Chamfer cutter

Details Chamfer cutter Chamfer cutter

2000-11-27

2002-04-09

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool-support with means to move tool relative to tool-support

C408S080000, C408S186000

Reexamination Certificate

active

06368032

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a chamfer cutter, and more particular to a chamfer cutting tool which is used for chamfering a threaded hole.
2. Description of Related Art
In general, a countersink has to be machined in a threaded hole of a work piece, so that a head of a screw may be flush with a surface of the work piece, etc. A conventional chamfer cutter, as shown in
FIGS. 7 and 8
, is composed of a tool rest (
40
), a housing (
50
), a tool blade (
41
), an adjusting nut (
60
), and a locking nut (
61
).
The tool rest (
40
) has a lower smooth part (
401
) and an upper threaded part (
402
). A shaft (
403
) is provided on a top of the tool rest (
40
) for fitting in a clamping chuck (not shown or numbered). A first channel (
404
) is longitudinally defined through an outer periphery of the tool rest (
40
). Two first threaded apertures (
405
) are transversally defined in the outer periphery of the tool rest (
40
) and in communication with the first channel (
404
). The tool blade (
41
) is received in the first channel (
404
) and two first screws (
42
) respectively extend through the first threaded apertures (
405
) to fasten the tool blade (
41
). A blind hole (
406
) is defined at a bottom surface of the tool rest (
40
) and a resilient member (
43
) is provided in the blind hole (
406
).
The housing (
50
) has a tapering part (
51
) formed at a bottom end thereof. A chamber (
52
) is defined at a top of the housing (
50
). A second channel (
53
) is longitudinally defined at an outer periphery of the housing (
50
) and in alignment with the first channel (
404
). The tool blade (
41
) is also received in the second channel (
53
). An annular slot (
54
) is defined at an upper portion of the outer periphery of the housing (
50
).
The tool rest (
40
) is received in the chamber (
52
) with the threaded part (
404
) extending out from the housing (
50
). The adjusting nut (
60
) with a female thread (
602
) and the locking nut (
61
) are in turn engaged with the threaded part (
404
). The adjusting nut (
60
) has a flange (
601
) in alignment with the annular slot (
54
), and two second threaded apertures (not numbered) transversally defined through the flange (
601
). Two second screws (
603
) respectively extend through the second threaded apertures to enter into the annular slot (
54
) and abut an upper edge of the annular slot (
54
) under a force of the resilient member (
43
).
In machining of a threaded hole of a component, when the tapering part (
51
) is stopped by a periphery defining the threaded hole, the tool rest (
40
) can continue to move down to chamfer the threaded hole and will not stop until the second screws (
603
) arrive at a bottom edge of the annular slot (
54
).
Referring to
FIG. 9
, in adjustment, the locking nut (
61
) and the adjusting nut (
60
) are screwed up to decrease a distance between a cutting edge (
411
) of the tool blade (
41
) and a bottom edge of the tapering part (
51
). Thus, the cutter can chamfer a deeper countersink.
However, the conventional chamfer cutter has following shortcomings:
1. It is inconvenient to adjust the cutting edge (
411
) by screwing the adjusting nut (
60
) and the locking nut (
61
).
2. Because the threaded part is provided on the tool rest for engaging with the nuts (
60
,
61
), the chamfer cutter is long and vibrations and shudders can transmit along the cutter during a machining operation.
3. The chamfer cutter has a high manufacturing cost because of the large number of elements.
Therefore, the invention provides an improved chamfer cutter to mitigate and/or obviate the aforementioned problems.
SUMMARY OF THE INVENTION
A main objective of the present invention is to provide a chamfer cutter which is easy to be adjusted.
Another objective of the present invention is to provide a chamfer cutter which has no vibration or shudder during use in a machining operation.
Another objective of the present invention is to provide a chamfer cutter which has a low manufacturing cost.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 2187221 (1940-01-01), Brown
patent: 2929278 (1960-03-01), Muldoon
patent: 3645640 (1972-02-01), Zukas
patent: 3762831 (1973-10-01), Nicholson
patent: 3233435 (1983-03-01), None

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