IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0787616
(2007-04-17)
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등록번호 |
US-7523955
(2009-07-01)
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발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
15 인용 특허 :
6 |
초록
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A foldable wagon assembly movable between an open position and a folded position. A first hinge attaches the center and front sections and a second hinge attaches the center and rear sections. The front wheels are mounted beneath the front section and the rear wheels are mounted beneath the rear sec
A foldable wagon assembly movable between an open position and a folded position. A first hinge attaches the center and front sections and a second hinge attaches the center and rear sections. The front wheels are mounted beneath the front section and the rear wheels are mounted beneath the rear section. The distance from the lower surface of the bed to the points of contact of the front and rear wheels is equal to the center section width to establish the folded position (FIG. 9) with the front section and the rear section parallel to one another. The assembly is conveniently and easily convertible between an open position and a folded position making it promptly ready for use, transport, or storage and eliminates transportation and storage problems.
대표청구항
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What is claimed is: 1. A collapsible wagon assembly (20) movable between an open position and a folded position comprising; a bed (22) having an upper surface (24) and a lower surface (26) and including a front section (28) and a center section (30) and a rear section (32), a first hinge (34) attac
What is claimed is: 1. A collapsible wagon assembly (20) movable between an open position and a folded position comprising; a bed (22) having an upper surface (24) and a lower surface (26) and including a front section (28) and a center section (30) and a rear section (32), a first hinge (34) attaching said front section (28) to said center section (30), a second hinge (36) attaching said rear section (32) to said center section (30), said bed (22) having a generally rectangular periphery (38) and extending along a longitudinal axis (A) perpendicular to said hinges (34, 36), said center section (30) having a width along said longitudinal axis (A) between said first and second hinges (34, 36) for folding said bed (22) from an open position to a folded position, a pair of front wheels (40) mounted to said lower surface (26) beneath said front section (28) with each wheel extending to a radial point of contact for rolling engagement with a surface in said open position, said front wheels (40) being on opposite sides of said longitudinal axis (A) and both spaced along said longitudinal axis (A) a front distance (Xf) from said first hinge (34), a pair of rear wheels (44) mounted to said lower surface (26) beneath said rear section (32) with each wheel extending to a radial point of contact for rolling engagement along the surface in said open position, said rear wheels (44) being on opposite sides of said longitudinal axis (A) and spaced along said longitudinal axis (A) a rear distance (Xr) from said second hinge (36), said assembly (20) characterized by the distance from said lower surface (26) to said points of contact of said front and rear wheels (40, 44) being equal to said center section width (wc) to establish said folded position with said front section (28) and said rear section (32) parallel to one another as said points of contact of said front wheels (40) engage said lower surface (26) of said rear section (32) at said front distance (Xf) from said center section (30) and as said points of contact of said rear wheels (44) engage said lower surface (26) of said front section (28) at said rear distance (Xr) from said center section (30). 2. An assembly (20) as set forth in claim 1 wherein said points of contact of said front wheels (40) are spaced from said points of contact of said rear wheels (44) in said folded position. 3. An assembly (20) as set forth in claim 2 wherein said points of contact of said front wheels (40) are spaced along said longitudinal axis (A) from said points of contact of said rear wheels (44) in said folded position. 4. An assembly (20) as set forth in claim 3 wherein each of said first and second hinges (34, 36) includes interleaved leaves (106) and a shaft (108) extending through said leaves (106) for rotating said front section (28) about said first hinge (34) and said rear section (32) about said second hinge (36) to said folded position. 5. An assembly (20) as set forth in claim 2 wherein said rear distance (Xr) from said first hinge (34) is different than said front distance (Xf) from said second hinge (36) to space said front wheels (40) along said longitudinal axis (A) from said rear wheels (44) in said folded position. 6. An assembly (20) as set forth in claim 2 wherein said points of contact of said front wheels (40) are spaced from one another transversely to said longitudinal axis (A) a different distance than said points of contact of said rear wheels (44) are spaced from one another transversely to said longitudinal axis (A) in said folded position. 7. An assembly (20) as set forth in claim 6 wherein said points of contact of said front wheels (40) are spaced from one another transverse to said longitudinal axis (A) at a front wheel distance (Yf) and wherein said points of contact of said rear wheels (44) are spaced from one another transverse to said longitudinal axis (A) at a rear wheel distance (Yr). 8. An assembly (20) as set forth in claim 7 wherein said front wheel distance (Yf) is different than said rear wheel distance (Yr). 9. An assembly (20) as set forth in claim 1 including a lock (110) for retaining said sections (28, 30, 32) of said bed (22) in one of said open position with said sections (28, 30, 32) aligned with one another and said folded position with said front section (28) and said rear section (32) parallel to one another. 10. An assembly (20) as set forth in claim 9 wherein said lock (110) includes leaves (106) of said first and second hinges (34, 36) with center leaves (112) extending from said center section (30) and defining L shaped slots (114) in said center section leaves (112) with each slot having a parallel leg (116) parallel to said center section (30) and a transverse leg (118) transverse to said center section (30) for supporting shafts (108) for sliding movement in said slots between said open position with said shafts (108) in said parallel legs (118) and said sections (28, 30, 32) abutting one another and said folded position with said shafts (108) in said transverse legs (116) and said front and rear sections (28, 32) extending upwardly along said center leaves (112) for preventing rotation about said hinges (34, 36) thereby locking said sections (28, 30, 32) in said folded position. 11. An assembly (20) as set forth in claim 10 including a biasing device (120) interconnecting said center section (30) and each of said front and rear sections (28, 32) for biasing said front and rear sections (28, 32) upwardly relative to said center section (30) thereby urging said shafts (108) upward into said transverse legs (118) of said L shaped slots (114) in said open position. 12. An assembly (20) as set forth in claim 11 wherein said biasing device (120) is movable between one of a biasing position and a stored position. 13. An assembly (20) as set forth in claim 11 wherein said biasing device (120) includes at least one brace (122) having a U shape with legs (116, 118, 124) engaging said front and rear sections (28, 32) and a center base (126) spaced from said center section (30) in said biasing position. 14. An assembly (20) as set forth in claim 11 wherein said biasing device (120) includes at least one spring (128) for biasing said front and rear sections (28, 32) upwardly relative to said center section (30). 15. An assembly (20) as set forth in claim 11 wherein said biasing device (120) includes a connection shaft (130) extending from said center section (30) and through a center base (126) of a brace (122) for allowing rotation of said brace (122) between said biasing and stored positions, a spring (128) reacting between said shaft (108) and said brace (122) to bias said brace (122) toward said center section (30). 16. An assembly (20) as set forth in claim 11 wherein said center section (30) presents a recess (132) disposed in said lower surface (26) transverse to said longitudinal axis (A) for accepting said biasing device (120) in said stored position. 17. An assembly (20) as set forth in claim 1 including a plurality of side rails (84) for extending upwardly to define a retaining barrier (88) along said periphery (38) of said bed (22), said side rails (84) having a height (h) from said bed (22) to an upper distal rim (94) of said side rail (84) less than one half the distance between the side edges (56, 78) of said bed (22) for cradling said side rails (84) flat on said bed (22) in said folded position. 18. An assembly (20) as set forth in claim 17 wherein each of said first and second hinges (34, 36) includes interleaved leaves (106) and a shaft (108) extending through said leaves (106) for rotating said front section (28) about said first hinge (34) and said rear section (32) about said second hinge (36) to said folded position, a lock (110) includes said leaves (106) of said first and second hinges (34, 36) with center leaves (112) extending from said center section (30) and defining L shaped slots (114) in said center section leaves (112) with each slot having a parallel leg (116) parallel to said center section (30) and a transverse leg (118) transverse to said center section (30) for supporting said shafts (108) for sliding movement in said slots between said open position with said shafts (108) in said parallel legs (116) and said sections (28, 30, 32) abutting one another and said folded position with said shafts (108) in said transverse legs (118) and said front and rear sections (28, 32) extending upwardly along said center leaves (112) for preventing rotation about said hinges (34, 36) thereby locking said sections (28, 30, 32) in said folded position. 19. An assembly (20) as set forth in claim 18 including a biasing device (120) interconnecting said center section (30) and each of said front and rear sections (28, 32) for biasing said front and rear sections (28, 32) upwardly relative to said center section (30) thereby urging said shafts (108) upward into said transverse legs (118) of said L shaped slots (114) in said open position. 20. An assembly (20) as set forth in claim 19 wherein said biasing device (120) is movable between one of a biasing position and a stored position. 21. An assembly (20) as set forth in claim 19 wherein said biasing device (120) includes at least one brace (122) having a U shape with brace legs (124) engaging said front and rear sections (28, 32) and a center base (126) spaced from said center section (30) in said biasing position. 22. An assembly (20) as set forth in claim 19 wherein said biasing device (120) includes at least one spring (128) for biasing said front and rear sections (28, 32) upwardly relative to said center section (30). 23. An assembly (20) as set forth in claim 19 wherein said biasing device (120) includes a connection shaft (130) extending from said center section (30) and through a center base (126) of a brace (122) for allowing rotation of said brace (122) between said biasing and stored positions, a spring (128) reacting between said shaft (108) and said brace (122) to bias said brace (122) toward said center section (30). 24. An assembly (20) as set forth in claim 19 wherein said center section (30) presents a recess (132) disposed in said lower surface (26) transverse to said longitudinal axis (A) for accepting said biasing device (120) in said stored position. 25. An assembly (20) as set forth in claim 1 including a swivel connection (42) connecting each of said front wheels (40) to said front section (28) to allow each of said front wheels (40) to swivel about an axis perpendicular to said front section (28) of said bed (22). 26. An assembly (20) as set forth in claim 1 including a handle (68) pivotally having one end rotatably connected to said front section (28) and extending to a distal handle end (70). 27. A collapsible wagon assembly (20) movable between an open position and a folded position comprising; a bed (22) having an upper surface (24) and a lower surface (26) and including a front section (28) and a center section (30) and a rear section (32), a first hinge (34) attaching said front section (28) to said center section (30), a second hinge (36) attaching said rear section (32) to said center section (30), said first and second hinges (34, 36) including center leaves (112) extending from said center section (30), said first and second hinges (34, 36) includes interleaved leaves (106) and a shaft (108) extending through said leaves (112) for rotating said front section (28) about said first hinge (34) and said rear section (32) about said second hinge (36) to a folded position, said bed (22) being generally rectangular to extend along a longitudinal axis (A) perpendicular to said hinges (34, 36), a pair of front wheels (40) mounted to said lower surface (26) beneath said front section (28) for rolling engagement with a surface, a pair of rear wheels (44) mounted to said lower surface (26) beneath said rear section (32) of said bed (22) for rolling engagement along the surface, said assembly (20) characterized by a lock (110) including said leaves (106) of said first and second hinges (34, 36) with said center leaves (112) defining L shaped slots (114) in said center section leaves (112) with each slot having a parallel leg (116) parallel to said center section (30) and a transverse leg (118) transverse to said center section (30) for supporting said shafts (108) for sliding movement in said slots between said open position with said shafts (108) in said parallel legs (116) and said sections (28, 30, 32) abutting one another and said folded position with said shafts (108) in said transverse legs (118) and said front and rear sections (28, 32) extending upwardly along said center leaves (112) for preventing rotation about said hinges (34, 36) thereby locking said sections (28, 30, 32) in said folded position. 28. An assembly (20) as set forth in claim 27 including a biasing device (120) interconnecting said center section (30) and each of said front and rear sections (28, 32) for biasing said front and rear sections (28, 32) upwardly relative to said center section (30) thereby urging said shafts (108) upward into said transverse legs (118) of said L shaped slots (114) in said open position. 29. An assembly (20) as set forth in claim 28 wherein said biasing device (120) is movable between one of a biasing position and a stored position. 30. An assembly (20) as set forth in claim 28 wherein said biasing device (120) includes at least one brace (122) having a U shape with legs (116, 118, 124) engaging said front and rear sections (28, 32) and a center base (126) spaced from said center section (30) in said biasing position. 31. An assembly (20) as set forth in claim 28 wherein said biasing device (120) includes at least one spring (128) for biasing said front and rear sections (28, 32) upwardly relative to said center section (30). 32. An assembly (20) as set forth in claim 28 wherein said biasing device (120) includes a connection shaft (130) extending from said center section (30) and through said center base (126) of said brace (122) for allowing rotation of said brace (122) between said biasing and stored positions, a spring (128) reacting between said shaft (108) and said brace (122) to bias said brace (122) toward said center section (30). 