Cutting tool

Details Cutting tool Cutting tool

2002-07-29

2003-07-29

Fridie, Jr., Willmon (Department: 3722)

Cutters, for shaping

Including holder having seat for inserted tool

With separate means to fasten tool to holder

C407S104000, C407S105000

Reexamination Certificate

active

06599060

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a cutting tool having a cutting insert retained in an insert receiving pocket by means of a clamping pin. More particularly, the clamping pin is actuated by means of a clamping screw engaged in a side face of the cutting tool.
BACKGROUND OF THE INVENTION
Cutting tools having a cutting insert retained in an insert receiving pocket by means of a clamping pin are known. Such a tool is shown, for example, in U.S. Pat. No. 4,615,650 to Hunt. As shown in
FIGS. 4 and 5
of ‘650, a cutting insert
6
is retained in a recess
4
of a tool holder
2
. The cutting insert
6
is secured by passing a locking pin
8
through a cutting insert bore
10
. The locking pin
8
includes a first portion
28
dimensioned for insertion through the cutting insert bore
10
and a second adjacent portion
30
dimensioned for insertion into a first bore
22
of the tool holder. Engagement means include a pocket
58
′ which extends into the second portion
30
at an angle relative to the axis
56
′ and is defined by a wall
60
′ which is preferably cup-shaped. A drawing member
24
′ is in the form of a set pin having preferably a rounded end to bear against the cup-shaped wall
60
′.
When tightening the set pin it is urged against the wall
60
′ thereby pushing the locking pin
8
further into the first bore
22
so that the locking pressure is exerted in a first direction
36
downwardly on the front portion of the cutting insert bore
10
, and, in a second direction
44
rearwardly on the rear portion of the cutting insert bore
10
.
In the tool of ‘650, the set pin
24
′ is directed rearwardly with respect to the tool and is generally in the same plane as the locking pin
8
. Such an arrangement is not suitable when it is required to operate the clamping screw from a side face of the tool, that is, perpendicular to the view in
FIG. 5
of ‘650.
Another tool of the above kind is shown in Japanese Publication Number 11291105 A to Masayuki. As shown in ‘105, a crank pin
25
having a head
26
is inserted in both a body insertion hole
23
in a tool body
11
and an insertion hole
22
in a tip
15
mounted on a tip attachment seat
13
. An oblong hole
23
a
extends to an intersection of two side walls
13
b
,
13
c
of the tip attachment seat
13
so that it regulates a slanting direction of the crank pin
25
in the body insertion hole
23
. By pressing a cylindrical shaft
27
of the crank pin
25
by a fixed screw
30
, the crank pin
25
is pulled in so that it slants and the tip
15
is pressed and fixed to a bottom face
13
a
of the tip attachment seat
13
and the side walls
13
b
,
13
c
by means of the head
26
.
In the tool of ‘105, since the crank pin
25
passes through the tip
15
into the insertion hole
23
, it is necessary to dismantle the crank pin in order to replace the tip
15
. Also, in such an arrangement, the fixed screw
30
is generally directed in, or slanted with respect to, the direction of the plane in which the crank pin
25
moves. The fixed screw
30
cannot be perpendicular to the movement direction of the crank pin
25
and be separated therefrom if it is required to operate the fixed screw from such a direction.
Another tool of the above kind is shown in U.S. Pat. No. 3,491,421 to Holloway. As shown in
FIG. 8
of ‘421, a tool holder
10
C is provided with a bore
65
enlarged at
66
for providing a shoulder
67
between the two bores. A wobble pin
20
C has a lower tapering portion
70
having an inwardly arched groove
71
adjacent its lower end. A flange
72
is provided between the tapered shank portion
70
and an upwardly extending bulging end
24
C. The flange
72
is arched on its edge at
73
so as to be rockably mounted in the enlarged portion
66
. The wobble pin
20
C is held in place by a silicone rubber
74
that enters into the groove
71
.
The wobble pin
20
C is actuated by a push rod
59
having a front rounded end
61
and a rear bevel surface
60
. A screw
63
, having a tapered end
62
, pushes the push rod
59
onto the wobble pin
20
C, thereby pushing forwardly the lower tapering portion
70
. The tilting motion of the pin
20
C, enabled by the shoulder
67
that holds the flange
72
, moves rearwardly the bulging end
24
C thereby retaining rearwardly the cutting insert
30
against the side walls of its pocket.
A disadvantage of the tool of ‘421 is that the pin
20
C has to be held by a silicone rubber
74
so that it will not move upwardly by the pushing of the push rod
59
. Furthermore, the production of the tool with a bore with two portions of different diameters complicates the tool and increases its cost.
Another tool of the above kind is shown in British Patent No. 1 341 651. As shown in ‘651, a radially symmetrical clamping lever
3
forces a cutting plate
1
rearwardly against an upstanding shoulder
10
of a pocket in a shank
9
. The lever
3
, disposed in a cylindrical bore, comprises two conically tapered arms
4
and
6
so that its fulcrum
8
is intermediate its ends. A collar
5
is provided at the outer end of the lever arm
3
. The second lever arm
6
is provided in its outer end portion with a groove
7
. Since the clamping lever
3
is radially symmetrical, the groove
7
extends all around the clamping lever
3
. A clamping screw
14
extends parallel to the cylindrical bore at the shank. A wedge-shaped intermediate member
17
, having a cylindrical peripheral surface and an oblique wedge surface
18
, is pushed by the intermediate member
20
. A forward end
19
of the intermediate member
17
, that pushes forwardly the lever arm
6
, is ridged and extends into the groove
7
of the lever arm
6
so that the clamping lever
3
cannot fall out even when the clamping screw
14
is loose.
According to the construction of the clamping lever
3
, the forwardly pushing of the forward end
19
of the intermediate member
17
against the groove
7
causes a lever action around the fulcrum
8
thus urging rearwardly the cutting plate
1
by means of the collar
5
. A disadvantage of the tool of ‘651 is that the cutting plate
1
is urged only rearwardly and it cannot be urged downwardly against the bottom of the pocket in the shank
9
.
It is an object of the present invention to provide a cutting tool that significantly reduces or overcomes the aforementioned disadvantages.
SUMMARY OF THE INVENTION
In accordance with the present invention there is provided a cutting tool comprising a holder and a cutting insert, having a first through bore, mounted in an insert receiving pocket of the holder, the insert receiving pocket has a base wall and at least one side wall, a second bore of the holder extends downwardly from the base wall, a third bore of the holder extends rearwardly from the second bore and opens into a fourth bore of the holder, the fourth bore is slanted at a first slant angle (&agr;) with respect to the third bore;
a locking pin inserted in the second bore protrudes upwardly into the first through bore, the locking pin has an upper portion and a lower portion having a front side and a rear side, a protrusion extends rearwardly from the upper portion, the lower portion has a rearwardly facing groove that is substantially co-aligned with the third bore, a forward end of the groove is substantially closer to the front side of the lower portion than to the rear side of the lower portion;
a plunger received in the third bore, a forward portion of the plunger protrudes forwardly into the second bore and is in contact engagement with a forward portion of the groove, a rear portion of the plunger protrudes rearwardly into the fourth bore and has a first engagement surface transversely directed to a first axis (A) of the plunger;
a clamping member engaged in the fourth bore, the clamping member has a second engagement surface in contact engagement with the first engagement surface;
in a first position of the cutting tool, the protrusion of the locking pin is spaced forwardly from a retaining portion at a rear portion of

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