Patent GB-151050-A (GB)
Title: Improvements in and relating to electrical devices for transmitting definite signalsand for receiving said signals at a distance
IPC: B61D41/00
Filed: 1919-05-20
Abstract: 151,050. Robinson, J. W. May 20, 1919. Order apparatus.-In an impulse transmitter of the kind in which the movement of the operating - handle stresses a spring to operate the transmitter contacts, the movement of which is controlled by a flyer geared to the spring motor, the operating handle releases by cam action the detents of the flyer and contact shafts and closes a switch in the main supply circuit, through control levers the effective lengths of which are constant for all positions of the operating handle. The receiver comprises three electromagnets, energized successively, the armatures of which are provided with wedgeshaped projections adapted to engage the pins of a star-wheel geared to the pointer. The pointer is held positively against movement in either direction when either of the armatures is in its fully attracted position. A stop-pin is mounted upon one of the gear-wheels and is arranged to engage a stop in the extreme positions of the receiver in order that it may be brought into phase with the transmitter. A tell-tale receiver, operated from the distant station, may be associated with the transmitter. Transmitter. The transmitter comprises a spring drum 3, Figs. 1, 2, and 3, mounted loosely upon a shaft 2 and provided with a spur-wheel 4 and a cam 4<a>. The drum 3 is geared to a controlling flyer 12 mounted upon a shaft 13 carrying a stop-plate 14 associated with a spring-controlled stop 15. The drum 3 is also geared to a shaft 17 carrying cam-shaped contacts 18, 19, 20; a contact 21 and a stop-plate 22 associated with a stop 37. The contacts 18, 19, and 20, Figs. 3 and 9, are adapted to engage successively spring-contacts 49, 50, and 51; while the contact 21 engages a spring-contact 52 connected to one pole of the source of energy through a normally open switch 35, 36. The shaft 2, keyed to the operating-handle 1, carries an arm 23 upon which are mounted two interacting levers 24, 25. The lever 24 carries a wheel 24<a> engaging the cam 4a, and the forked end of the controlling-lever 25 engages a groove 27 of a sleeve 28 loosely mounted upon the shaft 2. The sleeve 28 is provided with a second groove 29 which engages tne forked end of a lever 51 mounted upon a bracket 32 on the main frame. The controiling-lever 31 has two extensions 33, 34, the former of which releases the stop 15 from the stop-plate 14; while the latter operates to close the switch 35, 36 and carries the stop 37 associated with the stop-plate 22. The spring 47, Fig. 8, of the drum 3 has its ends secured to levers 39, 40 which normally engage a pin 38 on the drum. The spring 47 is tensioned by the movement of a lever 43 actuated from the shaft 2 and carrying a pin 44 arranged between the levers 39 and 40. Normally the apparatus occupies the position shown in Fig. 1, in which position the switch 35, 36 is open, and the shaft 13 of the tiyer 12 and the shaft 17 of the cam contacts are locked. When the handle 1 is operated the wheel 24a moves off the portion 4<b> of the cam-plate 4a and the spring 47 is tensioned. The levers 24, 25 operate to raise the sleeve 28, thereby depressing the outer end of the lever 31. The extensions 33 and 34 of the lever 31 operate to release the shafts 13 and 17 and to close the switch 35, 36 and the camcontacts 18, 19 and 20 successively engage their contact springs to energize the magnets 53, 54, and 55 of the receiver, Figs. 7, 9, and 10. Receiver. The receiver comprises three electromagnets 53, 54, and 55, Figs. 7 and 9; the pivoted armatures 56, 57, and 58 of which are provided with wedge-shaped projections 59, Fig. 10, adapted to engage the pins 69 of a star-wheel 60. The widths of the projections 59 are such that when the armatures are fully attracted they engage adjacent pins on the wheel 60, thereby limiting in a definite manner the movement of the wheel at each step. The wheel 60 is secured to a ratchetwheel 61, engaged by a spring-controlled holding roller 62, and a gear-wheel 63 which is geared to a pointer 68. A pin is mounted upon one of the gear-wheels of the receiver and is adapted to engage a stop at each end of the movement of the receiver. When a tell-tale receiver is associated with a transmitter the former is mounted upon pillars 72, Figs. 1 and 3, and the shaft 2 of the transmitter extends through the receiver and is provided with a pointer 68<a>, Fig. 7.