockout knob in a position in which it can only be reset manually. Electrical lockout can occur before mechanical latching. For a non-latching pullkey the pins (82) are omitted.
421964
Communication And Control Engineering Company Limited
Ridout & Maybee Llp
LandOfFree
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