Patent ID: 6543331
Filing Date: 2003-04-08
Classification: B66F,F15B

Abstract:
A hydraulic lifting device includingat least three of a plurality of plungers, each of which is rigidly connected to a support base of said hydraulic lifting device, and wherein said each of said plurality of plungers comprises a hydraulic fluid cavity and a rod; a body coupled with said each of said plurality of plungers, and wherein said body comprises a main plunger, including a main hydraulic fluid cavity and a main rod; a main hydraulic fluid channel, coupling said main hydraulic fluid cavity with a main valve; an auxiliary hydraulic fluid channel, wherein each of the hydraulic fluid cavities is coupled each to the other and with a valve; a central hydraulic fluid channel, coupling said main valve and said valve, and a hydraulic fluid drain connected to said auxiliary hydraulic fluid channel.