Multi-capacity cylinder
First Claim
Patent Images
1. A multi-capacity hydraulic system, comprisinga hollow cylinder closed by a cylinder head;
- an annular piston moveable within the hollow cylinder, the piston dividing the interior of hollow cylinder into a first chamber and a second chamber;
a hollow piston rod coupled to the piston, the piston rod aligned with an opening in the piston; and
a secondary rod moveable within the hollow piston rod, the secondary rod defining a third chamber in the hollow piston rod;
wherein the multi-capacity hydraulic cylinder is coupled to a fluid reservoir with a hydraulic circuit comprising a pressure sensitive switch, the switch movable between a first position directing a hydraulic fluid to the third chamber and second position directing fluid to the first chamber; and
wherein the third chamber has a cross-sectional area that is less than the cross-sectional area of the first chamber.
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Abstract
A multi-capacity hydraulic cylinder includes a hollow cylinder closed by a cylinder head, an annular piston moveable within the hollow cylinder to divide the interior of hollow cylinder into a first chamber and a second chamber, a hollow piston rod coupled to the piston and aligned with an opening in the piston, and a secondary rod moveable within the hollow piston rod to define a third chamber in the hollow piston rod, where the third chamber has a cross-sectional area that is less than the cross-sectional area of the first chamber.
21 Citations
14 Claims
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1. A multi-capacity hydraulic system, comprising
a hollow cylinder closed by a cylinder head; -
an annular piston moveable within the hollow cylinder, the piston dividing the interior of hollow cylinder into a first chamber and a second chamber; a hollow piston rod coupled to the piston, the piston rod aligned with an opening in the piston; and a secondary rod moveable within the hollow piston rod, the secondary rod defining a third chamber in the hollow piston rod; wherein the multi-capacity hydraulic cylinder is coupled to a fluid reservoir with a hydraulic circuit comprising a pressure sensitive switch, the switch movable between a first position directing a hydraulic fluid to the third chamber and second position directing fluid to the first chamber; and wherein the third chamber has a cross-sectional area that is less than the cross-sectional area of the first chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A hydraulic system, comprising:
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a multi-capacity cylinder comprising; a hollow cylinder closed by a cylinder head; an annular piston moveable within the hollow cylinder, the piston dividing the interior of hollow cylinder into a first chamber and a second chamber; a hollow piston rod coupled to the piston, the piston rod aligned with an opening in the piston; and a secondary rod moveable within the hollow piston rod, the secondary rod defining a third chamber in the hollow piston rod; a fluid reservoir; a hydraulic pump; and a hydraulic circuit coupling the multi-capacity cylinder to the fluid reservoir and the hydraulic pump; and
wherein the hydraulic circuit comprises a pressure sensitive switch, the switch movable between a first position directing the fluid to the third chamber and second position directing fluid to the first chamber. - View Dependent Claims (11, 12, 13, 14)
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Specification