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US 9,169,090 B2Granted
Mobile loading dock with wheel assembly
OwnerGrant Leuminventor
Life of this patent
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Abstract
A mobile loading dock including a planar ramp member having an underside with a wheel assembly. The wheel assembly includes a tension spring, hydraulic member, a leg hingedly attached to the ramp underside and a wheel attached to the leg. The tension spring exerts a pulling force on the leg and wheel and the hydraulic member exerts a pushing force. The combined forces are directionally disposed to erect the wheel assembly when the lower end of the mobile loading dock is raised from a resting position in contact with the ground surface to a mobile position.
Claims15
A mobile loading dock comprising a planar ramp member having:
- a lower end terminating in a lower edge;
- an upper end including an upper edge;
- and
- a ramp underside having a wheel assembly thereupon, the wheel assembly having (a) a tension spring;
- (b) a hydraulic member;
- (c) a leg hingedly attached to the ramp underside;
- and (d) a wheel attached to the leg at an axle and disposed to contact a ground surface beneath the mobile loading dock;
- whereby the tension spring exerts a pulling force on the leg and the wheel and the hydraulic member exerts a pushing force on the leg and the wheel, the combined pulling force and pushing force being directionally disposed to erect the wheel assembly when the lower end of the mobile loading dock is raised from a resting position in contact with the ground surface to a mobile position not in contact with the ground surface.
5 more elements
Dependencies are inferred from the claim text.