METHOD OF AUTOMATIC HAND BRAKE OPERATION LOCKING Russian patent published in 2015 - IPC B60T7/12 B60T13/68 B61H11/02 B60T15/22 

FIELD: transport.

SUBSTANCE: this invention relates to locking of operation of automatic hand brake built in rolling stock brake cylinder rear cover. In compliance with this method, servo cylinder is incorporated with the master to sense by its piston the difference of opposed forces of throw-in spring and pressure of compressed air from brake line or spare tank. Depending on prevailing force the nut is fitted by the piston end displacing to appropriate side into the barrel to make a pair of conical friction engagement "nut-barrel" or said nut is pulled from said barrel to make the "nut-screw" pair with unlocking thread. Locking assembly elements are complemented by lock bolt-plug with two recesses for seal collar and its tetrahedral lock nut. In standard operation of said brake the depth of screwing-in of the lock bolt-nut cover separating the screw piston working chamber from atmosphere is made to its first threaded end of said recess and locked by said nut. Simultaneously, said cover is sealed by a standard seal collar of used plug. To lock automatic hand brake said lock bolt-plug is screwed in said cover to its second recess from its threaded end. This allows extra screwing of lock bolt-plug in the screw inner thread end. Besides, it is locked by said nut and said cover is sealed by standard collar rearranged from the first recess of standard collar.

EFFECT: better serviceability, ruled out unauthorized locking and visual control over the latter.

2 dwg