Handling: hand and hoist-line implements – Grapple – Expanding
Patent
1995-01-24
1996-02-13
Cherry, Johnny D.
Handling: hand and hoist-line implements
Grapple
Expanding
294 62, B66C 154
Patent
active
054907020
ABSTRACT:
A tool to releasably engage in a channel of a concrete block for lifting provides an elongate body rod defining a fastening loop in its upper portion and carrying in its lower portion two radially extending fins having an obtuse central angle less than a straight angle therebetween. Each fin pivotally supports vertically spaced, parallel connector links that pivotally interconnect vertically orientated fastening arms for similar radial motion. The body provides at least one fixed fastening arm extending on a line bisecting the central angle between the two fins. Release mechanism provides a release collar slidable on the body between the fins and fastening ring. The collar pivotally carries connector links that interconnect with the upper fastening arms to radially move the fastening arm responsive to collar motion. A compression spring carried about the body rod between the collar and the fastening ring biases the collar downwardly and responsively the fastening arms outwardly. The biasing force is related to the tool weight so that in relaxed condition the fastening arms interconnect within a block channel, but when the tool is lifted by the release collar the fastening arms move to release interconnection within a block channel.
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Bergman Keith S.
Cherry Johnny D.
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