초록 ▼

A collapsible hand truck for supporting large and heavy objects such as entrance way doors. The hand truck being able to adjust to varying load center of gravities, thereby allowing a single individual to handle extremely heavy loads. A tiltable main frame which can rotate about a fulcrum point allo

A collapsible hand truck for supporting large and heavy objects such as entrance way doors. The hand truck being able to adjust to varying load center of gravities, thereby allowing a single individual to handle extremely heavy loads. A tiltable main frame which can rotate about a fulcrum point allowing even the heaviest loads to be shifted from a vertical to a horizontal plane with minimal effort by the individual. The main frame is supported by a pair of struts and the length of the frame is adjustable to compensate for doors of various lengths and center of gravities. A front strut having a pair of loading wheels and a rear strut having auxiliary caster wheels for maneuverability. The struts being rotative to each other.

대표청구항 ▼

1. A door handling hand truck comprising:(a) an elongate substantially rectangular pivotable support frame having a top end and a bottom end, a top surface and a bottom surface, a lip extruding outwardly from the bottom end; (b) a pair of elongate side beams having multiple apertures at both the top

1. A door handling hand truck comprising:(a) an elongate substantially rectangular pivotable support frame having a top end and a bottom end, a top surface and a bottom surface, a lip extruding outwardly from the bottom end; (b) a pair of elongate side beams having multiple apertures at both the top and bottom ends; (c) an elongate center beam parallel and equidistantly interposed between the side beams; (d) a plurality of braces positioned perpendicularly to the beams for connecting the beams into a unitary frame structure; (e) adjustable extension beams telescopically slidable from both ends of the side beams, multiple apertures defined in the beams, whereby the frame can extend to varying lengths thereby accommodating doors having varying center of gravities; (f) removable retaining pegs insertable in the apertures for maintaining the beams at varying lengths; (g) a pair of locking bars, each having a circular opening therein, each locking bar mounted to the bottom surface of each side beam at a position nearer to the bottom end; (h) a pair of adjustable strut members, a front strut member and a rear strut member, each substantially rectangular and rotatively connected to each other at their upper ends; (i) a pair of main wheels having means for attaching to the front strut member for moving the hand truck; (j) a pair of auxiliary wheels having means for attaching to the rear strut member for providing support and 360 degree rotation; (k) a fulcrum assembly having means for connecting the frame and struts to each other, the frame being pivotable about the assembly from a vertical plane to a horizontal plane, the strut members rotative about the assembly, whereby the center of gravity of a door being handled is pivotable about the assembly; (l) a chain extending between the strut members for restricting the distance of travel therebetween; (m) a locking rod passing through the circular openings, for securing the bottom surface of the frame to the front strut member; and (n) a pair of eyelets mounted on the bottom surface of the top and bottom ends of the center beam, for receiving means connecting the rear and front strut members to the frame when the frame is in the horizontal plane, whereby a door being removed from a doorway onto the hand truck will be caused to pivot between vertical and horizontal planes while allowing the weight of the top portion of the door to be in equilibrium with the weight of the bottom portion of the door about the fulcrum point.