GB190801913A - Train Controlling Mechanism for Automatically Applying the Brakes - Google Patents

Abstract

1913. Thompson, J. T. Feb. 7, 1907, [date applied for under Section 91 of Patents &c. Act, 1907]. Locomotives.-An emergency valve in the brake pipe is operated so as to be opened and again closed independently of the driver. The means particularly described consists of an electromagnet having g a permanently magnetized armature, a switch being arranged to reverse the current in the solenoid automatically in order to close the valve. The apparatus is put in action by a track contact 2, which is moved into operative position in conjunction with the signals or otherwise and serves to close a circuit from the battery 71 through a shoe 7 to an electro-magnet 70, which moves a switch arm 21 on to contacts 35, 38, where it is locked by a latch 57 engaging the stud 47. The magnet 20 is thereby energized from a battery 41 and draws a permanent magnet 30, which forms its core, and through a bell-crank 28 moves a bar 24 to the left, thereby actuating a valve 11. This valve normally connects the driver's valve, which is in communication with its upper port, to the trainpipe. When the plug 15 of the valve is displaced by the bar 24, the upper port is closed, the lower port is connected to an escape nipple 17, and the brakes are applied. The movement of the bar 24 is controlled by a dash-pot 66. When this movement is completed, a stop 55 rocks the latch 57 and releases the switch arm 21, which is then moved by a spring 62 pressing against the end 60 of a slot in the bar 24 so as to make contact on the studs 36, 37, thereby reversing the current in the magnet 20 and causing the reverse movement of the bar 24 and resetting the apparatus to normal. The switch arm is released from a latch 58 at the end of its stroke, but is only moved to its mid position, springs 63, 65 being so adjusted. A recording- apparatus 88 operated by the movement of the bar 24 may be added.