Lightweight high load capacity folding utility cart with unique support structure and ergonomic handle

  • US 8,439,374 B1
  • Filed: 01/07/2011
  • Issued: 05/14/2013
  • Est. Priority Date: 05/14/2010
  • Status: Active Grant
First Claim
Patent Images

1. A cart comprising:

  • a. an integrally formed front wall having a front outer surface, a rear interior surface, a first longitudinal edge, a bottom edge, a top edge and a second longitudinal edge, an integrally formed first sidewall having an outer surface, an inner surface, a first longitudinal edge, a bottom edge, a top edge and a second longitudinal edge, the first sidewall having a central longitudinal crease enabling the first sidewall to be folded inwardly, an integrally formed rear wall having an outer rear surface, an interior surface, a first longitudinal edge, a bottom edge, a top edge and a second longitudinal edge, an integrally formed second sidewall having an outer surface, an inner surface, a first longitudinal edge, a bottom edge, a top edge and a second longitudinal edge, the second sidewall has a central longitudinal crease enabling the second sidewall to be folded inwardly. a bottom wall having an outer lower surface, an inner surface, a front edge, a first side edge, a rear edge and a second side edge, the cart is integrally formed so that the front wall is attached to the bottom wall and to the first sidewall and second sidewall along respective edges, the first sidewall is attached to the bottom wall and to the front wall and rear wall along respective edges, the rear wall is attached to the bottom wall and to the first sidewall and to the second sidewall along respective edges, the second sidewall is attached to the bottom wall to the rear wall and to the front wall along respective edges;

    b. a rotatable base member having a front edge affixed to the bottom edge of the front wall and front edge of the bottom wall, the rotatable base member having a hard interior which is surrounded by a lower surface and an upper surface, when in use, the base member is rotated so that its lower surface rests against the interior surface of the bottom wall to form a strong base and to keep the cart in an opened condition so that the sidewalls cannot fold inwardly, and when the base member is rotated so that its upper surface rests against the interior surface of the front wall, the cart can be folded;

    c. an interior compartment surround by interior surfaces of the front wall, first sidewall, rear wall, second sidewall, and upper surface of the rotatable base member;

    d. a first wheel assembly having a frame with a first transverse wall having an opening, a second transverse wall having an opening, and a space between the transverse walls receiving a wide wheel within the space and retained on an axle supported in the openings of the respective transverse walls, a front plate extending from the frame in front of the transverse walls and resting against the bottom surface of the bottom wall, the frame has a rear wall by which the frame is affixed to the rear wall of the cart by fastening means, the first wheel assembly is adjacent the intersection of the bottom wall the first sidewall and the rear wall;

    e. a mirror image second wheel assembly located adjacent the intersection of the bottom wall, the rear wall and the second sidewall, the second wheel assembly having a frame with a first transverse wall having an opening, a second transverse wall having an opening, and a space between the transverse walls receiving a wide wheel within the space and supported on an axle supported in the openings of the respective transverse walls, a front plate extending from the frame in front of transverse walls and resting against bottom surface of the bottom wall of the cart, the frame having a rear wall by which the frame is affixed to the rear wall of the cart by fastening means; and

    f. a front beam assembly comprising a beam member affixed on its upper side to the bottom surface of bottom wall and having a pair of spaced apart posts extending transversely to the beam member on the side of the beam member opposite to the side affixed to the bottom surface of the bottom wall of the cart, a given height of each post combined with the beam member being substantially the same as a given height of each wide wheel and its respective transverse walls so that when the cart rests on a level surface, a bottom of each wide wheel and a bottom of each post touch the level surface at the same level, providing a stabile structure, the combination of the wide wheels, the respective front plates which rest against the lower surface of the bottom wall of the cart also provide further support to the rotatable base member combined with the beam assembly and its posts to enable the cart to retain heavy objects within its interior compartment.

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