Shearing hollow stock
AssigneeTI (Group Services) Limited
InventorJohn Edward Hartley
Life of this patent
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Abstract
An internal member for supporting a hollow body during shearing in the form of a close-fitting solid body. The body comprises at least portions meeting in the shearing plane and each portion including at least one split ring having a single gap in its periphery to allow it to expand to fit the hollow body. Expansion may be effected by axial movement of frusto-conical plugs corresponding to and co-operating with frusto-conical inner surface in the rings. Each ring may either comprise a single component, preferably notched on its inner face to increase flexibility, or be in the form of a thin split cylindrical shell surrounding a plurality of inner segments.
Claims4
An assembly for shearing a hollow body comprising a pair of external shear blades, each of said shear blades having an aperture therein to receive said body, said blades meeting in a common shearing plane and being relatively movable in a direction parallel to said plane to shear said body, an internal shearing member lying within said apertures, said member comprising a first expandable portion lying on one side of said plane and a second expandable portion lying on the other side of said plane, said portions being independently movable and each of said portions comprising a circumferentially extending surface having therein only a single gap, and means for expanding said portions simultaneously to substantially fill a hollow body placed in said apertures, said portions being relatively movable in a direction parallel to said plane on relative movement of said external shear blades.
Dependencies are inferred from the claim text.