Patent GB-190210141-A (GB)
Title: Improvements in or relating to Electrically Operated Switch, Locking and Operating Devices particularly applicable for Railway and like purposes
Inventor: PROCHASKA FRIEDRICH
Filed: 1902-05-02
Granted: 1903-06-02
Abstract: 10,141. Prochaska, F. May 2. Controlling and locking signals; indicators and repeaters, point or switch and signal; semaphore signals.-Fig. 1 is a plan of the gearing as used for operating and locking points. The driving-wheel R and the driven sector A, Fig. 6, have three sets of teeth at different levels, viz., one, a', r<1>, for driving, another, A', p<1>, A<2>, p<2>, for starting and putting a', r' in gear, and a third, n', n<2>, R', R<2>, which engage to interlock the parts at the ends of the stroke of the sector between the stops W', W<2>. A raised part connects the teeth R', R', on which the teeth n' or n<2> bear and have a braking action. The sector carries a spring-held pivoted piece D, which embraces a lug on the arm B connected to the points by the rod Z. In case of resistance, this piece D frees itself from the lug by tilting against its holding springs f<1>, f and a fixed stop B<2> ensures that the tilting is maintained so that the parts can re-engage when they return. The tilting of this piece D acts through a sliding cam T on the arms F<1>, F' of the fork F, which, in ordinary circumstances, is moved by a projection A<4> on the sector so as to throw the reversing- switch a to f of the motor. A pin F<4> acts through spring arms on the lever L connected to the switch, but the lever is prevented from moving by the interlocking stops F<3>, L<1> until the fork F has been thrown by the cam T or projection A<4>. The sector, the point-operating arm B, and the fork F have contacts to complete circuits at h<1>, h<2>, g', g', and k respectively, and another circuit is made or broken at i by a lever N engaging cam surfaces A<5>, R<3> on the driving and driven parts. It is stated that racks may be used instead of wheels, that the sector may be replaced by a wheel for certain purposes, that spring buffers may be used to give the start instead of the one set of teeth, and that other mechanical differences may be made. The point-operating rod Z works an arm E moving between stops M<1>, M<2>, Fig. 5, and connected to the points by rods J, K, the ends of which bear against a roller G at the ends of their stroke to lock them. The electric connections, shown in Fig. 11, are arranged so that the starting of the motor and unlocking of the operating-levers is dependent on two separate circuits with separate shunt connections, and the switches are lettered as in the motor appliance, Fig. 1, and in the switch gear, Fig. 8. In this latter apparatus, the slide Q is operated by the bent hand-lever S, and is controlled by two locking pawls s<1>, C', which are moved by the electromagnet C and the electromagnet with oppositely-wound coils s, H. The slide also carries stops Q<2>, Q<3>, which, together with a stop s<2> operated by the double-coil magnet, engage and disengage a number of stops on the lever t, which is operated from the hand-lever S bya a spring connection f<6> acting like a toggle. The slide Q works the electric reversing-switch u<1> to u<5>, and the lever t works the switches marked v<1>-v<10> when it is freed from the stop s<2>. With this arrangement of stops &c., the slide cannot be returned before it completes its stroke, which it does step by step, and diagrams are given in the Specification to show the connections made and broken at each step for five positions. The initial position is shown in Fig. 8, where P represents a contact on the line operated by the vehicle, w the motor armature, and x its field. There are four connecting leads l<1>, l<2>, 1<3>, l<4>, and current is supplied at 100 and at 20 volts while a third circuit terminal is earthed. In the first position, the attraction of the pawl C<1> shows that the points are looked, the coil s shows whether a train is on the pedal P, and the motor armature is earthed. The successive motions of the switch lever release the locks, work the motor, and finally allow the lever t to reverse the connections at v so that the lever gear can be returned, whatever may be the conditions at the motor control contacts g', h<2>, i.