Handling: hand and hoist-line implements – Grapple – Expanding
Patent
1990-04-16
1992-03-10
Focarino, Margaret A.
Handling: hand and hoist-line implements
Grapple
Expanding
294 8612, 294 8625, B66C 110
Patent
active
050944967
ABSTRACT:
A two phase quick setting and quick releasing pipe pulling device having an outer housing for engaging the exterior of a plastic pipe and interior radially expandable and contractible jaws that can be quickly set on the interior surface of a plastic pipe by applying a blow to the housing with the expandable jaws responsive to a pulling force on a central shaft located in the housing to further radially expand the jaws to further engage the interior of a plastic pipe as one pulls on the pipe pulling device with the expandable jaws also operable to be quickly disengaged from the interior of the plastic pipe by applying an axial blow to the central shaft of the pipe pulling device.
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Focarino Margaret A.
Kramer Dean J.
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