Toan Quoc Pham

US Patent:

20080088110, Apr 17, 2008

Filed:

Oct 13, 2006

Appl. No.:

11/581197

Inventors:

Toan D. Pham - Cedar Park TX, US
Rucker Ashmore - Horseshoe Bay TX, US
Lisa Rotelli - Lakeway TX, US

International Classification:

B62M 1/14

US Classification:

2802501

Abstract:

An input device, such as a joystick, provides proportional input signals related to a position of an actuating member along an actuation surface and also includes a switch that provides an additional signal when the actuating member is moved in a direction perpendicular to the actuation surface.

US Patent:

20110199179, Aug 18, 2011

Filed:

Apr 25, 2011

Appl. No.:

13/093457

Inventors:

Toan D. Pham - Cedar Park TX, US
Rucker Ashmore - Horseshoe Bay TX, US
Lisa Rotelli - Lakeway TX, US

Assignee:

INVACARE CORPORATION - Elyria OH

International Classification:

G09B 21/00

US Classification:

340 41

Abstract:

An input device, such as a joystick, provides proportional input signals related to a position of an actuating member along an actuation surface and also includes a switch that provides an additional signal when the actuating member is moved in a direction perpendicular to the actuation surface.

US Patent:

20130090779, Apr 11, 2013

Filed:

Oct 7, 2011

Appl. No.:

13/269395

Inventors:

Toan D. Pham - Cedar Park TX, US
Lisa M. Rotelli - Lakeway TX, US

Assignee:

INVACARE CORPORATION - Elyria OH

International Classification:

G05D 1/00

US Classification:

701 1

Abstract:

A system and method for driving a power driven wheelchair is provided. One system embodiment may include, for example, a plurality of force sensing resistors, at least one force sensing resistor comprising a contactable surface for sensing a pressure thereon, wherein the at least one force sensing resistor generates a proportional signal in response to the sensed pressure. A controller comprising at least one input for receiving the proportional signal and having logic to receive the proportional signal and generate a control signal which is outputted to a motor controller to control the power driven wheelchair.