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US 6,581,909 B2Granted
Simplified hydraulic circuit for a quick-rise hydraulic lifting jack
AssigneeClore Automotive, LLC
InventorMatthew A. Wixey
Life of this patent
Estimating the term…
Abstract
A hydraulic fluid circuit for a quick rise type lifting jack positions multiple valves that control two stages of the lifting operation of the jack in the same valve housing machined into a base of the jack and thereby reduces the costs involved in manufacturing and assembling the hydraulic circuit of the jack.
Claims20
A lifting jack having a hydraulic circuit comprising:
- a pump;
- a lifting cylinder;
- a lifting piston mounted in the lifting cylinder for reciprocating movement therein;
- a plurality of fluid conduits communicating the pump with the lifting cylinder;
- a valve housing interposed in the plurality of fluid conduits between the pump and the lifting cylinder, the valve housing having a first cavity containing a first spring biased valve element and a second cavity containing a second spring biased valve element, and the first and second cavities are extensions of each other.
2 more elements
A lifting jack having a hydraulic circuit comprising:
- a pump;
- a lifting cylinder;
- a lifting piston mounted in the lifting cylinder for reciprocating movement therein;
- a plurality of fluid conduits communicating the pump with the lifting cylinder;
- a valve housing interposed in the plurality of fluid conduits between the pump and the lifting cylinder, the valve housing having a first cavity containing a first spring biased valve element and a second cavity containing a second spring biased valve element, the first and second cavities are extensions of each other;
- and
- the first cavity has a center axis and the second cavity has a center axis and the first and second cavities are coaxial.
4 more elements
A lifting jack having a hydraulic circuit comprising:
- a pump;
- a lifting cylinder;
- a lifting piston mounted in the lifting cylinder for reciprocating movement therein;
- a plurality of fluid conduits communicating the pump with the lifting cylinder;
- a first valve element and a second valve element interposed in the plurality of fluid conduits between the pump and the lifting cylinder;
- and
- a spring between the first and second valve elements biasing the first and second valve elements away from each other.
4 more elements
A lifting jack having a hydraulic jack having a hydraulic circuit comprising:
- a pump;
- a lifting cylinder;
- a lifting piston mounted in the lifting cylinder for reciprocating movement therein;
- a plurality of fluid conduits communicating the pump with the lifting cylinder;
- a first valve element and a second valve element interposed in the plurality of fluid conduits between the pump and the lifting cylinder;
- a spring between the first and second valve elements biasing the first and second valve elements away from each other;
- the first valve element is contained inside a first cavity of a valve housing and the second valve element is contained inside a second cavity of a valve housing and the first and second cavities are extensions of each other;
- and
- the valve housing is contained inside a base of the lifting jack and the first and second cavities of the valve housing are both accessible from outside the base through an opening in the base that is closed by a removable plug.
6 more elements
Dependencies are inferred from the claim text.