Clamp for circular cutting tool

Details Clamp for circular cutting tool Clamp for circular cutting tool

1991-02-01

1992-08-18

Bishop, Steven C.

Cutters, for shaping

Including holder having seat for inserted tool

With separate means to fasten tool seat to holder

407 46, 407107, 408714, B23B 2912

Patent

active

051393719

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a clamp having a clamp head which is provided with a recess for holding a circular cutting tool, the bottom side of which has a centering profile which engages the complementary recess of the clamp.
DE-AS 11 36 185, GB Patent Nos. 465,537 and 1,094,614, and DE-OS 22 60 097 disclose clamps for circular cutting tools. It is common to all specifications that centering is done simultaneously with the clamping of the circular cutting tools. Hence, the circular cutting tools are provided with recesses having the form of truncated cones (DE-AS 11 36 185), or with centering projections at the bottom in the form of spherical segments (GB Patent No. 465,537), truncated cones (GB Patent No. 1,094,614 and DE-OS 22 60 097), or truncated pyramids (DE-OS 22 60 097). The corresponding recesses in the clamp must be configured complementarily so as to ensure a correct fit of the circular cutting tool.
Fits in the form of spherical segments and corresponding spherical recesses are difficult to manufacture, if a close fit is to be ensured. The same applies to pyramidal recesses. Truncated cones and the corresponding conic recesses involve the most simple way of manufacturing. Theoretically, this solves the problem of a centered fastening. However, practice has shown that manufacture requires observance of prescribed tolerances and for economical reasons these tolerances are kept in a broad range. Consequently, an exact fitting between the centering piece of the circular cutting tool and the conic recess in the supporting part can only be achieved if all tolerances are zero or if plus and minus tolerances of cone and conic bore equal zero. In other words, it is unlikely that the circular cutting tool has full contact fit and at the same time is guided free of play at the cone.


SUMMARY OF THE INVENTION

Hence, it is the object of the present invention to permit a centered clamping of circular cutting tools while the circular cutting tools rest firmly and evenly on the bottom of a conic recess in a receptacle after clamping. At the same time, a contact of the receptacle with parts of the clamp permits centering and guiding the circular cutting tool. For circular cutting tools of the kind known, this object is achieved by providing the clamp head with a bearing bore to support a cup-shaped insert having a cylindrical projection which engages the bearing bore. The cup-shaped insert has a receptacle made of an elastically deformable material, the receptacle having a recess which is configured as a truncated hollow cone. The centering profile of the circular cutting tool is configured as a truncated cone; the converging cone angle of the recess is by 1 to 5 degrees smaller th an the one of the centering profile.
Providing an additional element, the cup-shaped insert permits using an inexpensive material for the manufacture of the clamp and employing high-duty, elastic material only for the cup-shaped insert. Moreover, this permits to significantly simplify the manufacture since the cup-shaped insert is basically lathe work which is easy to manufacture. The same simple but high-precision manufacture applies to the bearing bore in the clamp.
The cup-shaped insert has a cylindrical projection which is inserted in the bearing bore of the clamp and a receptacle which is disposed on top of the bore to support the truncated cone i.e. the centering profile of the cutting tool. The basic difference, however, as compared to prior art, is that the converging cone angle of the conic recess in the receptacle is smaller than the converging cone angle of the centering profile such that while inserting the circular cutting tool, the surface of the latter does not contact the bottom of the recess and there is an annular contact made between the rim of the recess and the surface of the truncated cone. Due to the small difference between the two conical angles, 1 to 5 degree, the play between the recess and the circular cutting tool contact surface is at a minimum. However, since the receptacle i

REFERENCES:
patent: 4111587 (1978-09-01), Hatanaka
patent: 4456408 (1984-06-01), Glasow
patent: 4552491 (1985-11-01), Parker
patent: 4893967 (1990-01-01), Briese

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