Multiple terminal switch apparatus

摘要

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.