Hand trucks and methods of constructing them
IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
|
출원번호 |
US-0276169
(2002-09-25)
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국제출원번호 |
PCT/US02/30317
(2002-11-12)
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§371/§102 date |
20021112
(20021112)
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국제공개번호 |
WO20/04033
(2004-04-22)
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발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
Reising, Ethington, Barnes, Kisselle &
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인용정보 |
피인용 횟수 :
5 인용 특허 :
8 |
초록
▼
A hand truck, with a vertical frame incorporating side rail channels supported on wheels, and a cargo carrying nose, has a longitudinal cross rail extrusion with terminal ends which extend into the channels. The extrusion in cross-section has top, bottom, and side exterior walls connected with inter
A hand truck, with a vertical frame incorporating side rail channels supported on wheels, and a cargo carrying nose, has a longitudinal cross rail extrusion with terminal ends which extend into the channels. The extrusion in cross-section has top, bottom, and side exterior walls connected with interior curved surfaces defining a longitudinally co-extending socket and threaded channel fasteners tap into the socket to anchor therein. Each side rail channel can be provided with walls cooperating with the rear side wall of the channel to form a rear channel and the wheel brackets connecting the wheels to the side rail channels can be secured by fasteners having parts received in the rear channels.
대표청구항
▼
1. In a hand truck having a vertical frame incorporating laterally spaced side rails with channels supported on wheels, a cargo carrying nose element connected with said frame, and at least one cross rail disposed longitudinally to said side rails having terminal ends which extend into said side rai
1. In a hand truck having a vertical frame incorporating laterally spaced side rails with channels supported on wheels, a cargo carrying nose element connected with said frame, and at least one cross rail disposed longitudinally to said side rails having terminal ends which extend into said side rail channels, the improvement wherein said cross rail in cross-section from one end to another comprises top, bottom, and side wall exterior wall surfaces connected with interior curved surfaces defining a longitudinally co-extending socket, said socket defining web walls connecting with said wall surfaces and curved surfaces, and threaded fasteners extending through said side rail channels into said ends of said cross rail and into said socket.2. The hand truck of claim 1 wherein said fasteners are self tapping screws.3. The hand truck of claim 2 wherein said interior curved surfaces are longitudinally partially open.4. The hand truck of claim 3, wherein said partially open interior curved surfaces in said cross rail are open from end to end and define a socket having a diameter diametrically less than the maximum thread of said screws.5. The hand truck of claim 1 wherein at least a pair of said web walls are provided to join said exterior wall surfaces with said interior curved surfaces.6. The hand truck of claim 1 in which one of said exterior wall surfaces of said cross rail is partly open along its length from end to end.7. The hand truck of claim 1 wherein at least one of said exterior wall surfaces is made up of spaced apart wall sections.8. The hand truck of claim 1 wherein at least one of said exterior wall surfaces is formed by spaced apart wall sections and said wall sections form part of integrated corner portions from which said web walls extend diagonally in a front to rear direction to connect to said interior curved surfaces.9. The hand truck of claim 1 in which said exterior side wall surfaces are each comprised of spaced apart side wall sections and said top wall surface is a continuous surface.10. The hand truck of claim 1 in which said bottom wall surface includes spaced apart bottom wall sections integrated with said side wall sections to form generally right angular confluent corner portions as viewed in cross-section extending from end to end of said cross rail and having said web walls extending diagonally from said corner portions.11. The hand truck of claim 10 wherein said bottom wall surface includes an intermediate bottom wall surface between said spaced apart bottom wall sections and spaced therefrom which connects with said interior curved surfaces by an upwardly vertically extending web wall.12. The hand truck of claim 10 wherein said confluent corner portions are arrow-shaped configurations as viewed in cross-section which incorporates said diagonally extending web walls.13. The hand truck of claim 1 wherein said side top and bottom wall surfaces have mergent corner portions at their confluences, with said web walls extending diagonally in a front to rear direction to brace said interior curved surfaces.14. A method of assembling a hand truck having a vertical frame with opposed side rail channels supported on wheels, and a cargo carrying nose connected with said frame, comprising:a) providing a longitudinally extending cross brace having ends sized to be received within said side rail channels and having front and rear exterior wall surfaces connected with surfaces defining a socket, said surfaces being connected to said exterior walls by front to rear extending web walls; b) placing said ends of the cross brace within said side rail channels; and c) threading screws supported by said side rails into said sockets to secure said cross rails in position. 