Holding device for machine tool inserts

Details Holding device for machine tool inserts Holding device for machine tool inserts

2000-02-08

2001-06-05

Tsai, Henry (Department: 3722)

Cutters, for shaping

Including holder having seat for inserted tool

With separate means to fasten tool to holder

C407S102000, C407S117000

Reexamination Certificate

active

06241429

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a holding device for machine tool inserts, especially for piercing or cutting inserts. A clamping girder-like cutting tool carrier has a recess formed in the end of the carrier, where a clamping seat delimited by clamping jaws on the cutting tool carrier is formed to receive the inserts. A slot extends from the interior end of the recess as an extension of the recess, and includes a receptacle in which a spreading body is held and provided as part of a spreader key. The spreading body has a non-circular cross-sectional profile and is able to be rotated for the spreading of the slot, and thus, the enlargement of the unobstructed opening of the clamping seat.
BACKGROUND OF THE INVENTION
A holding device for machine tools is disclosed in DE 39 06 822 C3 (corresponding to U.S. Pat. No. 5,035,545). With this conventional holding device, a spreading key is provided having spreading body with an elliptical cross-sectional profile. The receptacle for the spreading body in the slot of the cutting tool carrier has two recesses facing one another in the edges of the slot. The recesses correspond to the two small apex curvature circles of the elliptical cross-sectional profile outline of the spreading body. Due to the precise correspondence of the relevant apex curvature circles required for safe and secure functioning of the known holding device, the spreader key and the cutting tool carrier are costly to manufacture. This costly manufacture is a drawback, and is required principally because of the narrow manufacturing tolerances which need to be maintained to attain the precise correspondence.
SUMMARY OF THE INVENTION
Objects of the present invention are to provide a holding device for machine tool inserts which can be manufactured in an especially simple manner, and thus, is characterized by comparatively low manufacturing costs.
For a holding device for machine tool inserts, these objects are attained according to the present invention by the slot, serving as a receptacle for the spreading body, being an approximately semicircular expansion in one of its two longitudinal edges and by a polygonal profile outline, serving as the cross-sectional profile outline of the spreading body of the spreader key, being in the form of an isosceles triangle. The corners of the triangle are rounded with identical radii of curvature smaller than the radius of the expansion of the slot.
The semicircular expansion of the slot forming the receptacle for the spreading body is quite simple to manufacture in terms of manufacturing technology. Also, the radius of the expansion relative to the curve radius of the rounded corners of the polygonal outline of the spreading body need not be held or made with narrow tolerances.
The spreading occurs by a 60° rotation of the spreading body into a rotary setting in which two rounded corner areas of the polygonal profile outline are aligned within the semicircular expansion and the third rounded corner area is supported with its apex on the facing edge of the slot. In this rotary setting, in which the clamping seat for receiving the tool inserts is opened, the spreading body is located in the receiving area in the slot in automatically locking alignment, so that the operator need not grasp it tightly when the clamping seat is opened for the exchange of inserts.
An especially secure automatic locking is obtained simply by arranging the location of the spreading body in the exemplary embodiments in such a manner that the edge of the slot lying opposite the semicircular expansion includes a slight depression.
Other objects, advantages and salient features of the present invention will become apparent form the following detailed description, which, taken in conjunction with the annexed drawings, discloses a preferred embodiment of the present invention.


REFERENCES:
patent: 4357123 (1982-11-01), Zweekly
patent: 5035545 (1991-07-01), Zinner
patent: 5803675 (1998-09-01), Von Haas
patent: 0385 495 (1990-09-01), None
patent: 95/13892 (1995-03-01), None

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