US Patent: 411,620
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| Lathe-dog
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Patentee:
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| Charles W. Shartle (exact or similar names) - Middletown, OH |
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Patent Dates:
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| Applied: |
Apr. 08, 1889 |
| Granted: |
Sep. 24, 1889 |
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Jeff Joslin
Vintage Machinery entry for Middletown Machine Co.
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Description: |
| This lathe dog has a work-holding jaw that pivots to bite into the work under cutting force; this enables the set-screws to be thumbscrews as they do not need to be very tight to prevent the work from moving in the dog.The 1889-08-29 American Machinist, page 3, has an illustrated article on this patent lathe dog. The manufacturer is identified as the "Middletown Machine Works" of Middletown. The 1897 catalog of machinery supplier Charles Besly & Co. features "Shartle's Bull Dog" lathe dogs on page 84; the dog shown matches the patent except that it has square-head set-screws rather than thumb screws. The November 1902 Modern Machinery, page 153, has an illustrated writeup on a split lathe-dog for axles that appears to be a descendant of this design; it was manufactured by the Shartle Brothers Machine Co. of Middletown (the Middletown Machine Co. having since switched its exclusive focus to gasoline engines). |
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