Land vehicles – Wheeled – Occupant propelled type
Patent
1993-08-24
1996-05-07
Boehler, Anne Marie
Land vehicles
Wheeled
Occupant propelled type
2803041, 297330, 297339, 297DIG10, B60N 210
Patent
active
055138675
ABSTRACT:
A wheelchair includes a seat that pivots forward to assist the user in exiting and entering the chair. The seat is biased toward its forward or up-right position by mechanical springs having force adjustments for user adjustment of the seat-lift force. One embodiment includes a cam mechanism for varying this seat-lift force as the seat is being raised. A closed-loop hydraulic cylinder and piston actuator system is provided to (1) damp the spring action as the seat is raised and lowered, (2) control the rate of seat ascent and descent, and (3) permit the user to stop and lock the seat in any position between the horizontal and up-right positions. This closed-loop hydraulic system includes a manual control valve for user-control of the seat raising and lowering, and a user-adjustable flow rate control valve for limiting seat ascent and descent speeds.
REFERENCES:
patent: 974769 (1910-11-01), Hoff
patent: 2091088 (1937-08-01), Whedon et al.
patent: 2268914 (1942-01-01), Vandervoort
patent: 2442303 (1948-05-01), Mayfield
patent: 3023048 (1962-02-01), Barton
patent: 3954195 (1976-05-01), Deuchar
patent: 4519649 (1985-05-01), Tanaka et al.
patent: 4538853 (1985-09-01), Levenberg
patent: 4569556 (1986-02-01), Pillot
patent: 4573736 (1986-03-01), Levenberg
patent: 4623194 (1986-11-01), Pillot
patent: 4632455 (1986-12-01), Schiller et al.
patent: 4743065 (1988-05-01), Meiller et al.
patent: 4838612 (1989-06-01), Cross
patent: 4907303 (1990-03-01), Baird
patent: 4929022 (1990-05-01), Geraci
patent: 4979726 (1990-12-01), Geraci
patent: 5011224 (1991-04-01), Paul
patent: 5027446 (1991-07-01), Robertson
patent: 5054852 (1991-10-01), Tholkes
patent: 5096008 (1992-03-01), Mankowski
patent: 5108202 (1992-04-01), Smith
patent: 5115723 (1992-05-01), Wang
patent: 5195803 (1993-03-01), Quintile
patent: 5224750 (1993-07-01), Clark et al.
patent: 5333931 (1994-08-01), Weodendorf
Promotional brochure, The Booster, Levenberg, U.S. Patents.
Design News, Jan. 4, 1993, pp. 89, 90, "Wheelchair Can Raise and Lower Users," Charles J. Murray.
Homecare, Jun. 1990, pp. 17, 18, 48 , Jun. 1990.
Bloswick Donald S.
King Eric M.
Shirley Ben D.
Boehler Anne Marie
University of Utah
LandOfFree
Seat-lift wheelchair does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Seat-lift wheelchair, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Seat-lift wheelchair will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1222180