33. An assembly (20) as set forth in claim 28 wherein said center section (30) presents a recess (132) disposed in said lower surface (26) transverse to said longitudinal axis (A) for accepting said biasing device (120) in said stored position. 34. A collapsible wagon assembly (20) movable between an open position and a folded position comprising; a bed (22) having an upper surface (24) and a lower surface (26) and including a front section (28) and a center section (30) and a rear section (32), a first hinge (34) attaching said front section (28) to said center section (30), a second hinge (36) attaching said rear section (32) to said center section (30), said bed (22) having a generally rectangular periphery (38) and extending along a longitudinal axis (A) perpendicular to said hinges (34, 36), said center section (30) having a width along said longitudinal axis (A) between said first and second hinges (34, 36) for folding said bed (22) from an open position to a folded position, a pair of front wheels (40) mounted to said lower surface (26) beneath said front section (28) with each wheel extending to a radial point of contact for rolling engagement with a surface in said open position, said front wheels (40) being on opposite sides of said longitudinal axis (A) and both spaced along said longitudinal axis (A) a front distance (Xf) from said first hinge (34), said front wheels (40) being spaced from one another transverse to said longitudinal axis (A) at a front wheel distance (Yf), a pair of rear wheels (44) mounted to said lower surface (26) beneath said rear section (32) with each wheel extending to a radial point of contact for rolling engagement along the surface in said open position, said rear wheels (44) being on opposite sides of said longitudinal axis (A) and spaced along said longitudinal axis (A) a rear distance (Xr) from said second hinge (36), said rear wheels (44) being spaced from one another transverse to said longitudinal axis (A) at a rear wheel distance (Yr), said points of contact of said front wheels (40) are spaced from said points of contact of said rear wheels (44) in said folded position, said front and rear sections (28, 32) parallel to one another as said points of contact of said front wheels (40) engage said lower surface (26) of said rear section (32) at said front distance (Xf) from said first hinge (34) and said points of contact of said rear wheels (44) engage said lower surface (26) of said front section (28) at said rear distance (Xr) from said second hinge (36) in said folded position, a plurality of side rails (84) for extending upwardly to define a retaining barrier (88) along said periphery (38), said side rails (84) having a height (h) from said bed (22) to an upper distal rim (94) of said side rail (84) less than one half the distance between said periphery (38) of said bed (22), said assembly (20) characterized by said folded position wherein a strap (136) surrounds said front and rear sections (28, 32) and secures said side rails (84) placed flat and abutting one another on top of said front and rear sections (28, 32) and cradled between said periphery (38) of said bed (22). 35. A collapsible wagon assembly (20) movable between an open position and a folded position comprising; a bed (22) having an upper surface (24) and a lower surface (26) and including a front section (28) and a center section (30) and a rear section (32), a first hinge (34) attaching said front section (28) to said center section (30), a second hinge (36) attaching said rear section (32) to said center section (30), said bed (22) having a generally rectangular periphery (38) and extending along a longitudinal axis (A) perpendicular to said hinges (34, 36), said center section (30) having a center section width (wc) along said longitudinal axis (A) between said first and second hinges (34, 36) for folding said bed (22) from an open position to a folded position, a pair of front wheels (40) mounted to said lower surface (26) beneath said front section (28) with each wheel extending to a radial point of contact for rolling engagement with a surface in said open position, said front wheels (40) being on opposite sides of said longitudinal axis (A) and both spaced along said longitudinal axis (A) a front distance (Xf) from said first hinge (34), said front wheels (40) being spaced from one another transverse to said longitudinal axis (A) at a front wheel distance (Yf), a swivel connection (42) connecting each of said front wheels (40) to said front section (28) to allow each of said front wheels (40) to swivel about an axis perpendicular to said front section (28) of said bed (22), a pair of rear wheels (44) mounted to said lower surface (26) beneath said rear section (32) with each wheel extending to a radial point of contact for rolling engagement along the surface in said open position, said rear wheels (44) being on opposite sides of said longitudinal axis (A) and spaced along said longitudinal axis (A) a rear distance (Xr) from said second hinge (36), said rear wheels (44) being spaced from one another transverse to said longitudinal axis (A) at a rear wheel distance (Yr), said points of contact of said front wheels (40) are spaced from said points of contact of said rear wheels (44) in said folded position, the distance from said lower surface (26) to said points of contact of said front and rear wheels (40, 44) being equal to said center section width (wc) to establish said folded position with said front section (28) and said rear section (32) parallel to one another as said points of contact of said front wheels (40) engage said lower surface (26) of said rear section (32) at said front distance (Xf) from said first hinge (34) as said points of contact of said rear wheels (44) engage said lower surface (26) of said front section (28) at said rear distance (Xr) from said second hinge (36), said center section (30) of said bed (22) being rectangular between outer edges (46) and between center hinge edges (48), said center section (30) including center walls (50) extending perpendicularly upward from said outer edges (46) thereof, said front section (28) having a front periphery (52) including a front hinge edge (54) and two oppositely disposed front side edges (56) and a handle edge (58), said first hinge (34) attaching said front hinge edge (54) of said front section (28) to a first of said center hinge edges (48) of said center section (30), said front section (28) including front side walls (60) extending perpendicularly upward from said side edges (56, 62) thereof, said front section (28) including a notched wall (64) extending perpendicularly upward from said handle edge (58) and defining a rectangular notch (66), a handle (68) pivotally having one end rotatably connected within said rectangular notch (66) of said front section (28) and extending to a distal handle end (70), said handle (68) including telescoping portions (72) for extending to an operating position and retractable to a storage position, said rear section (32) having a rear periphery (74) including a rear hinge edge (76) and two rear side edges (62) and a rear edge (78), said second hinge (36) attaching said rear hinge edge (76) of said rear section (32) to a second of said center hinge edges (48) of said center section (30), said rear section (32) including rear side walls (80) extending perpendicularly upward from said two rear side edges (62), said rear section (32) including a rear wall (82) extending perpendicularly upward from said rear edge (78), a plurality of side rails (84) each having a channel (86) overlapping said front side walls (60) and rear side walls (80) and extending upwardly to define a retaining barrier (88), a front rail (90) having a channel (86) overlapping said notched wall (64) and extending upwardly to define a retaining barrier (88) a rear rail (92) having a channel (86) overlapping said rear wall (82) and extending upwardly to define a retaining barrier (88), said side rails (84) having a height (h) from bottom of said channel (86) to upper distal rim (94) of said side rail (84) and said height (h) being less than half the distance between said side edges (56, 62), said front rail (90) having a rail width (wr) less than the distance between said front side edges (56), said rear rail (92) having a rail width (wr) less than the distance between said rear side edges (62), a lock (110) for retaining said sections (28, 30, 32) of said bed (22) in one of an open position and said folded position, a carrying device (134) mounted to said center section (30) for carrying said assembly (20) in said folded position, a strap (136) for surrounding said rear section (32) and said front section (28) to secure said assembly (20) in said folded position, and said strap (136) securing said side rails (84) placed flat and abutting one another on top of said front and rear sections (28, 32) and cradled between said periphery (38) of said bed (22). 36. An assembly (20) as set forth in claim 35 wherein said points of contact of said front wheels (40) are spaced along said longitudinal axis (A) from said points of contact of said rear wheels (44) in said folded position. 37. An assembly (20) as set forth in claim 35 wherein said rear distance (Xr) from said first hinge (34) is different than said front distance (Xf) from said second hinge (36) to space said front wheels (40) along said longitudinal axis (A) from said rear wheels (44) in said folded position. 38. An assembly (20) as set forth in claim 35 wherein said points of contact of said front wheels (40) are spaced from one another transversely to said longitudinal axis (A) a different distance than said points of contact of said rear wheels (44) are spaced from one another transversely to said longitudinal axis (A) in said folded position. 39. An assembly (20) as set forth in claim 38 wherein said points of contact of said front wheels (40) are spaced from one another transverse to said longitudinal axis (A) at a front wheel distance (Yf) and wherein said points of contact of said rear wheels (44) are spaced from one another transverse to said longitudinal axis (A) at a rear wheel distance (Yr). 40. As assembly (20) as set forth in claim 39 wherein said front wheel distance (Yf) is different than said rear wheel distance (Yr).
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