GB191029270A - Improvements in Iron-clad Oil-break Electric Switches. - Google Patents

Abstract

29,270. Spagnoletti, Ltd., and Joyce, V. E. Dec. 16. Oil switches; switch-mechanism, interlocking with lids.-In an ironclad oil-break switch of the interlocking handle and cover type, the oil tank is connected to the cover so that they cannot be completely detached from each other when the tank is lowered for inspection or repair, and the stationary contacts are surrounded with insulation to protect them against accidental contact from tools or the like. According to the modification shown in Figs. 1 and 3, the switch parts, comprising the handle m, the spindle c, knife-blade contacts d, stationary contact e, notched disk o and spring lever p for giving a quick action, are mounted on the cover a, and the oil-tank is attached by hinged bolts u, so that it can be lowered at will along guiderods w, the enlarged ends of which prevent the tank from being completely detached. The interlocking means is composed of an arm y rigidly attached to the switch spindle and turned in at the end z so as to lie under a curved beading 1 if the switch is closed, and between two vertical beadings 2 if the switch is open, the beadings being formed either on the inside or the outside of the oil-tank, and the other parts disposed accordingly. A cylindrical casing f of porcelain or like material protects the fixed contacts e. The pair of knife-blade contacts d are connected at the back through a fuse cartridge k. In a modification, the moving parts of the switch are mounted on the oiltank, and the interlocking-beadings are formed on the cover. In another modification in which the moving parts of the switch are mounted on the cover, the lock to prevent the tank from being lowered while the switch is closed is composed of a raised segmental flange on a disk attached to the spindle and a lug formed on the tank. The lock to prevent the switch from being closed while the tank is down is composed of a detent lever 9, Fig. 6, tending to be drawn by a spring 11 into a notch 13 of a collar 14 and a pin 8 attached to the tank and normally holding the detent out. The operating-handle may be removable, and of the two-ended shape shown in Fig. 9. In modifications which have the locking and quick-break mechanism inside the enclosure, the spindle comes out through a packed gland.