| 摘要 |
933,303. Controllers. YALE & TOWNE MANUFACTURING CO. March 8, 1962 [April 11, 1961], No. 8906/62. Class 38 (3). An electrically operated industrial truck has an electrical traction motor 20 and includes a fluid pressure operable braking unit 24 and a fluid pressure operable speed control unit 25 which are connected by flexible conduits 27, 28, respectively, to a master cylinder 26 whereby operation of the master cylinder supplies fluid pressure to both said units to first release the brake and then operate the controller. When the master cylinder is released, the controller is returned to neutral position and the brake then applied. The piston of the braking unit 24 is urged by a spring in a direction to apply the brake shoes 39, 40 to a brake drum 22. The piston of the speed control unit 25 operates a control rod 53 to actuate in sequence a plurality of switches 52 to vary the motor speed, the piston being spring-urged in the neutral direction of the controller. Depression of a spring- biased pedal 29 operates the master cylinder 26 via rod 30, bell-crank lever 31 and cylinder rod 32. When fluid pressure reaches controller unit 25 to release the control rod 53, springs 54 move the rod toward high speed position under the control of a dashpot 57. |
