toolholder

Details toolholder toolholder

1999-05-12

2001-01-23

Wellington, A. L. (Department: 3722)

Cutters, for shaping

Including holder having seat for inserted tool

With separate means to fasten tool to holder

C407S002000, C407S117000

Reexamination Certificate

active

06176649

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to toolholders for releasably receiving one or more cutting inserts.
BACKGROUND OF THE INVENTION
In U.S. Pat. No. 4,580,930 to Zinner, there is illustrated and described a toolholder having a rigid base jaw and a tapering clamping jaw defining a longitudinally extending insert receiving slot for releasably receiving a cutting insert which is clamped therein by a clamping force transversely directed to its major clamping surfaces. Irrespective of how tightly a cutting insert is clamped in an insert receiving slot, it can be undesirably and forcibly extracted therefrom during a cutting operation by outwardly directed unseating forces acting co-directional with the slot. To prevent such unseating, the toolholder is provided with a stopping member (
28
) received in a recess (
27
) formed in the cutting insert's lower clamping surface (see FIG.
12
). However, this complicates the toolholder's construction and requires suitably formed cutting inserts.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a toolholder for clamping a cutting insert, the toolholder comprising:
a rigid base jaw,
an upper clamping jaw tapering towards a leading nose portion,
said base jaw and said clamping jaw defining therebetween a longitudinally extending insert receiving slot for releasably receiving the cutting insert in a predetermined position,
a stopping member for engaging an auxiliary clamping surface of the cutting insert to prevent its outward longitudinal displacement from said predetermined position during a cutting operation,
characterized in that
said stopping member being constituted by said leading nose portion so shaped and dimensioned to initially urge the cutting insert to said predetermined position prior to its clamping in said insert receiving slot.
In accordance with the present invention, a clamping jaw's leading nose portion initially urges a cutting insert inward to its predetermined position in an insert receiving slot prior to its otherwise conventional clamping and thereafter it reacts against the outwardly directed unseating forces prevailing during a cutting operation to positively secure the cutting insert in its predetermined position. Such clamping necessarily involves elastic deformation of substantially the entire clamping jaw which in turn entails that its leading nose portion also undergoes elastic deformation from an initial unclamping state to a final clamping state.
By virtue of the present invention, the proposed modification to an otherwise conventional toolholder facilitates the secure clamping of preferably conventional double ended cutting inserts. In addition, the proposed modification to an otherwise conventional toolholder can be readily implemented.


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