TECHNICAL FIELD
Embodiments of disclosure relate to the field of milling tools  more particularly relates to clamping device used in milling tool.

BACKGROUND OF DISCLOSURE AND PRIOR ARTS
A typical milling machine is an apparatus that features a rotatable milling cutter having a number of indexable cutting inserts  where the milling cutter is passed over the work piece to remove material from the work piece. Once a cutting edge of an indexable cutting insert is worn out  the insert is removed and rotated or “indexed” to expose a sharp cutting surface.

Over the years  several basic approaches to indexing and securing cutting tool inserts have been developed. One method of clamping the inserts is by providing clamping on top of the inserts. In this method a wedge is used to clamp the cutting tool insert into the milling cutter. The “wedge-lock” top-clamping systems as shown in figs. 1 and 2 hold the insert in only one direction and  under operating conditions  inserts clamped in this fashion have a tendency to move unacceptably in both the radial and axial directions. In addition  the existing wedges are used with inserts having their seating surfaces above the cutting edge. Also  as the wedge moves in a linear motion during clamping there are chances of chipping off of the cutting edges of the cutting insert. Majority of the insert offering has the cutting edges above the seating area.

In light of the foregoing discussion  there is a need to develop a wedge type clamping which can be used for inserts having their cutting edges either above or below the cutting edge surface.

SUMMARY
The shortcomings of the prior art are overcome and additional advantages are provided through the provision of cutting insert as claimed in the present disclosure.

In one embodiment  a solution has been developed in the present disclosure which provides a top clamp  where the wedge/holder is provided with a pivot for preventing the chipping off of the cutting edge of the cutting insert. The pivot is provided so as to move the wedge in an arc. This movement in an arc prevents the wedge/holder from interfering with the cutting edges of the insert during clamping and unclamping of the insert and thus prevents chipping off of the cutting edge is the cutting insert.

The wedge/holder provided in the disclosure is used with insert whose seating area is either above or below the cutting edge surface.

Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.

In one embodiment  a holder (1) for clamping a cutting insert (2) comprising a screw hole (3) extending from a front face (5) to a back face (6) of the holder; wherein the holder is characterized in that a pivot (7) configured at top end of the back face (6) of the holder (1); a bottom face (8) of the holder (1) is configured as a contact surface (9) and a non-contact surface (10)  wherein said contact surface (9) makes contact with the cutting insert (2) for clamping the cutting insert (2).

In one embodiment  the front face (5) is configured into curved surface extending from a top end (11) to a bottom end (12) of the holder (1).

In one embodiment  the back face (6) is configured into a flat surface perpendicular to the contact surface (9).

In one embodiment  the non-contact surface (10) is divided into a first part non-contact surface (10a) and a second part non-contact surface (10b).

In one embodiment  the first part non-contact surface (10a) is at an angle (a) ranging from about 5 degrees to about 25 degrees with respect to the contact surface (9).

In one embodiment  the second part non-contact surface (10b) is at an angle (ß) ranging from5 degrees to about 25 degrees with respect to the contact surface (9).

In one embodiment  the holder (1) is capable of holding the cutting insert (2) having either a top seating surface or a bottom seating surface.

The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects  embodiments  and features described above  further aspects  embodiments  and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The novel features and characteristic of the disclosure are set forth in the appended claims. The disclosure itself  however  as well as a preferred mode of use  further objectives and advantages thereof  will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described  by way of example only  with reference to the accompanying figures wherein like reference numerals represent like elements and in which:

FIG. 1 shows perspective view of holder/wedge according to the prior art.
FIG. 2 shows side view of the holder/wedge according to the prior art.
FIG. 3 shows perspective view of the holder/wedge clamping cutting insert according to the prior art.
FIG. 4 shows perspective view of the holder according to the disclosure.
FIG. 5 shows side view of the holder according to the disclosure.
FIG. 6 shows side view of the holder clamping the cutting insert according to the disclosure.

DETAILED DESCRIPTION
The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure  both as to its organization and method of operation  together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood  however  that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the disclosure.

It is to be noted at this point that all of the components  whether alone or in any combination  are claimed as being essential to the invention  in particular the details depicted in the drawings and reference numerals in the drawings are as given below.

Referral Numerals:

Referral
numeral Description
1l Holder according to prior art
2l Cutting insert clamped using holder of prior art
1 Holder according to disclosure
2 Cutting insert clamped using the Holder according to the disclosure
3 Screw hole
4 Curved surface of the holder
4a Chamfer at top end of the holder
5 Front face of the holder
6 Back face of the holder
7 Pivot
8 Bottom face
9 Contact surface
10 Non-contact surface
10a First part non-contact surface
10b Second part non-contact surface
11 Top end of the holder
12 Bottom end
13 Milling cutter
a Angle made by first part non-contact surface with respect to contact surface
ß Angle made by second part non-contact surface with respect to contact surface
FIGS. 4 and 5 illustrate perspective view and side view of the holder (1) respectively according to the disclosure. The holder (1) is used for clamping the cutting insert (2). The holder (1) consists of a screw hole (3) extending from a front face (5) to a back face (6). A pivot (7) is provided at top end of the back face (6). The pivot (7) is an integral part of the holder (1)  i.e. by shaping the back face (6) of the holder (1)  the pivot (7) is provided. The said pivot (7) facilitates the holder (1) in rotating about the pivot in an arc. The bottom face (8) is characterized in to a contact surface (9) and a non-contact surface (10). The said contact surface (9) makes contact with the cutting insert (2) for clamping the cutting insert (2)  and the said non-contact surface doesn’t make contact with the cutting insert (2) and thus prevent the chipping off of the cutting edges of the cutting insert (2) during assembling/clamping  disassembling and indexing.

The front face (5) of the holder (1) is characterized into a curved surface (4) extending from a top end (11) to the bottom end (12) of the holder (1). Also  a chamfer (4a) is provided at top end (11) of the holder (1) to avoid sharp edges in the holder (1). The back face (6) is characterized in to a flat surface. The non-contact surface (10) is characterized in to a first part non-contact surface (10a) and a second part non-contact surface (10b). The first part non-contact surface (10a) is provided with a clearance from the bottom surface at an angle (a) ranging from about 5 degrees to about 25 degrees. The second part non-contact surface (10b) is provided with a clearance from the bottom surface at an angle (ß) ranging from 5 degrees to about 25 degrees with respect to the contact surface (9). Thus the non-contact surface (10) is not in contact with the cutting insert (2) and is not seated into the seating surface of the cutting insert (2). Thus  the non contact surface is provided for relief. Along with the non contact surface  the movement of the wedge/holder in an arc prevents the chipping of insert cutting edges.

In addition  as the holder’s (1) front end is to be used for clamping  the holder (1) can be used for clamping any cutting insert having top seating surface or the bottom seating surface.

FIG. 6 illustrates side view of the holder (1) for clamping the cutting insert (2) according to the disclosure. The holder/wedge (1) moves in an arc about the pivot (7) during clamping and unclamping. The holder (1) is assembled into the pocket (not shown) provided in the milling cutter (13) [not shown] for clamping the cutting/milling inserts (2). During indexing the screw connected to the milling cutter (13) is removed or partially removed and the insert (2) is indexed for using the other cutting edge of the insert. The clearance provided by the holder (1) helps in indexing the cutting insert without chipping off of the cutting edges which may happen during indexing.

Advantages
The holder/wedge is used for cutting inserts having seating area is either above or below the cutting edge.

The pivot provided facilitates the movement of the holder in an arc for indexing.

The holder/wedge prevents the chipping of insert cutting edges during clamping and unclamping of insert.

Equivalents
With respect to the use of substantially any plural and/or singular terms herein  those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.

It will be understood by those within the art that  in general  terms used herein  and especially in the appended claims (e.g.  bodies of the appended claims) are generally intended as “open” terms (e.g.  the term “including” should be interpreted as “including but not limited to ” the term “having” should be interpreted as “having at least ” the term “includes” should be interpreted as “includes but is not limited to ” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended  such an intent will be explicitly recited in the claim  and in the absence of such recitation no such intent is present. For example  as an aid to understanding  the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However  the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation  even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g.  “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition  even if a specific number of an introduced claim recitation is explicitly recited  those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g.  the bare recitation of “two recitations ” without other modifiers  typically means at least two recitations  or two or more recitations). Furthermore  in those instances where a convention analogous to “at least one of A  B  and C  etc.” is used  in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g.  “a system having at least one of A  B  and C” would include but not be limited to systems that have A alone  B alone  C alone  A and B together  A and C together  B and C together  and/or A  B  and C together  etc.). In those instances where a convention analogous to “at least one of A  B  or C  etc.” is used  in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g.  “a system having at least one of A  B  or C” would include but not be limited to systems that have A alone  B alone  C alone  A and B together  A and C together  B and C together  and/or A  B  and C together  etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms  whether in the description  claims  or drawings  should be understood to contemplate the possibilities of including one of the terms  either of the terms  or both terms. For example  the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”

While various aspects and embodiments have been disclosed herein  other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting  with the true scope and spirit being indicated by the following claims.

We claim:
1. A holder (1) for clamping a cutting insert (2) comprising a screw hole (3) extending from a front face (5) to a back face (6) of the holder (1); wherein the holder (1) is characterized in that:
a pivot (7) configured at top end of the back face (6) of the holder (1);
a bottom face (8) of the holder (1) is configured in to contact surface (9) and non-contact surface (10)  wherein said contact surface (9) makes contact with the cutting insert (2) for clamping the cutting insert (2).

2. The holder (1) as claimed in claim 1  wherein the front face (5) is configured into curved surface extending from a top end (11) to a bottom end (12) of the holder (1).

3. The holder (1) as claimed in claim 1  wherein the back face (6) is configured into a flat surface perpendicular to the contact surface (9).

4. The holder (1) as claimed in claim 1  wherein the non-contact surface (10) is configured in to a first part non-contact surface (10a) and a second part non-contact surface (10b).

5. The holder (1) as claimed in claim 4  wherein the first part non-contact surface (10a) is at an angle (a) ranging from about 5 degrees to about 25 degrees with respect to the contact surface (9).

6. The holder (1) as claimed in claim 4  wherein the second part non-contact surface (10b) is at an angle (ß) ranging from 5 degrees to about 25 degrees with respect to the contact surface (9).

7. The holder (1) as claimed in claim 1  wherein the holder (1) is capable of holding the cutting insert (2) having either a top seating surface or a bottom seating surface.