Patent GB-464754-A (GB)
Title: Improvements in and relating to mechanical interlocking signal frames
IPC: B61L19/02
Filed: 1935-07-19
Abstract: 464,754. Railway-signalling interlocking frames. VEREINIGTE EISENBAHNSIGNALWERKE GES. July 19, 1935, No. 20610. Convention date, July 26, 1934. [Class 105] In a mechanical interlocking frame having wire transmissions to the signals and points the operating pulleys of the transmission are adapted to be engaged by a power-or-manual drive device which is moved along the frame to the position of the desired pulley ; the engagement and drive can only be effected if the block instrument and other interlocking conditions permit. The drive device 57 has rollers 46, 47 running on rails. The hand crank 10 is only attached when the power fails, the shaft end being normally covered. For power operation a side handle 32 on the device 57 is actuated, thereby rocking a cam 29 to the right or to the left and so depressing a lever 27 which moves a rod 21 downwardly to enter a hole 23 in the interlocking frame to ensure alignment powerdevice with the desired pulley. The full downward movement of the rod 21 permits a wedge 24 thereon to swing a spur wheel 1 into engagement with the toothed rim of the operating pulley 56 selected. The full movement of the handle 32 also closes the switch 45 for the motor 16 which thereupon drives the operating pulley 56 through a slip clutch 18, worm gearing 15, spur gearing 12, 11, shaft 6 and a universal joint 5, bevel gearing 3, and the spur wheel 1. The actuation of the handle 32 also moved an arm 500 on the shaft 31 to operate a linkage 39, 390 whereby a locking lug 41, is withdrawn from an aperture in a side rim 42 of the spur wheel so that the handle 32 is held in its actuated position and the switch is closed until the wheel 1 has completed one revolution whereupon the handle 32 returns under spring action and so opens the switch to stop the motor. If the interlocking conditions are unfavourable the side handle 32 cannot be actuated because a sliding rod 33 actuated thereby is blocked against entrance into a frame aperture by a detector bar 36 linked to the tappet bar 38 ; the detector bar 36 exposes indicators at a window 117. If for some reason the drive cannot be completed the switch 45 can be operated to reverse the motor by an emergency handle 44 which is spring-connected with the shaft 31 of the handle 32. Fig. 6 shows the means by which two successive movements are given to the tappet bar 38 during an operation of the pulley. The raising of the limit position roller 66 out of its recess in the pulley rim rocks the lever 65 which acting through a spring connection pulls down the link 73 which, being held to the righthand side by an eccentric boss 61 on the pulley, engages a pin 72 on an arm 70 which is thus rocked clockwise. At the completion of the pulley movement the limit roller drops into its recess so that the link 73 rises but as the eccentric boss 61 has now set the link 73 to the lefthand side an opposite pin 71 is engaged and the second action on the arm 70 is thus a further rocking in the clockwise direction. The arm 70 is connected with the tappet bar 38. A locking lever 69 for the pulley is positively connected with the link 73 and so prevents the pulley being rotated on breakage of the wire transmission if the interlocking conditions are such that the tappet 38 is locked against movement. The frame is provided with glass covers 118 allowing the interior to be seen. The block instrument handles 114 are connected with the interlocking mechanism. Fig. 11 shows a wire compensator arrangement which may be incorporated. The weighted levers 99 of the compensators individual to each wire transmission have links 97, 98 bearing thereon under the action of an additional weighted lever 94 ; the positions of the various links are selected according to the lengths of the wire transmissions. If on an operational movement of a wire transmission any lever 99 tends to rise then the lever 94 will prevent such movement. The Specification as open to inspection under Sect. 91 comprises also a wire compensator, Fig. 11 (Cancelled), in which a weighted lever has an arm 90 to which is pivoted a frame 89 carrying two pulleys 85, 86 around which the transmission wire passes. On an operational movement the frame is initially tilted due to the operational difference of tension in the wires and such tilting thereupon locks the frame on to a rack bar. This subject-matter does not appear in the Specification as accepted.