Electricity: circuit makers and breakers – Combined with or actuated by connector coupling – Multiple circuit control – selective
Patent
1979-04-02
1981-07-28
Shepperd, John W.
Electricity: circuit makers and breakers
Combined with or actuated by connector coupling
Multiple circuit control, selective
200145, 200308, 200321, H01H 354, H01H 916, H01H 930
Patent
active
042812283
ABSTRACT:
A portable tool for making and breaking high magnitude load currents is provided which is reliable in operation, can be used in applications lacking mechanical switching or cutout apparatus, and provides a secondary, visual assurance to the user when a load is broken. The device preferably includes a pair of vacuum bottle-enclosed, load-making and -breaking contacts, along with a series-connected pair of visually observable contacts exteriorly of the vacuum bottle. Spring-biased operating mechanism assures that the bottle-enclosed contacts actually make and break the load current during use of the tool, while the secondary contacts are operated in sequenced relationship to the make and break contacts. When the device is used to break a current load, transparent portions of the tubular walls of the device permit the user to visually perceive a large open air gap between the secondary contacts.
REFERENCES:
patent: 2233826 (1941-03-01), Allison
patent: 2438746 (1948-03-01), Garrison
patent: 2863026 (1958-12-01), Jennings
patent: 3038980 (1962-06-01), Lee
patent: 3259875 (1966-07-01), Evers
patent: 3471669 (1969-10-01), Curtis
patent: 3887254 (1975-06-01), Landis et al.
A. B. Chance Co. Temporary Load Break Load Pick-Up Vacuum Switching Tool Instruction Manual.
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