US Patent: 234,517
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| Bit-stock
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Patentee:
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| Quimby S. Backus (exact or similar names) - Winchendon, MA |
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Patent Dates:
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| Applied: |
Sep. 29, 1880 |
| Granted: |
Nov. 16, 1880 |
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Patent Pictures:
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George Langford
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Description: |
| "This invention relates to that class of bit-braces in which the shank of the bit is held by jaws embracing its sides, while its end is received into and steadied by a socket formed in the body of socket-piece of the bit-holder, the object being to so attach the jaws to the socket-piece that while their freedom of movement in a lateral direction is maintained, they will be prevented from moving longitudinally when the bit is withdrawn or at other times; and the invention consists in forming the grooves of the bit-holder in which the jaws are placed with fulcrum-points, upon which the jaws oscillate, and providing the lower ends of the latter with a nick or projection, which receives a corresponding nick or projection on one end of the springs attached to the socket-piece, and by which the jaws are operated and prevented from moving longitudinally..."An example is reported, labeled, "Q. S. Backus Patent Oct 19 & Nov 16 1880 Winchendon Mass". See also patent 233,464. |
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