Cutters – for shaping – Including holder having seat for inserted tool – With separate means to fasten tool to holder
Patent
1981-08-11
1983-12-13
Bray, W. D.
Cutters, for shaping
Including holder having seat for inserted tool
With separate means to fasten tool to holder
407 40, 407 48, 407 98, B26D 100
Patent
active
044202806
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a tool block with a cutting insert holder positioned in the tool block, which holder is provided with a cutting insert.
An object of this invention is to design the tool block in such a way that cutting insert exchange and indexing of cutting inserts are considerably simplified.
SUMMARY OF THE INVENTION
In accordance with the present invention, an insert holder is movable on a tool holder between insert clamping and insert non-clamping positions. A lever is biased in one direction to forcefully urge the holder toward a clamping position. The bias on the lever can be released to enable the holder to be moved to the insert non-clamping position, preferably by means of a spring which pushes against the holder.
BRIEF DESCRIPTION OF THE DRAWING
A preferred embodiment of the invention shall be more closely described in connection to the accompanying drawing which is a sectional view taken through a tool block, depicting an insert holder in an insert-clamping position.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
The tool block disclosed in the drawing comprises a longish holding body 10 in which is made a cavity 11 oriented in the longitudinal direction of the holding body 10, in which cavity a cutting insert holder 12 is movably arranged against the action of a spring 13. A cutting insert 14 provided with an aperture is positioned on a locking pin 15 mounted on and projecting from the insert receiving-site of the cutting insert holder 12. The bottom support surface for the cutting insert 14 is, as usual, formed by a separate support plate 16 of the same form as the cutting insert, while the back support for the cutting insert is formed by a stop 17 positioned on the stationary part of the tool block. The support plate 16 is received in a recess of the insert holder 12 and is secured to the latter by the pin 15 which extends through the support plate 16 and the cutting insert 14 such that the insert holder 12, the pin 15, the insert 14, and the support plate 16 are movable as a unit relative to the recess 11.
The cutting insert holder 12 is formed with a recess 18 in which a slide 19 arranged substantially parallel with the locking pin 15 shall be positioned. The recess 18 in section has the form of a parallel trapezoid, the beveled surface of which is the stop surface for the slide 19. In this connection the stop surface of the slide 19 is also beveled in order better to be able to cooperate with the beveled surface of the recess 18. For influence upon the slide there is arranged a lever 20, one end of which acts upon the slide 19, while the other end of which cooperates with a plunger 21 of a pressure-cylinder 24, which is positioned in a cavity 23 oriented substantially parallel with the locking pin 15 in the tool block. In this connection the under-side of the plunger 21 is under the biasing influence of a spring device 22.
The lever 20 is pivotally positioned on an axis 25, which is fixed in the tool block, which axis is perpendicularly directed to the centre line of the cylinder 24. The two ends of the lever 20 are unattachedly resting against the slide 19 respectively a pin 26 projecting from the plunger 21.
When loosening the cutting insert 14 a pressure medium, for instance air, is from a suitable source (e.g., a conventional pump 27) forced into the cylinder on the upper side of the plunger 21, via a passage 28 whereby the plunger 21 retracted downwards is against the action of the spring 22. In this connection the pressure of the lever 20 on the slide 19 is reduced, whereby the spring 13 can force out the cutting insert holder 12. In this connection there is formed a gap between the back edge of the cutting insert 14 and the support 17, which is enough in order to be able to remove the cutting insert 14 from its insert receiving site.
After the exchange or indexing of the cutting insert the pressure in the cylinder 24 is removed, whereby the plunger 21 is forced upwards by the action of the spring 22. In this connection
REFERENCES:
patent: 3838500 (1974-10-01), Wirfelt
patent: 3981607 (1976-09-01), Jorgensen
patent: 4321846 (1982-03-01), Neamtu
patent: 4364693 (1982-12-01), Lindsay
Bray W. D.
Seco Tools Aktiebolag
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