Chucks or sockets – Socket type – Spring biased jaws
Patent
1997-01-14
1998-08-04
Bishop, Stephen C.
Chucks or sockets
Socket type
Spring biased jaws
279 58, 279 97, 279103, 279 75, 409234, B23B 3120
Patent
active
057882495
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a cutting tool chuck for chucking a cutting tool and, more particularly, to a cutting tool chuck for chucking cutting tools, such as drill bits, reamers and center drills.
BACKGROUND ART
A conventional cutting tool chuck for chucking cutting tools, such as drill bits, reamers and center drills, has a collet and a fastening collar. The inside diameter of the collet is reduced by the fastening collar to grip a cutting tool inserted in the bore of the collet. When changing the cutting tool, the hold of the fastening collar on the collet is loosened to allow the collet to expand, the tool is removed from the collet, another cutting tool is inserted in the collet, and then the fastening collar is adjusted to reduce the inside diameter of the collet to grip the cutting tool.
When changing the cutting tool, the collet of the conventional cutting tool chuck needs to be removed from a holding member. When replacing a collet with another collet in a conventional cutting tool chuck, the collet and a fastening collar are removed from a holding member after loosening the fastening collar, and then another collet is mounted on the holding member. When replacing a collet with another collet in another conventional cutting tool chuck, the collet is removed from a holding member after removing a fastening collar from the holding member, and then another collet is mounted on the holding member. Thus, much time and labor is necessary for changing the collet of the conventional cutting tool chuck.
Accordingly, it is an object of the present invention to solve problems in the conventional techniques and to provide a cutting tool chuck for chucking a cutting tool, having a collet which can easily be changed.
DISCLOSURE OF THE INVENTION
According to a first aspect of the present invention, a cutting tool chuck for chucking a cutting tool comprises a holding member, a chuck sleeve connected to the holding member and provided with an axial straight bore and a taper bore formed in its front end, a fastening collar screwed on the chuck sleeve and provided with an inner annular guide groove, deep recesses formed in a side surface of the guide groove, and a shallow recesses formed in the same side surface of the guide groove, a drive shaft axially slidably fitted in the chuck sleeve and provided with a drive shaft control member having opposite end portions fitted in the guide groove and capable of being brought into engagement with the deep recesses or the shallow recesses of the fastening collar, a collet detachably fitted in the taper bore of the chuck sleeve, and a spring member resiliently engaged with the back end of the drive shaft.
In this cutting tool chuck for chucking a cutting tool, a groove of a large diameter is formed in a portion of the straight bore of the chuck sleeve, a collet receiving bore is formed in the front end of the drive shaft, a plurality of balls are retained in radial holes formed in an annular wall defining the collet receiving bore so as to be radially movable between the inner and the outer circumference of the wall defining the collet receiving bore, the plurality of balls are pressed by the inner circumference of the chuck sleeve so as to protrude into the collet receiving bore to hold the collet when the drive shaft is pulled up, and the plurality of balls drop into the groove of a large diameter and are pushed out of the collet receiving bore to release the collet when the drive shaft is pushed down.
According to the present invention, the fastening collar is turned so that the end portions of the drive shaft control member drop into the shallow recesses of the fastening collar and the drive shaft is pulled up to hold the collet, the fastening collar is turned so that the end portions of the drive shaft control member drop into the deep recesses of the fastening collar and the drive shaft is pushed down to release the collet. Thus, the collet can be chucked and released simply by turning the fastening collar.
According to the present inventi
REFERENCES:
patent: 2401071 (1946-05-01), Hillberg
patent: 3055671 (1962-09-01), Lewis et al.
patent: 3851930 (1974-12-01), Mattes
patent: 5622373 (1997-04-01), Tagami
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