Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
349 words
A lift truck, for lifting a load and then transporting the load to a destination, comprising, in combination, a casing; a pair of parallel laterally spaced bars extending forwardly from said casing and defining a space therebetween, said bars being integral with said casing; wheels supporting each bar adjacent its free end; a dirigible wheel beneath and supporting said casing; a respective pair of jacks on each bar, one adjacent but rearwardly of the associated wheels and the other adjacent the junction of the associated bar with said casing, said jacks being extendable to lift said truck and a load thereon; a motor-driven hydraulic pump in said casing; a hydraulic motor operable to drive said dirigible wheel to move said lift truck over the ground; hydraulically operable steering means operatively associated with said dirigible wheel to steer the lift truck; said hydraulic pump being connected to said hydraulic motor, to said steering means and to said jacks; said steering means comprising a piston-cylinder hydraulic actuator, a rack connected to the piston of said hydraulic actuator, and a differential device connecting said rack to said dirigible wheel; a cantilever support extending rearwardly from said casing at the upper part of the latter; an operator''s seat on said support; and control handles, operating fluid flow control means iN the connections of said hydraulic pump to the hydraulically operated components of said lift truck, extending rearwardly from said casing, at a level slightly above said support, to a position adjacent said operator''s seat, whereby an operator occupying said seat may control the speed of movement of said lift truck, the direction of movement of said lift truck, and extension and retraction of said jacks; whereby an operator, seated on said operator''s seat, by manipulating said control handles, may direct said lift truck to extend said bars beneath a load supported on support blocks, extend said jacks to lift said lift truck and the load while the support blocks are removed, retract said jacks to reengage said wheels with the ground, and drive said lift truck to transport the load to its destination.
Claim 2
Dependent Claim
349 words
A lift truck, for lifting a load and then transporting the load to a destination, comprising, in combination, a casing; a pair of parallel laterally spaced bars extending forwardly from said casing and defining a space therebetween, said bars being integral with said casing; wheels supporting each bar adjacent its free end; a dirigible wheel beneath and supporting said casing; a respective pair of jacks on each bar, one adjacent but rearwardly of the associated wheels and the other adjacent the junction of the associated bar with said casing, said jacks being extendable to lift said truck and a load thereon; a motor-driven hydraulic pump in said casing; a hydraulic motor operable to drive said dirigible wheel to move said lift truck over the ground; hydraulically operable steering means operatively associated with said dirigible wheel to steer the lift truck; said hydraulic pump being connected to said hydraulic motor, to said steering means and to said jacks; said steering means comprising a piston-cylinder hydraulic actuator, a rack connected to the piston of said hydraulic actuator, and a differential device connecting said rack to said dirigible wheel; a cantilever support extending rearwardly from said casing at the upper part of the latter; an operator''s seat on said support; and control handles, operating fluid flow control means iN the connections of said hydraulic pump to the hydraulically operated components of said lift truck, extending rearwardly from said casing, at a level slightly above said support, to a position adjacent said operator''s seat, whereby an operator occupying said seat may control the speed of movement of said lift truck, the direction of movement of said lift truck, and extension and retraction of said jacks; whereby an operator, seated on said operator''s seat, by manipulating said control handles, may direct said lift truck to extend said bars beneath a load supported on support blocks, extend said jacks to lift said lift truck and the load while the support blocks are removed, retract said jacks to reengage said wheels with the ground, and drive said lift truck to transport the load to its destination.
Claim 3
Dependent Claim
35 words
A lift truck, as claimed in claim 1, including a valve interposed between said hydraulic pump and said hydraulic motor and operable to control the rate of flow of hydraulic fluid to said hydraulic motor.