Cutters – for shaping – Including holder having seat for inserted tool – With separate means to fasten tool to holder
Patent
1997-02-24
1999-05-04
Han, Frances
Cutters, for shaping
Including holder having seat for inserted tool
With separate means to fasten tool to holder
407107, 407109, 82160, 76 80, B23B 2716
Patent
active
058996435
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a tool for the replacement of a cutting insert which is gripped in a seat between two leg portions of a cutting insert holder.
Usually, such tools are designed as levers. When replacing the cutting insert, one lever end is propped by one of the two leg portions forming the seat for the cutting insert. The free lever end can then be manually adjusted, thereby creating a gap between the two leg portions and enabling the extraction of the cutting insert from the seat.
In such a case, it is not always possible to adjust the free lever end according to a predetermined length. There is a risk that the gap between the leg portions will be expanded to a non-permissible degree. This will plastically deform the leg portions, so that, after disengaging the lever, they will not return to their initial setting. As a result, the seat will be widened, preventing firm securing of the cutting insert and necessitating replacement of the cutting insert holder.
SUMMARY OF THE INVENTION
The object of the invention is to create a user-friendly tool which facilitates the replacement of a cutting insert without the risk of damaging the cutting insert holder.
According to the invention, this is accomplished in that a first supporting part is arranged on the basic body and is supported by a seat of the cutting insert holder, in that, at a distance from the first supporting part, a second supporting part is mounted, wherein this second part is mounted in another seat mounted within the range of a leg portion of the seat, or is propped by the cutting insert, and in that at least one of the two supporting parts is eccentrically adjustable around a rotation axis by means of an actuating element, so as to allow adjustment of the distance between the two supporting parts.
In such a design, the basic body can be mounted on the cutting insert holder so that the first supporting part is supported by the associated seat. In this position of the basic body, the second supporting part can be mounted, for example, in a seat arranged on one of the two leg portions. Both supporting parts can be moved, relatively to each other, by means of the actuating element and the eccentric arrangement of at least one of the supporting parts. Thereby the two leg portions will be spread, so that the clamping, by which the cutting insert is retained, is eliminated. However, the two leg portions can only be mutually adjusted along a predetermined fixed distance. Said distance is determined by the dimension of the eccentricity. This safety prevents plastic deformation of the leg portions. According to the invention, it is, however, also possible for the second supporting part to be supported by the cutting insert. For example, a special seat can be provided for this purpose on the cutting insert. At the same time, it is also possible to support the second supporting part by means of a body surface of the cutting insert.
In the above cases, the cutting insert can be forcefully moved in the seat by rotation of the eccentrically mounted support part. According to the design of the seat for the second support part, the cutting insert can either be extracted from, or inserted into, the seat of the cutting insert holder.
However, it is also possible to design the seat of the second support part in such a way that the cutting insert can be extracted from, as well as inserted into, the seat of the cutting insert holder.
In one preferred embodiment of the invention, the basic body has a bore in which a bolt rests, which can be rotated around its axis, and the support part is mounted on the front end of the bolt, eccentrically to the rotation axis. Within the bore, the bolt forms a pivot bearing, which can be produced with little effort. In order to provide bolt rotation, it is, for example, possible to connect to the bolt a grip with a handle that acts as an actuating element. When adjusting the handle, the bolt rotates in the pivot bearing. Due to this adjustment, the support part, which is mounted eccentrically to
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patent: 5697271 (1997-12-01), Friedman et al.
Han Frances
Iscar Ltd.
Tsai Henry W. H.
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