IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0178926
(2002-06-25)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Browdy and Neimark, P.L.L.C.
|
인용정보 |
피인용 횟수 :
21 인용 특허 :
13 |
초록
▼
A hand truck comprising a platform fitted at opposed side walls thereof with a handle-engaging assembly, and a handle assembly comprising two parallel spaced arms, each fitted at its lower end with a platform engaging assembly. The handle is displaceable between three respective positions, namely a
A hand truck comprising a platform fitted at opposed side walls thereof with a handle-engaging assembly, and a handle assembly comprising two parallel spaced arms, each fitted at its lower end with a platform engaging assembly. The handle is displaceable between three respective positions, namely a first position in which the handle is substantially up-right and which position is a pull/push position, a second position in which the handle is inclined and useful as a push position, and a third position in which the handle is and slidably received within the platform.
대표청구항
▼
1. A hand truck comprising:(a) a platform having a top item-receiving surface extending between two side walls and having a fore end and a rear end, said platform being formed with two parallel arm receiving recesses, extending along the side walls one adjacent each side wall; and said platform bein
1. A hand truck comprising:(a) a platform having a top item-receiving surface extending between two side walls and having a fore end and a rear end, said platform being formed with two parallel arm receiving recesses, extending along the side walls one adjacent each side wall; and said platform being fitted with an arm connector at a rear end of each side wall for pivotally connecting a handle arm; said platform further comprising several casters; (b) a handle assembly comprising two parallel spaced handle arms, each coupled at its lower end with a corresponding platform engaging assembly so as to allow relative linear displacement between each platform engaging assembly and respective handle arm; said handle assembly being pivotally displaceable between three respective positions: a first position in which the handle arms are substantially up-right and which position is a pull/push position, a second position in which the handle arms are inclined and which position is useful as a push position, and a third position in which the handle arms are slidably displaceable along the side walls of the platform so as to be receivable within the arm receiving recesses of the platform. 2. A hand truck according to claim 1, wherein the handle is a U-shaped member.3. A hand truck according to claim 1, wherein each platform engaging assembly is extractable from the respective handle arm and is spring biased to be in a retracted position.4. A hand truck according to claim 1, wherein each arm connector is formed with an arm coupler and with an arced path formed with two pin arresting recesses for arresting a position pin of a respective handle arm, said recesses corresponding with the first and second positions of the handle assembly.5. A hand truck according to claim 4, wherein each arm connector further comprises an arm supporting portion such that when the hand truck is pushed while the handle assembly is at its first position, a corresponding portion of the handle arm bears against the arm supporting portion.6. A hand truck according to claim 5, wherein the arm supporting portion is a wall surface.7. A hand truck according to claim 6, wherein at the first position, the handle arms of the handle assembly are parallel and in close proximity with the wall surface.8. A hand truck according to claim 4, wherein each arced path extends from a lower end of the corresponding arm connector opposite and in continuation with a corresponding arm receiving recess of the platform.9. A hand truck according to claim 4, wherein the arced path has an altering radius and wherein at least at a lower end thereof and either of at said pin arresting recesses, the radius is substantially invariant.10. A hand truck according to claim 9, wherein the substantially invariant radius corresponds with a distance between the position pin of a respective arm of the handle assembly and a center of rotation of the platform engaging assembly.11. A hand truck according to claim 4, wherein each platform engaging assembly comprises an extractable hinging member and each handle arm is fitted with a laterally projecting pin, said pin is slidable receivable within the arced path of the arm connector and is engageable with the corresponding pin arresting recess of the arced path.12. A hand truck according to claim 11, wherein the hinging member is pivotally engageable by the arm coupler of the arm connector and said hinging member is slidable receivable within the corresponding arm receiving recess.13. A hand truck according to claim 11, wherein the hinging member is spring biased into a retracted position with respect to a corresponding handle arm.14. A hand truck according to claim 10, wherein the coupling between the arm coupler and the hinging member comprises a floating joint, such that the center of rotation of the platform engaging assembly spontaneously changes during shifting the handle assembly between its respective positions.15. A hand truck according to claim 11, wherein each hinging member is provided with a first and a second pivot joint and the arm coupler of the arm connector comprises a first arresting location adapted for arresting the first pivot joint of the hinging member at either of the positions where the hinging member is retracted, and a second arresting location adapted for arresting the second pivot joint of the hinging member when the hinging member is extracted, and whereby the pivot joints of the hinging member spontaneously engage and disengage from the respective arresting locations of the arm connector upon shifting the handle assembly between its respective positions.16. A hand truck according to claim 15, wherein the first arresting location is an arced surface of the arm connector and the corresponding first pivot joint is a mating cylindrical portion of the hinging member pivotally bearing against said arced surface; and the second arresting location is a joint nesting recess below said arced surface, said nesting recess pivotally receiving a pivot projection constituting the second pivot joint of the hinging member.17. A hand truck according to claim 10, wherein at least one of the platform engaging assemblies of the handle assembly is fitted at its lower end with a bracket projecting from the first pivot joint and being pivotally engageable within a corresponding recess of the arm connector, so as to prevent unintended disengagement of the platform engaging assembly from the respective arm connector.18. A hand truck according to claim 15, wherein the arm coupler of the arm connector comprises a stopper portion to restrict rearward displacement of the first pivot joint, to prevent unintended withdrawal of the handle assembly from the platform.19. A hand truck according to claim 18, wherein the stopper portion is an arced surface of the arm connector, engageable with a mating cylindrical portion of the first pivot joint.20. A hand truck according to claim 1, wherein at the first position the arm extends at an angle of about 110° with respect to the top surface of the platform and at the second position the handle arms extends at an angle of about 120° with respect to the top surface of the platform.21. A hand truck according to claim 1, wherein the platform is provided with at least two hand grips, said grips being openings formed adjacent the side walls of the platform.22. A hand truck according to claim 21, wherein the openings communicate with the arm receiving recesses such that when the handle arms are received within the platform at the third position, they may be gripped through the respective opening.23. A hand truck according to claim 1, wherein the platform is provided with a several hooks for attaching thereto a tying strap.24. A hand truck according to claim 1, wherein the platform is formed with at least one tow hole formed adjacent a fore or rear end of the platform.25. A hand truck according to claim 1, wherein the platform is formed with two or more hooks for securing the load or items placed on the top surface of the platform by BUNGEE cord or tying cord.26. A hand truck comprising a platform fitted with casters and at either of the opposed side walls thereof with an arm connector, and a handle assembly comprising two parallel spaced handle arms, each fitted at its lower end with a platform engaging assembly; each platform engaging assembly being coupled with the respective handle arm with possibility for relative linear displacement therebetween; said handle assembly being displaceable between three respective positions: a first position in which the handle arms are substantially up-right and which position is a pull/push position, a second position in which the handle arms are inclined, said second position being useful as a push position, and a third position in which the handle arms are slidably displaceable along the side walls of the platform so as to be receivable within the platform.27. A hand truck according to claim 26, wherein the platform is formed with two parallel bores, each extending along and adjacent a corresponding side wall, from a rear end thereof, said bores are adapted for slidingly accommodating the arms of the handle assembly.28. A hand truck comprising a platform fitted with casters, and a handle assembly comprising two parallel spaced handle arms, each handle arm fitted at a lower end with a platform engaging assembly; said handle assembly being displaceable between a substantially up-right position and which position being a pull/push position, an inclined pulling position, and a dolly position in which the handle arms are slidably receivable within the platform, wherein the platform comprises an arm connector situated at a rear end of each platform side wall, each arm connector is formed with an arm coupler and an arced path formed with two pin arresting recesses for arresting a position pin of a respective handle arm, said recesses corresponding with the first and second positions of the handle assembly.29. A hand truck according to claim 28, wherein the platform is formed with two parallel bores, each extending along and adjacent a corresponding platform side wall, from a rear end thereof, for slidingly receiving the handle arms when the handle assembly is at the dolly position.30. A hand truck according to claim 28, wherein each arm connector further comprises an arm supporting portion such that when the handle assembly of the truck is pushed while the handle assembly is at its upright position, a corresponding portion of the handle arm bears against the arm supporting portion.31. A hand truck according to claim 28, wherein the arced path extends from a lower end of the arm connector opposite and in continuation with a corresponding arm receiving bore of the platform.32. A hand truck according to claim 28, wherein the arced path has an altering radius and wherein at least at a lower end thereof and at said two pin arresting recesses, the radius is substantially invariant.33. A hand truck according to claim 32, wherein the substantially invariant radius corresponds with a distance between the position pin of a respective handle arm and a center of rotation of the platform engaging assembly.34. A hand truck according to claim 28, wherein each platform engaging assembly comprises a hinging member and each handle arm is fitted with a laterally projecting pin slidable within the arced path and engageable with the pin arresting recesses at either of the respective first and second positions of the handle assembly.35. A hand truck according to claim 34, wherein the coupling between the arm coupler and the hinging member is a floating joint, such that the center of rotation of the hinging member spontaneously changes during shifting the handle assembly between its respective positions.36. A hand truck according to claim 34, wherein the hinging member is provided with a first and a second pivot joint and an arm coupler of the arm connector comprises a first arresting location adapted for arresting the first pivot joint at either of the positions where the hinging member is retracted, and a second arresting location adapted for arresting the second pivot joint when the hinging member is extracted, and whereby the pivot joints of the hinging member spontaneously engage and disengage from the respective arresting locations upon shifting the handle assembly between its respective positions.37. A hand truck according to claim 28, wherein the platform is formed with at least one tow hole formed adjacent a fore or rear end of the platform.38. A hand truck according to claim 28, wherein the platform is formed with two or more hooks for securing the load or items placed on the platform by BUNGEE cord or tying cord.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.