Electricity: circuit makers and breakers – Multiple circuit control – Pivoted contact
Patent
1989-09-29
1990-12-04
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Pivoted contact
200 4308, H01H 2176, H01H 2706
Patent
active
049755498
ABSTRACT:
A keylock switch has a standard housing and rotary switch unit for two, three, four, five or six terminals. The switch includes an outer housing has a lock section and an inner contact section closed by a back plate with fixed contacts secured thereto. A keylock assembly includes a rotating tube with edge slots and pivoted locking levers which are pivoted to a release position within the tube. A hub extends from the lock section into a contact chamber and forms a bearing wall, on which a contact carrier plate bears. A rotating U-shaped contact is coupled to the plate bottom and includes an integral leaf spring in the center acting between the carrier and a fixed terminal plate. The U-shaped contact includes opposite end contact plates, with one about twice the width of the other to span two adjacent fixed contacts while the shorter plate engages a single fixed contact. A coil spring encircles the hub, with end ears bearing on spaced ends of a circumferentially extended housing tab to stress the coil carrier spring. A spring tab is located between the ears engages an ear to further stress the coil spring after a selected angle and create a reset force. A stop tab on the carrier and housing limit rotation of the carrier. Fixed contact locations are located on the back plate.
REFERENCES:
patent: 3311718 (1967-03-01), Allison et al.
patent: 4320266 (1982-03-01), Leiter et al.
Handy Allen L.
Krubsack Larry J.
Lawton John G.
Clum Manufacturing Company, Inc.
Scott J. R.
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