Cutters – for shaping – Rotary cutting tool – Including holder having seat for inserted tool
Reexamination Certificate
1999-03-19
2001-02-06
Tsai, Henry (Department: 3722)
Cutters, for shaping
Rotary cutting tool
Including holder having seat for inserted tool
C407S056000, C407S101000, C407S102000, C299S109000
Reexamination Certificate
active
06183170
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a cylindrical cutting device, and more particularly to a cutting machine or a line milling machine in which a chisel holder or like tool is removably secured to a base carried on the machine.
As a rule, such cutting devices have a plurality of bases disposed on their surface at a uniform spacing, and form, for example, a broach-loading screw or a broach spiral. In this connection, a chisel holder with an exchangeable chisel is connected to each base or, in some bases, an appropriately fitting chisel is inserted directly without having a chisel holder as an intermediate element.
A known cutting device of this type is disclosed for example in DE 43 22 402 C2. In the disclosed device, a chisel holder includes a shaft which is introduced into a plug-in receptacle of a base, and is referred to as a plug-in attachment. To prevent the chisel holder from being pulled out, the chisel holder is secured in the base with a setscrew, which can be actuated by means of a recessed hexagonally shaped tool receptacle and which setscrew engages an assigned recess of the shaft of the chisel holder.
The above method of securing the chisel holder has a disadvantage in that an internal thread of a borehole which extends through the base, and the hexagonal recess of the setscrew which serves to accommodate a tool, are susceptible to contamination especially when a cutting operation of the cutting device creates an abundant amount of dust. As a consequence, it becomes increasingly difficult to loosen the setscrew in order to exchange the chisel holder.
The present invention is therefore concerned with the problem of providing a cutting device of the above type, for which the chisel holder or holders, or like tools, are secured in a simple manner not susceptible to contamination and, accordingly, can be loosened easily when required.
SUMMARY OF THE INVENTION
In accordance with these and other objects of the invention, there is provided a cylindrical cutting device which includes at least one base mount disposed on a surface thereof. A borehole is formed extending through the base mount, in which a securing bolt is receivable. A chisel holder is provided for exchangeable securement to the basc mount. A recess is formed in the chisel holder such that, when the securing bolt is inserted in the borehole, a portion of the securing bolt at least regionally engages the recess, preventing separation of the chisel holder from the base mount. The securing bolt is detachably secured to the base mount by a press-fitting or other locking structure in a manner advantageously avoiding the use of threads.
By virtue of the fact that the securing bolt is not constructed as a setscrew, pursuant to the present invention, it is held without threads by being jammed or locked in the borehole formed in the base mount. As a result, there are no threads which are subject to contamination in the base mount and, with that, there is also no danger that such threads will be clogged with foreign objects and make it difficult to loosen and exchange the chisel holder.
The above, and other objects, features and advantages of the present invention will become apparent from the following description read in conjunction with the accompanying drawings, in which like reference numerals designate the same elements.
REFERENCES:
patent: 530793 (1894-12-01), Odgers
patent: 2965365 (1960-12-01), Krekeler
patent: 3092374 (1963-06-01), Krekeler
patent: 3285668 (1966-11-01), Fearon
patent: 3575467 (1971-04-01), Davis
patent: 4057294 (1977-11-01), Krekeler
patent: 4337980 (1982-07-01), Krekeler
patent: 4322402 (1996-06-01), None
Heiderich Ernst
Stuckardt Martina
Wald Wolfgang
Walter Reinhold
Boart Longyear GmbH & Co. KG Hartmetallwerkzeugfabrik
Jordan and Hamburg LLP
Tsai Henry
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