Mechanically interlocked wheel

• US 9,162,527 B1
• Filed: 07/14/2014
• Issued: 10/20/2015
• Est. Priority Date: 07/14/2014
• Status: Expired due to Fees

• Current Assignee: White Oak Industries, Inc.
• Original Assignee: White Oak Industries, Inc.
• Inventors: Harrelson, Anthony T.
• Primary Examiner(s): Kotter, Kip T
• Application Number:
  US14/330,089
• Time in Patent Office: 463 Days
• Field of Search: 301/5.301, 301/5.304, 301/5.306, 301/5.307, 301/5.308, 16/45
• US Class Current: 1/1
• CPC Class Codes: B29L 2031/32 Wheels, pinions, pulleys, castors or rollers , Rims inner tubes B29L2023/245; gears B29L2015/003; tyres B29L2030/00
• CPC Class Codes: B60B 2310/321 by overmolding
• CPC Class Codes: B60B 2900/112 Costs
• CPC Class Codes: B60B 2900/131 Vibrations
• CPC Class Codes: B60B 2900/133 Noise
• CPC Class Codes: B60B 3/001 Lightweight wheels, e.g. for strollers or toys
• CPC Class Codes: B60B 33/0028 Construction of wheels; methods of assembling on axle
• CPC Class Codes: B60B 5/02 made of synthetic material

Abstract

A mechanically interlocked wheel assembly including a rigid core formed from aluminum integrally bound to an elastomeric infill by passing the infill material through a plurality of slots defined in the core rim during the molding process is provided. A ground-engaging tread is attached to the infill to form a structurally superior wheel assembly capable of carrying heavy loads in extreme environments for an extended period of time without the need to replace the wheel components. A method of manufacturing a mechanically interlocked wheel assembly is also included herein.

Claims

1. A wheel assembly comprising a core formed from an inner flange and an outer flange attached to opposing ends of a floor and a core rim defining a continuous exterior surface, the core defining a plurality of slots positioned circumferentially about the core rim a tread circumferentially oriented around the core, and an infill encasing the core rim and defining a disk shape with an infill rim defining a continuous exterior surface located a uniform radial distance from an axis of the wheel and positioned between and integrally affixed to the core and the tread, the infill defining a plurality of ribs each extending continuously and transversely across the exterior surface of the infill rim and defining a rib length less than a width of the infill rim, whereby the core defines a hardness greater than the tread.

2. The wheel assembly of claim 1 wherein the core defines a plurality of ribs each extending transversely across the smooth exterior surface of the core rim.

3. The wheel assembly of claim 1 wherein the core has a hardness greater than ninety (90) Shore A on the durometer scale.

4. The wheel assembly of claim 1 wherein the tread has a hardness greater than eighty-five (85) Shore A on the durometer scale.

5. The wheel assembly of claim 1 wherein the infill has a hardness value of less than seventy-five (75) Shore A on the durometer scale.

6. The wheel assembly of claim 1 wherein the core is formed from aluminum.

7. The wheel assembly of claim 1 wherein the infill is formed from polyurethane.

8. The wheel assembly of claim 1 wherein the tread is formed from polyurethane.

9. A wheel assembly comprising:

an aluminum core defining a hardness rating of greater than ninety-five (95) Shore A on the durometer scale and a plurality of slots each defined by a pair of radially extending walls joined by an arcuate linking exterior wall extending parallel to an outer surface of a cylindrical outer flange, each slot positioned circumferentially about a core rim defining a continuous exterior surface, the core including an inner flange attached by a floor to the outer flange forming a U-shape and sized to encircle a cylindrical central aperture defined by the core and receive a bearing, the core rim adjoined to the outer flange and defining a plurality of ribs each extending transversely across the exterior surface of the core rim and defining a vertical height extending radially from a core rim exterior surface, the core rim defining a longitudinally facing cylindrical portion that extends a distance less than a distance that a longitudinally facing cylindrical portion of the outer flange extends to define a shoulder on the outer flange for seating an infill;

a polyurethane tread defining a hardness rating of greater than eighty-five (85) Shore A on the durometer scale but less than the hardness rating of the core, the tread circumferentially oriented around the core and making up about fifteen percent (15%) of the wheel assembly radius; and

the infill formed from polyurethane and defining a hardness rating of less than seventy-five (75) Shore A on the durometer scale formed in the shape of an infill disk defining a rim, an entirety of an exterior radial surface of the rim located the same radial distance from an axis of the wheel and positioned between and mechanically interlocked to the core and the tread.

10. The wheel assembly of claim 9 whereby the plurality of slots pass entirely laterally from one side of the rim to the other.

11. A wheel assembly comprising a core formed from:

an inner flange that defines a longitudinally facing cylindrical portion;

an outer flange extending circumferentially about the inner flange and defining a longitudinally facing cylindrical portion, whereby the longitudinally facing cylindrical portion of the outer flange extends in a longitudinal direction;

a floor interconnecting the inner flange and the outer flange;

a core rim extending circumferentially around and parallel to the outer flange and defining a longitudinally facing cylindrical portion that extends a distance less than a distance that the longitudinally facing cylindrical portion of the outer flange extends to define a shoulder on the outer flange for seating an infill;

whereby the core rim defines an inner facing surface that engages with the outer flange, and further defines a plurality of slots that extend circumferentially and longitudinally, each slot defining a top surface, a bottom surface, and a pair of side surfaces interconnecting the top surface and the bottom surface, whereby the bottom surface of each of the slots is entirely formed by an intersection with the outer flange such that the pair of side surfaces terminate into the outer flange;

whereby the core rim is defined by a pair of opposingly oriented continuous lateral sides joined by a transversely extending continuous outer face;

whereby the outer flange is defined by a transversely extending continuous outer face;

whereby the infill extends radially of the core rim and into the slots and the longitudinally facing cylindrical portion of the outer flange, the infill forming a circumferentially extending surface to which a tread is applied, a first portion of the infill facing the outer face of the core rim such that the first portion of the infill defines a corresponding continuous surface, and a second portion of the infill facing the outer surface of the outer flange such that the second portion of the infill defines a correspondingly continuous and collinear surface.

12. The wheel assembly of claim 11 whereby the core defines a plurality of ribs each extending transversely across the exterior surface of the core rim.