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US 2003/0111656 A1Published application
Multiple screw jack
AssigneeDura Global Technologies, Inc.
InventorJohn Scott Erickson
Life of this patent
Estimating the term…
Abstract
A jack includes a motor, a gear assembly operably connected to the motor, a ram, and a plurality of screws driven by the gear assembly to move the ram.
Claims20
A jack comprising, in combination:
- a motor;
- a gear assembly operably connected to the motor;
- a ram;
- and
- a plurality of screw assemblies driven by the gear assembly to move the ram.
2 more elements
A jack comprising, in combination:
- a motor;
- a gear assembly having a pinion gear operably connected to and driven by the motor, and a plurality of screw gears, each screw gear driven by the pinion gear;
- a housing;
- a ram slidably received in the housing;
- a thrust plate secured to the housing;
- and
- a plurality of screw assemblies, each screw assembly operably connected to the ram, axially fixed with respect to the thrust plate, and driven by a screw gear to move the ram with respect to the thrust plate.
4 more elements
A jack comprising, in combination:
- a motor;
- a gear assembly having a pinion gear operably connected to and driven by the motor, and three screw gears, each screw gear driven by the pinion gear;
- a housing;
- a ram slidably received in the housing;
- a thrust plate secured to the housing;
- and
- three ball screws, each ball screw operably connected to the ram, axially fixed with respect to the thrust plate, and driven by a screw gear to move the ram with respect to the thrust plate.
4 more elements
Dependencies are inferred from the claim text.