Tent – canopy – umbrella – or cane – Canes – sticks – crutches – and walking aids – Crutches
Patent
1994-08-19
1995-04-04
Mai, Lanna
Tent, canopy, umbrella, or cane
Canes, sticks, crutches, and walking aids
Crutches
135 69, 135 72, 135 75, A61H 302
Patent
active
054028116
ABSTRACT:
A telescopic and foldable crutch structure includes an armpit seat, two telescopic inner tubes each having a top end on which the armpit seat is disposed, two telescopic outer tubes telescopically receiving the inner tubes, a handle adjustably coupling the telescopic inner and outer tubes with each other, a locking cam having a locking pin, two coupling blocks, two outer coupling tubes, an adjusting outer tube, an adjusting inner tube, a cap member fitted on bottom ends of the outer coupling tubes and the adjusting outer tube and a pad member fitted on a bottom end of the adjusting inner. The adjusting outer tube is tightened by the locking cam, The adjusting outer tube, is pivotally connected with the telescopic outer tubes by the locking pin and tightened between the telescopic outer tubes by the locking cam. The locking cam is adapted to be pulled upward, permitting the adjusting outer tube and the outer coupling tubes to be folded upward. The outer coupling tubes are coupled with the coupling blocks which are engaged with the bottom ends of the telescopic outer tubes via two latch springs. The handle is adapted to be rotated for uncoupling the telescopic inner tubes from the telescopic outer tubes for telescopically adjusting the length of the crutch.
REFERENCES:
patent: 1349639 (1920-08-01), Taylor et al.
patent: 4476885 (1984-10-01), Stein
patent: 4637414 (1987-01-01), Urban
patent: 4763680 (1988-08-01), Acosta, Sr.
patent: 4838291 (1989-06-01), DiVito
patent: 5197502 (1993-03-01), Wang
patent: 5299589 (1994-04-01), Zatulovsky
patent: 5351701 (1994-10-01), Hsiao
Keep-Young Industry Co., Ltd.
Mai Lanna
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