US Patent: 2,181,023
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| Cutting Tool
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Patentee:
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| John B. Moore (exact or similar names) - North Chicago, Cook County, IL |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 08, 1937 |
| Granted: |
Nov. 21, 1939 |
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Joel Havens
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Description: |
| Claim:
This invention relates to cutting tools, and particularly to tools of the type used for metal turning and including a shank of steel, or similar or carrier of steel, the heat incident to use frequently causes unequal expansion which results in the formation of fine cracks in the bit. Moreover, the brazing of the bit to the shank, with or without an intermediate layer of other metal having a coefficient of expansion intermediate those of the bit and the carrier, presents a serious problem. If the braze is comparatively thin, so as to insure rigidity,particularly when a hard steel shank is used, the tendency of the bit to crack because of the difference in thermal expansion is increased. n the other hand, if the braze is too thick, or a shank of relatively soft steel is used, or an intermediate layer is used so that there are two brazed joints, between the bit hnd a shank of relatively soft steel, the braze tends to act as a cushion, and deformation and mushrooming of the tool results. |
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