GB103441A - Improvements in Controllers for Electric Motor Circuits. - Google Patents

Abstract

103,441. Igranic Electric Co., (Cutler-Hammer Manufacturing Co.). July 27, 1916. Controllers, actuating-mechanism for; returned to zero without making starting-connexions.- The moving contacts of a motor-controller which has starting and running positions are operated to those positions by a handle moving in one direction through the operation, and are returned to zero from the running position without reestablishment of the starting-connexions. The movable contacts 18, 19 are carried by a drum 1 mounted on a rectangular part of the controller shaft, and the contacts 4<b>, 5<b>, 6<b> are carried by a drum 2 loosely mounted on a cylindrical part of the shaft. The contacts 4b, 5<b>, 6<b> may be made from a continuous V-shaped plate, as shown in Fig. 3. The drum 2 has peripheral recesses 20 in which engage the depending ends of the contacts 19. When the handle is in its off position, the contacts 4b, 5<b>, 6b engage the fixed contacts Z, and they remain stationary when the handle is moved forward to the starting position, owing to the lost-motion connexion between the contacts 19 and the drum 2. The contacts 18 engage the contacts W, X, Y to short-circuit the fuses 31, 32, 33 and to connect the motor windings 28, 29, 30 in star. When the handle is moved forward to the running position, the two drums move forward together, and the contacts 19 engage the contacts X, Y, Z to insert the fuses and to connect the motor windings in mesh. As the handle is returned to its off position, the contacts 18 and the contacts 4<b>, 5<b>, 6b reach the fixed contacts at different times, so that the star connexions are not completed. The hooked armature 14 of an electromagnet 13 engages a pin 15 on an arm 16 to hold the controller in its on position.