US3869269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for press shaping heat-softened sheets
Assignee: PPG Industries Inc
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Filing: 1973-06-20
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Granted: 1975-03-04
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Expires: 1993-06-20
Abstract
Abstract Method and apparatus for controlling deviations from desired shape of a glass sheet during roll forming wherein, in between adjacent pairs of shaping rolls, additional rolling contact is provided against that portion of the sheet that deviates from the shape desired.
Inventors
- 👤 Isaac D Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:20
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/03; C03B23/033; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
160 words
Apparatus for shaping a deformable sheet by roll forming while continuously moving the latter through said shaping apparatus comprising an upper set of rotatable shaping rolls, a lower set of rotatable shaping rolls, each shaping roll of one set having a longitudinally extending surface, each shaping roll of the other set having a longitudinally extending surface and each shaping roll of said one set having a shape complementary to a corresponding shaping roll of said other set, the longitudinally extending surface of at least one of said shaping rolls having a portion thereof which approaches the central longitudinal axis of that roll to provide a wide space between said portion of that roll and a corresponding portion of an adjacent roll of its set, supporting means for mounting auxiliary roller means in said wide space in a position to contact a portion of said deformable sheet conveyed through said shaping apparatus, and auxiliary roller means mounted on said supporting means.
Claim 2
Dependent Claim
160 words
Apparatus for shaping a deformable sheet by roll forming while continuously moving the latter through said shaping apparatus comprising an upper set of rotatable shaping rolls, a lower set of rotatable shaping rolls, each shaping roll of one set having a longitudinally extending surface, each shaping roll of the other set having a longitudinally extending surface and each shaping roll of said one set having a shape complementary to a corresponding shaping roll of said other set, the longitudinally extending surface of at least one of said shaping rolls having a portion thereof which approaches the central longitudinal axis of that roll to provide a wide space between said portion of that roll and a corresponding portion of an adjacent roll of its set, supporting means for mounting auxiliary roller means in said wide space in a position to contact a portion of said deformable sheet conveyed through said shaping apparatus, and auxiliary roller means mounted on said supporting means.
Claim 3
Dependent Claim
29 words
Apparatus as in claim 1 wherein each shaping roll of said one set has a convex curvature and each shaping roll of said other set has a concave curvature.
Claim 4
Dependent Claim
69 words
Apparatus as in claim 2, further including a set of spaced conveyor rolls disposed along a given path of travel through said shaping apparatus, each of said conveyor rolls being disposed between adjacent pairs of said shaping rolls, and wherein said additional roller means is supported by one of said spaced conveyor rolls in position to extend above the retracted position occupied by said lower set of shaping rolls.
Claim 5
Dependent Claim
35 words
Apparatus as in claim 3, wherein said additional roller means has an outer shaped surface whose curvature matches the curvature of at least one of said segments of a shaping roll of said lower set.
Claim 6
Dependent Claim
34 words
Apparatus as in claim 4, wherein said additional roller means is supported on said conveyor roll in longitudinal alignment along said path of travel with a centrally disposed segment of said lower shaping roll.
Claim 7
Dependent Claim
35 words
Apparatus as in claim 2, wherein said shaping rolls comprise shaped segments and said additional roller means has an outer shaped surface whose curvature matches the curvature of at least one of said shaped segments.
Claim 8
Dependent Claim
30 words
Apparatus as in claim 2, wherein said additional roller means is located in a vertical plane approximately midway between the vertical planes occupied by two adjacent oF said shaping rolls.
Claim 9
Dependent Claim
62 words
Apparatus as in claim 2, wherein said additional roller means is supported to extend above said given path and in a vertical plane intermediate adjacent of said shaping rolls to make rolling contact with a portion of the lower surface of said sheet when said portion of said sheet deviates downwardly from the shape desired therefor by at least a predetermined amount.
Claim 10
Dependent Claim
59 words
Apparatus as in claim 2, wherein said additional roller means is positioned and between two adjacent shaping rolls of said upper set in position to make rolling contact with an edge portion of the upper surface of said sheet when said edge portion of said sheet deviates upwardly from the shape desired therefor by at least a predetermined amount.
Claim 11
Dependent Claim
29 words
Apparatus as in claim 9, wherein said additional roller means is located in a vertical plane approximately midway between the vertical planes occupied by adjacent of said shaping rolls.
Claim 12
Dependent Claim
36 words
Apparatus as in claim 9, wherein said additional roller means is in the form approximating a truncated cone with the base of the cone facing transversely inward and the apex of the cone facing transversely outward.
Claim 13
Independent Claim
163 words
A method of shaping a deformable sheet comprising engaging the opposite surfaces of said sheet while softened in pressurized engagement between an upper set of rotating shaping rolls and a lower set of rotating shaping rolls, each shaping roll having a longitudinally extending surface, each shaping roll of said one set having shape complementary to a corresponding shaping roll of said other set, the longitudinally extending surface of at least one of said shaping rolls having a portion thereof which approaches the central longitudinal axis of that roll to provide a wide space between said portion of that roll and a corresponding portion of an adjacent roll of its set, and, in said wide space and between said pair of sets of rotating shaping rolls, applying additional rolling contact to a portion of said sheet that deviates from the shape desired while leaving a substantial portion of the remainder of the width of said sheet aligned with a portion free of rolling contact.
Claim 14
Independent Claim
163 words
A method of shaping a deformable sheet comprising engaging the opposite surfaces of said sheet while softened in pressurized engagement between an upper set of rotating shaping rolls and a lower set of rotating shaping rolls, each shaping roll having a longitudinally extending surface, each shaping roll of said one set having shape complementary to a corresponding shaping roll of said other set, the longitudinally extending surface of at least one of said shaping rolls having a portion thereof which approaches the central longitudinal axis of that roll to provide a wide space between said portion of that roll and a corresponding portion of an adjacent roll of its set, and, in said wide space and between said pair of sets of rotating shaping rolls, applying additional rolling contact to a portion of said sheet that deviates from the shape desired while leaving a substantial portion of the remainder of the width of said sheet aligned with a portion free of rolling contact.
Claim 15
Dependent Claim
21 words
The method according to claim 12, wherein said additional rolling contact is applied against the upper surface only of said sheet.
Claim 16
Dependent Claim
22 words
The method according to claim 13, wherein said additional rolling contact is applied approximately midway between adjacent pairs of rotatable shaping rolls.
Claim 17
Dependent Claim
19 words
The method according to claim 13, wherein said rolling contact is applied along at least one edge portion thereof.
Claim 18
Dependent Claim
21 words
The method as in claim 13, wherein said rolling contact is applied along a pair of opposite side edge portions thereof.
Claim 19
Dependent Claim
11 words
The method according to claim 13, wherein said sheet is glass.
Claim 20
Dependent Claim
21 words
The method according to claim 12, wherein said additional rolling contact is applied against the lower surface only of said sheet.
Claim 21
Dependent Claim
22 words
The method according to claim 18, wherein said rolling contact is applied along a portion intermediate opposite side edges of said sheet.
Claim 22
Dependent Claim
22 words
The method according to claim 18, wherein said additional rolling contact is applied approximately midway between adjacent pairs of rotatable shaping rolls.
Claim 23
Dependent Claim
11 words
The method according to claim 18, wherein said sheet is glass.
References Cited (Backward Citations)
US3701644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |