US Patent: 2,405,748
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| Internal Grinder
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Patentee:
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| William Johnson (exact or similar names) - Muskegon Heights, MI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Oct. 18, 1944 |
| Granted: |
Aug. 13, 1946 |
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Joel Havens
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Description: |
| Liverance and Van Antwerp - patent attorneys
This invention relates to a novel construction of internal grinder. It is desirable in many cases to grind relatively small holes through pieces of material to exact size. This grinding operation is usually performed on hardened material and after a hole of approximate size has previously been provided. The present invention is directed to a very efficient and relatively simple internal grinder which may be applied to the vertical spindle of a drill press or similar machine, the part having the cylindrical hole therein to be ground being fixed to the bed of the machine, and the internal grinder as a unit moved up and down vertically so that the grinding wheel may traverse the hole which is being ground. The construction which I have devised for this purpose is sturdy, efficient and accurate in operation, is readily adjusted for holes of different diameters and is in general simple, effective, durable, easily applied and removed and one with which the desired grinding operation may be very rapidly performed.
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