초록 ▼

A hand truck includes a main frame, a movable frame pivotally connected with the main frame, a wheel set, and a handle able to be connected with the main frame with its height adjustable or to be connected with a handle receiving short tube fixed upright on the main frame in case of transforming the

A hand truck includes a main frame, a movable frame pivotally connected with the main frame, a wheel set, and a handle able to be connected with the main frame with its height adjustable or to be connected with a handle receiving short tube fixed upright on the main frame in case of transforming the two wheeled hand tuck, two wheel supporters fixed under the main frame for additionally combining two independent wheels for transforming the two wheeled hand truck into a four wheeled one.

대표청구항 ▼

1. A hand truck comprising:a main frame consisting of two vertical side rods, two intermediate support rods positioned in parallel to and between said vertical side rods, an upper side rod combined with said two side rods and said two support rods, and an L-shaped elongate plate welded tightly with

1. A hand truck comprising:a main frame consisting of two vertical side rods, two intermediate support rods positioned in parallel to and between said vertical side rods, an upper side rod combined with said two side rods and said two support rods, and an L-shaped elongate plate welded tightly with a lower end of said two vertical side rods to form a lower side of said main frame, said two vertical side rods respectively provided with a position hole near its upper end;a wheel set consisting of two wheels rotatably combined with two ends of an axle and welded tightly with a curved-down section of said two support rods of said main frame;an elastic rod having a U-shaped portion and an extension extending from the two ends of said U-shaped portion, said extensions respectively extending in two slide grooves formed spaced apart in line in the upper side rod of said main frame, said extensions respectively having an inner end connected firmly with an inner end of a stop bar laid in said upper side rod of said main frame, an outer end of said stop bar inserting in one of plural position holes of two vertical sides of said handle so as to secure said handle at one of plural positions relative to said main frame;a movable frame shaped square and having a circumferential rod and two rods positioned in parallel in said circumferential rod, said circumferential rod having its lower side pivotally wrapped around by two sleeves fastened tightly on said elongate L-shaped rod;a U-shaped handle having two ends respectively able to be inserted in two end holes of the upper ends of said two side rods of said main frame, said handle further having plural position holes spaced apart in its two side portions and a hook hole in the two side portions, an elastic hook respectively fitted in two ends of the handle;a tubular wheel supporter respectively fixed downward at the upper end of said two side rods of said mainframe;a handle receiving short tube respectively fixed in line with said tubular wheel supporter on the upper end of said two side rods of said main frame;said movable frame swung to position flat on the ground with its lower side functioning as a pivot rotating in said two sleeves in nearly a right angle to said main frame for supporting a load placed thereon, said handle having its two sides fitted in the two upper end holes of said side rods of said main frame and adjusted in its height relative to said upper side rod of said main frame by handling said elastic rod, said hand truck used as a two wheeled hand truck by using said handle lowered a little to let said elongate L-shaped plate of said main frame move up from the ground and pushed to move forward to transport the load on said movable frame.2. The hand truck as claimed in claim 1, wherein said support rods of said main frame have a support groove formed on its upper end for supporting the upper side rod of said movable frame in a level condition for increasing the volume of a load possible to be placed thereon.3. The hand truck as claimed in claim 1, wherein two independent wheels are further provided to have a threaded rod to engage with said tubular wheel supporter, said main frame is swung down to let said two independent wheels combined with said wheel supporters to stand on the ground, said handle is separated from the two upper end holes of said two vertical side rods of said main frame, the two ends of said handle are inserted in the handle receiving short tubes at the two upper ends of said two side rods of said main frame, said elastic hooks in said two sides of said handle hook the position hole of said handle and said handle receiving short tube to secure said handle, said movable frame is swung on said main frame, with the upper side of said movable frame resting on the supporting grooves of said support rods, said main frame together with said movable frame supporting a load placed thereon, and thus said hand truck can be used as a four wheeled hand truck.