Hydraulic jack with a system for checking the position of the pi

Details Hydraulic jack with a system for checking the position of the pi Hydraulic jack with a system for checking the position of the pi

1989-10-11

1991-07-16

Look, Edward K.

Motors: expansible chamber type

With signal, indicator or inspection means

200 82E, 92 5R, 92162R, 32420715, F01B 2526, F01B 3112

Patent

active

050315048

ABSTRACT:
In order to check the operation of high-voltage electric circuit-breakers, proximity detectors are housed in through-bores pierced in the wall of the hydraulic jack cylinder, the through-bores being disposed in spaced relation over a distance corresponding to the range of travel of the jack piston. Since no provision is made for any piston ring or packing seal, the jack piston is not damaged as it passes against the outlets of the through-bores on the internal surface of the cylinder. The output signals of the proximity detectors are applied to a unit for measuring and controlling the position of the piston within the cylinder.

REFERENCES:
patent: 4026523 (1977-05-01), Gratzmuller
patent: 4316145 (1982-02-01), Tann
patent: 4385297 (1983-05-01), Schmitt et al.
patent: 4592249 (1986-06-01), Lehmann et al.
patent: 4681992 (1987-07-01), Kazmierski
patent: 4736674 (1988-04-01), Stoll
patent: 4755636 (1988-07-01), Akio
patent: 4756229 (1988-07-01), Drakeley

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