Richard Levi Cartwright

US Patent:

6540310, Apr 1, 2003

Filed:

Apr 26, 2002

Appl. No.:

10/132995

Inventors:

Richard D. Cartwright - Beaverton OR

Assignee:

Ironwood Designs LLC - Tigard OR

International Classification:

B62D 5528

US Classification:

305180, 305160, 305162

Abstract:

A grouser structure for use on an outer surface of a continuous track belt to provide traction and shock absorption, the grouser structure including a grouser body that defines a grouser chamber and a spline element positioned within the grouser chamber. In one preferred embodiment a shock absorption gap is formed between the inner chamber peripheral surface and the outer spline peripheral surface. In another preferred embodiment the base of the grouser body is solid or contains other structure to prevent the first body side leg and the second body side leg from spreading. In yet another preferred embodiment the spline element is a solid reinforcement spline element. In still another preferred embodiment the spline element is associated with an extension section to which an ice cleat may be functionally attached.

US Patent:

D473244, Apr 15, 2003

Filed:

Feb 19, 2002

Appl. No.:

29/155976

Inventors:

Richard D. Cartwright - Beaverton OR

Assignee:

Ironwood Designs LLC - Tigard OR

International Classification:

1503

US Classification:

D15 28

US Patent:

D478025, Aug 5, 2003

Filed:

Feb 19, 2002

Appl. No.:

29/155956

Inventors:

Richard D. Cartwright - Beaverton OR

Assignee:

Ironwood Designs LLC - Tigard OR

International Classification:

1211

US Classification:

D12107

US Patent:

D478026, Aug 5, 2003

Filed:

Feb 19, 2002

Appl. No.:

29/155957

Inventors:

Richard D. Cartwright - Beaverton OR

Assignee:

Ironwood Designs LLC - Tigard OR

International Classification:

1211

US Classification:

D12114

US Patent:

53300190, Jul 19, 1994

Filed:

May 6, 1993

Appl. No.:

8/058471

Inventors:

Richard D. Cartwright - Beaverton OR

Assignee:

II-Tracker, Inc. - Aloha OR

International Classification:

B62D 5504

US Classification:

180 921

Abstract:

A towing vehicle having power-driven entered rear drive wheels. A towed attachment frame with lateral trailing wheels is coupled to the towing vehicle. A continuous belt on each side of the vehicle is trained over a drive wheel and a trailing wheel. A row of cleat structures is secured to the outer surface of a belt. A cleat structure includes a central expanse and elongate extension sections extending outwardly from opposite ends of a central section. Extension sections protrude beyond opposite lateral margins of a belt. A cleat structure includes an element plastic clear body, and spline elements secured by fasteners to a belt clamp against shoulders in a cleat body to hold it in place.

US Patent:

46501851, Mar 17, 1987

Filed:

Jan 26, 1984

Appl. No.:

6/574174

Inventors:

Richard D. Cartwright - Beaverton OR

International Classification:

A63B 2106

US Classification:

272117

Abstract:

An exercise machine having a beam pivoted off center, with a weight movable along the beam under control of a motor. A cable connects the beam to a handle or other device for assumption by the excerciser of the load created by the weight. The weight can be moved over center for counterbalancing purposes.