Cutting by use of rotating axially moving tool – Tool-support with means to move tool relative to tool-support – To move radially
Patent
1997-10-23
1999-10-05
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Tool-support with means to move tool relative to tool-support
To move radially
407 37, 407 45, 407 76, 407 78, 408185, 408197, 408233, B23B 2908
Patent
active
059612592
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to machine tools of the rotatable type as are used, for example, in metal drilling or boring operations. In particular, the invention relates to rotatable tools in which a head, which usually carries a cutting means, is interchangeably assembled with a drive element, such as a shank that is directly mountable in a driving machine, or an intermediate piece, such as an extension or diameter reduction piece, which piece may be in turn assembled to a shank.
The invention is concerned with an interchangeable connection between the head and a drive element in such tools and with a mechanism for transversely adjusting the position of the head, and thereby usually a cutting means, relative to a drive element, for example to allow the tool to be adjusted to provide different boring or drilling diameters.
BACKGROUND ART
In rotatable cutting tools having a cutting head that is separable from a driving element such as a shank, it is necessary that the driving interconnection between the two be as rigid as possible while allowing them to be relatively readily assembled and disassembled.
German published patent application DE 31 30 484 A1 discloses a rapid change tool holder comprising a shank and a head. The head carries a cutting insert and is detachably clamped to the shank. The facing end surfaces of the shank and the head are shaped to provide a "multiple form-locking" of one to the other. The multiple form-locking that is disclosed comprises two protrusions on the shank, each having the cross section of an equilateral triangle, and two facing recesses in the head for receiving the protrusions, wherein the dimensions and pattern of the recessed end is the exact negative of the protrusions on the shank. This multiple form-locking is described as providing high stability, however the rigidity of this interconnection is limited due to one part being an exact negative of the other.
The means for clamping the head to the shank in DE 31 30 484 A1 includes a tensioning bolt which passes axially through the shank and which has a formed end that is approximately T-shaped in cross section. This formed end is receivable in a correspondingly shaped mounting recess in the head. However the mounting recess includes an end stop and the arrangement is such that the head can be assembled on the shank from one sideways direction only. Furthermore the head must be accurately positioned for the formed end to enter the mounting recess. This restricts the ease and therefore the rapidity with which one head can be exchanged for another on the shank.
DE 31 30 484 A1 also discloses that the end stop of the mounting recess in the head may include a screw. This would allow sideways adjustment of the position of the head relative to the shank, but the amount of such adjustment is quite limited.
DISCLOSURE OF THE INVENTION
The present invention seeks to provide an improved rotatable machine tool of the type having a head and a drive element which provides for diameter wise adjustment of the head. In comparison to the above described prior art, a machine tool according to the invention has improved rigidity and a head that is more readily able to be exchanged for another on a drive element.
According to a first aspect of the invention there is provided rotatable machine tool apparatus comprising: detachably mounting the head to the drive element, seating within the-slideway and a clamping system, system is operable to force the bearing part to wedgingly engage the slideway for transmission of torque from the drive element to the head, to allow sliding movement of the bearing part within the slideway for adjustment of the head transversely of the drive element.
The drive element could be a shank, or an extension piece or reduction piece that is connectable to a shank. Rotatable machine tools with which the invention is concerned normally include or are connectable to a shank that is mountable in a rotating drive means for the tool.
Typically the head will be for mounting a cutting means in the form o
REFERENCES:
patent: 3296897 (1967-01-01), Konwal
patent: 3704958 (1972-12-01), Gulibon et al.
patent: 3795454 (1974-03-01), Elchyshyn
patent: 4101239 (1978-07-01), Wohlhaupter
patent: 4784542 (1988-11-01), Tack et al.
patent: 4848199 (1989-07-01), Kelm
patent: 5040931 (1991-08-01), Spivey et al.
patent: 5330297 (1994-07-01), Engstrand
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