IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0431078
(2003-05-07)
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§371/§102 date |
20020716
(20020716)
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발명자
/ 주소 |
- Tomchak, Michael J.
- Albert, Barry R.
- Lupey, Mike
|
출원인 / 주소 |
|
대리인 / 주소 |
Eckert Seamans Cherin &
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인용정보 |
피인용 횟수 :
4 인용 특허 :
16 |
초록
▼
An improved wheelbarrow includes a pair of legs that are each configured as four-bar linkages and are collapsible. Each of the legs includes an advantageously simple lock for releasably locking the leg in extended and retracted positions. The wheelbarrow includes a frame assembly, a wheel, a tray, a
An improved wheelbarrow includes a pair of legs that are each configured as four-bar linkages and are collapsible. Each of the legs includes an advantageously simple lock for releasably locking the leg in extended and retracted positions. The wheelbarrow includes a frame assembly, a wheel, a tray, and a pair of handles. The frame assembly can be assembled by the manufacturer, and the wheelbarrow can then be provided as a kit in accordance with the present invention that can be assembled by the retailer or the consumer by simply attaching the wheel, the tray, and the handles to the frame assembly. A support block is disclosed which facilitates assembly and strengthens the legs.
대표청구항
▼
1. A wheelbarrow that can be disposed on a surface, the wheelbarrow comprising:a frame; at least a first wheel mounted on the frame; and a support; the support including at least a first leg mounted on the frame; the at least first leg being movable between an extended position and a retracted posit
1. A wheelbarrow that can be disposed on a surface, the wheelbarrow comprising:a frame; at least a first wheel mounted on the frame; and a support; the support including at least a first leg mounted on the frame; the at least first leg being movable between an extended position and a retracted position; the at least first leg including a first member, a second member, and a third member; the first and third members each being pivotably mounted on the frame; the second member being pivotably connected with each of the first and third members; a lock releasably retaining the at least first leg in at least one of the extended position and the retracted position; at least one of the first member, the second member, and the third member being pivotable about a pivot axis with respect to another of the first member, the second member, the third member, and the frame; the lock including a dog and at least a first receptacle; the dog being receivable in the at least first receptacle to releasably retain the at least first leg in the at least one of the extended and retracted positions; and at least one of the dog and the at least first receptacle being deflectable in a direction generally parallel with the pivot axis. 2. The wheelbarrow as set forth in claim 1, in whichthe second member is engageable with the surface when the at least first leg is in the extended position. 3. The wheelbarrow as set forth in claim 2, in whichthe lock extends between the second member and one of the first and third members, the dog being disposed on one of the second member and the one of the first and third members, the at least first receptacle being disposed on the other of the second member and the one of the first and third members. 4. The wheelbarrow as set forth in claim 1, in whichthe first, second, and third members are oriented substantially parallel with at least a portion of the frame when the at least first leg is in the retracted position. 5. The wheelbarrow as set forth in claim 1, in whichthe first, second, and third members are disposed generally flush with the frame when the at least first leg is in the retracted position. 6. The wheelbarrow as set forth in claim 1, in which the lock includes a second receptacle;the dog being receivable in the second receptacle to releasably retain the at least first leg in the other of the extended and retracted positions. 7. The wheelbarrow as set forth in claim 6, in whichthe pivot axis is disposed generally between the at least first and second receptacles. 8. The wheelbarrow as set forth in claim 3, in whichthe dog is a dimple protruding outwardly from the one of the second member and the one of the first and third members. 9. The wheelbarrow as set forth in claim 8, in whichthe dog protrudes outwardly from the one of the second member and the one of the first and third members in a direction generally parallel with the pivot axis. 10. The wheelbarrow as set forth in claim 3, in whichone of the second member and the one of the first and third members includes a buttress; the buttress being engaged with the other of the second member and the one of the first and third members when the at least first leg is in the one of the extended and retracted positions; the buttress resisting relative motion between the second member and the one of the first and third members to resist unintentional disengagement of the dog from the at least first receptacle. 11. The wheelbarrow as set forth in claim 10, in whichthe dog is disposed generally between the pivot axis and the buttress when at least first leg is in the one of the extended and retracted positions. 12. The wheelbarrow as set forth in claim 8, in whichat least one of the dog and the at least first receptacle includes an engagement surface, at least a portion of the engagement surface being oriented generally oblique to the pivot axis, the other of the at least one of the dog and the at least first receptacle being engageable with the at least portion of the engagement surface to remove the dog from the at least first receptacle when moving the at least first leg from the at least one of the extended and retracted positions toward the other of the at least one of the extended and retracted positions. 13. The wheelbarrow as set forth in claim 12, in which the at least portion of the engagement surface is arcuate.14. The wheelbarrow as set forth in claim 8, in which the dog is a generally rounded;the dog being structured and arranged to be removable from the at least first receptacle upon moving the at least first leg toward the other of the at least one of the extended and retracted positions with sufficient force to deflect at least one of the dog and the at least first receptacle away from the other of the dog and the at least first receptacle. 15. The wheelbarrow as set forth in claim 1, in which the at least first leg cooperates with the frame to function as a four-bar linkage.16. The wheelbarrow as set forth in claim 1, in which the frame includes a pair of ears oriented generally parallel with one another; one of the first and third members being mounted on the ears;the frame including a support block disposed between the ears, the support block being structured and arranged to resist deflection of at least one of the at least first leg and the pair of ears. 17. The wheelbarrow as set forth in claim 16, in which the support block is disposed against each of the ears.18. The wheelbarrow as set forth in claim 16, in which the one of the first and third members including a pair of lugs; the lugs being disposed between the ears; the support block being disposed between the lugs.19. The wheelbarrow as set forth in claim 16, in which the frame includes at least a first frame member; the ears extending from the at least first frame member; the support block including a mounting surface; the mounting surface being engageable with the at least first frame member.20. The wheelbarrow as set forth in claim 19, in whichthe support block includes a fastener hole formed therein, the fastener hole being structured and arranged to cooperate with a fastener extending through the at least first frame member. 21. A kit from which a wheelbarrow can be assembled, the kit comprising: a frame subassembly;the frame subassembly including a frame, an axle apparatus, at least a first leg, and at least a first tray brace connected together as an assembled unit, the at least first tray brace being pivotable with respect to the frame, and wherein said frame includes a pair of ears oriented generally parallel with one another, the at least first leg being mounted to the ears; a wheel mountable to the frame subassembly; a tray mountable to the frame subassembly; at least a first handle mountable to the frame subassembly; a support block disposed on the frame, the support block including a fastener hole formed therein; the support block disposed between the ears, the support block being structured and arranged to resist deflection of the ears; and a fastener; the fastener being fastenably cooperable with the fastener hole of the support block to mount the tray to the frame subassembly. 22. The kit as set forth in claim 21, in which the support block is mounted to the ears and is disposed against each of the ears.
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