GB188820A - Improvements in or in connection with switch fuses - Google Patents

Abstract

188,820. McDowall, C. W., and Norwest Electrical Manufacturing Co., Ltd. Aug. 27, 1921. Switches, quick-action; bases, boxes, and cases. -Relates to switch fuses in which the fuse carrier and the movable member constitute a pivotallymounted unitary body. The switch is contained in a metal casing 1 and has fixed clip contacts 3, 4 which are bridged by a movable contact comprising a fuse carrier 9 with end blade contacts 18, 19. The carrier 9 is provided centrally with semicircular clips 20 secured together by screws 21, two metal rods 24 passing through holes in the clips 20 and engaging therein recesses in the member 9 to securely grip this member. Alternatively as in Fig. 8 the rods 24 may pass through holes in lugs 23 integral with the member 9. The rods 24 are secured at their ends to brackets 25 by nuts 26 to form a rotatable framework. At one end a bracket 25 pivots on a pin 27 projecting from the side of the casing 1 and at the other end a bracket 25 is secured to a spindle 27 passing through the side of the casing 1 and operated through a lost-motion clutch by an external operating handle. To this bracket 25 is attached a lateral arm 29 with a roller 30 which moves along a flat spring 31 to produce a quick on and off motion, movement in the latter direction being limited by a stop 33. The fuse wire 17, Fig. 4, passes through a central insulating tube 12 and is clamped under nuts 16 in the metal end pieces 10, the wire being retained in position by guides 14. The contact blades 18, 19 are secured to flattened sides 10<a> of the end pieces 10. Where the framework carries more than one fuse carrier 9 they are separated on the rods 24 by distance pieces in the form of - sleeves 34.