Patent GB-191216229-A (GB)
Title: Improvements in Electrical Switches.
Inventor: KLING ALPHA HERBERT
IPC: H02P1/02
Filed: 1912-07-11
Granted: 1913-03-27
Abstract: 16,229. Kling, A. H., and Horton, B. D. July 11, 1911, [Convention date]. Switches, quick-action; mechanically interconnected switches.-Relates to switches, such as are used for starting three-phase motors, in which the closing movement of the handle operates a switch blade which inserts stationary running fuses in each circuit and also temporarily short-circuits them by a second switch blade or by a comparatively heavy movable starting - fuse, the short - circuiting member being withdrawn by a spring when the operating-handle is released. According to the invention, both the running fuse and the shortcircuiting fuse or conductor are movable, and the running fuse, which has a quick make-andbreak action, can be moved to close the circuit only when it is connected in parallel with the starting-fuse, both fuses moving together as one into the closed-circuit position. The running fuses 28 are mounted upon a rectangular frame 29 carried by rods 32, which pass through bosses in the hinged lid of the box and are connected together at the top by a yoke 33. The fuses are connected to blades 19, 20, extending both upwards and downwards. The lower parts of the blades are adapted to contact with the fixed clips 15 which are connected to the main circuit. The upper parts of the blades are adapted to engage contact clips 23, 24 interconnected by the starting or short-circuiting conductors 43, which are each carried by a guide-rod 45, the rods being connected together at the top by the yoke 47. Springs 48 tend to maintain the starting conductors in the fully-raised position. Insulated rods 49 depend from the conductors 43 and pass through guiding-openings in part of the rectangular frame 29. The running fuses are maintained in the ' on ' position, Fig. 2, or the ' off ' position, Fig. 1, by the quick make-andbreak spring mechanism shown in Fig. 2. In the ` off ' position, the running fuses are short - circuited by the members 43, as shown in Fig. 1, by the engagement of the blades 19, 20 with the clips 23, 24. The handle, which is pivoted to the lid, depresses the yoke 47, which in turn depresses the adjacent yoke 33 so that the fuses move, as one, to the contact position. When the handle is released, the short-circuiting fuses are withdrawn from the engagement with the contact blades 19, 20 by the springs 48. A further positive movement of the handle away from the lid opens the running switch by the engagement of a projection 58 on the handle with a nose 59 upon the yoke 33. Another projection 57 on the handle serves to engage a projection 56 on the yoke 47 and positively remove the shortcircuiting conductor, if necessary. To prevent the running fuse from being moved into the contact position independently of the shortcircuiting member, the two yokes are connected together by the spring 54 when the switch is in the ' off ' position, the spring being released by engagement with the cam surface 55 when the switch has been closed. Switch mechanism interlocking with lids.- The rods 32 carrying the running fuses have extensions 36 which, when the switch is closed, enter hollow cylinders 37 upon the base and prevent the lid from being opened.