Oscillatory electro-hydraulic system
AssigneeJ. I. Case Company
InventorJoseph Alcalay
Life of this patent
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Abstract
An oscillatory electro-hydraulic system for a material handling bucket and including two hydraulic cylinder assemblies connectable with the bucket for tipping the bucket, and including a hydraulic pump and control valve and pressure relief valve and a reducing valve, all for directing flow to the respective cylinder assemblies. An electric system is interconnected with the assemblies and with one of the control valves, for controlling the flow of fluid to one of the two cylinder assemblies.
Claims13
An oscillatory electro-hydraulic system for a material handling bucket, comprising two hydraulic cylinder assemblies connected with said bucket to be mechanically connected relative to each other for pivoting said bucket, said cylinder assemblies being the double acting type and each including a cylinder portion and a rod extendable from the cylinder portion of each of said assemblies, a hydraulic pump hydraulically connected in separate respective connections to the head and rod ends of a first one of said cylinder assemblies, a hydraulic line hydraulically connected between said cylinder assemblies, a hydraulic control valve connected with said hydraulic line and having two pairs of hydraulic passageways with each pair thereof having one of said passageways separately selectively hydraulically connectable to one of the head and rod ends of the second one of said cylinder assemblies, for controlling hydraulic flow to the respective head and rod ends of said second one of said cylinder assemblies, and the other of said passageways in each of said pairs being a hydraulic return passageway, all for permitting hydraulic pressurizing and actuation of said first one of said cylinder assemblies while said second one of said cylinder assemblies is free to actuate without hydraulic pressure, an electric system operatively associated with both said control valve and one of said cylinder assemblies for operating said control valve, electric switch means included in said electric system and being arranged to be actuated in response to extension and contraction of said one of said cylinder assemblies to thereby actuate said control valve to direct hydraulic flow to and from the head and rod ends of said second cylinder assembly, and a second switch included in said electric system and being arranged to be actuated in response to extension and contraction of said one of said cylinder assemblies for electrically opening said electric system and leaving said control valve in an operative position where only one of said head and rod ends of said second cylinder assembly is hydraulically pressurized.
Dependencies are inferred from the claim text.