B - Operations – Transporting – 66 – D
Patent
B - Operations, Transporting
66
D
188/4, 340/48
B66D 5/02 (2006.01) H01H 9/02 (2006.01)
Patent
CA 1152007
Case 2710 SELF-ADJUSTING BRAKE ENGINE LIMIT SWITCH ASSEMBLY ABSTRACT OF THE DISCLOSURE Previously limit switch assemblies for friction mine hoist brake engines were fixed to a mounting bracket. The assembly usually had two spaced apart facing microswitches with an operating arm or actuator extending between them. When the brakes were released the actuator would move outwardly to operate one switch providing an indication that the brakes had released and were not dragging. When the brakes were applied the actuator would move inwardly to a brake applied position but not far enough to operate the other switch until such time as the brake linings were worn enough to require brake adjustment at which time the other switch would operate. When the brake engine was first set up the position of the actuator at brake release and brake applying conditions was not known and shimming was required to place the switches in the correct position. If the position was not correct the switches could be smashed. The self-adjusting limit switch assembly of this invention has the two switches mounted on a slide for sliding movement on a bracket. A transverse slot in the slide has two facing surfaces. The switches are mounted on each side of the slot with their operating members extending slightly past the slot. The actuator is positioned to extend into the slot. When the brakes are first moved to the brake released position the actuator engages not only the operating member of the switch on that side, but also a wall of the slot and moves the slide to a brake released position thereby correctly adjusting the position of the switches. When the brakes require adjustment due to wear, the actuator engages the operating member of the second switch, as before, causing an indicator to function.
366126
Eastcott Peter D.
Scuccato Serge L.
Truman Peter T.
Canadian General Electric Company Limited
Eckersley Raymond A.
LandOfFree
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