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US 2004/0000664 A1Published application
Scissor lift mechanism
AssigneeSteel Equipment Specialists LLC
InventorDonald Watkins
Life of this patent
Estimating the term…
Abstract
A scissor lift mechanism for use on a coil car or the like, the lift having scissor legs connected to each other by a shaft. The lift is raised and lowered by a means for providing a generally vertical force to the shaft. The means may be provided by a hydraulic cylinder and a bell crank mechanism. The bell crank mechanism redirects the force from a hydraulic cylinder to a generally vertical force on a hinge connecting the scissor legs of the lift. The bell crank mechanism allows the strength of the lift to be maximized while retaining a low profile design.
Claims23
A scissor lift comprising:
- a frame;
- a deck moveable relative to the frame between an extended and a retracted position;
- a first leg supporting the deck on the frame having a first end pivotally attached to the frame, a second end slidably and pivotally attached to the deck, and an intermediate portion therebetween;
- a second leg supporting the deck on the frame having a first end slidably and pivotally attached to the frame, a second end pivotally attached to the deck, and an intermediate portion therebetween;
- wherein the second leg is transverse to the first leg and wherein the intermediate portions of the first leg and the second leg are pivotally connected about a first shaft;
- and
- a means for applying a generally vertical force to the first shaft to move the deck between a retracted position and an extended position.
4 more elements
A scissor lift comprising:
- a frame;
- a deck moveable relative to the frame between an extended and a retracted position;
- a first leg supporting the deck on the frame having a first end pivotally attached to the frame, a second end slidably and pivotally attached to the deck, and an intermediate portion therebetween;
- a second leg supporting the deck on the frame having a first end slidably and pivotally attached to the frame, a second end pivotally attached to the deck, and an intermediate portion therebetween;
- wherein the second leg is transverse to the first leg and the intermediate portions of the first leg and the second leg are pivotally connected about a shaft;
- at least one hydraulic cylinder pivotally attached to the frame;
- a bell crank mechanism attached to the frame, wherein the bell crank mechanism converts a force applied by actuation of the at least one hydraulic cylinder in a first direction to a force applied to the shaft in a second direction to move the deck between an extended and a retracted position.
4 more elements
Dependencies are inferred from the claim text.