US 6,352,395 B1Granted

Tool holder and tool holder attachment mechanism

AssigneeNikken Kosakusho Works Ltd.

InventorsMasakazu Matsumoto, Masahiro Taguchi, Yusaku Yamamoto

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Abstract

A tool holder includes a holder body which in turn includes a shank portion, a flange portion, and a tool attachment portion; a taper cone fitted to the shank portion; an elastic member interposed between a rear-end face of the flange portion and a front-end face of the taper cone; and a stopper member disposed on the shank portion so as to support a rear-end face of the taper cone. The outer surface of the taper cone is tapered at an angle equal to that at which the wall surface of a taper hole formed in a spindle of a machine tool is tapered. The inner surface of the taper cone and the outer surface of the shank portion are equally tapered at an angle smaller than the angle at which the outer surface of the taper cone is tapered. Through drawing of the holder body, the taper cone expands radially to thereby be tightly held within the taper hole. A spacer is bonded to the end face of the spindle so as to eliminate a gap which is formed between the flange portion and a spindle.

Claims9

Dependent claims

A tool holder to be removably fitted into a taper hole which is formed in a spindle of a machine tool such that diameter decreases rearward comprising:

a holder body having a shank portion and a flange portion formed at a front side of the shank portion;
a taper cone fitted to the shank portion and tapered such that diameter decreases rearward;
an elastic member interposed between a rear-end portion of the flange portion and a front-end portion of the taper cone fitted to the shank portion;
and
a stopper member disposed on the shank portion and adapted to support a rear-end face of the taper cone fitted to the shank portion,
wherein an outer circumferential surface of the taper cone is tapered at an angle equal to that at which a wall surface of the taper hole is tapered;
and
an inner circumferential surface of the taper cone and an outer circumferential surface of the shank portion are tapered at least partially with respect to an axial direction such that diameter decreases rearward, at equal angles smaller than the angle at which the outer circumferential surface of the taper cone is tapered.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/525,253Filed 14 Mar 2000
Priority: JP 11-07543319 Mar 1999
Granted: 5 Mar 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B23B 31/202
Characterized by features relating primarily to remote control of the gripping means: details of the jaws
B23B 31/117
Characterised by the retaining or gripping devices or their immediate operating means: retention by friction only, e.g. using springs, resilient…
B23B 2226/33
Materials of tools or workpieces not comprising a metal: elastomers, e.g. rubber
B23B 2231/2097
Slits of collets: having a special form not otherwise provided for