Hydraulic piston and cylinder unit
AssigneeSimon Cella S.r.l.
InventorSergio Cella
Life of this patent
Estimating the term…
Abstract
An hydraulic piston and cylinder unit with a piston rod and first and second cylinders. The piston rod extends into the first cylinder, and the first cylinder extends into the second cylinder. The piston rod is connected to a first piston which divides the first cylinder into first and second chambers. A second piston, connected to the first cylinder, divides the second cylinder into first and second chambers. The second chambers of the first cylinder, and the first chamber of the second cylinder are in fluid communication such that an extension of the first cylinder causes a proportional extension of the second cylinder. A similar effect occurs during retraction of the cylinders.
Claims10
An hydraulic piston and cylinder unit comprising:
- a piston rod having first and second ends;
- a first cylinder having first and second ends;
- a second cylinder having first and second ends;
- the piston rod extending into the first cylinder through the first end of the first cylinder and being slidable relative thereto and the first cylinder extending into the second cylinder through the first end of the second cylinder and being slidable relative thereto;
- a first piston connected to the second end of the piston rod and slidable within the first cylinder, the first piston dividing the first cylinder into a first chamber adjacent to its first end and a second chamber adjacent to its second end;
- a second piston connected to the second end of the first cylinder and slidable within the second cylinder, the second piston dividing the second cylinder into a first chamber adjacent to its first end and a second chamber adjacent to its second end;
- the second chamber of the first cylinder and the first chamber of the second cylinder being in closed fluid communication with each other so that extension of the second cylinder relative to the first cylinder causes extension of the first cylinder relative to the piston rod;
- a fluid supply system for connecting and supplying an incompressible fluid to said second chamber of said first cylinder and thereby to said first chamber of said second cylinder, and including a purging system connected to said first chamber of the second cylinder for filling said chambers in said closed communication with said imcompressible fluid and compensating for fluid losses therein.
A double acting hydraulic piston and cylinder unit comprising:
- a piston rod having first and second ends;
- a first cylinder having first and second ends;
- a second cylinder having first and second ends;
- the piston rod extending into the first cylinder through the first end of the first cylinder and being slidable relative thereto and the first cylinder extending into the second cylinder through the first end of the second cylinder and being slidable relative thereto;
- a first piston connected to the second end of the piston rod and slidable within the first cylinder, the first piston dividing the first cylinder into a first chamber adjacent to its first end and a second chamber adjacent to its second end;
- a second piston connected to the second end of the first cylinder and slidable within the second cylinder, the second piston dividing the second cylinder into a first chamber adjacent to its first end and a second chamber adjacent to its second end;
- the first cylinder having passage means adjacent to its second end communicating the second chamber of the first cylinder with the first chamber of the second cylinder, the second chamber of the first cylinder and the first chamber of the second cylinder being in use, filled with incompressible fluid;
- a flexible supply line connected directly to the outer end of said second cylinder for supplying fluid pressure directly to the second chamber of the second cylinder, whereby in use, the piston rod and the first and second cylinders can be extended simultaneously from retracted conditions relative to one another by applying fluid pressure to the second chamber of the second cylinder and can be retracted simultaneously from extended conditions relative to one another by applying fluid pressure to the first chamber of the first cylinder.
Dependencies are inferred from the claim text.