1976-12-04
1978-06-13
Frinks, Ronald L.
3 126, 3 127, A61F 106, A61F 100
Patent
active
040940160
ABSTRACT:
An artificial hand and forearm comprises an elongated housing open at its rear end adapted to receive the stub of a human forearm and adjacent upper arm, adapted for securing thereto. A plate within the housing pivotally mounts a series of finger assemblies within the housing, with said finger assemblies projecting from the housing. A thumb assembly is spaced from said finger assemblies and pivotally mounted upon said plate, with the thumb assembly projecting from the housing and opposed to the forefinger assembly. A cam shaft is journalled upon said plate and mounts a series of spaced cams respectively registering with the inner ends of the finger assemblies. One cam includes a pair of opposed cam surfaces for simultaneous registry with the forefinger and thumb assemblies. A spring biases said finger assemblies into an open position against said cams. A reversible electric motor within the housing has an output shaft geared to the cam shaft. A power source, a switch and an electrical circuit within the housing connects said motor. The switch under the control of an arm stub may be activated in one direction, said cams rotating in one direction moving said finger and thumb assemblies inwardly to grip an object, deactivating said switch stopping said fingers. Successively activating said switch in the opposite direction reversing said motor, said cams rotating in the opposite direction pivoting said thumb and finger assemblies to move outwardly releasing said object.
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patent: 1285617 (1918-11-01), Caron
patent: 1499052 (1924-06-01), Carson
patent: 1507682 (1924-09-01), Pecorella et al.
patent: 2364313 (1944-12-01), Pecorella
patent: 2553827 (1951-05-01), Mason
patent: 2580987 (1952-01-01), Alderson
patent: 2847678 (1958-08-01), Opuszenski
patent: 3418661 (1968-12-01), Allison et al.
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