US3853372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheelchair
Assignee: Individual
•
Filing: 1973-02-23
•
Granted: 1974-12-10
•
Expires: 1993-02-23
Abstract
Abstract A wheelchair including a chassis and side parts said chassis supporting a seat and a seat back, arms being provided on both side parts of the seat, each of the two arms forming with a side part an arm and side unit vertically adjustable in guides on the chassis and lowerable at least into a position wherein the arm supporting surface of the arm is located in a plane with the seat, the unit being lockable at the desired adjusted height, and wherein each arm and side unit is formed by an inverted U-shaped supporting stirrup, an arm secured to the cross-piece of said stirrup and a side wall secured to said supporting stirrup and extending parallel to and externally of the plane of the supporting stirrup, said arm and side unit being vertically displaceable by guides provided in first vertical guide sleeves of said chassis and is releasably securable or adjustable between limits by a locking device.
Inventors
- 👤 Wilhelm Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:31
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/10; A61G5/12; A61G5/1054; A61G5/125; A61G5/128; Y; Y10; Y10S; Y10S297/00; Y10S297/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
246 words
A mobile invalid chair, containing: a foldable chassis formed by two side frames held at an adjustable distance from each other by a universal joint, said chassis carrying a seating surface and a back; an arm support provided in both side frames, each arm support having a side wall and arranged to be vertically displaceable as a unit, the arm support unit being lowerable with its upper resting surface to such an extent that it is in one plane with the seating surface, each arm support unit having vertical guide bars adapted to be lowered within vertical guide sleeves of said chassis, said guide sleeves being disposed with a clearance below said seat surface and secured to said chassis, said arm suPpot unit comprising a U-shaped supporting stirrup with its shanks pointing downwardly, said stirrup supporting said arm support on the cross-piece of said stirrup, said side wall being secured to the outside of said supporting stirrup by securing means on the U-shanks, said arm support being formed by a ledge which is rectangular in plan and is provided in the front part of the chair with an outwardly extended enlargement projecting into the region exterior of said chassis; and spring-loaded locking pins mounted on said guide sleeves and engaging in recess of said guide bars, said pins being displaceable transversely to the direction of displacement of the guide bars and are pivotably connected by connecting levers to actuating levers mounted to pivot on the chassis.
Claim 2
Dependent Claim
246 words
A mobile invalid chair, containing: a foldable chassis formed by two side frames held at an adjustable distance from each other by a universal joint, said chassis carrying a seating surface and a back; an arm support provided in both side frames, each arm support having a side wall and arranged to be vertically displaceable as a unit, the arm support unit being lowerable with its upper resting surface to such an extent that it is in one plane with the seating surface, each arm support unit having vertical guide bars adapted to be lowered within vertical guide sleeves of said chassis, said guide sleeves being disposed with a clearance below said seat surface and secured to said chassis, said arm suPpot unit comprising a U-shaped supporting stirrup with its shanks pointing downwardly, said stirrup supporting said arm support on the cross-piece of said stirrup, said side wall being secured to the outside of said supporting stirrup by securing means on the U-shanks, said arm support being formed by a ledge which is rectangular in plan and is provided in the front part of the chair with an outwardly extended enlargement projecting into the region exterior of said chassis; and spring-loaded locking pins mounted on said guide sleeves and engaging in recess of said guide bars, said pins being displaceable transversely to the direction of displacement of the guide bars and are pivotably connected by connecting levers to actuating levers mounted to pivot on the chassis.
Claim 3
Dependent Claim
37 words
A wheelchair as recited in claim 1, wherein said U-shanks of said supporting stirrup are bent outwardly at spaced intervals from the plane of vertical adjustment and on their outer sides have said side wall secured thereto.
Claim 4
Dependent Claim
22 words
A wheelchair as recited in claim 1, wherein said side wall is secured by fixing means to the outside of said U-shanks.
Claim 5
Dependent Claim
52 words
A wheelchair as recited in claim 1, wherein said cross piece of said supporting stirrup is provided with two said vertical guide members extending adjacent each other with a spaced interval therebetween, said guide members being displaceably mounted in said vertical guide sleeves secured to a horizontal supporting member of said chassis.
Claim 6
Dependent Claim
72 words
A wheelchair as recited in claim 3, wherein said vertical U-shanks of said supporting stirrup form guide members which displaceably engage in vertical guide sleeves secured to vertical members of said chassis, and wherein said guide sleeves are each provided on the outside with a slot extending in the longitudinal direction of said sleeve and receiving said fixing means of the side wall during the displacement of said arm and side unit.
Claim 7
Dependent Claim
115 words
A wheelchair as recited in claim 1, wherein said locking device associated with each arm and side unit is provided below the seat and has a double-armed lever mounted to pivot about a horizontal axis extending transversely to the direction of vertical displacement, said lever being connected to an actuating lever for effecting its pivotal movement and having at both its ends locking rods pivotably mounted thereon, one end of each rod being connected to said lever, said rods being displaceable in opposite directions during swivelling of said lever and engaging by its free end as a locking pin in locking openings provided at spaced intervals in a vertical direction in said vertical guide members.
Claim 8
Dependent Claim
56 words
A wheelchair as recited in claim 6, wherein the free end of each locking rod is displaceable in a second guide sleeve secured to the first guide sleeve and extending at right angles to said first sleeve and, by means of a spring member, is adapted to be brought to and held in the locking position.
Claim 9
Dependent Claim
25 words
A wheelchair as recited in claim 6, wherein said actuating lever is directly connected to the double-armed lever, and is disposed halfway down the chassis.
Claim 10
Dependent Claim
35 words
A wheelchair as recited in claim 6, wherein said actuating lever is journalled to pivot about an axis on the front of the chassis and is connected by an actuating rod to the double-armed lever.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |