Tent – canopy – umbrella – or cane – Canes – sticks – crutches – and walking aids – Crutches
Patent
1980-10-16
1982-12-21
Pinkham, Richard C.
Tent, canopy, umbrella, or cane
Canes, sticks, crutches, and walking aids
Crutches
135 81, A61H 302
Patent
active
043644058
ABSTRACT:
A crutch containing a retractable metal point wherein an elongated lower central member, adjustably secured between longitudinal support members of the crutch, houses a first retractable elongated metal rod pointed at one end and connected at its other end to a second retractable rod of reduced diameter which passes through a hollow hub disposed at the top of the central member. The hub is provided with a slot through which a pin is connected to said second rod and radially projects outwardly. A spring circumscribes the second rod and applies a spring loading to the first rod when in projected position. A resilient end cap fits over the end of the elongated member and contains an axial bore and an aperatured metal plate through which the metal point projects when in projected position. To retract the metal point the connected metal rods are pulled up on a knurled rod attached to the top of the second rod until the rod is out of the slot and then the knob twisted to rotate the pin and lock it in a seat on top of the hub.
REFERENCES:
patent: 332808 (1885-12-01), Ladomus
patent: 1003103 (1911-09-01), Harding
patent: 1090960 (1914-03-01), Appelman
patent: 1164608 (1915-12-01), Care
patent: 1284991 (1918-11-01), Beegroft
patent: 1349639 (1920-08-01), Taylor et al.
patent: 2358853 (1944-09-01), Dunnicliff
patent: 2371246 (1945-03-01), McGrory et al.
patent: 3448749 (1969-06-01), Stark
patent: 3901258 (1975-08-01), Montgomery
Harper Robert S.
Norwood Robert F.
Kramer Arnold W.
Pinkham Richard C.
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