Patent GB-191305851-A (GB)
Title: Improved Means for Automatically Locking and Unlocking Doors of Railway Carriages and other Vehicles.
Inventor: HEPPENSTALL NOEL
IPC: E05B65/42
Filed: 1913-03-10
Granted: 1913-12-04
Abstract: 5851. Heppenstall, N., and Wilkinson, J. L. March 10. Railway-carriage doors and the like, fastening automatically. - In a governor-operated apparatus for automatically locking and unlocking the doors of railway carriages and other vehicles, a loose boss is fitted at each end with a clutch, one clutch adapted to engage a fixed clutch and the other a governor-operated clutch, whereby, when the carriage starts, the boss is partly rotated to operate the door-locking mechanism. On a subsidiary axle 14, Fig. 2, a pulley 15 is keyed and is driven from a small pulley on the carriage axle, while a pulley 22, driven from a large pulley on the carriage axle, is mounted upon a lined sleeve 19, the movement of which in a longitudinal direction is prevented by a collar 21 secured to the shaft. From the sleeve 19, brackets 24 project through slots 29 in a sleeve 28 and provide bearings for cranked governor rods 25, the slotted inner arms 26 of which engage pins 27 on the sleeve 28. A sleeve 30, flanged at one end 31 and having at the other end a clutch member 32, is keyed to the shaft 14 in such a manner as to be capable only of slight longitudinal motion. Fixed to the bracket 12 is a clutch member 33, and loose on the shaft 14 is the boss 34, the clutch teeth 35, 36 of which are adapted to engage those of the clutch members 33, 32 respectively. A spring 39 is interposed between the flange 31 of the sleeve 30 and the collar 37 on the shaft, which limits the longitudinal motion of the boss 34. A lever 41 transmits the motion of the boss 34, through a link 42, to a shaft 43 on which is a pinion 44, Fig. 1, gearing with a pinion 45 on a shaft 1 alongside the carriage. Opposite each door of the carriage is a lever 3 connected to a vertical rod 4 provided with a pin 5 which engages one arm of a bell-crank lever 7, pivoted at 8 and forming the latch. The lever 7 is normally spring-urged into locking engagement with the door. unlocking being effected by the rising of the rod 4. The pivot 8 is square-ended to permit the door to be unlocked by a suitable key. When the carriage starts, a rapid drive is imparted to the pulley 22, causing the governor-balls 25<a> to fly out and the sleeve 28 to be moved to the left to the full extent of the slot 29. The clutch 32 is thus forced into engagement with the clutch 36 of the boss 40, and as the member 32 is rotating slowly through the pulley 15, the boss 34 begins to move, drawing down the lever 41 and thereby rocking the shaft 1 to permit the door latches to drop. These movements are effected within a quarter of a revolution of the boss 34, after which its clutch teeth 35 are pulled into those of the fixed clutch 33 by the springs 40, preventing further rotation. When the carriage stops, the balls collapse and the sleeve 28 is drawn back, permitting the strong spring 39 to overcome the lighter springs 40 and disengage both the clutches on the boss 34. The spring 46 then restores the shaft 43 to its original position and withdraws the latches 7 from locking engagement. In the Provisional Specification is described a modified means for communicating the motion of the boss 34 to the shaft 43.