Improvements in Means for Controlling the Trolleys of Electrically Propelled Vehicles

13,274. Little, C. W. G. June 11. Collectors.-From the outer end of the trolley arm, a spring-supported mass is suspended, so that, if the trolley arm makes a sudden upward movement, as when it leaves the trolley wire, relative motion is set up between the mass and its support, thus causing a locking- action. The trolley rope 1 passes through a hole in a cap 2 which closes the upper end of a vertical tube 3 secured to the vehicle. The rope passes under a pulley 4, and is fixed to the side of the tube. The frame 5 in which the pulley is mounted carries a vertical pin 6, on which slides a cross-piece 7 supported by the spring 8. The cross-piece is pivotally connected to two arms 12, carrying cheeks 13 on their outer faces. The stress on the spring 8 is adjusted by the nut 9. To the lower end of the vertical pin is screwed a conical piece 10, held in. position by the nut 11. If the rope is jerked suddenly, the conical piece 10 wedges the arms 12 against the tube and prevents further movement.