IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0356054
(2003-02-01)
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발명자
/ 주소 |
- Robberson, James D.
- Robberson, Beverly J
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대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
9 |
초록
▼
A folding hand truck comprising an upper frame, a middle frame, a lower frame, a platform, and a dual wheel assembly. The lower end of the upper frame is rotatably connected to the upper end of the middle frame, and the upper end of the middle frame is rotatably connected to the upper end of the low
A folding hand truck comprising an upper frame, a middle frame, a lower frame, a platform, and a dual wheel assembly. The lower end of the upper frame is rotatably connected to the upper end of the middle frame, and the upper end of the middle frame is rotatably connected to the upper end of the lower frame, and the respective ends contain locking pins for locking the upper frame, middle frame, and lower frame in a substantially coplanar orientation. The platform is rotatably connected to the bottom of the lower frame such that the rear edge of the platform contacts the lower end of the lower frame in the operative position. The dual wheel assembly has a central bracket mounted to the rear side of the lower frame and has two rotatable wheel brackets capable of being locked in both operative and folded positions. When in the folded position, the platform folds into the lower frame, which folds into the middle frame. The upper frame folds into the middle frame over the lower frame between the wheels, which are then folded over the upper frame and locked in place, securing the hand truck in the folded position.
대표청구항
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1. A folding hand truck having storage and operative positions comprising:a. a middle frame having an upper end, a lower end, a front side, and a back side, further comprising a left tube and a right tube, with each of said left tube and said right tube having an upper end and a lower end; b. an upp
1. A folding hand truck having storage and operative positions comprising:a. a middle frame having an upper end, a lower end, a front side, and a back side, further comprising a left tube and a right tube, with each of said left tube and said right tube having an upper end and a lower end; b. an upper frame having an upper end, a lower end, a front side, and a back side, further comprising an inverted U-shaped tube having a left end and a right end, wherein said lower end of said upper frame is rotatably connected to said upper end of said middle frame, with locking means for locking said lower end of said upper frame to said upper end of said middle frame; c. a lower frame having an upper end, a lower end, a front side, and a back side, further comprising a left tube and a right tube, with each of said left tube and said right tube having an upper end and a lower end, wherein said upper end of said lower frame is rotatably connected to said lower end of said middle frame by hinge means, with locking means for locking the upper end of said lower frame to the lower end of said middle frame; d. a platform, having a rear edge, rotatably connected to said lower end of said lower frame by hinge means such that in the operative position, said rear edge of said platform extends below said lower end of said lower frame to said rear side of said lower frame; and e. a dual wheel assembly further comprising a left wheel and a right wheel, with each of said wheels being rotatably connected at its center to said lower frame by means for folding said wheels from a position wherein the plane of each of said wheels is parallel with said lower frame to a position wherein said plane of said wheels are parallel to each other and are perpendicular to the plane of said lower frame; f. wherein said means for locking said lower end of said upper frame to said upper end of said middle frame and said means for locking said upper end of said lower frame to said lower end of said middle frame comprise locking pins; g. wherein said left end of said upper frame aligns coaxially with said upper end of said left tube of said middle frame, and said right end of said upper frame aligns coaxially with said upper end of said right tube of said middle frame when said folding hand truck is in the operative position; h. wherein said lower end of said left tube of said middle frame aligns coaxially with said upper end of said left tube of said lower frame, and said lower end of said right tube of said middle frame aligns coaxially with said upper end of said right tube of said lower frame when said folding hand truck is in the operative position; and i. wherein said locking pins are mounted within and slide within said ends of said tubes such that: (i) one of said locking pins overlaps said left end of said upper frame and said upper end of said left tube of said middle frame; (ii) one of said locking pins overlaps said right end of said upper frame and said upper end of said right tube of said middle frame; (iii) one of said locking pins overlaps said lower end of said left tube of said middle frame and said upper end of said left tube of said lower frame; and (iv) one of said locking pins overlaps said lower end of said right tube of said middle frame and said upper end of said right tube of said lower frame. 2. The collapsible hand truck of claim 1, wherein said dual wheel assembly further comprises a horizontal U-shaped wheel assembly mounting bracket having a left end and a right end, with said wheel assembly mounting bracket attached to said rear side of said lower end of said lower frame, with the open side of the U facing away from said lower frame, and wherein said means for folding said wheels from a position substantially coplanar with said lower frame to a position perpendicular to the plane of said lower frame further comprise:a. a U-shaped left wheel bracket having a curvate end, with said curvate end rotatably attached to said left end of said wheel assembly mounting bracket by means of a pivot pin, wherein the open end of the U is oriented toward the centerline of said folding hand truck and wherein said left wheel is rotatably connected to the closed end of the U, and wherein said left wheel bracket further comprises a folded position hole and an operative position hole in a side of the U; b. a U-shaped right wheel bracket having a curvate end, with said curvate end rotatably attached to said right end of said wheel assembly mounting bracket by means of a pivot pin, wherein the open end of the U is oriented toward the centerline of said folding hand truck and wherein said right wheel is rotatably connected to the closed end of the U, and wherein said right wheel bracket further comprises a folded position hole and an operative position hole in a side of the U; c. a left wheel bracket locking pin which passes through a side of said wheel assembly mounting bracket and can pass through either said folded position hole of said left wheel bracket or said operative position hole of said left wheel bracket; and d. a right wheel bracket locking pin which passes through a side of said wheel assembly mounting bracket and can pass through either said folded position hole of said right wheel bracket or said operative position hole of said right wheel bracket. 3. The collapsible hand truck of claim 2 wherein said platform rotates into a coplanar orientation with said lower frame, wherein said lower frame then rotates into said middle frame, wherein said upper frame then rotates into said middle frame over said lower frame between said wheels, and wherein said wheels then rotate into a locked position over said upper frame.
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