Handling: hand and hoist-line implements – Spacing hoist bar or frame – Load gripping units
Patent
1978-09-13
1981-02-24
Cherry, Johnny D.
Handling: hand and hoist-line implements
Spacing hoist bar or frame
Load gripping units
74470, 74582, 267136, B66C 166, F16F 700
Patent
active
042523591
ABSTRACT:
A bidirectional force limiter for limiting the magnitude of a force applied along a line of action to a predetermined magnitude includes a slide assembly supported for reciprocating movement along its longitudinal axis by the spaced guide plates of a support structure. A yieldable force-bias element, such as a helical spring in compression, is constrained between the guide plates, and structure is provided for transmitting the applied force from the slide assembly to the biasing element to cause the slide assembly to displace and the biasing element to yield in response to the applied force. The force limiter is suitable for use, in a preferred mode, with cargo-container spreaders which are adapted to attach to and detach from cargo containers. The spreader carries a plurality of locks which are adapted to register with and engage complementary lock receiving structures on each container. A hydraulic actuator is linked to the locks through a rotatable shift to selectively actuate them between a locked position and an unlocked position to, respectively, attach the spreader to the container and detach the spreader from the container. The force limiter is connected between the hydraulic actuator and the spreader frame to limit the applied locking and unlocking forces to a predetermined, safe magnitude. The force limiter prevents excessively high hydraulic fluid pressure from damaging a jammed lock or over-riding safety devices designed to prevent unlocking when the spreader and attached cargo container are in a suspended position.
REFERENCES:
patent: 213974 (1879-04-01), Butler
patent: 594729 (1897-11-01), Crosby
patent: 1845816 (1932-02-01), Savage
patent: 2402400 (1946-06-01), Hewitt et al.
patent: 3086303 (1963-04-01), Weeks
patent: 3493258 (1970-02-01), Wyrough
patent: 3611827 (1971-10-01), Bottum et al.
patent: 3712661 (1973-01-01), Strand
patent: 3990722 (1976-11-01), Casad et al.
Cherry Johnny D.
Mulholland John H.
RPC Corporation
Winchell Bruce M.
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