US3865673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of pseudosubsurface scoring and cutting glass sheets and sheet cut thereby
Assignee: Mpac Group PLC
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Filing: 1973-11-20
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Granted: 1975-02-11
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Expires: 1993-11-20
Abstract
Abstract Pieces of flat glass are cut to desired size without the necessity of grinding to size and polishing. Edges of the piece are cut in accordance with a procedure involving the use of a large diameter scoring wheel at a greater-than-usual applied pressure, to produce a pseudosubsurface score, followed by the application of heat to the score and/or the application of a bending moment about the score to propagate a fracture in the piece of glass. Light seaming of the top and bottom portions of the edges completes the preparation of those edges.
Inventors
- 👤 Robert P Detorre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:53
CPC Classifications
C; C03; C03B; C03B33/00; C03B33/02; C03B33/023; C03B33/033; C03B33/09; C03B33/091; C03B33/10; C03B33/105; C03B33/107; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57; Y10; Y10T; Y10T225/00; Y10T225/10; Y10T225/12; Y10T225/30; Y10T225/304; Y10T225/307; Y10T225/321; Y10T225/325; Y10T428/00; Y10T428/15
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
195 words
In a method of cutting a refractory material selected from the group consisting of glasses, ceramics and glass-ceramics wherein a scoring force is applied to a scoring tool on a surface of said material, relative movement is imparted between said tool and said material to form a score in said material along an intended path of cut and, thereafter, force is applied to said material to sever it along said score and intended path of cut, the improvement comprising: applying said scoring force to a rotary scoring tool having a continuous cutting edge with an effective cutting angle of from about 150* to less than 180* in an amount and at a rate of relative movement between said tool and said material sufficient to produce a pseudosubsurface score in said material extending a substantial distance into said material and substantially perpendicular to and along said path, a substantial portion of said score along the length of its tip being spaced from the adjacent surface of the material by a microscopic zone of damaged but substantially spall- and wingfree material, and projecting said score deeper into the thickness of said material after said score is produced.
Claim 2
Dependent Claim
195 words
In a method of cutting a refractory material selected from the group consisting of glasses, ceramics and glass-ceramics wherein a scoring force is applied to a scoring tool on a surface of said material, relative movement is imparted between said tool and said material to form a score in said material along an intended path of cut and, thereafter, force is applied to said material to sever it along said score and intended path of cut, the improvement comprising: applying said scoring force to a rotary scoring tool having a continuous cutting edge with an effective cutting angle of from about 150* to less than 180* in an amount and at a rate of relative movement between said tool and said material sufficient to produce a pseudosubsurface score in said material extending a substantial distance into said material and substantially perpendicular to and along said path, a substantial portion of said score along the length of its tip being spaced from the adjacent surface of the material by a microscopic zone of damaged but substantially spall- and wingfree material, and projecting said score deeper into the thickness of said material after said score is produced.
Claim 3
Dependent Claim
20 words
A method fo cutting as defined in claim 1, wherein said score is produced in a piece of flat glass.
Claim 4
Dependent Claim
20 words
A method of cutting as defined in claim 1, wherein said score is produced in a piece of ceramic material.
Claim 5
Dependent Claim
20 words
A method of cutting as defined in claim 1, wherein said score is produced in a piece of glass-ceramic material.
Claim 6
Dependent Claim
29 words
A method of cutting as defined in claim 2, further including the step of: finishing upper and lower portions of the cut edge produced along said path of cut.
Claim 7
Dependent Claim
23 words
A method of cutting as defined in claim 5, wherein said finishing comprises seaming said upper and lower portions of said cut edge.
Claim 8
Dependent Claim
22 words
A method of cutting as defined in claim 2, wherein said score is projected by applying a bending moment about said score.
Claim 9
Dependent Claim
23 words
A method of cutting as defined in claim 2, wherein said score is projected by applying heat along the length of said score.
Claim 10
Dependent Claim
32 words
A method of cutting as defined in claim 2, wherein said score is projected by applying heat along the length of said score followed by applYing a bending moment about said score.
Claim 11
Dependent Claim
36 words
A method of cutting as defined in claim 2, further including the step of: placing a narrow member against the bottom surface of said glass and directly beneath the intended path before the score is produced.
Claim 12
Dependent Claim
16 words
A method of cutting as defined in claim 10, wherein said narrow member is a wheel.
Claim 13
Dependent Claim
20 words
A method of cutting as defined in claim 11, wherein said wheel has a knife-edge surface formed on its periphery.
Claim 14
Dependent Claim
37 words
A method of cutting as defined in claim 2, wherein said score is produced by forcing a wheel having a diameter of from approximately 18 millimeters to approximately 200 millimeters against a major surface of the glass.
Claim 15
Dependent Claim
34 words
A method of cutting as defined in claim 2, wherein said score is produced by forcing a wheel having a diameter of at least approximately 12 millimeters against a major surface of the glass.
Claim 16
Dependent Claim
19 words
A method of cutting as defined in claim 14, wherein said wheel has a cutting angle of approximately 163*.
