US3837833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heated cover protector for press bending block
Assignee: PPG Industries Inc
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Filing: 1972-06-12
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Granted: 1974-09-24
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Expires: 1992-06-12
Abstract
Abstract A press bending member having a shaping surface of predetermined contour covered with a flexible cover member which tends to wear rapidly in certain areas is provided with metal cover protectors to eliminate wear in said areas. The metal cover protectors are heated by passing electrical currents therethrough to eliminate any tendency for thermal shock to occur in glass sheets contacting the same during press bending operations.
Inventors
- 👤 G Couture
- 👤 L Lindberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:47
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/03; C03B23/031
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
230 words
Apparatus for use in the press bending of glass sheets comprising a press bending member having means defining a shaping surface adapted to complement the shaping surface of a further press bending member such as to impart the desired shape to a heat softened glass sheet when the latter is engaged in pressurized relation between said press bending members, said shaping surface of the first mentioned press bending member having a flexible heat resistant covering thereon, one or more areas of said heat resistant covering being more susceptible to wear than other areas of the cover, a relatively thin flexible metal protector means comprising a plate overlying at least said one or more areas of said covering to protect same against wear, said thin metal plate being mounted on said shaping surface in such manner as to permit thermal expansion thereof relative to said shaping surface without buckling, wherein said metal cover protector means has a tendency to absorb heat from said glass sheet portions coming in contact with same at a greater rate than heat is absorbEd from other portions of the glass thus tending to cause thermal stresses in the glass, and means for effecting sufficient heating of said metal cover protector means so as to substantially reduce any tendency of the latter to cause breakage of the glass sheets as a result of thermal stressing during bending.
Claim 2
Dependent Claim
230 words
Apparatus for use in the press bending of glass sheets comprising a press bending member having means defining a shaping surface adapted to complement the shaping surface of a further press bending member such as to impart the desired shape to a heat softened glass sheet when the latter is engaged in pressurized relation between said press bending members, said shaping surface of the first mentioned press bending member having a flexible heat resistant covering thereon, one or more areas of said heat resistant covering being more susceptible to wear than other areas of the cover, a relatively thin flexible metal protector means comprising a plate overlying at least said one or more areas of said covering to protect same against wear, said thin metal plate being mounted on said shaping surface in such manner as to permit thermal expansion thereof relative to said shaping surface without buckling, wherein said metal cover protector means has a tendency to absorb heat from said glass sheet portions coming in contact with same at a greater rate than heat is absorbEd from other portions of the glass thus tending to cause thermal stresses in the glass, and means for effecting sufficient heating of said metal cover protector means so as to substantially reduce any tendency of the latter to cause breakage of the glass sheets as a result of thermal stressing during bending.
Claim 3
Dependent Claim
20 words
Apparatus according to claim 1, wherein said metal plate has a thickness from about 0.010 inch to about 0.020 inch.
Claim 4
Dependent Claim
47 words
Apparatus according to claim 1, wherein said means for heating said metal protector means includes means for passing an electrical current through said metal protector means to maintain same at a temperature sufficient to avoid breakage of the glass coming in contact therewith due to thermal shock.
Claim 5
Dependent Claim
19 words
Apparatus according to claim 1, wherein said first mentioned press bending member is of the ring or outline variety.
Claim 6
Dependent Claim
19 words
Apparatus according to claim 3, wherein said first mentioned press bending member is of the ring or outline variety.
Claim 7
Dependent Claim
37 words
Apparatus according to claim 1, wherein said first mentioned bending member is of the ring or outline variety and includes wing sections pivotally connected to opposing ends thereof, said protector means being located on said wing sections.
Claim 8
Dependent Claim
37 words
Apparatus according to claim 3, wherein said first mentioned bending member is of the ring or outline variety and includes wing sections pivotally connected to opposing ends thereof, said protector means being located on said wing sections.
Claim 9
Dependent Claim
19 words
Apparatus according to claim 1, wherein said first mentioned bending member has a shaping surface of generally concave configuration.
Claim 10
Dependent Claim
19 words
Apparatus according to claim 6, wherein said first mentioned bending member has a shaping surface of generally concave configuration.
Claim 11
Dependent Claim
85 words
A press bending member for shaping heat softened glass sheets having relatively rigid means defining a shaping surface, a layer of insulating material overlying said shaping surface, a thin flexible metal plate overlying at least a portion of said insulating material to protect said portion against rapid wear, said metal plate being mounted to permit it to expand relative to said mold under the influence of thermal expansion forces, and means for heating said metal plate to reduce thermal shock in hot glass containing same.
