Extendable chassis leveling
AssigneeOshkosh Corporation
InventorWenton S. Miller
Life of this patent
Estimating the term…
Abstract
A lift device includes a chassis including a center frame section, a turntable supported on and rotatably coupled to the center frame section, a boom assembly coupled to the turntable, a platform coupled to the boom assembly so that the boom assembly is configured to selectively raise and lower the platform, a frame section including a pair of axle arms coupled to the a mounting hub so that the pair of axle arms are extendable relative to the center frame section, and an oscillating axle assembly coupled between the mounting hub and the center frame section, so that the frame section is allowed to pivot relative to the center frame section about a pivot axis.
Claims20
A lift device, comprising:
- a chassis including a center frame section;
- a turntable supported on and rotatably coupled to the center frame section;
- a boom assembly coupled to the turntable;
- a platform coupled to the boom assembly so that the boom assembly is configured to selectively raise and lower the platform;
- an axle arm coupled to the center frame section so that the axle arm is extendable relative to the center frame section;
- a tractive element coupled to the axle arm by a leveling assembly;
- and
- a steering spindle coupled to the tractive element;
- the leveling assembly includes:
- a cylinder directly coupled to or integrally formed with the steering spindle;
- a rod at least partially arranged within the cylinder and extending outwardly from the cylinder, wherein the rod includes a piston arranged within the cylinder that divides an internal volume of the cylinder into a first chamber and second chamber;
- and
- a steering actuator coupled between the axle arm and the cylinder.
A lift device, comprising:
- a chassis;
- a turntable supported on and rotatably coupled to the chassis;
- a boom assembly coupled to the turntable;
- a platform coupled to the boom assembly so that the boom assembly is configured to selectively raise and lower the platform;
- an axle arm coupled to the chassis so that the axle arm is extendable relative to the chassis between a retracted position and an expanded position;
- a tractive element coupled to the axle arm by a leveling assembly;
- and
- a drive hub assembly coupled to the tractive element, wherein the drive hub assembly includes a steering spindle and a drive motor;
- the leveling assembly includes:
- a cylinder coupled to the drive hub;
- a rod at least coupled to the cylinder and extending at least partially into
- the cylinder, wherein the rod includes a piston arranged within the cylinder that divides an internal volume of the cylinder into a first chamber and second chamber;
- and
- a steering actuator coupled between the axle arm and the drive hub assembly.
A lift device, comprising:
- a chassis including a center frame section;
- a turntable supported on and rotatably coupled to the center frame section;
- a boom assembly coupled to the turntable;
- a platform coupled to the boom assembly so that the boom assembly is configured to selectively raise and lower the platform;
- an axle arm coupled to the center frame section so that the axle arm is extendable relative to the center frame section;
- a tractive element coupled to the axle arm by a leveling assembly;
- a steering spindle coupled to the tractive element;
- the leveling assembly includes:
- a cylinder directly coupled to or integrally formed with the steering spindle;
- and
- a rod at least partially arranged within the cylinder and extending outwardly from the cylinder, wherein the rod includes a piston arranged within the cylinder that divides an internal volume of the cylinder into a first chamber and second chamber;
- and
- a controller configured to selectively supply fluid to or remove fluid from the first chamber and the second chamber to raise or lower the cylinder, and thereby the tractive element, relative to the axle arm.
Dependencies are inferred from the claim text.