15. The method of claim 14 comprising providing said cross brace with top and bottom exterior wall surfaces which merge with said front and rear exterior wall surfaces to form corner portions at their confluences with said web walls, said web walls extending diagonally and forming with said corner portions arrow-shaped bracing portions.16. The method of claim 14 wherein said side rail channels are formed with front and rear rail walls joined by a connecting wall, and providing pairs of vertically extending ribs spaced inwardly from said side rail connecting walls upon which said ends of the cross brace bear.17. The method of claim 14 wherein each side rail channel has a rear side wall surface and comprising providing each side rail channel with walls cooperating with said rear side wall surface of said side rail channel to form a rear channel section thereon, said wheels having brackets connecting them to said side rails and providing said brackets with inturned portions with fasteners having parts received in said rear channels sections to secure said brackets to said side rail channels.18. A hand truck having a generally vertical frame incorporating side rails with front, rear and side faces supported on wheels, a cargo carrying nose element projecting forwardly from said frame at the lower end thereof, and a laterally extending cross rail member connecting said side rails the improvement wherein:a) each side rail is provided with walls along the rear face of each side rail forming a rear channel; b) wheel brackets having laterally turned portions lying alongside said rear faces of said side rails, and front to rear extending legs lying alongside said side faces of said side rails and secured thereto for connecting said wheels to support said side rails; and c) front to rear extending fasteners having portions received in said laterally turned portions of said rear channels to secure said brackets to said side rail channels. 19. The hand truck of claim 18 wherein said hand truck has cross braces with ends received in said side rail channels, and each cross brace includes exterior top, bottom, front and rear side walls and an interior socket forming portion defining an end to end extending socket, each cross brace bottom wall including spaced apart bottom wall portions integrated with said side walls of each said crossbrace to form generally right angular confluent corner portions extending from end to end of each cross brace and having web walls extending diagonally from said confluent portions to connect with said socket forming portion, and fasteners extending through said side rail channels into said socket.20. A method of assembling a hand truck having a generally vertical frame incorporating side rails with front, rear, and interior and exterior side rail surfaces supported on wheels, a cargo carrying nose element projecting forwardly from said frame at the lower end thereof, and a cross rail member connecting said side rails having terminal ends which extend into said interior side rail surfaces, the improvement comprising:a) providing each side rail with walls along the rear wall surfaces of said side rails to form side rail rear channels; b) providing wheel brackets for connecting said wheels to said side rails having laterally turned portions; and c) securing front to rear extending fasteners having portions received in said side rail rear channels through said laterally turned portions of said brackets to join said brackets to said side rail rear channels.
이 특허에 인용된 특허 (8)
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Reese C. Harris (Hallock MN), Bedding plant transport device.
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Stallbaumer John J., Composite hand truck.
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Mortenson Carl N. (Midland MI), Hand truck assemblies and methods of constructing and operating them.
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Carter Charles E. (921 Beach Rd. Hampton VA 23664), Pivotable dolly for holding transporting and hanging a door.
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Mortenson Carl N. (Midland MI), Repositionable hand truck.
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Mortenson Carl N. (Midland MI), Two-wheeled hand trucks.
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Mortenson Carl N. (Midland MI), Two-wheeled hand trucks.
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Durham, Stephen P., Vertically folding hand truck and methods of its operation and construction.
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Josephsen, Greg, Convertible cart device.
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Yang, Cheng-Chiang; Wang, Shih-Chiang, Folding hand truck.
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Carlson, Paul; Carlson, Donna, Hand truck outrigger.
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Thomas, Charles M.; Thomas, Lynda D., Hand truck to transport horse related equipment.
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Drowanowski, Andy; Drowanowski, Birgit, Lever support assembly.
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