| 摘要 |
An expandable chuck for insertion into a vertically oriented, longitudinally extending, cylindrical hollow core about which a web of paper or other material is wound to form a roll. An elongate body is dimensioned for insertion into the core. Mechanisms are connected to an upper portion of the body for engaging an upper end of the core to prevent the body from falling down through the core. A central lifting post is mounted to the body for vertical reciprocation relative thereto between a lowered position and a raised position. A plurality of jaws are connected by a linkage between the central lifting post and a lower portion of the body for movement from retracted positions in which they are disengaged from an inner surface of the core to extended positions in which they are grippingly engaged with the inner surface of the core. The jaws move from their retracted positions to their extended positions upon movement of the central lifting post from its lowered position to its raised position. The jaws extend radially from the body at equally circumferentially spaced locations. Hardware is connected to an upper end of the central lifting post for connecting thereto a hook or other connecting mechanism of an overhead crane. Hoisting of the hook with the crane will move the central lifting post to its raised position thereby grippingly engaging the jaws with the inner surface of the core. The roll can thus be lifted with the chuck. The chuck can thereafter be readily removed from the core by manually lifting the upper end engagement means to allow the central lifting post to move under the force of gravity to its lowered position, thereby disengaging the jaws from the inner surface of the core.
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