Hydraulic constant force caster
AssigneeRoss Design & Engineering, Inc.
InventorJack R. Plate
Life of this patent
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Abstract
A caster system wherein a constant force is applied to the caster for load support purposes. A plurality of casters are interconnected by a fluid conduit system and each caster includes an expansible chamber motor for adjusting the vertical position of the caster. A fluid pressurizing unit communicates with the conduits and an adjustable force compression spring selectively varies the biasing force on the piston to adjust the equal force imposed upon each caster wheel.
Claims4
A caster system characterized by a plurality of casters each exerting the same force upon an object supported by the casters comprising, in combination, a plurality of casters each having a support plate supporting a housing, an expansible chamber motor within said housing having a piston, a caster wheel operatively mounted upon said piston for vertical movement thereby, a conduit system simultaneously interconnecting said expansible chamber motors of said casters so that the pressure within all of said chamber motors is equal and fluid pressurizing means in communication with said conduit system.
Dependencies are inferred from the claim text.