US Patent: 1,059,655
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| Center Stop for Machine Tools
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Patentee:
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| Edward P. Bullard, Jr. (exact or similar names) - Bridgeport, Fairfield County, CT |
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Patent Dates:
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| Applied: |
Sep. 20, 1911 |
| Granted: |
Apr. 22, 1913 |
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Joel Havens
"Vintage Machinery" entry for Bullard Machine Tool Co.
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Description: |
| This patent was listed on a Bullard Maxi-Mill patent plate.
Abstract:
This invention relates to improvements in boring mills, maxi-mills, vertical turret lathes, horizontal lathes, and the like, and refers particularly to what I term a center stop, that is, means whereby the cutting tool of the machine may be brought to the center and accurately set in relation to the center of the table spindle. In machines of this sort, having a rotary work carrying table, a turret head, slide, saddle and feed mechanism whereby the tool may be adjusted both vertically and horizontally, it is highly important that a definite, accurate and reliable center stop be provided whereby the tool carried by the head may be brought back to and set in the center, with relation to the table, at the beginning of each important operation, therefore it is the purpose of my invention to provide and construct such mechanism, so that the position of its successive settings will not vary, and further to provide said center stop for the main tool head of a machine, so that it may be shifted, if desired to permit the said head to be carried beyond the center a few inches on special occasions, and finally to construct the said mechanism in a unique manner so that it will not inherit the weakness and consequent inaccuracy of the present forms of center stops.
Claim:
A center stop for machine tools, comprising a cross rail, a feed screw mounted in the crossrail, a shouldered collar upon the feed screw, means adapted to be interposed between the collar of the feed screw and a fixed portion of the cross rail to stop the rotary movement of the screw. |
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