Patent US3811229A successfully refreshed from Google Patents.
US3811229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gem faceter
Assignee: Trane US Inc
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Filing: 1973-03-05
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Granted: 1974-05-21
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Expires: 1993-03-05
Abstract
Abstract A gem faceter comprising a pivot block which is vertically movable to various positions, a pivot arm pivotally mounted at one end to the pivot block, a head mounted to the other end of the pivot arm and adapted for movement to various positions about a pivot pin, a dop mounted in said head and adapted to be rotated about its axis to various positions, an index plate fixedly mounted on said dop and having markings thereon which indicate the number and position of desired facets to be ground on a gem held by the dop, an index plate clamp for locking the index plate successively in said desired marked positions relative to the head for grinding the desired facets, a lapping table adapted to be contacted by the dopped gem, a protractor for continuously indicating the angular position of the dop relative to the vertical, an adjustable stop for limiting the movement of the head toward the lapping table, a sensor mounted on the stop for sensing the degree of movement of the head toward the lapping table, an electronic circuit for translating the degree of movement sensed by the sensor into an electronic signal, and a visual indicator for indicating the value of the electronic signal and the degree of said movement, whereby the faceting angle may be detected and duplicated with great precision.
Inventors
- 👤 E Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:05
CPC Classifications
B; B24; B24B; B24B9/00; B24B9/02; B24B9/06; B24B9/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
145 words
A gem faceter comprising a base, a vertical post mounted in said base, means for moving said post to various vertical positions and locking it in place, a pivot block mounted on said post and movable vertically therewith, a pivot arm having one end pivotally mounted to the pivot block, a head pivotally mounted on the other end of the pivot arm, a dop rotatably mounted in said head, index plate means fixedly mounted on said dop for rotatively positioning said dop to grind desired facets on a gem held by said dop, index plate locking means for holding the index plate means and dop in desired positions relative to said head for grinding the desired facets, a lapping table adapted to be contacted by the gem mounted on said dop, and means for indicating the angular position of the dop relative to the vertical.
Claim 2
Dependent Claim
145 words
A gem faceter comprising a base, a vertical post mounted in said base, means for moving said post to various vertical positions and locking it in place, a pivot block mounted on said post and movable vertically therewith, a pivot arm having one end pivotally mounted to the pivot block, a head pivotally mounted on the other end of the pivot arm, a dop rotatably mounted in said head, index plate means fixedly mounted on said dop for rotatively positioning said dop to grind desired facets on a gem held by said dop, index plate locking means for holding the index plate means and dop in desired positions relative to said head for grinding the desired facets, a lapping table adapted to be contacted by the gem mounted on said dop, and means for indicating the angular position of the dop relative to the vertical.
Claim 3
Dependent Claim
22 words
The gem faceter of claim 1 including adjustable stop means for limiting the movement of said head around a horizontally positioned pivot.
Claim 4
Dependent Claim
28 words
The gem faceter of claim 2 including micrometer sensing means mounted on said stop means for sensing the degree of movement of a gem mounted on said dop.
Claim 5
Dependent Claim
51 words
The gem faceter of claim 3 including means for translating said degree of movement sensed by the sensing means into an electronic signal, and visual means adapted to receive the electronic signal and visually indicate its value, whereby the depth of the facet may be detected and duplicated with great precision.
Claim 6
Dependent Claim
51 words
The gem faceter of claim 1, said index plate means including an indicator plate in the form of a disk attached to the dop, and a number of notches formed in the perimeter of the index plate, said notches being programmed so as to grind facets of desired number and position.
Claim 7
Dependent Claim
19 words
The faceter of claim 1, including protractor means which indicates the angle of the dop relative to the vertical.
Claim 8
Dependent Claim
124 words
The gem faceter of claim 6, said protractor means including a pulley fixedly mounted on said pivot block, a head pulley freely mounted on a shaft extending between the head and the pivot arm, a protractor with angle indicating markings fixedly mounted on the head pulley, a pointer fixedly mounted on the head and adapted to point to the protractor markings to indicate the angle between the dop and the vertical, and a cable trained around said pulleys whereby movement of the dop and pivot arm about the pivot block pivot pin causes relative movement of the protractor to maintain its attitude in space, whereby the position of the pointer against the protractor markings continuously indicates the angle between the dop and the vertical.
Claim 9
Dependent Claim
79 words
The gem faceter of claim 1 including counterweight means mounted on the pivot arm and having a first position for making the head and dop lighter and easier to handle, stop means for holding the pivot arm in said first position, a second position wherein its weight bears against the gem to hold it in contact with the lapping table to assist in polishing the gem automatically, and stop means for holding the pivot arm in said second position.
Claim 10
Dependent Claim
27 words
The gem faceter of claim 1 including angle compensator means for adjusting the rotative position of said index plate means without unlocking said index plate locking means.
Claim 11
Dependent Claim
63 words
The gem faceter of claim 1 wherein said angle compensator means includes an adjustment block pivotally mounted on said head and connected to said index plate means, adjustment screw means threaded through said adjustment block for rotating said adjustment block and index plate means in one direction, and spring means pressing against said adjustment block and urging rotation thereof in the opposite direction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |