초록 ▼

A ground-movable load-lifting vehicle for lifting a load over ground. The vehicle comprises a platform bed, a ground-movable carriage, and an extendible scissor linkage assembly supporting the platform bed spacedly over the carriage. A hydraulic ram system enables power extension of the scissor link

A ground-movable load-lifting vehicle for lifting a load over ground. The vehicle comprises a platform bed, a ground-movable carriage, and an extendible scissor linkage assembly supporting the platform bed spacedly over the carriage. A hydraulic ram system enables power extension of the scissor linkage assembly against the bias of a load supported by said platform bed. The carriage further includes peripheral ground-engageable pivotal casters, rotatably mounted to the carriage in spaced apart fashion, and a pair of ground-engageable drive wheel assemblies, mounted for relative movement to a central portion of the carriage, wherein the drive wheel assemblies provide omnidirectional displacement capability for this load-lifting vehicle. A power unit, controlled by an electronic circuit, powers both the hydraulic rams of the scissor linkage assembly and the drive wheel assemblies.

대표청구항 ▼

1. A ground-movable carriage for supporting spacedly over ground a liftable platform with an extendable scissor linkage assembly, said carriage including:a) a rigid main frame, defining a front portion, a rear portion, and a middle portion intermediate said front portion and said rear portion; b) a

1. A ground-movable carriage for supporting spacedly over ground a liftable platform with an extendable scissor linkage assembly, said carriage including:a) a rigid main frame, defining a front portion, a rear portion, and a middle portion intermediate said front portion and said rear portion; b) a first pair of ground-engageable front pivotal casters, rotatably mounted to said main frame front portion in laterally spaced apart fashion; c) a second pair of ground-engageable rear pivotal casters, rotatably mounted to said main frame rear portion in laterally spaced fashion; d) a ground-engageable omnidirectional drive wheel assembly, mounted for relative movement to said main frame middle portion; and c) a power unit, operatively connected to said drive wheel assembly and powering said drive wheel assembly in moving said carriage rollingly over ground; wherein said drive wheel assembly can provide full turn rotation of said carriage without fore and aft motion; wherein said drive wheel assembly includes a first wheel axle and a second wheel axle, each of said first wheel axle and second wheel axle being independently articulated to said carriage main frame by first pivot mount system and by a second pivoted suspension system; and further including a first reduction gear assembly, connected to said first wheel axle, and a second reduction gear assembly, connected to a said second wheel axle; and wherein said power unit includes a first motor, connected to said first wheel axle and cooperating with said first reduction gear assembly, and a second motor, connected to said second wheel axle and cooperating with said second reduction gear assembly; at least one of said first motor and second motor providing reversible torque output. 2. A carriage as in claim 1,further including an electronic circuit, operatively interconnecting said first and second motors, said first and second reduction gears, and said remote control device, said electronic circuit controlling direction of rotation of each of said first wheel axle and second wheel axle. 3. A ground-movable load-lifting vehicle for lifting a load over ground, said vehicle comprising:a) a platform bed, for supporting and containing a load spacedly over ground; b) a ground-movable carriage, including a rigid main frame defining a front portion, a rear portion, and a middle portion intermediate said front portion and said rear portion; c) a scissor linkage assembly, supporting said platform bed spacedly over said carriage, said scissor linkage assembly including a first pivot mount, pivotally interconnecting a top end of said scissor linkage assembly to said platform bed, a second pivot mount, pivotally interconnecting a bottom end of said scissor linkage assembly to said carriage, and ram means for power extending said scissor linkage assembly against the bias of the load supported by said platform bed; wherein said carriage further includes: a first pair of ground-engageable front pivotal casters, rotatably mounted to said main frame front portion in laterally spaced apart fashion; a second pair of ground-engageable rear pivotal casters, rotatably mounted to said main frame rear portion in laterally spaced fashion; d) a ground-engageable omnidirectional drive wheel assembly, mounted for relative movement to said main frame middle portion; and c) a power unit, operatively connected to said drive wheel assembly and powering said drive wheel assembly in moving said carriage rollingly over ground; wherein said drive wheel assembly can provide full turn rotation of said carriage without fore and aft motion; wherein said drive wheel assembly includes a first wheel axle and a second wheel axle, each of said first wheel axle and second wheel axle being independently articulated to said carriage main frame by a first pivot mount system and by a second pivoted suspension system. 4. A load lifting vehicle as in claim 3,further including a manual remote-control device, mounted to said platform bed and operatively connected to said power unit and remotely actuating said drive wheel assembly. 5. A load-lifting vehicle as in claim 4,further including a first reduction gear assembly, connected to said first wheel axle, and a second reduction gear assembly, connected to said second wheel axle; and wherein said power unit includes a first motor, connected to said first wheel axle and cooperating with said first reduction gear assembly, and a second motor, connected to said second wheel axle and cooperating with said second reduction gear assembly; at least one of said first motor and second motor providing reversible torque output. 6. A load-lifting vehicle as in claim 5,further including an electronic circuit, operatively interconnecting said first and second motors, said first and second reduction gears, and said remote control device, said electronic circuit controlling direction of rotation of each of said first wheel axle and second wheel axle. 7. A load-lifting vehicle as in claim 4,wherein said ram means are operatively connected to said power unit and to said remote control device, said power unit controlling said ram means concurrently with said drive wheel. 8. A ground movable-load-lifting vehicle for lifting a load over ground, said vehicle comprising:a) a platform bed, for supporting and containing a load spacedly over ground; b) a ground-movable carriage, including a rigid main frame defining a front portion, a rear portion, and a middle portion intermediate said front portion and said rear portion; d) a scissor linkage assembly, supporting said platform bed spacedly over said carriage, said scissor linkage assembly including a first pivot mount, pivotally interconnecting a top end of said scissor linkage assembly to said platform bed, a second pivot mount, pivotally interconnecting a bottom end of said scissor linkage assembly to said carriage, and ram means for power extending said scissor linkage assembly against the bias of the load supported by said platform bed; wherein said carriage further includes: a first pair of ground-engageable front pivotal casters, rotatably mounted to said main frame front portion in laterally spaced apart fashion; a second pair of ground-engageable rear pivotal casters, rotatably mounted to said main frame rear portion in laterally spaced fashion; d) a ground-engageable omnidirectional drive wheel assembly, mounted for relative movement to said main frame middle portion; and c) a power unit, operatively connected to said drive wheel assembly and powering said drive wheel assembly in moving said carriage rollingly over ground; wherein said drive wheel assembly can provide full turn rotation of said carriage without fore and aft motion; further including tilt means, cooperating with said drive wheel assembly in enabling downward tilt of said drive wheel assembly to accommodate uneven ground surface. 9. A ground-movable load-lifting vehicle for lifting a load over ground, said vehicle comprising:a) a platform bed, for supporting and containing a load spacedly over ground; b) a ground-movable carriage, including a rigid main frame defining a front portion, a rear portion, and a middle portion intermediate said front portion and said rear portion; c) a scissor linkage assembly, supporting said platform bed spacedly over said carriage, said scissor linkage assembly including a first pivot mount, pivotally interconnecting a top end of said scissor linkage assembly to said platform bed, a second pivot mount, pivotally interconnecting a bottom end of said scissor linkage assembly to said carriage, and ram means for power extending said scissor linkage assembly against the bias of the load supported by said platform bed; wherein said carriage further includes: a first pair of ground-engageable front pivotal casters, rotatably mounted to said main frame front portion in laterally spaced apart fashion; a second pair of ground-engageable rear pivotal casters, rotatably mounted to said main frame rear portion in laterally spaced fashion; d) a ground-engageable omnidirectional drive wheel assembly, mounted for relative movement to said main frame middle portion; and e) a power unit, operatively connected to said drive wheel assembly and powering said drive wheel assembly in moving said carriage rollingly over ground; wherein said drive wheel assembly can provide full turn rotation of said carriage without fore and aft motion; further including an electronic circuit, integral to said carriage main frame and operatively interconnecting said ram means and said power unit, wherein said drive wheel assembly of the carriage and said ram means of the scissor linkage assembly are selectively controled by said electronic circuit independently of one another.