Cutters – for shaping – Including holder having seat for inserted tool – With separate means to fasten tool to holder
Reexamination Certificate
1999-05-05
2001-02-20
Tsai, Henry (Department: 3722)
Cutters, for shaping
Including holder having seat for inserted tool
With separate means to fasten tool to holder
C407S102000, C407S105000
Reexamination Certificate
active
06190095
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates to cutting tools with removable inserts, such as indexable inserts, for use in turning and milling operations, and more specifically to cutting tools with insert attachment of a so called screw clamping type.
PRIOR ART
There is a wide range of various designs present wherein an indexable insert is secured in a toolholder by the use of a screw or a modified bolt. Common to these designs is that the screw, or the modified bolt, is inserted in a thread cutted in a toolholder, directly of via another threaded means.
A problem with a design of this type is that the screw or the bolt has to be completely unscrewed in order for the insert to be detached. This means, among others, that there is a risk that some of these articles, which usually are of small size, will be lost.
Another problem occurs in situations where accessibility, due to the attachment of the cutting tool in the operating machine, is limited.
Securing or detaching of the insert in such situations may necessitate the detachment of the complete cutting tool from the machine, in order to index the insert in a more spacious location. This operation is time consuming.
Thereafter, when the cutting tool is returned in place in the machine it has to be carefully calibrated to ensure a proper working position, which results in further losses of time.
SUMMARY OF THE INVENTION
The object of the present invention is to solve the problems above.
According to the invention, the insert is secured in the toolholder by the use of a specially designed bolt, said bolt being fitted into an open channel running across an outer end of the toolholder. The bolt is secured in place by a nut due to a tapered portion of said nut that after tightening is in engagement with a corresponding recess in the channel. The tightening also provides a securing force on the insert attached by the bolt.
The invention allows the insert as well as the nut to be attached to the bolt during securing or detaching, thereby eliminating the risk of losing separate articles.
Further, the assembly formed in this manner may easily be inserted into the channel of the toolholder without any need to detach the toolholder, substantially independent of how the toolholder is mounted in the operating machine. Since there is no need to unfasten the toolholder, and the insert at the same time can be fitted to the proper position with high accuracy, calibration is not necessary after indexing.
By the use of a slightly bent bolt the bend can be utilized as counterstay when wrenching the nut, at the same time as a resilient bias is achieved.
REFERENCES:
patent: 1629667 (1927-05-01), Knipple
patent: 3662444 (1972-05-01), Erkfritz
patent: 3812547 (1974-05-01), Reich
patent: 3913197 (1975-10-01), Wolf
patent: 3965553 (1976-06-01), Faber
patent: 3996651 (1976-12-01), Heaton et al.
patent: 4364693 (1982-12-01), Lindsay
patent: 1602793 (1970-04-01), None
patent: 3305832 (1984-08-01), None
patent: 1218508 (1960-05-01), None
patent: 0994133 (1983-01-01), None
patent: 1207639 (1986-01-01), None
Tsai Henry
Young & Thompson
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