Patent GB-190604690-A (GB)
Title: Block System Apparatus for Railways.
Inventor: MONARD ALFRED
Filed: 1906-02-26
Granted: 1907-01-17
Abstract: 4690. Monard, A. Feb. 27, 1905, [date applied for under Patents Act, 1901]. Lift valves; sliding valves; oscillating disk valves; plug cocks; actuating valves and cocks; locking valves; casings.- In a block railway signalling-system, in which the automatic combiner apparatus described in Specifications No. 14,759, A.D. 1903, [Abridgment Class Railway signals &c.], and No. 1655, A.D. 1906, is used, valve apparatus of the kind described below is employed. The apparatus at the entrance of the section consists of an Aubine treadle as described in Specification No. 23,222, A.D. 1905, set in operative position by the signal-operating cylinder 17, Fig. 2. The wire from the cylinder 17 is attached to the crank 8 on the sleeve 7 which operates the disk 22 of the circular valve, Fig. 10. The latch piece 10 pivoted to the sleeve 7 serves to moye the crank 6, and is disengaged therefrom by a train lifting the inner end of the treadle, thus allowing the valve disk 23 fixed on the spindle 5 to be returned independently of the disk 22. The slide valve, Fig. 10, is shown as a straight sliding one with the disks 22, 23 in the operated position with signal 'clear.' A train passing over the entrance pedal 19 allows the counterweight 15 to replace the disk 6 and slide 23, which then connects the reservoir 4 to the block conduit 28- and shuts the ports 25, 27. The exit apparatus B<1> has a pedal 35<1> similar to the pedal 19, the ports of the slide valve being differently arranged, and a long pedal 31<1> of such a length that it cannot be lifted while a train is on it. This pedal 31 is operated by a double-acting cylinder, Fig. 23, which has a valve 47 lifted by a bell-crank 50 when the piston-rod is at the end of the inward stroke, and which exhausts the block conduit 28, through' the conduit 48 and port 49. The lift valve 65, Fig. 27, normally closes the conduit from the exhaust valve' of the cylinder 33. The valve is lifted by the plunger 66 operated by the star-wheel 67 on a spindle rotated by a ratchet lever connected to the arm of the block signal, and reciprocated by the movements of the signal wires. When the valve 65 has been raised and pressure is in the conduit 28, the piston 69 pushes the rod 70 beneath the plunger 66, which keeps the valve 65 open while the block conduit is charged. For permitting and controlling reverse movements out of the section, a return-motion lever, Fig. 30, is added to each row or column corresponding to tracks on which return motion takes place. Other rows or columns have interlocking cams, resembling those described in Specification No. 1655, A.D. 1906, operated from these return-motion levers. A multiple-way cock is mounted on the spindle of these levers. A train having entered the section and stopped, the return-motion lever is turned ninety degrees and pushed in; the lever of the transit line is then returned and the cock turned through forty-five degrees, thus rocking the pieces 81, 83 and locking their cams. The second lever for the transit is then operated, thus displacing the cam 73 and removing the interlocking. The return - motion lever is brought to his original position in the same direction as the lever of the second transit line. A safety pedal may be added, operated by a cylinder charged from the main conduit through a totalizer of two elements which receive pressure from the entrance and exit valves when in a position of rest. The pedal then places a detonator on the rail. Should a train pass the pedal in this position the detonator explodes and the cylinder is exhausted through a mechanicallyactuated valve into a valve chamber which disconnects the block conduit from the slide valves at the ends of the section and sends pressure to the operating table, where a whistle is sounded and a pneumatic visible indicator set.