Patent GB-190721588-A (GB)
Title: Improvements in or relating to Electric Controllers for Railway Service and the like.
Inventor: ZWEIGBERGK THORSTEN VON
Filed: 1907-09-28
Granted: 1908-09-24
Abstract: 21,588. Zweigbergk, T. von. Sept. 28. Switches; motor control systems.-In a motor-controller, the contact-fingers are carried by two connexion boards arranged on opposite sides of the power and reversing cylinders. Means are provided to give the reversing - barrel a longitudinal movement to cut out one set of motors, and the blow-out coil is arranged to swing out without being disconnected. The board 21, Fig. 4, is secured to the back of the casing, and the board 20 is also fastened to the back by brackets 23, 33. The contact-fingers are shown in Fig. 9 ; each has a removable tip 90 on a shank 91, pivoted to a bracket 92. The finger is provided with a lug 99 which stops its outward movement by engaging the nut 96, which also serves as an abutment for the spring 98 and as a means of readjustment by moving the screw engaging the end 97 of the finger. A copper shunt 93 is connected to the finger and bracket 92. The fingers are attached by screws to a bracket 32 on the connexion boards 20, 21, the ends being slotted to allow of an easy removal. The shaft 35 carries an insulating-sleeve and wooden drum 36 provided with reversing-contacts 37 to engage two sets of fingers 25. The blow-out 40 consists of individual cores 15, windings 16, metallic shields 17, and transverse insulating-shields 18, the whole being held together by a bolt 19. The successive windings are connected through one of the wooden shield bars 13 as shown in Fig. 4. The blow-out is provided with contact-plates 11, 12 to connect to fingers 10 on the brackets 23, 33, and is held in position by pins 9, which are engaged by pivoted spring-pressed fingers 8 on the brackets. By turning back some of the spring-pressed fingers 8, the blow-out 40 becomes hinged on the front pins 9, and may be turned out of position without breaking its circuit. This enables the contactfingers 24 to be easily reached. A grooved ring 45 is mounted on the reversing-drum near its centre, and is surrounded by a bracket 46 secured to the two connexion boards. A spring-pressed finger 47 is pivoted to the bracket, and has a tooth 50 passing through an opening in the bracket into the groove in the ring 45. The contacts on the reversing-drum are then level with the two sets of contact-fingers 25, as shown in Fig. 11, and so may connect the two sets of motors. The drum contacts are farther apart than the width of the contact-fingers, so that, by withdrawing the locking-tooth 50 and raising or depressing the drum until the tooth returns to position below or above the ring 45, either set of the motors may be cut out. The shaft 35 is slidably mounted in the base 48, and also in the operating stem 49 which carries the, handle 53 and indicator wheel 50. A pin 51 on this wheel slides in the head 52 on the reversing-switch, and so provides means for turning the drum while permitting the axial shifting. The power drum 28 carries an indicator wheel 55, Fig. 3, and the two switches are interlocked as shown. The arms 60, 61 carry rollers engaging the notched wheels 50, 55, and are pressed apart by a spring 62, which permits only one to be out of a notch in its wheel. To stop the controller at each position, the device shown in Figs. 6 and 7 is employed. Radial lugs 66 are mounted on the top plate 65 of the controller, and a key 68 to engage them is mounted in the handle 67. A lever 69, pressed upwards by a spring 70, raises the key 68 above the lugs 66. The pressure of the driver's hand depresses the lever 69, thus dropping the key 68 to engage the lugs. The guideway of the key is flared to allow the key some movement in the direction of travel, and a spring holds it normally in the forward position. A hole 80, Fig. 7, is drilled slightly diagonally through the handle and spindle, and a pin 81 is passed through the hole and sweated to the handle. This allows the handle to be removed when desired. The shaft hasan umbrella 83 to prevent water from entering the interior of the controller. The wiring is shown in Fig. 14 for four motors with series-parallel control, the motors being arranged in two sets. When one set is cut out by the axial movement of the reversing-switch, the other set can still be connected in series and parallel.