Jerome Edwin Schaeffer
Engineers at Northumbria Ln, Beaverton, OR
License number
Colorado 15058
Issued Date
Aug 18, 1977
Renew Date
Apr 1, 1999
Expiration Date
Apr 1, 1999
Type
Professional Engineer
Address
Address
14965 NW Northumbria Ln, Beaverton, OR 97006
Personal information
See more information about Jerome Edwin Schaeffer at radaris.comName
Address
Phone
14965 NW Northumbria Ln, Beaverton, OR 97006
14965 Northumbria Ln, Beaverton, OR 97006
Professional information
See more information about Jerome Edwin Schaeffer at trustoria.com
Wheelchair
Wheelchair
US Patent:
6715780, Apr 6, 2004
Filed:
Oct 15, 2001
Appl. No.:
09/977424
Inventors:
Jon Eric Schaeffer - Beaverton OR 97008
Jerome Edwin Schaeffer - Beaverton OR 97006
Jerome Edwin Schaeffer - Beaverton OR 97006
International Classification:
B62M 114
US Classification:
280248, 2802501
Abstract:
A manual wheelchair system comprising of a pair of lever arms positioned on each side of the chair that actuate a propulsion system located entirely under the seat of the wheelchair. Both the push and pull stroke of the levers, unlimited by stroke angle, provides unidirectional forward propulsion to the rear wheels of the chair. This is accomplished through drive gears fitted with one-way clutches and idler gears intermeshing with them. A sprocket is attached to one drive gear, and connects to an internal shifting hub using a chain or belt. This hub could optionally be a manual or automatic unit, with the automatic shifting unit relying on sensory feedback from the rear drive wheel to determine the most efficient ratio of operation. The hub connects to the rear drive axle through another sprocket and chain combination and drives the rear wheel as the levers are manipulated. The rear axle has a disconnecting clutch so that the entire drive propulsion system can disengaged from the chair.