Patent ID: 6118234
Filing Date: 2000-09-12
Classification: H01H

Abstract:
In combination a switch assembly for dynamic braking of a direct current motor having a stator coil and a rotor with magnetic poles comprising:(a) a base having a first pair of electrical contacts disposed thereon in spaced arrangement, with each of said first pair of contacts connected to an opposite end of said motor stator coil;(b) a second pair of contacts disposed in spaced arrangement on said base and in spaced arrangement on one side with respect to said first pair of contacts with one of said second pair connected to ground and the other of said second pair connected to a B+ supply voltage;(c) a third pair of contacts disposed in spaced arrangement on a side opposite said one side with respect to said first pair of contacts, with one of said third pair of contacts connected to ground and the other of said third pair connected to said second pair B+ contact;(d) an auxiliary contact disposed on said base intermediate said first pair of contacts, said auxiliary contact connected to said ground contacts of said first and third pairs of contacts; and,(e) a first and a second sliding contact commonly moveable between a (i) neutral position wherein said first sliding contact connects one of said first pair of contacts to said auxiliary contact and said second sliding contact connects the other of said first pair of contacts to said auxiliary contact, wherein both ends of said motor coil are grounded, (ii) a first operating position wherein said first sliding contact connects one of said first pair of contacts to said auxiliary contact and said second sliding contact connects the other of said first set of contacts to the B+ contact of said third pair of contacts for effecting motor coil excitation in one direction, (iii) a second operating position, wherein said first sliding contact connects said one of said first pair of contacts to said B+ contact of said second pair of contacts and said second sliding contact connects the other of said first pair of contacts to said auxiliary contact for effecting excitation of said motor coil in a direction opposite said one direction; and,(f) actuator means operable upon user movement to move said first and second sliding contacts between said neutral position and said first and second operating positions.