Turning – Lathe – Tool rest
Patent
1993-10-29
1995-02-28
Terrell, William E.
Turning
Lathe
Tool rest
407104, 407106, 407108, B23B 2708, B23B 2902
Patent
active
053926749
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an arrangement for tools for cutting and machining, in particular, turning in restricted spaces, for example, turning inside a hole or in a tube-like workpiece.
Tools intended for operations of this kind are previously known and, as a general rule, comprise a cutter of hardened metal material, carbide material or the like attached to the end of a shaft by means of a threaded connection. To remove a worn cutter so a new one can be installed, it is necessary to fully loosen a screw passing through the cutter before the cutter can be removed or attached. In this replacement operation, it is necessary to keep track not only of the cutter, which in many cases is very small, but also of the loose screw, and to fit the latter into a threaded hole in the shaft. This makes the operation difficult so the machine operator tends to use a cutter for an excessive period in order to avoid having to change the cutter.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a novel arrangement which securely grips the cutter and facilitates the replacement of the cutters without the need for handling of loose components other than the cutter itself.
This object can be achieved by the provision of a seat at the end part of the shaft. The seat provides positioning of and a stable support for a cutter in at least two of the principal directions utilized in the machining operation, so that the stresses imposed on the cutter during such machining are transferred in an effective fashion to the shaft. At least one tightenable fastening device is arranged on the shaft and engages with the cutter after tightening so as to force it against at least one surface on the seat. The fastening device is intended to engage stop parts on the cutter only after the cutter, through displacement of the cutter relative to the seat on the shaft and whilst the cutter is still in contact with the seat, has reached its operating position.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in more detail below with reference to the accompanying drawings, in which:
FIG. 1 is a side elevational view from the side of the end part of a first embodiment of a tool arranged in accordance with the invention;
FIGS. 1A and 1B are enlarged views of portions of the tool of FIG. 1 within the 1A and 1B lines of FIG. 1;
FIG. 2 is a front elevational view of the same tool;
FIG. 3 is a cross-sectional view taken along the line A--A in FIG. 2;
FIG. 4 is a cross-sectional view taken along the line B--B in FIG. 2;
FIG. 5 is a side elevational view of a modified embodiment of a cutter viewed from the side facing towards the shaft;
FIG. 6 is a side elevational view of the cutter in accordance with FIG. 5 viewed from the side on which the cutting edge projects;
FIG. 7 is a side elevational view of the cutter in accordance with FIG. 5 viewed from the outward-facing side;
FIG. 8 is a cross-sectional view taken along the line A--A in FIG. 7;
FIG. 9 is a cross-sectional view taken along the line B--B in FIG. 7; and
FIG. 9A is a cross-sectional view of a support shaft upon which the cutter of FIG. 9 can be fitted.
DETAILED DESCRIPTION OF THE INVENTION
The numeral 1 is used to designate a shaft 1 of a tool holder, which at its end is intended to carry a tool, more specifically, a cutter generally designated by 2. The tool 2 in question here is intended for turning in restricted spaces, for example, inside a hole, or in a tubular workpiece or the like.
The shaft 1, which may be of circular cross-section along a further part 3 indicated in FIG. 2 by a dashed and dotted line, exhibits a thinner end part 4 of non-round cross-section produced by machining one side thereof at its end surface 5. Arranged on or at the end surface 5 is a transverse groove 6 terminated by a curved end wall 7. Situated next to the transverse groove 6 in a partially overlapping relationship is a circular recess 8 with a coaxially threaded central bore 9 (FIG. 4) arranged in the longitudinal direction of the shaft 1.
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patent: 4102591 (1978-07-01), Alcorn
patent: 4602897 (1986-07-01), Teets
patent: 4714384 (1987-12-01), Lagerberg
Mircona AB
Terrell William E.
LandOfFree
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