Collet
AssigneeKenmar Export Ltd.
InventorRichard F. Evans
Life of this patent
Estimating the term…
Abstract
A collet for an automatic bar feed machine tool having an outer sleeve 20 and an inner sleeve 21 reciprocable in the outer sleeve, a spring 26 to bias the inner sleeve 21 away from the gripping region 28 of the outer sleeve. Bar stock 33 is gripped in the collet by the outer sleeve end 22 acting on the end 29 of the inner sleeve, the bar being fed through the collet and short ends 36 falling away from the collet during feeding so that bar can be continuously fed through the collet without having to stop the machine to remove short ends.
Claims8
In a collet for an automatic machine tool, said collet including a spindle having an internally tapered portion, and an outer sleeve having a bore therethrough within said spindle, said outer sleeve having an externally tapered portion cooperating with the internally tapered portion of said spindle, the invention comprising an inner sleeve axially reciprocable between a retracted and an extended position within the externally tapered portion of the outer sleeve during operation of the machine tool, the inner sleeve being clamped in the outer sleeve when said inner sleeve is in its extended position and means for moving said inner sleeve to its axially retracted position during bar stock feeding, the arrangement being such that bar stock when clamped in the collet is clamped by the inner sleeve which is clamped in the bore of the tapered portion of said externally tapered portion of the outer sleeve and short bar stock ends are free to fall from the inner sleeve in its retracted position.
Dependencies are inferred from the claim text.