Patent GB-190710373-A (GB)
Title: Improvements in and connected with the Locking and Unlocking of Railway Carriage Doors.
Inventor: MOUNSEY FREDERICK BARTHOLOMEW
Filed: 1907-05-04
Granted: 1908-02-20
Abstract: 10,373. Mounsey, F. B., and Hall, E. May 4. Fastenings, railway - carriage door.-In pneumatic apparatus for fastening railway-carriage doors simultaneously, means are provided whereby the bolts are both shot and released by a movement of the piston in the same direction and whereby the bolts are held in the shot position without the necessity of keeping the pressure or vacuum in the cylinder. Fig. 9 shows the cylinder B and the means of connecting the piston-rod i<1> to the bolt. operating device, the parts being shown in position just after the bolts have been shot and before the opening of the pressure valve. Mounted to slide in the casing so as to embrace the pistonrod i<1> is the block k, provided with a cross-head k<4> with which the cross, head i<5> on the piston-rod engages in its backward movement. Underneath the block k and mounted on a shaft m are three levers o, p, n, shown separately in Figs. 14, 15, and 16. The lever o has two pawls o<1> connected by a bridge-piece o<4>, and two arms o<2>, o<3>, each connected by a spring p<4>, p<5>, respectively, to an arm p<3> on the lever p, another arm p<1> on which bears against the underside of the piston-rod i<1>. The lever n has two arms n<1>, n<2>, the former extending into the path of a pin k' on the block k and the other connected by a spring n<3> to a lug n<4> fixed to the casing. In the normal position, the door bolts, described later, are kept in the off' position by springs, and the piston i and block k are in positions to the right of that shown in Fig. 9 ; the pawls o<1> of the lever o embrace the piston-rod like a fork, and, the springs p<4>, p<5> being of equal length, there is no tendency for the levers o, p to move. To lock the doors, air is admitted to the cylinder, or a vacuum created, to force the piston backward against the action of the spring k<3>, and with it, when the cross-heads i<5>, p<4> meet, the block k. As the block k moves, it forces down the pawls o' of the lever o, and thus tensions the spring p<4>, the lever p being blocked by the arm p<1> bearing against the piston - rod, and also moves round the lever n. When the piston reaches the end of its movement, the pawls o' snap behind the shoulder k<2> of the block k and retain the latter in position, and when the valve is opened the piston is allowed to return, leaving the block k behind. As the piston returns, the arm p<1> of the lever p is forced by the tension of the spring p<4> into a slot i<4> in the piston-rod. The door bolts are then shot, the end of the block k being connected by a flexible tie l, Fig. 1 (Sheet 1), to rods g sliding alongside the bottom of the carriage and connected to the bolts. When it is desired to unfasten the doors, the valve is again closed and the piston actuated. As the piston moves, the rod carries the lever p round with it until the arm p' comes into contact with the bridge-piece o<4> on the pawls o' and releases the latter from engagement with the projection k<2>, thus allowing the block to return with the piston-rod under the action of the spring h, Fig. 1 (Sheet 2), controlling the locks. On the return of the block k, the spring n' returns the lever n to its initial position, and this, by reason of its lug n<5> engaging a lug p' on the lever p, forces the levers o, p to the normal position. The doors are fastened by bolts a on the frame passing into hasp pieces c on the doors, the bolts a being connected by bell-cranks f to the rod and maintained by the spring h in the withdrawn position. The connexion between the bell cranks and the bolts is made elastic to enable the doors to be closed after the bolts have been shot, and also to allow a bell-crank to move with the others should its bolt become stuck. The arm f Fig. 4, of the bell-crank engages a sleeve e sliding loosely on the bolt a but controlled by two springs e<1>, e<2> housed between it and two fixed collars e<3>. e<4> on the bolt.