Winding core chuck

Claim 2

A chuck for supporting a roll core comprising a mounting shaft, a tapered section on said shaft, an expandible sleeve axially displaceable on said shaft and having surfaces slidably engageable with said tapered section, and whereby axial displacement of said sleeve in one direction along said tapered section causes the sleeve to expand and displacement of said sleeve in the opposite direction causes the sleeve to contract, and wherein the expandible sleeve includes a thrust ring separate from but axially restrained with respect to the sleeve, and means for maintaining the thrust ring concentric with said shaft and engageable with the end of a roll core when the chuck is inserted into a roll core, said thrust ring serving to cause displacement of the expandible sleeve up said tapered section as the sleeve and shaft are pushed into the roll core.

Claim 3

A chuck according to claim 1 and wherein interengaging parts between said expandible sleeve and said mounting shaft prevent angular displacement therebetween.

Claim 4

A chuck according to claim 1 and wherein the leading regions of the expandible sleeve are shaped to facilitate entry of the sleeve into a roll core end.

Claim 5

A chuck according to claim 1 and wherein means are provided to resiliently urge the sleeve towards a contracted condition.

Claim 6

A chuck according to claim 1 and wherein a nose cone is provided on the shaft to limit the axial displacement of the sleeve towards its contracted condition and said nose cone is shaped to facilitate entry of the chuck into the end of a roll core.

Claim 7

A chuck according to claim 1 and wherein said thrust ring is engaged in a recess in said sleeve and said means for maintaining said thrust ring in concentric relationship with said shaft is a wave spring engaged in said recess between said sleeve and said thrust ring, said wave spring serving to urge said thrust member radially outwardly of the axis of the shaft.

Claim 8

A chuck according to claim 1 and wherein said means for maintaining said thrust ring in concentric relationship with said shaft is a wave spring engaged in said recess between said sleeve and said thrust ring, said wave spring serving to urge said thrust member radially outwardly of the axis of the shaft.

Claim 9

A chuck for supporting a roll core comprising a mounting shaft, a tapered section on said shaft, an expandible sleeve axially displaceable on said shaft, said sleeve comprising a plurality of segments circumferentially disposed around said shaft, each of said segments presenting a surface for sliding engagement with said tapered section, whereby axial displacement of said sleeve relative to said shaft in one direction causes the sliding surfaces of said segments to slide up the tapered section of the shaft to expand the sleeve and displacement of the sleeve in the other direction from an expanded condition allows the sliding surfaces to slide down the tapered section to contract the sleeve, and wherein a thrust ring is engaged in a recess in the sleeve and means are provided for maintaining said thrust ring concentric with said shaft, said thrust ring being engageable with the end of a roll core, upon entry of the chuck into the core, to cause displacement of the sleeve relative to the shaft as the shaft is further inserted into the roll core.

Claim 10

A chuck for supporting a roll core comprising a mounting shaft, a tapered section on said shaft, an expandible sleeve axially displaceable on said shaft, said sleeve comprising a plurality of segments circumferentially disposed around said shaft, each of said segments presenting a surface for sliding engagement with said tapered section, whereby axial displacement of said sleeve relative to said shaft in one direction causes the sliding surfaces of said segments to slide up the tapered section of the shaft to expand the sleeve and displacement of the sleeve in the other direction from an expanded condition allows the sliding surfaces to slide down the tapered section to contract the sleeve, and wherein a thrust ring is engaged in a recess in the sleeve and means are provided for maintaining said thrust ring concentric with said shaft, said thrust ring being engageable with the end of a roll core, upon entry of the chuck into the core, to cause displacement of the sleeve relative to the shaft as the shaft is further inserted into the roll core.

Claim 11

A chuck according to claim 8 and wherein said segments present flat surfaces for sliding engagement with flat surfaces of said tapered section.

Claim 12

A chuck according to claim 8 and wherein a layer of self lubricating material is disposed between each segment and said shaft.

Claim 13

A chuck according to claim 8 and wherein a circumferential resilient restraint is provided for retaining the segments on the shaft and to urge the segments into a contracted condition for the sleeve.

Claim 14

A chuck according to claim 8 and wherein a nose cone is secured on the shaft adjacent the narrow end of said tapered section, said nose cone is shaped to facilitate entry of the chuck into the roll core and means are provided for limiting the axial displacement of the segments relative to the shaft in the direction of contraction of the sleeve.