Tent – canopy – umbrella – or cane – Canes – sticks – crutches – and walking aids – Crutches
Patent
1978-12-28
1980-12-09
Bell, J. Karl
Tent, canopy, umbrella, or cane
Canes, sticks, crutches, and walking aids
Crutches
A61H 302
Patent
active
042379164
ABSTRACT:
A crutch has a piston 3 and cylinder 2 arrangement connected through a manually controlled valve (30, 54) and two one way ball valves 22,24 to a reservoir 12. A working fluid partly liquid and partly gas is compressed in the reservoir 12 and by manipulating the valve 30, 54 the user shortens the crutch by applying force between the handle 15 and the tip 5 and further manipulation of the valve 30,54 permits the liquid to resist shortening of the crutch.
REFERENCES:
patent: 3157188 (1964-11-01), Farnham
patent: 3416546 (1968-12-01), Carpenter
patent: 3486515 (1969-12-01), Chrysostomides
Harrison-Smith John L.
Milsom Henry B. C.
Bell J. Karl
Fisher & Paykel Limited
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