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US 7,478,704 B2Granted
Lift cart
OwnerClyde M. Churchinventor
Life of this patent
Estimating the term…
Abstract
A wheeled cart includes a lift platform mounted for vertical movement on a frame, an actuating system for effecting movement of the platform, a brake system acting against a wheel to prevent movement of the cart, a tank containing compressed air and an air conduit system for directing compressed air to the actuating system and the brake system.
Claims5
A lift cart comprising:
- a frame,
- a wheel on said frame permitting the cart to be moved over a surface,
- brake means on said frame and adapted to act against said wheel to prevent movement of the cart over the surface,
- a lift platform mounted on said frame for vertical movement thereon,
- an actuating system for effecting movement of said platform,
- a tank for containing compressed air mounted on said frame, and
- air conduit means for directing compressed air from said tank to said brake means and said actuating system, said actuating system comprising
- a reservoir containing hydraulic fluid,
- a lift cylinder,
- a hydraulic fluid conduit connecting said reservoir and said lift cylinder, and
- a pneumatically actuated shut-off valve in said hydraulic fluid conduit,
- a manually actuated valve in said air conduit means for controlling the flow of compressed air to said reservoir,
- whereby compressed air from the tank may controllably be admitted to the reservoir containing hydraulic fluid for actuating the lift cylinder and effecting movement of the platform.
10 more elements
A lift cart comprising:
- a frame,
- a lift platform mounted on said frame for vertical movement thereon,
- an actuating system for effecting movement of said platform,
- a tank for containing compressed air mounted on said frame,
- air conduit means for directing compressed air to said actuating system,
- said actuating system comprising
- a reservoir containing hydraulic fluid,
- a lift cylinder,
- a hydraulic fluid conduit connecting said reservoir and said cylinder, and
- a pneumatically actuated shut-off valve in said hydraulic fluid conduit,
- a first manually actuated valve in said air conduit means for controlling the flow of compressed air to said reservoir, and
- a second manually actuated valve in said air conduit means for controlling the flow of compressed air to said shut-off valve
- whereby compressed air from the tank may controllably be admitted to the reservoir containing hydraulic fluid for actuating the lift cylinder and effecting movement of the platform.
10 more elements
Dependencies are inferred from the claim text.