Claim 17
Dependent Claim
23 words
A method of cutting as defined in claim 14, wherein said wheel has a cutting angle of from about 150* to about 170*.
Claim 18
Dependent Claim
27 words
A method of cutting as defined in claim 16, wherein said wheel produces said score at a force of from approximately 30 kilograms to approximately 900 kilograms.
Claim 19
Dependent Claim
24 words
A method of cutting as defined in claim 15, wherein said wheel produces said score at a force of at least approximately 30 kilograms.
Claim 20
Dependent Claim
28 words
A method of cutting as defined in claim 14, wherein said wheel travels along the intended path at a speed of up to approximately 25 centimeters per second.
Claim 21
Dependent Claim
27 words
A method of cutting as defined in claim 14, wherein said wheel travels along the intended path at a speed up to approximately 30 centimeters per second.
Claim 22
Dependent Claim
27 words
A method of cutting as defined in claim 14, wherein said wheel travels along the intended path at a speed up to approximately 40 centimeters per second.
Claim 23
Dependent Claim
27 words
A method of cutting as defined in claim 14, wherein said wheel travels along the intended path at a speed up to approximately 50 centimeters per second.
Claim 24
Dependent Claim
42 words
A method of cutting as defined in claim 7, further including the step of: placing a narrow member against the bottom surface of said glass and directly beneath said score before the bending moment is applied to place the glass in tension.
Claim 25
Dependent Claim
171 words
In a method of scoring a piece of glass wherein a scoring force is applied to a scoring wheel on a major surface of said glass and relative movement is imparted between said wheel and said glass to form a score in said glass along an intended path of cut, the improvement comprising: positioning a scoring wheel having an effective cutting angle of from about 150* to less than 180* on a major surface of said piece of glass, applying a scoring force to said wheel in a direction substantially perpendicular to said major surface sufficient to produce a pseudosubsurface score, said force being within the range of from approximately 30 kilograms to approximately 900 kilograms, and advancing said wheel along the intended path of said score at a rate of relative movement between said wheel and said glass of up to approximately 50 centimeters per second to produce a said score below said path and spaced from said surface by a zone of weakened but substantially spall- and wing-free glass.
Claim 26
Dependent Claim
171 words
In a method of scoring a piece of glass wherein a scoring force is applied to a scoring wheel on a major surface of said glass and relative movement is imparted between said wheel and said glass to form a score in said glass along an intended path of cut, the improvement comprising: positioning a scoring wheel having an effective cutting angle of from about 150* to less than 180* on a major surface of said piece of glass, applying a scoring force to said wheel in a direction substantially perpendicular to said major surface sufficient to produce a pseudosubsurface score, said force being within the range of from approximately 30 kilograms to approximately 900 kilograms, and advancing said wheel along the intended path of said score at a rate of relative movement between said wheel and said glass of up to approximately 50 centimeters per second to produce a said score below said path and spaced from said surface by a zone of weakened but substantially spall- and wing-free glass.
Claim 27
Dependent Claim
22 words
A method scoring as defined in claim 24, wherein said wheel has a cutting angle of from approximately 155* to approximately 170*.
Claim 28
Dependent Claim
194 words
In a method of producing a cut edge on a piece of glass wherein a scoring force is applied to a scoring wheel on a surface of said piece of glass, relative movement is imparted between said wheel and said glass to form a score in said glass along an intended path of cut and, thereafter, force is applied to said material to sever it along said score and intended path of cut, the improvement comprising: Applying said scoring force to a scoring wheel having an effective cutting angle of from about 150* to less than 180* in an amount and at a rate of relative movement between said wheel and said glass sufficient to produce a pseudosubsurface score in said glass extending a substantial distance into said glass and substantially perpendicular to and along said path, a substantial portion of said score along the length of its tip being spaced from the adjacent surface of the glass by a zone of substantially spall- and wing-free glass, the area of said score being visually apparent in ordinary light, and projecting said score deeper into the thickness of said glass after said score is produced.
Claim 29
Dependent Claim
194 words
In a method of producing a cut edge on a piece of glass wherein a scoring force is applied to a scoring wheel on a surface of said piece of glass, relative movement is imparted between said wheel and said glass to form a score in said glass along an intended path of cut and, thereafter, force is applied to said material to sever it along said score and intended path of cut, the improvement comprising: Applying said scoring force to a scoring wheel having an effective cutting angle of from about 150* to less than 180* in an amount and at a rate of relative movement between said wheel and said glass sufficient to produce a pseudosubsurface score in said glass extending a substantial distance into said glass and substantially perpendicular to and along said path, a substantial portion of said score along the length of its tip being spaced from the adjacent surface of the glass by a zone of substantially spall- and wing-free glass, the area of said score being visually apparent in ordinary light, and projecting said score deeper into the thickness of said glass after said score is produced.
