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Title: |
1871 Article-Rollstone Machine Works, White's Patent Lathe Dog |
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Source: |
American Artisan, V13, 19 Jul 1871, pg. 40 |
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Insert Date: |
2/14/2021 8:52:20 PM |
In turning small round stuff, chair-legs, rounds, and the like, in wood-turning lathes, it is customary to attach one end of the stick in position by forcing it against a mandrel-dog having radial teeth that sink into the wood and hold it fast or cause it to be held fast between the dog and the back center, stick, of course, turning with the rotation of the mandrel-dog. It is very commonly found that these radial teeth with the ordinary dog split the wood, especially when the latter is turned down close to them. To obviate this Mr. Henry K. White, of Chelsea, Mass., has devised the improvement illustrated in the accompanying engraving, and which was patented March 18, 1871. Fig. 1 is a side view and partial section, and Fig. 2 an end view of the device.
The dog-stock is made with an encompassing sleeve or tube, d, which has an internal screw-thread works upon an external thread, f, on the stock, a, the front end of this tube, being made sharp, as at g, so that, when fed up into the plane of the ends of the dog-teeth, b, or slightly projecting beyond them, the said edge shall strike into the end of the stick to be turned, thereby holding the material, into which the teeth enter, and effectually preventing it from splitting, although the turning tool may cut down to the tube. The secure retention of the sleeve with its edge, g, in proper relation to the plane of the teeth, b, is attained by a check nut, h, just in rear of the sleeve. The operation of the device is obvious. The annular sharp of the sleeve confines the wood while acted upon by the radial teeth, and thereby wholly nullifies the tendency of said teeth to split the wood, as frequently occurs with the devices originally in use for like purposes. These lathe-dogs are manufactured for sale by the Rollstone Machine Works, Fitchburg, Mass.
US Patent: 112,759
http://datamp.org/patents/displayPatent.php?number=112759&typeCode=0 |
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1871 Rollstone Machine Works, White's Patent Lathe Dog
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