US3916573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for grinding a gem stone
Assignee: HOGE RAAD VOOR DIAMANT
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Filing: 1975-03-12
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Granted: 1975-11-04
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Expires: 1995-03-12
Abstract
Abstract A gem stone to be ground is placed against a rotating grinding wheel, and thereupon the gem stone is turned relative to the grinding wheel until an ideal orientation has been determined for the gem stone relative to the grinding wheel. The frictional heating of the gem stone is measured in the region of contact of the same with the grinding wheel, and the contact pressure at which the gem stone contacts the grinding wheel is controlled as a function of the measured temperature and in such a manner as to maintain the temperature constant. The respective facets of the gem stone are thereupon ground with the grinding wheel.
Inventors
- 👤 Maximo Elbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:58
CPC Classifications
B; B24; B24B; B24B9/00; B24B9/02; B24B9/06; B24B9/16; B24B9/167
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
199 words
In a machine for grinding and polishing of gem stones, particularly diamonds, a combination comprising a grinding disc mounted for rotation in a substantially horizontal plane; a first upright mounted laterally of said grinding disc and being adjustable in vertical direction; a second upright paralleling said first upright and having a lower end located above said plane and said grinding disc and being adapted to carry a gem stone; connecting means connecting said second upright with said first upright for vertical movement of the former with reference to said plane; first drive means for turning said second upright about an upright axis intersecting said plane; second drive means for advancing said lower end toward and retracting it from said plane in upright direction, whereby to effect and terminate contact of said gem stone with said grinding disc; first sensing means for sensing the distance through which said lower end advances towards said plane in said upright direction; and thermally responsive second sensing means for sensing fluctuations in the temperature of the gem stone, and operatively associated with said second drive means for controlling operation of the same in such a manner that said temperature will become and remain constant.
Claim 2
Dependent Claim
199 words
In a machine for grinding and polishing of gem stones, particularly diamonds, a combination comprising a grinding disc mounted for rotation in a substantially horizontal plane; a first upright mounted laterally of said grinding disc and being adjustable in vertical direction; a second upright paralleling said first upright and having a lower end located above said plane and said grinding disc and being adapted to carry a gem stone; connecting means connecting said second upright with said first upright for vertical movement of the former with reference to said plane; first drive means for turning said second upright about an upright axis intersecting said plane; second drive means for advancing said lower end toward and retracting it from said plane in upright direction, whereby to effect and terminate contact of said gem stone with said grinding disc; first sensing means for sensing the distance through which said lower end advances towards said plane in said upright direction; and thermally responsive second sensing means for sensing fluctuations in the temperature of the gem stone, and operatively associated with said second drive means for controlling operation of the same in such a manner that said temperature will become and remain constant.
Claim 3
Dependent Claim
29 words
A combination as defined in claim 1, wherein said connecting means comprises suspension elements connecting said second upright with said first upright and forming a parallelogram with said uprights.
Claim 4
Dependent Claim
14 words
A combination as defined in claim 2, wherein said suspension elements are leaf springs.
Claim 5
Dependent Claim
29 words
A combination as defined in claim 1, wherein said second drive means comprises a motor, and a cam driven by said motor and operatively associated with said second upright.
Claim 6
Dependent Claim
20 words
A combinatioN as defined in claim 1, wherein said second sensing means comprises a resistor having a negative temperature coefficient.
Claim 7
Dependent Claim
20 words
A combination as defined in claim 1, wherein said second sensing means comprises a resistor having a positive temperature coefficient.
Claim 8
Dependent Claim
26 words
A combination as defined in claim 1, and further comprising heat-exchanger means for providing heat-exchange with the region where said gem stone contacts said grinding disc.
Claim 9
Dependent Claim
48 words
A combination as defined in claim 1, wherein said lower end of said second upright comprises holding means for said gem stone and for said second sensing means, and wherein said holding means is at least in part composed of material having a low coefficient of thermal conductivity.
Claim 10
Dependent Claim
186 words
In a machine for grinding and polishing of gem stones, particularly diamonds, a combination comprising a grinding disc mounted for rotation in a substantially horizontal plane; a first upright mounted laterally of said grinding disc and being adjustable in vertical direction; a second upright paralleling said first upright and having a lower end located above said plane and said grinding disc and being adapted to carry a gem stone; connecting means comprising suspension elements connecting said second upright with said first upright and forming a parallelogram with said uprights; first drive means for turning said second upright about an upright axis intersecting said plane; a rigid support attached to the first upright; second drive means for advancing said lower and toward and retracting it from said plane in upright direction, that second drive means are mounted on the rigid support; holding means for said gem stone attached to the lower end of the second upright wherein the holding means are rotable about the axis of the second upright and pivotable about a horizontal axis; a measure instrument for sensing the removing material from the gem stone.
Claim 11
Dependent Claim
186 words
In a machine for grinding and polishing of gem stones, particularly diamonds, a combination comprising a grinding disc mounted for rotation in a substantially horizontal plane; a first upright mounted laterally of said grinding disc and being adjustable in vertical direction; a second upright paralleling said first upright and having a lower end located above said plane and said grinding disc and being adapted to carry a gem stone; connecting means comprising suspension elements connecting said second upright with said first upright and forming a parallelogram with said uprights; first drive means for turning said second upright about an upright axis intersecting said plane; a rigid support attached to the first upright; second drive means for advancing said lower and toward and retracting it from said plane in upright direction, that second drive means are mounted on the rigid support; holding means for said gem stone attached to the lower end of the second upright wherein the holding means are rotable about the axis of the second upright and pivotable about a horizontal axis; a measure instrument for sensing the removing material from the gem stone.
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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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |