US 4,978,132 AGranted

Pivotable hand truck apparatus

OwnerP. Henry Wilson, William A. Kelsoinventors

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Abstract

A pivotable hand truck for supporting or installing a heavy object is provided comprising an L-shaped structure, a pair of wheels secured to the L-shaped structure about which the structure may be pivoted between horizontal and vertical positions, and lifting means carried by the structure adapted to vertically adjust the object to a selected height above the floor surface. The lifting means is defined by a floor-engaging pedal affixed to the L-shaped structure, height-adjusting members carried by the structure, and activating means for activating the height-adjusting members when the pedal is moved between a non-operational position and an operational position. The activating means is defined by a rod member secured to the apparatus which engages the height-adjusting members, and coupling means mechanically coupling the rod member to the pedal. The coupling means is defined by a plurality of interconnecting lever arms, or, alternatively, a cable-and-pulley mechanism. In use, the operator depresses the floor-engaging fulcrum elevating one end of the structure. The depressing of the pedal activates the activating means which, in turn, activates the height-adjusting members which, in turn, engage the floor surface and elevate the opposite end of the structure, thereby variably elevating the object as desired.

Claims14

Dependent claims

A pivotable hand truck apparatus for holding and transporting a generally rectangular-shaped object comprising:

a structure for supporting the object by two edges comprising a first support member adapted to support a first edge of said object and a second support member adapted to support a second edge of said object, said second edge being positioned substantially transversely to said first edge, and said first support member being positioned substantially transversely to said second support member and being connected thereto at a point defining an apex;
means secured to said structure adjacent the apex about which the structure may be pivoted between substantially horizontal and vertical positions;
and p1 lifting means carried by said structure adapted to vertically adjust the object,
said support structure being adapted to first receive said object while disposed with the second support member and the second edge of the object supported thereby being in substantially horizontal position, said support structure thereafter being adapted to be pivoted about said pivoting means so that said first support member and said first edge of said object supported thereby are disposed in a substantially horizontal position and said second support member and said second edge of said object supported thereby are disposed in a substantially vertical position;
said lifting means being adapted to be thereafter activated to vertically adjust the object to a selected height above a floor surface, said lifting means comprising:
at least one pedal hingedly affixed to said first support member, said at least one pedal having a floor-engaging fulcrum arranged on the underside thereof, said pedal being adapted to be moved between a non-operational position and an operation position;
at least one height-adjusting member carried by said structure;
and
means for activating said height adjusting member when said pedal is moved from the non-operational position to the operational position.

6 more elements

A pivotable dolly for handling a door comprising:

an L-shaped structure for supporting the door by two edges,
said L-shaped structure for supporting the door by two edges,
said L-shaped structure comprising a short support member adapted to support a first short edge of the door and an elongated support member adapted to support a second long edge of the door, said second edge being positioned substantially transversely to said first edge, and said short support member being positioned substantially transversely to aid elongated support member and being connected thereto at a point defining an apex;
means secured to said L-shaped structure about which the dolly may be pivoted between substantially horizontal and vertical positions, said pivoting means comprising axle means connected to said elongated support member adjacent the apex and a pair of wheels attached to the axle means for rolling the dolly and for pivoting the L-shaped structure between substantially horizontal and vertical positions;
and
lifting means carried by the L-shaped structure adapted to vertically adjust the door, said lifting means comprising:
a pair of pedals hingedly affixed to said short support member, one pedal arranged on each side thereof, each of said pedals having a floor-engaging fulcrum arranged on the underside thereof, the pedal being adapted to be moved between a non-operational position and an operational position;
a pair of lifting legs carried by the L-shaped structure;
a rod member rotatably secured to the L-shaped structure, said rod member being disposed in a plane transverse to the plane of the L-shaped structure;
and
cable-and-pulley assembly mechanically coupling said pair of pedals to said rod member,
each of said pedals being adapted to be depressed independently or simultaneously of the other pedal whereby the floor-engaging fulcrum arranged on the underside thereof is urged against the floor surface elevating the ends of the short support member opposite the apex, the action of depressing one of the pedals substantially simultaneously activating the cable-and-pulley assembly which, in turn, rotates the rod member, the rod member being adapted to engage the lifting legs urging the lifting legs downwardly so that the lifting legs engage the floor surface and vertically elevate the apex of the L-shaped structure above the floor surface.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/407,111Filed 14 Sep 1989
Granted: 18 Dec 1990
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B62B 3/108
Characterised by supports specially adapted to objects of definite shape: the objects being plates, doors, panels, or the like
B62B 1/268
Characterised by supports specially adapted to objects of definite shape: the objects being plates, doors, panels or the like
E04F 21/0023
For mounting doors, windows or frames; their fitting: for mounting door leaves, window sashes or the like
Y10S 269/905
Work holders: work holder for doors and door frames