US Patent: 2,527,978
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| Cutting Tool
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Patentee:
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| George Wood (exact or similar names) - Battle Creek, Calhoun County, MI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Dec. 19, 1946 |
| Granted: |
Oct. 31, 1950 |
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Joel Havens
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Description: |
| Claim:
In the past many forms of cutting tools have been proposed for use in machine shops, and among these have been various types of tool bits and holders for same. One of the most common of these is the Armstrong which is the combination of a specially ground cutting edge, square section, tool bit with its holder which is adapted for mounting on a tool post or the like. The cutting end of those tool bits projects out a considerable distance beyond the end of the tool holder, and in order to properly grind it for efficient operation, the services of a specialized tool grinding employee, using special grinding equipment, is required. That type of construction does not permit the use of tool bits made solely of long wearing, hard, brittle material, such as cemented carbide, since tool bits of that type have relatively low tensile strength, and need solid support below the cutting edge to prevent excessive breakage. In order to overcome this breakage, highly specialized cutting tool assemblies involving bits having a cemented carbide cutting portion mounted on an adjustable corrugated steel base member, with a corresponding holder mounting, have been proposed, and while these are very promising, in actual practice they have been very difficult to construct as well as properly grind for efficient use. The hot and elongated spiral shavings produced during cutting operations have also been hazardous and have caused trouble. As a result of this a few chip breakers have been designed to overcome the hazard involved, and same in turn have generally been either made adjustable or as separate attachments to be mounted on the tool .holder, both of which make the chip breaker relatively expensive and liable to get out of order or be mislaid so as to be unavailable when wanted. It was a recognition of the difficulties and shortcomings of the prior art in this field which led to the conception and ultimate development of the present invention. |
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