Tent – canopy – umbrella – or cane – Canes – sticks – crutches – and walking aids – Crutches
Patent
1987-04-03
1988-06-28
Hafer, Robert A.
Tent, canopy, umbrella, or cane
Canes, sticks, crutches, and walking aids
Crutches
403100, A61H 302
Patent
active
047532599
ABSTRACT:
A hinge element consists of a tube connector attached to the end of a tube, the end of the tube connector having a notched head portion. Pivotably attached to the notched head of the connector is a bracket element having a spherically shaped, notched end which engages the ends of a spring and a limiting wire. The limiting wire and spring are attached at their other ends to a cross bar and a second tube in which the hinge element and the first tube may slide coaxially. A hand grip is also disclosed which consists of a central grip portion with two cylindrical parallel holes having slits on the outside thereof. At the outer edges of the slits are ribs which, when the outer portions of the grip are tightened, focus the compressive forces generated by the tightening toward the tube portions, thereby creating a strong frictional hold. The hinge and grip configurations are found in a bitubular orthopedic crutch having three sections. Utilizing the properties of the hinge element, the three sections may be folded one over another to reduce the size of the bitubular crutch to approximately 1/3 of its operating length.
REFERENCES:
patent: Re28067 (1974-07-01), Hyman
patent: 469592 (1892-02-01), Parkes
patent: 972284 (1910-10-01), Storey
patent: 1400394 (1921-12-01), Warry
patent: 1446835 (1923-02-01), Cook
patent: 1534820 (1925-04-01), Walmsley
patent: 3635233 (1972-01-01), Robertson
patent: 3655297 (1972-04-01), Bolen, Jr. et al.
patent: 3730544 (1973-05-01), Hyman
patent: 3886962 (1975-06-01), Diamontis
patent: 4253478 (1981-03-01), Husa
patent: 4437480 (1984-03-01), Husa
patent: 4527579 (1985-07-01), Knotter et al.
Hansen Ries B.
Morter Howard G.
Cooper, III John C.
Hafer Robert A.
Sam Charles H.
Sylke C. Thomas
Wiviott Fred
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