US Patent: 292,676
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| Jeweling Tool
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Patentee:
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| James R. Parsons (exact or similar names) - La Porte, La Porte County, IN |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 10, 1883 |
| Granted: |
Jan. 29, 1884 |
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Joel Havens
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Description: |
| Jason L. Ewin - patent attorney
Claim:
This invention relates to watchmakers tools or devices for jeweling watches and fitting screw-heads, arbors, and the like, which operations demand the utmost accuracy and uniformity of result, while at the same time it is desirable to perform them as expeditiously as possible, and without the aid of complicated apparatus. Heretofore various tools and devices for this work have been made and used, including what are termed caliper-rests for watchmakers lathes. The latter are very expensive in their construction, and for this reason many jewelers cannot afford to use them; otherwise they are all that could be desired, except in the direction of` simplicity. The caliper principle, which distinguishes the devices last named and is the quality which renders their work correct and satisfactory, is the basis of my present invention. Said principle may be said to consist in the use of the jewel, screw-head, or arbor end, which is to be fitted as a gage by which to determine with the utmost exactness the diameter of the seat or pivot-hole cut for its reception: The cutting-bit or cutter is arranged parallel to the axis of the pivot on which the caliper-jaws open, and is attached to one of said jaws,or the part which carries the same, with its point exactly midway between said pivot and the head of said jaws, or the jaws proper within which the jewel screw-head or arbor is grasped. Owing to this location of the cutting-point itA is moved from its normal position at the center of motion a distance equal lto one-half of the diameter of the jewel, screw head, or arbor end, accommodated by the opening of the jaws, and consequently the length of its lateral movement equals exactly the radius of the jewel, screw-head, or arbor end, and the circle which it describes is identical in diameter with that of the latter.
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