US3607188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for bending glass sheets
Assignee: PPG Industries Inc
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Filing: 1969-08-06
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Granted: 1971-09-21
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Expires: 1989-08-06
Abstract
Abstract Apparatus and method for shaping glass into spherical shapes by extrusion using a ring support, a plunger movable from above to below said ring support and means other than a mold shaping surface for receiving the shaped glass disposed below the ring support.
Inventors
- 👤 George W Stilley
- 👤 Herbert W Eilenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:14
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/025; C03B23/0256
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
48 words
Apparatus as in claim 1, wherein said support pad is disposed below said support ring a vertical distance approximately one-half inch greater than the radius of the sphere defining the sphericall portion to which the glass sheet is to be bent for receiving said glass sheet after shaping.
Claim 2
Dependent Claim
34 words
Apparatus as in claim 1, wherein said convex wall is apertured and means is provided for forcing air under pressure through said apertured wall to release a bent sheet of glass from said plunger.
Claim 3
Dependent Claim
53 words
Apparatus as in claim 1, wherein said means for moving said plunger is arranged for moving said plunger along a vertical axis and said ring comprises an outer edge portion forming a circular horizontal ledge and an inner edge portion forming a frustoconical ledge that extends downward and inward from said horizontal ledge.
Claim 4
Dependent Claim
16 words
Apparatus as in claim 1, wherein said convex wall is in the form of a hemisphere.
Claim 5
Dependent Claim
35 words
Apparatus as in claim 5, wherein said support ring has an inner edge whose radius exceed the radius of said plunger by a distance approximately equal to the thickness of a glass sheet undergoing shaping.
Claim 6
Dependent Claim
31 words
Apparatus as in claim 1, further including a circular furnace having an upper portion supporting said means for moving said plunger moving means and a movable floor supporting said support ring.
Claim 7
Independent Claim
118 words
A method of bending a glass sheet into a hemisphere comprising supporting said glass sheet with its lower surface on the upper surface of a support ring, heating said sheet to its deformation temperature while lowering a plunger having a diameter less than the support ring by approximately twice the thickness of said glass sheet into pressurized contact with its upper surface, extruding said sheet through said support ring to form said sheet to its desired shape while the lower surface of said sheet is out of contact with a solid member, and depositing the sheet so formed on a refractory member having a different curvature than and heat exchange properties similar to those of said glass hemisphere.
Claim 8
Dependent Claim
31 words
The method as in claim 8, further including cooling said hemisphere through the annealing range of glass at a controlled rate while supported at its lower surface on said refractory member.
Claim 9
Dependent Claim
26 words
The method as in claim 8, wherein said plunger is lowered intermittently to permit said heated glass sheet to recover its elasticity between said intermittent lowerings.
References Cited (Backward Citations)
US1671548A
Cited
US3459521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |