Patent GB-190512944-A (GB)
Title: Means for Controlling the Movements of Vehicles on Railways and the like.
Inventor: KINSMAN FRANK EUGENE
Filed: 1905-06-22
Granted: 1905-09-14
Abstract: 12,944. Kinsman, F. E. June 22. Electric locomotives and motor vehicles.-An automatic trainstopping device for ordinary or electric railways is described in conjunction with an automatic electric signalling system. The mechanical track trip for interacting with a pendent lever on the train for applying the brakes or cutting off electric power is actuated by an electromagnet in the signalling-circuits. The track treadle or trip is controlled by the condition of the track circuits in the automatic system shown in Fig. 2, in which the insulated rails rare insulatedly divided into blocks each provided with a battery b and two electromagnets 2, 5 for operating the trip and the usual semaphore signal respectively. A vehicle entering a block short-circuits the battery b, and de-energizes the magnets 2, 5. In this case, the trip, comprising two levers t, Fig. 1, pivotally fixed at their outer ends and pivotally connected together at their inner ends, is raised by a spring 15 raising the released core 13 of the magnet 2. A spring similarly raises the released core of the magnet 5 in the case 10<1> to place the semaphore signal S at danger through a connecting-rod 17. The raised trip actuates an arm 56 depending from the locomotive and provided with an antifriction roller. The upper pivot of the arm 56 forms a four-way valve 55 normally closing communication between a pipe 59, leading to the compressed air-brake pipe, and a pipe leading to the cylinder 73 of apparatus connected with the throttle valve 42 of the steam boiler B, as described in Specification No. 24,893, A.D. 1901, [Abridgment Class Railway signals &c.]. The actuated arm 56 opens communication between the pipes 59, 60, and allows the air pressure to actuate the slip-jointed piston-rod of cylinder 73 to shut the throttle valve 42, and the air pressure is then released into the atmosphere to apply the brakes when a port 61 in the cylinder 73 is opened as described in the above-mentioned Specification. The valve 55 and the arm 56 are returned to their normal position after actuation by springs 71, when a spring-pressed shoe 67 is raised by the manual throttle lever 47 from frictional contact with a segmental portion 68 fixed to the valve 55. In a modified form for electrically propelled trains, the valve 55 opens communication between the pipes 59, 60, which leads directly to the atmosphere to apply the brakes. A switch 43<1>, Fig. 4, is also attached to the valve 55 and is included in the power circuit of the vehicle motor so as to break this circuit upon actuation of the trip arm. The power circuit leads from a third rail 90, through a collecting-shoe 91, a wire 89, the manual controller 88, a wire 86, the switch 43<1>, a wire 92, a pole-changing switch 85, a wire 94, the motor field-magnets 80, the polechanger 85, a wire 84, the motor armature 81, a wire 83, a vehicle-wheel axle 82, the rail r, and a wire 96, to a return metallic lead 97. The trip arm and switch 43<1> are returned to their normal position after actuation by springs as before when the spring-pressed core of an electro-magnet 66<1> is withdrawn from frictional contact with a sector 68 attached to the switch 43<1>, the electro-magoet 66<1> being included with a battery in a local circuit which is completed, when the manual controller handle 47<1> is in the ' off ' position, by an attached plate 100 closing a break in the local circuit. To obtain an electric braking action, an additional switch 55<1> may be attached to the switch 43<1> to make contact with either of two contacts 102, 103 according to the direction of travel of the train when the trip arm is actuated. This shortcircuits the motor through a safety resistance 104, causing the motor to act as a generator and so produce a braking effect. In this case, the electric supply for the track signalling system may be obtained from the power supply by connecting the third rail 90 through resistances r<1> to the track rail r, and then through the usual magnets 2, 5 to the opposite track rail r, and by the wires 96 with the return lead 97.