Patent GB-365039-A (GB)
Title: Braking systems
IPC: B60T7/12
Filed: 1930-10-01
Abstract: 365,039. Vehicle brakes. LOUGHRIDGE, M. H., 28, Oakwood Avenue, Bogota, New Jersey, U.S.A. Oct. 1, 1930, No. 29404. [Class 103 (i).] A braking mechanism for a driven element is controlled by a limited free movement in the drive and is operated from a stored source of energy. In railway vehicles a lost motion is provided in the drive so arranged that as the motor takes this up the load on the truck is raised and when the motor ceases to drive, the continued movement of the truck takes up the lost motion in the reverse direction and the load on the truck is lowered and applies the brake. An electric motor drives a truck through a differential gear comprising a bevel gear 102, Fig. 8, carried on the motor shaft 101, an eccentric planetary member 93 mounted on the shaft of the driven bevel gear 105 and gears 103, 104 fixed on the same shaft rotating in the member 93. Gears 103, 104 engage gears. 102, 105 respectively. When the speed of the armature shaft exceeds the speed of the driven gear the eccentric is moved so that its high part raises the load of the vehicle through a roller and a pin on the eccentric engages a stop in this position. When the speed of the driven gear exceeds that of the armature shaft the eccentric moves in the opposite direction to lower the load and apply the brakes. If the motor is reversed the other half of the eccentric comes into operation and the stops engage on the opposite side in the raised position of the eccentric. The car frame carrying the load is mounted on a bolster 71, Fig. 4, supported by springs 73, 74 surrounding guide pins 67, 68 and on a plate 66 of the truck and by a spring 75 on a plate 76 supported by links 77, 78 of the brake mechanism 81. The roller engaging the eccentric is connected to a plunger 90 and lever 85 engaging the plate 76 by projections 89. When the plunger is raised the tension on the brake mechanism is relieved. The bolster 71 and the plate 76 are slidably supported on the king-pin 64 which rests on the plate 66 at the bottom of the channel section crosshead 33 supported on the triangular side frames of the truck. The bolster has an extended section engaging the sides of the crosshead 33. The side frames have vertical extensions 35, Fig. 3, supporting a channel 37 and insulation bar 38 carrying the trolley contactors 44 and a hoist 40. A car frame for use with the trucks comprises a skeleton steel structure 51, Fig. 11, supporting a detachable container 54 and having coupling arms 52, 53 extending from the ends. The centre of gravity being below the coupling arms 56 which are of channel form and on which coupling plates 58 have a sliding motion opposed by springs 59, Fig. 7. The coupling plates are concave-convex and provided with a clearance aperture 62 for the king-pin 64 to allow the coupling plates to roll on one another for taking curves &c. when assembled as shown in Fig. 4, which shows the adjacent coupling arms of two car frames placed one on top of the other on the king-pin. The channels 56 are provided at the outer end with a roller 63 which engages an incline 34, extending from an axle to the crosshead, when a frame is raised for coupling purposes by the hoist 40. A bumper 23, Fig. 3, at each end of the trucks is slidably supported by a horizontal bar and guided by a pin.