Handling: hand and hoist-line implements – Grapple – Expanding
Patent
1998-10-15
1999-10-26
Kramer, Dean J.
Handling: hand and hoist-line implements
Grapple
Expanding
2941101, B66C 154
Patent
active
059714573
ABSTRACT:
An internal lifting device for precast concrete utility vault boxes having a multitude of configuring shapes, the device comprises a pair of forked shape lifting legs swingable between retracted and expanded positions. The legs being connected at a intermediate point to the ends of a spreader bar that provides horizontal adjustably. Sheave are mounted on the upper ends of the legs to aid a single flexible steel cable that forms a triangular configuration to a lifting attachment. The lower ends the legs having fixed shoes with outwardly projecting portions that engages the internal side surfaces of a utility vault box unit with the legs expanded, with the legs retracted the legs and shoes are freely moveable vertically between the sidewalls of the vault box unit. When upward force is applied to the lifting attachment the uppermost portions of the legs swing inwardly and the lowermost portions swing outwardly to engage the internal side surfaces of the vault box unit, thus lifting and supporting the vault box and forming an A-shape configuration in the expanded position. The device is particularly adapted for efficient use with precast concrete utility vault box units, and provides for a rapid and efficient operation in the lifting and manipulating of the vault box units with a truck mounted crane.
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