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US 4,252,491 AGranted
Material lift platform
AssigneeJelco Service Co., Inc.
InventorJohn R. Hock
Life of this patent
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AssigneeJelco Service Co., Inc.
InventorJohn R. Hock
Estimating the term…
A hoist for loading and unloading cargo through a side or rear doorway of a van or truck slides from a stored position completely inside the vehicle to an operating position with a lift platform outside the vehicle that can be lowered and raised by an electric winch connected to the platform by cables. The hoist has a pair of generally horizontal telescoping parallel beams guiding a sliding yoke movable by means of the winch to raise and lower the platform through cable runs secured to arms extending from posts at both sides of the platform. Pivoting side support beams cooperating with stop members upon extension to operating position, and other safety features prevent improper operation. If very heavy loads are to be lifted on to a small vehicle, it may be desirable to brace the vehicle, as by means of a jack at or near the location of the lift platform to avoid tilting the vehicle. The material lift platform of the invention makes it possible to use a small truck or van to carry cargo that would otherwise require the use of a large truck, thus resulting in great fuel economy.
A material lift platform useful for loading and unloading a vehicle comprising a pair of telescoping generally horizontal parallel beams, a transverse yoke slidable along said beams by means of a pair of generally symmetrically arranged cables drawn by a single winch, and a platform suspended by cables extending from said yoke over pulley means at front ends of said telescoping beams.
A material lift platform useful for loading and unloading a vehicle comprising a pair of telescoping generally parallel beams, a transverse yoke slidable along said beams by means of a pair of generally symmetrically arranged cables drawn by a single winch, a platform plate suspended by cables extending from said yoke over pulley means at front ends of said telescoping beams, and a brace beam pivotally mounted near the front end of each telescoping beam for supporting said telescoping beams.
A material lift platform useful for loading and unloading a vehicle comprising a pair of telescoping generally parallel beams, a transverse yoke slidable along said beams by means of a pair of generally symmetrically arranged cables drawn by a single winch, and a platform plate connected to each of said telescoping beams by a telescoping post and suspended by cables extending from said yoke over pulley means at front ends of said telescoping beams.
In a vehicle, a material lift platform movable from a retracted condition within the vehicle to an extended position in which a platform is outside the vehicle for loading and unloading the vehicle by raising and lowering the platform plate, comprising a pair of generally parallel telescoping beams pivotally secured at a rear end to a vehicle wall, a yoke slidable along said telescoping beams and a platform plate connected to said slidable yoke by cable means whereby sliding movement of said yoke causes vertical movement of said platform plate, and support means extending between front end portions of said telescoping beams and a floor of the vehicle.
A material lift platform device comprising a pair of parallel beams adapted to be pivotally secured to vehicle frame structure, each said beam having a telescoping extension, rear ends of said extensions being interconnected by a cross beam carrying a winch mounted centrally between said extensions and connected by a pair of cables to a sliding yoke mounted for movement along said extensions, said sliding yoke being connected by further cables to a platform plate.
Dependencies are inferred from the claim text.