Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Locking device
Patent
1981-09-09
1984-08-21
Cherry, Johnny D.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Locking device
B66C 134
Patent
active
044666519
ABSTRACT:
The present invention is a block including a hollow housing within which a cylindrical container is loosely received and retained against axial motion relative to the housing. A hook supporting shaft is inserted within this container and the shaft is axially slidable relative to the container within predetermined limits. A shock absorbing mechanism within the container dampens the sliding motion of the shaft. The last named mechanism may include a dashpot with a dashpot housing mounted to the shaft and piston supported by the container. A flange projecting outwardly from the dashpot housing slidably engages the internal surface of the container and guides the sliding of the shaft. The housing includes a base member through which the shaft is inserted into the container. An annular collar comprised of two axially split collar sections is assembled around the shaft after the shaft is inserted through the base member. This collar comprises an end member of the container. Also, the collar defines an axial slot which slidably receives an axial elongated key projecting outwardly from the shaft. This key and slot also guides the axial sliding motion of the shaft. The container and shaft, are rotatable about their axis and relative to the housing. A mechanism is provided to selectively lock the container and shaft against such rotation. Also, the shock absorption mechanism may include a coil spring and a spring tension adjustment. The lower end of the shaft comprises a yoke to which a hook is pivoted. The hook includes a body and hook member which mates with the body and is held in place by a keeper.
REFERENCES:
patent: 2043460 (1936-06-01), Young
patent: 2203139 (1940-06-01), Grau et al.
patent: 2513990 (1950-07-01), Bennett
patent: 2552758 (1951-05-01), Andersen
patent: 2570320 (1951-10-01), Christensen
patent: 2576261 (1951-11-01), Minor
patent: 2585408 (1952-02-01), Roberson
patent: 2622846 (1952-12-01), Bennett
patent: 3037803 (1962-06-01), Phillips
patent: 4120189 (1978-10-01), Jones
B. J. Hughes, "Hooks and Links", pp. 12-15, Prior Art.
Joy Manufacturing Co., "Joy Oil Tools-Hydra-Hooks", 4 pp., Prior Art.
Sowa Joseph P.
Sowa Michael J.
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