F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
254/118
F15B 15/22 (2006.01) H01H 33/34 (2006.01)
Patent
CA 1287040
ABSTRACT OF THE DISCLOSURE A differential hydraulic jack with a damping system for the control of electric circuit-breakers is provided with a floating ring which produces a damping action at the end of travel and is also provided with a damping extension stud which forms part of the jack piston and penetrates into the damping ring. No pro- vision is made on the jack piston for any packing ring forming a seal with the jack cylinder. The damping ring carries two projecting lips constituting a double valve which forms a leak-tight seal with the bottom face of the jack piston and the internal face of the cylinder end. At the end of travel of the piston, the damping ring forms a double sealing valve for shutting-off the supply/drain orifice of the jack.
563899
Goudreau Gage Dubuc
Gratzmuller Claude Alain
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