Claim 30
Dependent Claim
153 words
In a method of scoring a refractory material selected from the group consisting of glasses, ceramics and glass-ceramics wherein a scoring force is applied to a scoring tool on a surface of said material and relative movement is imparted between said tool and said material to form a score in said material along an intended path of cut, the improvement comprising: applying said scoring force to a rotary scoring tool having a continuous cutting edge with an effective cutting angle of from about 150* to less than 180* in an amount and a rate of relative movement between said tool and said glass sufficient to produce a pseudosubsurface score in said material extending substantially perpendicular to and along said path, a substantial portion of said score along the length of its tip being spaced from the adjacent surface of the material by a microscopic zone of damaged but substantially spall- and wing-free glass.
Claim 31
Dependent Claim
153 words
In a method of scoring a refractory material selected from the group consisting of glasses, ceramics and glass-ceramics wherein a scoring force is applied to a scoring tool on a surface of said material and relative movement is imparted between said tool and said material to form a score in said material along an intended path of cut, the improvement comprising: applying said scoring force to a rotary scoring tool having a continuous cutting edge with an effective cutting angle of from about 150* to less than 180* in an amount and a rate of relative movement between said tool and said glass sufficient to produce a pseudosubsurface score in said material extending substantially perpendicular to and along said path, a substantial portion of said score along the length of its tip being spaced from the adjacent surface of the material by a microscopic zone of damaged but substantially spall- and wing-free glass.
Claim 32
Dependent Claim
154 words
In a method of scoring a piece of glass wherein a force is applied to a scoring wheel on a surface of said piece of glass and relative movement is imparted between said wheel and said glass to form a score in said glass along an intended path of cut, the improvement comprising: applying said force to a scoring wheel having an effective cutting angle of from about 150* to less than 180* in an amount and at a rate of relative movement between said wheel and said glass sufficient to produce a pseudosubsurface score in said glass extending a substantial distance into said glass and substantially perpendicular to and along said path, a substantial portion of said score along the length of its tip being spaced from the adjacent surface of the glass by a zone of substantially spall- and wing-free glass, the area of said score being visually apparent in ordinary light.
Claim 33
Dependent Claim
154 words
In a method of scoring a piece of glass wherein a force is applied to a scoring wheel on a surface of said piece of glass and relative movement is imparted between said wheel and said glass to form a score in said glass along an intended path of cut, the improvement comprising: applying said force to a scoring wheel having an effective cutting angle of from about 150* to less than 180* in an amount and at a rate of relative movement between said wheel and said glass sufficient to produce a pseudosubsurface score in said glass extending a substantial distance into said glass and substantially perpendicular to and along said path, a substantial portion of said score along the length of its tip being spaced from the adjacent surface of the glass by a zone of substantially spall- and wing-free glass, the area of said score being visually apparent in ordinary light.
Claim 34
Dependent Claim
156 words
In a method of weakening glass along an intended path of cut wherein a scoring force is applied to a scoring tool on a surface of said glass and relative movement is imparted between said tool and said glass to form a score in said glass along said intended path of cut, the improvement comprising: applying said scoring force to a rotary scoring tool having a continuous cutting edge with an effective cutting angle of from about 150* to less than 180* in an amount and at a rate of relative movement between said tool and said glass sufficient to produce a pseudosubsurface score in the glass under a major surface thereof, said score being nearest to said major surface but spaced therefrom by an intervening zone of substantially spall- and wing-free glass, the area of said score being visually apparent in ordinary light and said major surface of said glass being substantially smooth and unblemished.
Claim 35
Dependent Claim
156 words
In a method of weakening glass along an intended path of cut wherein a scoring force is applied to a scoring tool on a surface of said glass and relative movement is imparted between said tool and said glass to form a score in said glass along said intended path of cut, the improvement comprising: applying said scoring force to a rotary scoring tool having a continuous cutting edge with an effective cutting angle of from about 150* to less than 180* in an amount and at a rate of relative movement between said tool and said glass sufficient to produce a pseudosubsurface score in the glass under a major surface thereof, said score being nearest to said major surface but spaced therefrom by an intervening zone of substantially spall- and wing-free glass, the area of said score being visually apparent in ordinary light and said major surface of said glass being substantially smooth and unblemished.
Claim 36
Dependent Claim
37 words
A method of weakening glass as defined in claim 29, wherein said intervening zone is a minute zone of weakened glass extending at least about 0.025 millimeters in depth and up to about 0.5 millimeters in width.
Claim 37
Dependent Claim
37 words
A method of weakening glass as defined in claim 29, wherein said intervening zone is a minute zone of weakened glass extending up to about 0.0125 millimeters in depth and up to about 0.25 millimeters in width.
Claim 38
Dependent Claim
23 words
A method of weakening glass as defined in claim 29, wherein said intervening zone is between about 0.01 and 0.02 millimeters in depth.
Claim 39
Dependent Claim
11 words
A product produced in accordance with the method of claim 1.
Claim 40
Dependent Claim
11 words
A product produced in accordance with the method of claim 27.
References Cited (Backward Citations)
US3795572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |