Hand truck with retracting load shifting lever
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0289284
(2002-11-07)
|
발명자
/ 주소 |
|
대리인 / 주소 |
Siemens Patent Services, LC
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
6 |
초록
▼
A hand truck having load shifting member which tilts the hand truck under conditions of greater leverage than that available by grasping the frame of the hand truck is disclosed. The load shifting member comprises a spring retracting lever rotatably attached to an axle journaled from the frame of th
A hand truck having load shifting member which tilts the hand truck under conditions of greater leverage than that available by grasping the frame of the hand truck is disclosed. The load shifting member comprises a spring retracting lever rotatably attached to an axle journaled from the frame of the hand truck such that when in a retracted position, the lever is substantially parallel to the frame. Pulling on the upper end of the lever rotates the lever such that the lower end of the lever engages the lower portion of the hand truck frame, shifting the center of gravity of the loaded hand truck such that it may be more easily tilted to a position for moving the hand truck. A spring returns the lever to a retracted position when not in use.
대표청구항
▼
1. A hand truck comprising:an upright load bearing frame of fixed geometry having a front side, a load plate rigidly fixed to said load bearing frame at said front side, a rear side, and two carriage wheels rotatably mounted to said load bearing frame at said rear side at a fixed point on said load
1. A hand truck comprising:an upright load bearing frame of fixed geometry having a front side, a load plate rigidly fixed to said load bearing frame at said front side, a rear side, and two carriage wheels rotatably mounted to said load bearing frame at said rear side at a fixed point on said load bearing frame, said carriage wheels having an axis of rotation about an axle therebetween, a load shifting lever, said load shifting lever disposed to move the center of gravity of said load bearing frame, said load shifting lever comprising a retracting lever member rotatably mounted to said axle at a fixed point spaced apart from said carriage wheels, and a load shifting assembly stop positioned on a rear portion of said load plate, said stop adapted to limit the degree of rotation of said load shifting lever about said axle; a lower end of said retracting lever member positioned to directly contact said stop when an upper end of said load shifting lever is pulled from a retracted position by a user, thereby causing said load plate and the load bearing frame to tilt and moving the center of gravity of said load bearing frame. 2. The hand truck according to claim 1, wherein said axle is disposed in journaled supported relation to said load bearing frame.3. The hand truck according to claim 2, wherein said retracting lever member is substantially parallel to said load bearing frame in a first, retracted position and substantially oblique to said load bearing frame when in a second, actuated position.4. The hand truck according to claim 3, further comprising a return spring having a proximal end anchored at said load bearing frame and a distal end anchored at said retracting lever member, wherein said return spring is disposed to urge said retracting lever member into said first, retracted position.5. The hand truck according to claim 1, wherein said lever stop assembly comprises a threaded rod, said threaded rod engaging a threaded aperture at a lower end of said load bearing frame at a first end and having a lever engaging head at a second end, said stop disposed to limit movement of said retracting lever member to prevent excessive inclination of said frame of said hand truck.6. The hand truck according to claim 5, further comprising a load plate extension, said load plate extension hingedly attached at a juncture between said load bearing frame and said load plate such that an increased load bearing surface is formed.7. A hand truck comprising:an upright load bearing frame of fixed geometry having a front side; a load plate rigidly fixed to said load bearing frame at a lower extreme of said front side; a load plate extension hingedly attached at a juncture of said load plate and said load bearing frame such that an increased load bearing surface is formed; a rear side, and two carriage wheels rotatably mounted to said load bearing frame at said rear side at a fixed point on said load bearing frame, said carriage wheels having an axis of rotation about an axle therebetween, said axle being disposed in journaled supporting relationship to said load bearing frame; a load shifting lever, said load shifting lever disposed to move the center of gravity of said load bearing frame, said load shifting lever comprising a retracting lever member rotatably mounted to said axle at a fixed point spaced apart from said carriage wheels, said retracting lever being substantially parallel to said load bearing frame in a first, retracted position and substantially oblique to said load bearing frame when in a second, actuated position; and a return spring having a proximal end anchored at said load bearing frame and a distal end anchored at said retracting lever member, wherein said return spring is disposed to urge said retracting lever member into said first retracted position; a lever stop assembly positioned on a rear portion of said load plate, said lever stop assembly comprising a threaded rod, said threaded rod engaging a threaded aperture at a lower end of said load bearing frame at a first end and having a lever engaging head at a second end, said stop assembly adapted to limit the degree of rotation of said load shifting lever about said axle to prevent excessive inclination of said frame of said hand truck; a lower end of said load shifting lever positioned to directly contact said stop assembly when an upper end of said load shifting lever is pulled from a retracted position by a user, thereby causing said load plate and the load bearing frame to tilt and moving the center of gravity of said load bearing frame.
이 특허에 인용된 특허 (6)
-
Schoberg Carl J. (Zumbro Falls MN), Convertible hand truck.
-
Storay Craig F. (Bellamy Hills Forthside ; Tasmania 7310 AUX) Baldini John A. (Buster Road Melrose ; Tasmania 7310 AUX), Hand Trolley.
-
Koenig Larry D., Hand truck having ground engaging lever for tilting.
-
Maupin David J. (P.O. Box 124 Muldrow OK 74948), Hand truck with safety device.
-
Olson Harlan F. (4885 S. Jason Englewood CO 80110), Load-unloading shoe for wheeled handtrucks.
-
Mortenson Carl N. (Midland MI), Repositionable hand truck.
이 특허를 인용한 특허 (6)
-
Hlavac, Thomas Aaron, Cart for a water jetting machine.
-
Josephsen, Greg, Convertible cart device.
-
Whinnery, Norman A., Dual directional hand truck.
-
Ullrich, Osmar A.; Sauer, Steven A., Patient lifter.
-
Kossowsky, Andy, System and method for transporting objects.
-
Kossowsky, Andy, System and method for transporting objects.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.