H - Electricity – 02 – K
Patent
H - Electricity
02
K
H02K 7/06 (2006.01) F16F 15/02 (2006.01) F16H 25/20 (2006.01) G09B 9/12 (2006.01)
Patent
CA 2084618
ABSTRACT OF THE DISCLOSURE A linear actuator has reversible electric motors driving a screw-threaded shaft engaging a roller nut. A tubular housing attached to the nut has at its remote end an internal seating and load securing lugs. An hydraulic shock absorber unit, giving linear deceleration, is normally held in its most relaxed condition between the seating and an end of a spacer tube butting against the nut. When the nut is within the shock absorber stroke distance of the driven end of the shaft, the free end of the shaft compresses the shock absorber unit against the seating. When the nut is within shock absorber stroke distance of the free end of the shaft, a ring engages a stop collar, thereby holding the shock absorber body at a fixed distance from the free end of the shaft, and the spacer tube compresses the shock absorber unit. A centrifugal brake is provided on a drive coupling pulley, and restrains rotation of the shaft above a predetermined rate.
Bennett George Robert
Faithfull Terence Frederick H.
Fetherstonhaugh & Co.
Link-Miles Limited
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