Claim 12
Dependent Claim
85 words
A press bending member for shaping heat softened glass sheets having relatively rigid means defining a shaping surface, a layer of insulating material overlying said shaping surface, a thin flexible metal plate overlying at least a portion of said insulating material to protect said portion against rapid wear, said metal plate being mounted to permit it to expand relative to said mold under the influence of thermal expansion forces, and means for heating said metal plate to reduce thermal shock in hot glass containing same.
Claim 13
Dependent Claim
17 words
A press bending member according to claim 10, wherein said flexible insulating material comprises fibre glass fabric.
Claim 14
Dependent Claim
30 words
A press bending member according to claim 10, wherein said metal plate is mounted to permit it to expand relative to said mold under the influence of thermal expansion forces.
Claim 15
Dependent Claim
18 words
A press bending member according to claim 10 wherein said metal plate is 0.010 to 0.020 inches thick.
Claim 16
Dependent Claim
176 words
A press bending member of the outline type defining an outline shaping surface of predetermined contour, a layer of flexible insulating material overlying said outline shaping surface, an area of said insulting material being subject to rapid localized wear, and a thin flexible metal plate overlying at least said area of said insulating material which is subject to localized wear, said metal plate being relatively loosely secured to said bending member so that it is free to expand and contract relative to said bending member under the influence of large temperature changes without buckling, wherein said metal cover protector means has a tendency to absorb heat from said glass sheet portions coming in contact with same at a greater rate than heat is absorbed from other portions of the glass thus tending to cause thermal stresses in the glass, and means for effecting sufficient heating of said metal cover protector means so as to substantially reduce any tendency of the latter to cause breakage of the glass sheets as a result of thermal stressing during bending.
Claim 17
Dependent Claim
176 words
A press bending member of the outline type defining an outline shaping surface of predetermined contour, a layer of flexible insulating material overlying said outline shaping surface, an area of said insulting material being subject to rapid localized wear, and a thin flexible metal plate overlying at least said area of said insulating material which is subject to localized wear, said metal plate being relatively loosely secured to said bending member so that it is free to expand and contract relative to said bending member under the influence of large temperature changes without buckling, wherein said metal cover protector means has a tendency to absorb heat from said glass sheet portions coming in contact with same at a greater rate than heat is absorbed from other portions of the glass thus tending to cause thermal stresses in the glass, and means for effecting sufficient heating of said metal cover protector means so as to substantially reduce any tendency of the latter to cause breakage of the glass sheets as a result of thermal stressing during bending.
Claim 18
Dependent Claim
203 words
Apparatus for use in the press bending of glass sheets comprising a press bending member having means defining a shaping surface adapted to complement the shaping surface of a further press bending member such as To impart the desired shape to a heat softened glass sheet when the latter is engaged in pressurized relation between said press bending members, said shaping surface of the first mentioned press bending member having a flexible heat resistant covering thereon, one or more areas of said heat resistant covering being more susceptible to wear than other areas of the cover, a relatively thin flexible metal protector means comprising a plate overlying at least said one or more areas of said covering to protect same against wear, said metal cover protector means having a tendency to absorb heat from said glass sheet portions coming in contact with same at a greater rate than heat is absorbed from other portions of the glass thus tending to cause thermal stresses in the glass, and means for effecting sufficient heating of said metal cover protector means so as to substantially reduce any tendency of the latter to cause breakage of the glass sheets as a result of thermal stressing during bending.
Claim 19
Dependent Claim
203 words
Apparatus for use in the press bending of glass sheets comprising a press bending member having means defining a shaping surface adapted to complement the shaping surface of a further press bending member such as To impart the desired shape to a heat softened glass sheet when the latter is engaged in pressurized relation between said press bending members, said shaping surface of the first mentioned press bending member having a flexible heat resistant covering thereon, one or more areas of said heat resistant covering being more susceptible to wear than other areas of the cover, a relatively thin flexible metal protector means comprising a plate overlying at least said one or more areas of said covering to protect same against wear, said metal cover protector means having a tendency to absorb heat from said glass sheet portions coming in contact with same at a greater rate than heat is absorbed from other portions of the glass thus tending to cause thermal stresses in the glass, and means for effecting sufficient heating of said metal cover protector means so as to substantially reduce any tendency of the latter to cause breakage of the glass sheets as a result of thermal stressing during bending.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |