Apparatus for cold-working holes

Claim 1

An apparatus for cold-working holes comprising: a. a sleeve of a plurality of lengthwise strips restrained around the periphery at one end, wherein the restraint to the sleeve comprises a longitudinally split sectionalized quill to which the sleeve is fastened, b. a mandrel tapering to an enlarged diameter and thence to a reduced diameter slideably mounted inside the sleeve to act in combination inside a hole in a workpiece to radially expand the sleeve and cold-work the hole as the enlarged diameter of the mandrel passes through the hole, and c. means for constraining the sleeve wherein said means comprises a ring encircling the quill and an elastic annular section between the ring and the quill.

Claim 2

An apparatus for cold-working holes comprising: a. a sleeve of a plurality of lengthwise strips restrained around the periphery at one end, wherein the restraint to the sleeve comprises a longitudinally split sectionalized quill to which the sleeve is fastened, b. a mandrel tapering to an enlarged diameter and thence to a reduced diameter slideably mounted inside the sleeve to act in combination inside a hole in a workpiece to radially expand the sleeve and cold-work the hole as the enlarged diameter of the mandrel passes through the hole, and c. means for constraining the sleeve wherein said means comprises a ring encircling the quill and an elastic annular section between the ring and the quill.

Claim 3

An apparatus for cold-working holes comprising: a. a sleeve of a plurality of lengthwise strips restrained around the periphery at one end wherein the restraint to the sleeve comprises a ring to which the sleeve is fastened, b. a mandrel tapering to an enlarged diameter and thence to a reduced diameter slideably mounted inside the sleeve to act in combination inside a hole in a workpiece to radially expand the sleeve and cold-work the hole as the enlarged diameter of the mandrel passes through the hole, and c. means for constraining the sleeve.

Claim 4

An apparatus for cold-working holes comprising: a. a sleeve of a plurality of lengthwise strips restrained around the periphery at one end wherein the restraint to the sleeve comprises a ring to which the sleeve is fastened, b. a mandrel tapering to an enlarged diameter and thence to a reduced diameter slideably mounted inside the sleeve to act in combination inside a hole in a workpiece to radially expand the sleeve and cold-work the hole as the enlarged diameter of the mandrel passes through the hole, and c. means for constraining the sleeve.

Claim 6

An apparatus for cold-working holes in a workpiece comprising: a. a ring, b. a sleeve of a plurality of lengthwise strips fastened around the periphery of one end to the ring, c. a mandrel slidably mounted inside the sleeve with a taper to an enlarged diameter thence to a reduced diameter extending outside the unrestrained end of the sleeve prior to cold-working, the mandrel and sleeve combine to radially extend the sleeve to the cold-work the hole as the enlarged diameter of the mandrel passes through the hole, d. means for constraining the sleeve wherein the means for constraining the sleeve comprises: e. an annular support member extending inward from the ring encircling the sleeve and sized to prevent contact with the sleeve, and f. a second sleeve slideably mounted to and encircling the support member with a radially inward extending projection making resilient contact with the first sleeve.

Claim 7

An apparatus for cold-working holes in a workpiece comprising: a. a ring, b. a sleeve of a plurality of lengthwise strips fastened around the periphery of one end to the ring, c. a mandrel slidably mounted inside the sleeve with a taper to an enlarged diameter thence to a reduced diameter extending outside the unrestrained end of the sleeve prior to cold-working, the mandrel and sleeve combine to radially extend the sleeve to the cold-work the hole as the enlarged diameter of the mandrel passes through the hole, d. means for constraining the sleeve wherein the means for constraining the sleeve comprises: e. an annular support member extending inward from the ring encircling the sleeve and sized to prevent contact with the sleeve, and f. a second sleeve slideably mounted to and encircling the support member with a radially inward extending projection making resilient contact with the first sleeve.

Claim 8

An apparatus for cold-working holes comprising: a sleeve of a plurality of lengthwise strips fastened around the periphery at one end to a ring; a mandrel slideably mounted inside the sleeve with a taper to an enlarged diameter thence to a reduced diameter extending outside the unrestrained end of the sleeve prior to cold-working; an annular support member extending inward from the ring, encircling the sleeve and sized to prevent contact with the sleeve; a second sleeve slideably mounted to and encircling the support member with a radially inward extending projection to resiliently keep the first sleeve in contact with the mandrel; and said mandrel enlarged diameter sized to be pulled inside the sleeve through the hole to radially expand the sleeve and cold-work the hole.

Claim 9

An apparatus for cold-working holes comprising: a sleeve of a plurality of lengthwise strips fastened around the periphery at one end to a ring; a mandrel slideably mounted inside the sleeve with a taper to an enlarged diameter thence to a reduced diameter extending outside the unrestrained end of the sleeve prior to cold-working; an annular support member extending inward from the ring, encircling the sleeve and sized to prevent contact with the sleeve; a second sleeve slideably mounted to and encircling the support member with a radially inward extending projection to resiliently keep the first sleeve in contact with the mandrel; and said mandrel enlarged diameter sized to be pulled inside the sleeve through the hole to radially expand the sleeve and cold-work the hole.