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| Ives -
[Amidon] patent bit brace. Here's a brace that has two clearly defined and almost literally followed patents, separated by only a year, making the active period of patent protection about sixteen years. Charles Amidon's U.S. Patent 283,844 is the earlier one and also the most difficult to recognize, because the rotatable pawl is disk-shaped in the realized version, whereas Frank Pfleghar's U.S. Patent 175,151 in practice also has a disk-shaped pawl. William A. Ives' US Patent 195,373 chuck is a better design (longer threads) compared to the chuck on the later Ives-Pfleghar616. |
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