US4274858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molds for press bending glass sheets
Assignee: PPG Industries Ohio Inc
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Filing: 1980-01-28
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Granted: 1981-06-23
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Expires: 2000-01-28
Abstract
Abstract In fabricating a press bending mold having a flexible metal shaping member such as a plate or a frame, a reinforcing grate and adjustable attachment means extending through certain apertures in the reinforcing grate to adjust the shape of the metal shaping member, localized distortion of the shaping member that formerly occurred when the attachment means were bonded to the shaping member by welding or soldering is eliminated by using a thermosetting adhesive capable of application at room temperature, such as an epoxy resin adhesive, to bond the attachment means to the flexible metal shaping member. When the former and the latter have bonding surfaces composed of aluminum, an epoxy resin containing finely divided aluminum filling is preferred.
Inventors
- 👤 George R. Claassen
- 👤 Raymond J. Mickelic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:12
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/03; C03B23/031
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
Apparatus for press bending a heat-softened glass sheet by pressurized engagement thereagainst comprising: 1. a metal member deformable in the direction of its thickness and having a shaping surface whose shape approximates that of the shape desired for the glass sheet after bending and having sufficient rigidity to resist deformation during pressurized engagement against a heat-softened glass sheet, 2. a relatively rigid member more rigid that said metal member located in spaced relation behind and in facing relation to said metal plate, and comprising a grate with a plurality of elongated openings therein, 3. adjustable attachment means distributed in spaced relation throughout the area of said deformable member and said relatively rigid member by which the shape of said deformable member may be altered, and 4. an organic thermosetting adhesive bonding said adjustable attachment means to the rear surface of said deformable metal member.
Claim 2
Dependent Claim
144 words
Apparatus for press bending a heat-softened glass sheet by pressurized engagement thereagainst comprising: 1. a metal member deformable in the direction of its thickness and having a shaping surface whose shape approximates that of the shape desired for the glass sheet after bending and having sufficient rigidity to resist deformation during pressurized engagement against a heat-softened glass sheet, 2. a relatively rigid member more rigid that said metal member located in spaced relation behind and in facing relation to said metal plate, and comprising a grate with a plurality of elongated openings therein, 3. adjustable attachment means distributed in spaced relation throughout the area of said deformable member and said relatively rigid member by which the shape of said deformable member may be altered, and 4. an organic thermosetting adhesive bonding said adjustable attachment means to the rear surface of said deformable metal member.
Claim 3
Dependent Claim
14 words
Apparatus as in claim 1, wherein said adhesive consists essentially of an epoxy resin.
Claim 4
Dependent Claim
31 words
Apparatus as in claim 2, wherein said deformable metal member and said attachment means have bonding surfaces composed of aluminum and said epoxy resin adhesive contains a finely divided aluminum filling.
Claim 5
Dependent Claim
17 words
Apparatus as in claim 1, wherein said deformable metal member is in the form of a frame.
Claim 6
Dependent Claim
18 words
Apparatus as in claim 1, wherein said deformable metal member is in the form of a solid plate.
Claim 7
Dependent Claim
19 words
Apparatus as in claim 1, further including an additional grate spaced an adjustable distance behind said first named grate.
Claim 8
Dependent Claim
52 words
Apparatus as in claim 6, wherein said first named grate and said additional grate have open areas sufficient to provide less mass per unit area than the total mass of a pair of solid plates, each having half the thickness of and the same outline area as that of its corresponding grate.
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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) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |