← Back to Patent Explorer
US3846104A Expired / Lapsed US ⏱️ 0.0 years remaining

Handling glass sheets for shaping and cooling

Assignee: PPG Industries Inc
•
Filing: 1973-01-10
•
Granted: 1974-11-05
•
Expires: 1993-01-10
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract 1. In a method of handling a glass sheet comprising (a) supporting said glass sheet while said sheet is at its deformation temperature between a lower shaping mold and an upper shaping mold having complementary shaping surfaces conforming to the shape desired for said glass sheet, (b) lifting said lower sheet along its lower surface until said engaged glass sheet is sandwiched between said lower shaping mold and said upper shaping mold, and (c) supporting said glass sheet by vacuum against said upper shaping mold. the improvement comprising (1) retracting said lower shaping mold from said upper shaping mold while supporting said glass sheet by vacuum against said upper shaping mold, (2) introducing means to support said glass sheet adjacent its marginal edge only to a position aligned immediately adjacent to and below said upper mold and above said lower mold, (3) releasing said glass sheet from said upper mold with said glass sheet support means disposed therebeneath to deposit said glass sheet onto said glass sheet support means, (4) transferring said glass sheet while on said glass sheet support means to a cooling station, (5) immediately cooling said glass sheet with tempering medium while supported on said glass sheet support means at a rapid enough rate to impart at least a partial temper to the glass sheet, and (6) removing said glass sheet from said glass sheet support means after said cooling.

Inventors

  • 👤 S Seymour

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 15:23
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/035; C03B23/0352; C03B23/0357; C03B23/03; C03B27/00; C03B27/04; C03B27/0404; C03B27/044; C03B27/0442; C03B27/0447; C03B35/00; C03B35/14; C03B35/20; C03B35/202; C03B40/00; C03B40/005; C03B2225/00; C03B2225/02

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 232 words
In a method of handling a glass sheet comprising (a) supporting said glass sheet while said sheet is at its deformation temperature between a lower shaping mold and an upper shaping mold having complementary shaping surfaces conforming to the shape desired for said glass sheet, (b) lifting said lower sheet along its lower surface until said engaged glass sheet is sandwiched between said lower shaping mold and said upper shaping mold, and (c) supporting said glass sheet by vacuum against said upper shaping mold. the improvement comprising (1) retracting said lower shaping mold from said upper shaping mold while supporting said glass sheet by vacuum against said upper shaping mold, (2) introducing means to support said glass sheet adjacent its marginal edge only to a position aligned immediately adjacent to and below said upper mold and above said lower mold, (3) releasing said glass sheet from said upper mold with said glass sheet support means disposed therebeneath to deposit said glass sheet onto said glass sheet support means, (4) transferring said glass sheet while on said glass sheet support means to a cooling station, (5) immediately cooling said glass sheet with tempering medium while supported on said glass sheet support means at a rapid enough rate to impart at least a partial temper to the glass sheet, and (6) removing said glass sheet from said glass sheet support means after said cooling.
Claim 2
Dependent Claim 232 words
In a method of handling a glass sheet comprising (a) supporting said glass sheet while said sheet is at its deformation temperature between a lower shaping mold and an upper shaping mold having complementary shaping surfaces conforming to the shape desired for said glass sheet, (b) lifting said lower sheet along its lower surface until said engaged glass sheet is sandwiched between said lower shaping mold and said upper shaping mold, and (c) supporting said glass sheet by vacuum against said upper shaping mold. the improvement comprising (1) retracting said lower shaping mold from said upper shaping mold while supporting said glass sheet by vacuum against said upper shaping mold, (2) introducing means to support said glass sheet adjacent its marginal edge only to a position aligned immediately adjacent to and below said upper mold and above said lower mold, (3) releasing said glass sheet from said upper mold with said glass sheet support means disposed therebeneath to deposit said glass sheet onto said glass sheet support means, (4) transferring said glass sheet while on said glass sheet support means to a cooling station, (5) immediately cooling said glass sheet with tempering medium while supported on said glass sheet support means at a rapid enough rate to impart at least a partial temper to the glass sheet, and (6) removing said glass sheet from said glass sheet support means after said cooling.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-11-04 1978-05-06 1978-11-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-11-04 1982-05-06 1982-11-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-11-04 1986-05-06 1986-11-05 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag