Tension driven scissor lift
AssigneeOshkosh Corporation
InventorDevin J. Rosencrance
Life of this patent
Estimating the term…
Abstract
A lift device including a base, a platform that is repositionable relative to the base between a raised position and a lowered position, a scissor assembly coupling the base to the platform, and a booster positioned to apply an upward force on the scissor assembly when the platform is in the lowered position. The scissor assembly includes a scissor layer including a first scissor arm pivotally coupled to a second scissor arm, a tensile member coupled to the scissor layer, and a motor configured to apply a tensile force onto the tensile member to move the platform relative to the base.
Claims20
A lift device, comprising:
- a base;
- a platform that is repositionable relative to the base between a raised position and a lowered position;
- a scissor assembly coupling the base to the platform, the scissor assembly including:
- a scissor layer including a first scissor arm pivotally coupled to a second scissor arm;
- a tensile member coupled to the scissor layer;
- and
- a motor configured to apply a tensile force onto the tensile member to move the platform relative to the base;
- and
- a booster positioned to apply an upward force on the scissor assembly when the platform is in the lowered position.
A lift device, comprising:
- a base;
- a platform that is repositionable relative to the base between a fully lowered position and a fully raised position;
- and
- a scissor assembly coupling the base to the platform, the scissor assembly including:
- a plurality of scissor layers including a first scissor layer, the first scissor layer including a first arm pivotally coupled to a second arm, wherein the first arm is configured to rotate relative to the second arm about a middle axis that extends laterally;
- a first pulley coupled to the first arm and aligned with the middle axis;
- a second pulley coupled to the scissor assembly;
- a tensile member contacting the first pulley and the second pulley in both the fully lowered position and the fully raised position;
- and
- a motor configured to reduce a working length of the tensile member such that the first pulley moves longitudinally relative to the second pulley and the platform moves toward the fully raised position.
A lift device, comprising:
- a base;
- a platform that is repositionable relative to the base between a fully lowered position and a fully raised position;
- and
- a scissor assembly coupling the base to the platform, the scissor assembly including:
- a plurality of scissor layers including a first scissor layer, the first scissor layer including a first arm pivotally coupled to a second arm;
- a first pulley coupled to the first arm;
- a second pulley coupled to the second arm;
- a tensile member surrounding the first pulley and the second pulley such that (a) a first section of the tensile member extends between and engages the first pulley and the second pulley and (b) a second section of the tensile member extends between and engages the first pulley and the second pulley;
- and
- a motor configured to apply a tensile force onto the tensile member to move the platform toward the fully raised position.
Dependencies are inferred from the claim text.