EP 0284482 B1 19920108 - DIFFERENTIAL HYDRAULIC JACK FOR OPERATING ELECTRIC BREAKERS
Title (en)
DIFFERENTIAL HYDRAULIC JACK FOR OPERATING ELECTRIC BREAKERS
Publication
Application
Priority
FR 8704134 A 19870325
Abstract (en)
[origin: EP0284482A1] Jack in which the annular chamber 14 of the cylinder 4 is always subjected to the high pressure of an accumulator 18. The piston 6 of the jack is free of any sealing lining in regard to the inner surface 38 of the cylinder and this piston mechanically actuates a valve 42 which sealingly closes off a seat 44 surrounding the feed/purge orifice 28 of the cylinder, at the bottom end of travel of the piston 6. The invention allows the cylinder 4 to be made in the form of a casting whose inner cylindrical surface 38 requires no accurate machining such as grinding or honing. <IMAGE>
IPC 1-7
IPC 8 full level
H01H 3/24 (2006.01); F15B 15/17 (2006.01); H01H 33/30 (2006.01); H01H 33/34 (2006.01)
CPC (source: EP KR)
F15B 15/08 (2013.01 - KR); H01H 33/34 (2013.01 - EP)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0284482 A1 19880928; EP 0284482 B1 19920108; AT E71471 T1 19920115; AU 1351588 A 19880929; AU 599217 B2 19900712; BR 8801365 A 19881101; CA 1319728 C 19930629; CN 1008652 B 19900704; CN 88101589 A 19881012; DE 3867514 D1 19920220; ES 2028314 T3 19920701; FI 881400 A0 19880324; FI 881400 A 19880926; FR 2613122 A1 19880930; FR 2613122 B1 19890623; HU 204328 B 19911230; HU T48331 A 19890529; IN 170378 B 19920321; JP 2593909 B2 19970326; JP S63254623 A 19881021; KR 880011481 A 19881028; KR 920006522 B1 19920807; SU 1644724 A3 19910423; YU 47464 B 19951003; YU 55288 A 19900430; ZA 881688 B 19880906
DOCDB simple family (application)
EP 88400574 A 19880311; AT 88400574 T 19880311; AU 1351588 A 19880323; BR 8801365 A 19880324; CA 562240 A 19880323; CN 88101589 A 19880325; DE 3867514 T 19880311; ES 88400574 T 19880311; FI 881400 A 19880324; FR 8704134 A 19870325; HU 131688 A 19880317; IN 156MA1988 A 19880310; JP 7306688 A 19880325; KR 880003173 A 19880324; SU 4355424 A 19880324; YU 55288 A 19880318; ZA 881688 A 19880309