Patent ID: 6264230
Filing Date: 2001-07-24
Classification: B62B

Abstract:
A foldable hand cart comprising;A. a foldable frameI. the foldable frame having a first frame member and a second frame member,a. the first frame member having a first arched side,a first cross member,a second arched side,and a second cross member,b. the second frame member being pivotably and rotatably connected to the first frame member,c. the second frame member having second frame member receiving means,II. the foldable frame having a first payload carrier,a. the first payload carrier having rotatable attachment means,i. the rotatable attachment means being rotatably attached to the first frame member,b. the first payload carrier having a second frame member engagement means,i. the second frame member engagement means being removably inserted into the second frame member receiving means,III. a second payload carrier,a. the second payload carrier having pivotable attachment means,i. the pivotable attachment means being pivotably attached to the first frame member,IV. frame stabilizing means,a. the frame stabilizing means connecting the first frame member to the second frame member,B. a first wheel riser,I. the first wheel riser being attached to and depending downwardly from the first frame member second cross member,II. the first wheel riser having first wheel mounting block attachment means,C. a second wheel riser,I. the second wheel riser being attached to and depending downwardly from the first frame member second cross member,II. the second wheel riser having second wheel mounting block attachment means,D. a first wheel mounting block,I. the first wheel mounting block having a first hollow tubular passage,a. the first hollow tubular passage having an axis, and diameter,II. the first wheel mounting block having a second hollow tubular passage,a. the second hollow tubular passage having an axis and diameter,III. the first wheel mounting block having a first hole,a. the first hole having a first bore extending into the first wheel mounting block,i. the first bore having a floor, diameter, a roughened surface texture, and depth,b. the first hole having diameter,i. the diameter being equal to the first hole first bore diameter,c. the first hole having an axis,i. the axis being perpendicular to the first wheel mounting block second hollow tubular passage axis,IV. the first wheel mounting block having a first ejectment means,a. the first ejectment means having first surface hole,b. the first ejectment means having a hollow tubular passage,i. the hollow tubular passage passing through the first wheel mounting block, coaxially with the first ejectment means first surface hole,c. the first ejectment means having a first bore hole,i. the first bore hole passing through and opening into the first boreii. the first bore hole being coaxial with the third hollow tubular passage and the first surface hole,E. a second wheel mounting block,I. the second wheel mounting block having a first hollow tubular passage,a. the first hollow tubular passage having an axis, and diameter,II. the second wheel mounting block having a second hollow tubular passage,a. the second hollow tubular passage having an axis, and diameter,III. the second wheel mounting block having a first hole,a. the first hole having a first bore extending into the first wheel mounting block,i. the first bore having a floor, diameter, a roughened surface texture, and depth,b. the first hole having diameter,i. the diameter being equal to the first hole first bore diameter,c. the first hole having an axis,i. the axis being perpendicular to the second wheel mounting block second hollow tubular passage axis,IV. the second wheel mounting block having a first ejectment means,a. the first ejectment means having a first surface hole,b. the first ejectment means having a hollow tubular passage,i. the hollow tubular passage passing through the second wheel mounting block, coaxially with the second wheel mounting block first ejectment means first surface hole,c. first ejectment means having a first bore hole,i. the first bore hole passing through and opening into the first bore,ii. the first bore hole being coaxial with the third hollow tubular passage and the first surface hole,F. a first attachment means,I. the first attachment means passing through the first wheel mounting block first hollow tubular passage and engaging the first wheel riser first wheel mounting block attachment means,G. a second attachment means,I. the second attachment means passing through the first wheel block second hollow tubular passage and engaging the first wheel riser first wheel mounting block attachment means,H. a third attachment means,I. the third attachment means passing through the second wheel block first hollow tubular passage and engaging the second wheel riser second wheel mounting block attachment means,I. a fourth attachment means,I. the fourth attachment means passing through the second wheel block second hollow tubular passage and engaging the second wheel riser second wheel mounting block attachment means,J. friction reduction means,I. the friction reduction means being press fit within the first wheel mounting block first bore and the second wheel mounting block first bore,K. a roller assembly,I. the roller assembly having a first end cap,a. the first end cap having outer diameter and radius,i. the radius being equal to one half of the outer diameter,b. the first end cap having a stub axle,i. the stub axle having outer diameter and depth,ii. the stub axle being co-axial with the first end cap,iii. the stub axle being inserted within the friction reduction means located in the first wheel mounting block,c. the first end cap outer diameter being greater than the first end cap stub axle outer diameter,II. the roller assembly having a second end capa. the second end cap having outer diameter,i. the outer diameter being equal to the first end cap outer diameter,b. the second end cap having radius,i. the radius being equal to one half of the second end cap outer diameter,c. the second end cap having a stub axle,i. the stub axle having outer diameter,aa. the outer diameter being equal to the first end cap stub axle outer diameter,ii. the stub axle having depth,aa. the depth being equal to the first end cap stub axle depth,iii. the stub axle being co-axial with the second end cap,iv. the stub axle being inserted within the friction reduction means located in the second wheel mounting block,d. the second end cap outer diameter being greater than the second end cap stub axle outer diameter,III. the roller assembly having a cylindrical roller section,a. the cylindrical roller section having a first end and a second end,i. the first end being attached to the first end cap,ii. the second end being attached to the second end cap,b. the cylindrical roller section having outer diameter of less than the first end cap outer diameter,c. the cylindrical roller section having a longitudinal axis,i. the longitudinal axis having a mid-point along it,aa. the mid-point being equidistant from the first end cap and the second end cap,d. the cylindrical roller section being coaxial with the first end cap and the second end cap,e. the cylindrical roller section having a continuous exterior surface,IV. the roller assembly having a plurality of wave form vanes,a. the wave form vanes being attached to the cylindrical roller section,b. the wave form vanes extending from proximate to the cylindrical roller section first end, though not in contact with the first end cap, to proximate to the cylindrical roller section second end, though not in contact with the second end cap,c. the wave form vanes being positioned on the exterior surface, radially about the longitudinal axis,d. the wave form vanes each having a midsection, a second section and a third section,i. the mid-section being at an acute angle relative to the cylindrical roller assembly longitudinal axis,aa. the mid-section having a forward face and a rearward face, the forward face and the rearward face being parallel to one another,ii. the second section being at an obtuse angle relative to the mid-section,aa. the second section having a forward face and a rearward face, the forward face and the rearward face being parallel to one another,iii. the third section being at an obtuse angle relative to the mid-section and at an opposite angle relative to the second section,aa. the third section having a forward face and a rearward face, the forward face and the rearward face being parallel to one another,e. the wave form vanes each having height,i. wave form vane height and cylindrical roller section radius together being less than the second end cap radius.