Operator-actuated elevating device
OwnerWalter McDonald, Norbert F. Seitel +1inventors
InventorsWalter McDonald, Norbert F. Seitel, John E. Ayres
Life of this patent
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Abstract
An elevatable operator-actuated lifting device, including a lower support frame and a platform section telescopically interfitted with the support frame as to be elevatable with respect thereto. Hydraulically actuated piston and cylinder means are provided for telescoping and de-telescoping the platform section with respect to the support frame, to enable elevation and lowering of the platform section. Means moveable with the platform section, including a manually actuated hydraulic pump, enable pressurization and de-pressurization of the piston and cylinder means, to thereby enable raising and lowering of the platform section by an operator standing thereupon.
Claims7
An elevatable operator-actuated lifting platform, comprising in combination:
- a lower support frame;
- a platform section including means for supporting said operator, telescopically interfitted with said support frame as to be elevatable with respect thereto;
- hydraulically actuated piston and cylinder means, for telescoping and de-telescoping said platform section away from and toward said support frame, to enable elevation and lowering of said platform section;
- said piston and cylinder means including a cylinder associated with and fixed with respect to one of said support frame and platform, and a piston fixed with respect to the other of said frame and platform;
- said piston being received within said cylinder and being axially displaceable outwardly from said cylinder by pressurization thereof to enable said elevation of said platform;
- means moveable with said platform for manually pressurizing and de-pressurizing said piston and cylinder means with said fluid, to enable raising and lowering of said platform by said operator;
- and wherein said manually actuated means moveable with said platform includes a reservoir of hydraulic fluid and a manually operable pumping means for providing said fluid to said cylinder;
- a first flow path being defined between said reservoir and said cylinder including said manually operable pumping means for effecting elevation of said platform section by pressurization of said cylinder;
- a second flow path being defined between said reservoir and pressurized cylinder for enabling return of fluid to said reservoir for lowering of said platform;
- and manually operable valve means moveable with said platform section for enabling operator selection between said first or second flow paths.
An elevatable operator-actuated lifting platform, comprising in combination;
- a lower support frame comprising a pair of generally U-shaped tubular members, said members being pivotably secured to one another at the open ends of said U, the bases of said U's comprising the lowermost supports of said frame;
- foldable support braces extending between said U-shaped tubular members at points intermediate said hinged portions and said bases to enable folding of said support frame, and thereby of said apparatus;
- a platform section including means for supporting said operator, telescopically interfitted with one of said U-shaped members as to be elevatable with respect thereto, and thereby to be elevatable with respect to said support frame;
- fluid actuated piston and cylinder means, for telescoping and de-telescoping said platform section away from and toward said support frame, to enable elevation and lowering of said platform section;
- and
- means moveable with said platform for manually pressurizing and de-pressurizing said piston and cylinder means with said fluid, to enable raising and lowering of said platform by said operator.
Dependencies are inferred from the claim text.