Daniel Z Zhou

US Patent:

7896394, Mar 1, 2011

Filed:

Aug 16, 2006

Appl. No.:

11/504968

Inventors:

Mark A. Jackson - Fresno CA, US
John J. Tarter - Fresno CA, US
Mark E. Greig - Longmont CO, US
Rex W. Stevens - Longmont CO, US
James M. Koerlin - Broomfield CO, US
Samuel D. Traxinger - Fresno CA, US
Daniel Z. Zhou - Clovis CA, US
Allen B. Killebrew - Longmont CA, US

Assignee:

Sunrise Medical HHG, Inc. - Longmont CO

International Classification:

B60S 9/00

US Classification:

280755, 180 651

Abstract:

A wheelchair includes a frame, and a front pivot arm pivotally mounted to the frame at a front pivot point, the front pivot arm having a caster for supporting the frame. A rear pivot arm is pivotally mounted to the frame at a rear pivot point, the rear pivot arm having a caster for supporting the frame. A ground engaging mid-wheel drive wheel is connected to the frame. A linkage connects the front and rear pivot arms to each other in a manner such that an upward or downward rotation of one of the pivot arms about its pivot point causes rotation of the other pivot arm about its pivot point in an opposite rotational direction.

US Patent:

8113531, Feb 14, 2012

Filed:

Dec 11, 2008

Appl. No.:

12/333102

Inventors:

Daniel Z. Zhou - Fresno CA, US
Mark A. Jackson - Fresno CA, US
John J. Tarter - Fresno CA, US
Mark E. Greig - Longmont CO, US
Rex W. Stevens - Longmont CO, US
James M. Koerlin - Broomfield CO, US
Samuel D. Traxinger - Fresno CA, US
Allen B. Killebrew - Longmont CO, US

Assignee:

Sunrise Medical HHG, Inc. - Longmont CO

International Classification:

B62D 61/12

US Classification:

2803041, 180 651, 180209, 180907, 2802501

Abstract:

A personal mobility vehicle includes an base unit having a frame and front and rear pivot arms pivotally mounted at respective front and rear pivot points. The front and rear pivot arms support casters. A drive unit having a ground engaging mid-wheel drive wheel is connected to the frame. A linkage connects the front and rear pivot arms to each other in a manner such that an upward or downward rotation of one of the pivot arms about its pivot point causes rotation of the other pivot arm about its pivot point in an opposite rotational direction. The base unit may also include a drive unit that is pivotally supported on the base unit by a torque arm and a suspension system that includes a suspension stop. The torque arm selectively disengages the suspension stop to allow movement of the front caster wheel in response to the terrain traversed.

US Patent:

8210556, Jul 3, 2012

Filed:

Feb 13, 2012

Appl. No.:

13/372278

Inventors:

Daniel Z. Zhou - Fresno CA, US
Mark A. Jackson - Fresno CA, US
John J. Tarter - Fresno CA, US
Mark E. Greig - Longmont CO, US
Rex W. Stevens - Longmont CO, US
James M. Koerlin - Broomfield CO, US
Samuel D. Traxinger - Fresno CA, US
Allen B. Killebrew - Longmont CO, US

Assignee:

Sunrise Medical HHG, Inc. - Longmont CO

International Classification:

B62D 61/12

US Classification:

2803041, 2083042, 108209

Abstract:

A wheelchair includes a frame, and a front pivot arm pivotally mounted to the frame at a front pivot point, the front pivot arm having a caster for supporting the frame. A rear pivot arm is pivotally mounted to the frame at a rear pivot point, the rear pivot arm having a caster for supporting the frame. A ground engaging mid-wheel drive wheel is connected to the frame. A linkage connects the front and rear pivot arms to each other in a manner such that an upward or downward rotation of one of the pivot arms about its pivot point causes rotation of the other pivot arm about its pivot point in an opposite rotational direction.

US Patent:

8469383, Jun 25, 2013

Filed:

Jul 3, 2012

Appl. No.:

13/541054

Inventors:

Daniel Z. Zhou - Fresno CA, US
Mark A. Jackson - Fresno CA, US
John J. Tarter - Fresno CA, US
Mark E. Greig - Longmont CO, US
Rex W. Stevens - Longmont CO, US
James M. Koerlin - Broomfield CO, US
Samuel D. Traxinger - Fresno CA, US
Allen B. Killebrew - Longmont CO, US

Assignee:

Sunrise Medical (US) LLC - Fresno CA

International Classification:

B62D 61/12

US Classification:

2803041, 2802501, 180209, 180907

Abstract:

A wheelchair includes a frame, and a front pivot arm pivotally mounted to the frame at a front pivot point, the front pivot arm having a caster for supporting the frame. A rear pivot arm is pivotally mounted to the frame at a rear pivot point, the rear pivot arm having a caster for supporting the frame. A ground engaging mid-wheel drive wheel is connected to the frame. A linkage connects the front and rear pivot arms to each other in a manner such that an upward or downward rotation of one of the pivot arms about its pivot point causes rotation of the other pivot arm about its pivot point in an opposite rotational direction.

US Patent:

7222881, May 29, 2007

Filed:

Apr 27, 2004

Appl. No.:

10/832951

Inventors:

Daniel Z. Zhou - Clovis CA, US

Assignee:

Sunrise Medical HHG Inc. - Longmont CO

International Classification:

B60R 21/13

US Classification:

280755

Abstract:

An adjustable anti-tip stop for a wheelchair is disclosed.