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420,010. Switchgear structures. CATON, H., 38, Mount Street, Rochdale, CATON, G., Leny Cottage, Grange Road, and HARLAND ENGINEERING CO., Ltd., Alloa, Clackmannanshire. May 20, 1933, No. 14602. [Class 38 (v)] A metal-clad oil-break switchgear unit comprises a tank 4, a circuit-breaker head having contacts normally depending into the tank, a superstructure 5 containing transformers and surmounting the circuit-breaker head, and means forming a built-in component of the unit for raising at will the superstructure or part of the superstructure alone or along with the circuit-breaker head. In the arrangement shown in Fig. 1, the tank 4 is mounted in a carriage 1 provided with wheels 2 running on rails 3, the unit being movable horizontally to bring plugs 19, 20 into or out of engagement with sockets 21, 22 on a pedestal 23. The circuit-breaker head 33 is bolted to the tank by a flanged joint 6, and the superstructure 5 is in sections 29, 30 bolted to each other and to the cover 11 and circuit-breaker head by flanged joints 31, 34 and 32 respectively. The superstructure houses a potential transformer 26, fuses 27 and current transformers 28, and may be filled with oil or insulating compound. On the flanged top 7 of the carriage 1 are mounted four nutforming members 8, one at each corner, which are engaged by screw-threaded rods 9 coupled at 10 to short rods 9<1> journalled in the cover 11. The rods 9<1> carry sprocket pinions 14 interconnected for conjoint rotation by an endless chain 13. The two front rods 91 carry worm-wheels 15 meshing with worms 16 on a horizontal spindle 17, which is journalled in the cover 11 and is provided with a hand-wheel 18. By disconnecting the joint 6, the circuit-breaker head and superstructure 5 can be lifted bodily by rotating the hand-wheel, or by breaking one of the other joints, the whole or a part of the superstructure may be raised. In a modification, Fig. 4, the tank 4 is clamped between the base of the carriage 1 and the circuit-breaker head. In this modification one of the rods 9 is extended upwardly through the top of the super. structure 5 and provided with a hand-wheel 18<1>, and the circuit. breaker head and superstructure can be raised and lowered only as a whole. The current transformers 39 are incorporated in the terminal bushings of the circuit-breaker head The superstructure chamber contains oil, the level of which is below the upper ends of sealing tubes 38, 391 surrounding the operating spindle 40 of the circuit-breaker and the rods 9 respectively.
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