Patent GB-262082-A (GB)
Title: Improvements relating to emergency train stop devices
IPC: B61K7/12
Filed: 1926-11-11
Abstract: 262,082. General Railway Signal Co., (Assignees of Taylor, H. B.). Nov. 30, 1925, Skid.-Means for placing upon a rail a car stopping device, such as a skate or skid or a derailing device, comprises a support firmly secured to the rail and a member pivotally attached to the support and operatively attached by yieldable means, such as a spring, to a second member to which the skate &c. is connected by slidable detachable means. As applied to the placing of a skate S, Figs. 1 and 2, upon a rail 3, the support 1 is secured to the rail by hook-bolts 2 and is provided with bearing lugs for a shaft 5 to which is pinned an operating arm 10. A member 7 is freely pivoted on the shaft 5 and is adjustably connected to the arm 10 by screws 9, 12, Fig. 4. A dove-tailed tongue 17, which is tapered in the direction of motion of the car, is mounted on spring- pressed bolts 18 in sockets 7<a> on the member 7 and engages a dove-tailed groove in a side lug on the skate S, so that when the shaft 5 is turned through a right angle, the skate is moved on to the rail from the inoperative position shown in Fig. 2 in which it rests on screws 22. The shaft 5 is connected by a universal joint 67, 68 to a shaft 69 which is acted upon by a double coil spring 115 tending to balance the weight of the skate and move it into operative position and which enters a socket in the part 68 to provide a detachable connection between it and the shaft 5. The shaft 69 is also connected by another universal joint 66 to a shaft 64 mounted in bearings in at casing 30 containing the operating mechanism and connected to an electric motor 29. Cranks 63, Fig. 7, on the shaft 64 are connected by a link 61 to lugs 60 on a suitably guided bar 45 on which is a roller 43 engaged by a spiral cam-rib 42a on a main bevel gear 42 geared to a frictionally-driven pinion 52 on the motor shaft 53. The motor casing has a door 31 providing access to the commutator, and the casing 30 has a door 35 with a closure gasket 38. An almost complete rotation of the gear 42 causes the skate S to be placed on the rail, and a rotation in the reverse direction replaces the mechanism in the inoperative position. Current for the motor is supplied by a battery B, Fig. 10, under control of a lever with contacts 85, 86 movable to the dotted-line positions, and when the contacts are so moved, current passes from the battery by wires 87, 88, 89, contacts 74, 7 7. and wires 90, 91 to the armature 92, thence by wire 93, contacts 73, 78, and wire 94 to the field winding 96, whence it returns by wires 97, 98 to the battery. The contacts 77. 78 are mounted on a rotary carrier 79, Fig. 7, having a lug 82 adapted to be engaged and meved by a, lug 42b on the gear 42 near the end of the revolution of the gear, so that the contacts 77, 78 are moved from bridging the contacts 73, 74 into a position to bridge contacts 75, 76 and this completes a circuit in which the batterv is cut out and the motor acts as a generator to check the rotation of the armature. A further, or alternative, check is provided by a pin 111 on the gear 42 striking an arm 110 on a shaft 106 to which are secured friction discs movable between non-rotary friction discs pressed together by a spring. To provide a longer period for the action of the regenerative braking, the lug 42c, Fig. 13, on the main gear is provided with an arcuate pin 130 movable from one to another position, in both of which it is held by a spring catch 131, after the pin has moved the lug 82 on the contact carrier 79 and the movement of the carrier has been completed as determined by the contact of a lug 79a with a stop 135. In a modification, the pivoted member 7 on the shaft 5 is provided with an electromagnet having a winding in series with the field winding 96, the attraction of the magnet holding the skate on the member 7 during its operative movement.