Pivot joint assembly for a folding wheelchair frame

Details Pivot joint assembly for a folding wheelchair frame Pivot joint assembly for a folding wheelchair frame

1987-05-18

1988-10-25

Love, John J.

Land vehicles

Wheeled

Occupant propelled type

280647, 297DIG4, 403191, B62K 1918

Patent

active

047798858

ABSTRACT:
An improved pivot joint assembly is provided for use in the frame of a folding wheelchair or the like, wherein the pivot assembly provides a simple yet sturdy pivot interconnection between tubular frame members. The pivot joint assembly comprises a bearing of plastic or the like anchored within an open end of a first tubular frame member and defining an outwardly presented concave bearing seat, preferably of semi-cylindrical shape, for engaging the exterior of a second tubular frame member at a selected position intermediate the length of the second frame member. A strap bracket of generally U-shaped configuration is wrapped about the second frame member and secured by a lock pin or the like to the first frame member and to the bearing to retain the frame members in generally T-shaped relation with the first frame member pivotal about a central axis of the second frame member. A retainer pin is fastened through an elongated slot in the strap bracket and into the second frame member to retain the strap bracket and first frame member in a longitudinally fixed position relative to the second frame member.

REFERENCES:
patent: 1380468 (1921-06-01), Drew
patent: 1786037 (1930-12-01), Sturgis
patent: 2253857 (1941-08-01), Hedstrom
patent: 2540910 (1951-02-01), Reger
patent: 2959212 (1960-11-01), Bauer
patent: 4179159 (1979-12-01), Sieklucki et al.
patent: 4436320 (1984-03-01), Brudermann et al.
patent: 4636104 (1987-01-01), Dihn
patent: 4648615 (1987-03-01), Volin

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