US3673742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lapidary machine
Assignee: Individual
•
Filing: 1970-10-30
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Granted: 1972-07-04
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Expires: 1990-10-30
Abstract
Abstract A lapidary machine adapted to produce cabochon shaped gem stones or the like; the machine having a powered rotary grinding wheel provided with a contoured in cross section annular grinding surface adapted to grind peripheries of cabochon shaped gem stones; a powered rotary dop holding shaft structure adapted rotatably to carry a dop supported gem stone in contact with said annular grinding surface; said shaft structure axially parallel to and laterally movable relative to the rotary axis of said grinding wheel, said shaft structure having a generally oval shaped cam thereon; a normally stationary idler roller having a periphery engagable by said cam and means for adjusting the position of the periphery of said idler roller in directions laterally relative to the rotary axis of said shaft structure in order to progressively cut peripheries of stones down and to produce cabochon shaped stones of various overall sizes.
Inventors
- 👤 Syril A Colbaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:11
CPC Classifications
B; B24; B24B; B24B9/00; B24B9/02; B24B9/06; B24B9/16; B24B9/163; B24B17/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
203 words
In a lapidary machine, the combination of: a frame; a power driven grinding wheel rotatably mounted thereon; said grinding wheel having a concave surface extending from, respectively, spaced points on the radial and peripheral faces of said wheel; a dop holding shaft structure having one end adapted to carry a dop and a stone thereon to be ground on said annular grinding surface; said dop holding shaft structure carrying a model cam; first means rotatably and movably mounting said dop holding shaft structure on said frame to move laterally relative to a rotary axis of said shaft structure and generally toward and away from said concave grinding surface; an idler roller engagable by said model cam; second means mounted on said frame and adjustably supporting said idler roller so as to move said idler roller in directions generally laterally relative to the axis of said shaft structure and toward and away from said model cam; power operated means for rotatably driving said shaft structure; and third means adapted for adjustably moving said first means in a direction parallel to the axis of said shaft structure and for moving it generally toward and away from said concave grinding surface and relative to said frame.
Claim 2
Dependent Claim
203 words
In a lapidary machine, the combination of: a frame; a power driven grinding wheel rotatably mounted thereon; said grinding wheel having a concave surface extending from, respectively, spaced points on the radial and peripheral faces of said wheel; a dop holding shaft structure having one end adapted to carry a dop and a stone thereon to be ground on said annular grinding surface; said dop holding shaft structure carrying a model cam; first means rotatably and movably mounting said dop holding shaft structure on said frame to move laterally relative to a rotary axis of said shaft structure and generally toward and away from said concave grinding surface; an idler roller engagable by said model cam; second means mounted on said frame and adjustably supporting said idler roller so as to move said idler roller in directions generally laterally relative to the axis of said shaft structure and toward and away from said model cam; power operated means for rotatably driving said shaft structure; and third means adapted for adjustably moving said first means in a direction parallel to the axis of said shaft structure and for moving it generally toward and away from said concave grinding surface and relative to said frame.
Claim 3
Dependent Claim
39 words
The invention as defined in claim 1 wherein said first means is pivoted on said frame on an axis disposed laterally relative to the axis of said shaft structure, said power opErated means being carried by said first means.
Claim 4
Dependent Claim
51 words
The invention as defined in claim 2 wherein an elongated cantilever counterbalance arm is carried by said first means, said arm extending generally in a direction laterally relative to said axis about which said first means is pivoted on said frame; and a counterbalance weight adjustably movable longitudinally along said arm.
Claim 5
Dependent Claim
29 words
The invention as defined in claim 1 wherein said shaft structure is provided with an adjustable jaw chuck adapted to hold a dop supporting shaft at said one end.
Claim 6
Dependent Claim
35 words
The invention as defined in claim 1 wherein said frame comprises a pan-shaped tray; and conduit means for directing liquid coolant material onto said concave grinding surface; and shroud means partially surrounding said grinding wheel.
Claim 7
Dependent Claim
54 words
The invention as defined in claim 5 wherein said shroud means is provided with an opening therein adapted to permit a dop shaft, at one end of said shaft structure, to pass through said opening to carry a stone, to be cut, into said shroud means and into contact with said concave grinding surface.
Claim 8
Dependent Claim
71 words
The invention as defined in claim 1 wherein a first carriage supports said first means and said idler and said second means, said first carriage means movable on said frame to carry said dop holding shaft structure and said idler roller together with said second means in directions toward and away from said grinding wheel and said directions being generally parallel to the rotary axis of said dop holding shaft structure.
Claim 9
Dependent Claim
58 words
The invention as defined in claim 7 wherein a screwthreaded shaft means is rotatably mounted on said frame and restrained axially relative thereto, said first carriage having an internally screwthreaded means conformingly engagable by said threaded shaft means whereby rotation of said threaded shaft means causes said carriage to be moved relative to said frame in said directions.
Claim 10
Dependent Claim
49 words
The invention as defined in claim 7 wherein said second means comprises a second carriage movably mounted on said first carriage; said second carriage movable relative to said first carriage in directions toward and away from said dop holding shaft structure and at an angle to the axis thereof.
Claim 11
Dependent Claim
24 words
The invention as defined in claim 3 wherein said counterbalance weight is screwthreadably coupled to said arm for adjustment relative thereto and longitudinally therealong.
Claim 12
Dependent Claim
70 words
The invention as defined in claim 7 wherein said first means is provided with a lower bearing portion pivotally mounted on said first carriage; said first means having an upper bearing portion spaced laterally from said lower bearing portion and said upper bearing portion rotatably mounting said dop holding shaft structure about its rotary axis, said lower bearing portion having a pivotal axis generally parallel to said upper bearing portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |