Rock lifting device

Details Rock lifting device Rock lifting device

1982-09-30

1985-03-26

Marbert, James B.

Handling: hand and hoist-line implements

Grapple

Lewises

294 96, B66C 166

Patent

active

045069247

ABSTRACT:
A rock lifting device having an elongated shaft and at least two feather members. A pair of wedge surfaces are formed on the outer surface of the shaft adjacent its bottom end. The top end of each of the wedge surfaces is located farther inwardly from the outer surface of the shaft than its bottom end of the wedge surface. The wedge surfaces are substantially planar. Each of the feather members has a shank portion, an arm member extending outwardly from its top end, and a wedge portion extending from the bottom end of the shank portion. The wedge portion has a wedge surface upon its inner face. The wedge surfaces of the feather members mate with the wedge surfaces of the shaft. A transversely extending bore hole passes through the top of the shaft and a clevis attached to a chain may be secured thereto. There is also structure for securing the feather members to the shaft.

REFERENCES:
patent: 884198 (1908-04-01), Neddo
patent: 2719747 (1955-10-01), Layne

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