US Patent: 3,485,388
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| Core Grab
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Patentee:
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| William C. Bohne (exact or similar names) - Wellsville, Allegany County, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 20, 1968 |
| Granted: |
Dec. 23, 1969 |
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Joel Havens
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Description: |
| Bean & Bean - patent attorneys
Abstract
A grab adapted to be inserted into a hollow cylindrical core of a heavy roll and then expanded to frictionally grip the core so that the roll may be lifted by the grab. Core grabs of various types have been widely used in industry for picking up heavy rolls, such as a roll of paper. All those of which I am aware, however, suffer from one or more disadvantages, including their inability to be automatically locked in place and released from within the roll core or the fact that their use results in excessive damage to the core and/or the material mound thereon. Excessive core damage results when the grab is provided with sharp teeth which are adapted to dig into the walls of the core, or the design of the grab does not permit the grab to apply pressure uniformly along the length of the core.
Claim:
A grab adapted to be inserted within a hollow core provided in an article and expanded into frictional engagement with said core to permit lifting of said article from a supporting surface, said grab being adapted to release said core upon subsequent lowering of said article onto a supporting surface, said grab comprising: an operating rod, said rod being connectible adjacent one end thereof to a lifting device and having cam means disposed adjacent an other end thereof; restraining means disposed on said rod for axial movement relative thereto; means to connect said restraining means with said rod; and a plurality of slips disposed around said rod for axial movement relative thereto, said slips being adapted to be inserted into said core and when inserted being adapted to be alternately engaged and released by said cam means for movement outwardly of said rod into and out of frictional engagement with said core to grab and release said article during successive first and second relative longitudinal movements of said rod and said restraining means, said slips having means engageable with an end of said core through which said slips are inserted to limit movement of said slips into said core, said restraining means being movable into a position when said slips are inserted in which said slips are restrained in engagement with said core end, said first longitudinal movement being obtainable by longitudinally inserting said other end of said rod into said core to position said slip means in engagement with said core end and said restraining means in said position and longitudinally retracting said rod with respect to said core to force said rod cam means into engagement with said slips and thereby effect movement of said slips into engagement with said core and lifting of said article from a supporting surface, and said second longitudinal movement being obtainable upon lowering said article onto a supporting surface by longitudinally moving said rod inwardly of said core and retracting said rod with respect to said core to permit said connecting means to remove said restraining means from said position and release said slips from said rod cam means, thereby permitting release of said slips from said core in order to release said grab from said article. |
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