US3871855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for roll-press forming heat-softened glass sheets
Assignee: PPG Industries Inc
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Filing: 1973-07-05
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Granted: 1975-03-18
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Expires: 1993-07-05
Abstract
Abstract Improvements in roll forming apparatus for shaping heat-softened sheets comprising segmented shaping rolls incorporating means to reduce and even eliminate certain surface markings that sometimes result from shaping thermoplastic sheets such as glass sheets by roll forming.
Inventors
- 👤 Robert G Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:03
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/03; C03B23/033
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
166 words
In apparatus for shaping glass sheets by the roll forming process comprising: a set of upper shafts for supporting upper segmented shaping rolls, a set of lower shafts for supporting lower segmented shaping rolls, upper and lower segmented shaping rolls mounted in opposed pairs on said upper and lower shafts, respectively, each of said pairs of shaping rolls comprising a series of adjacent, axially aligned shaping roll segments, at least some of said adjacent segments having different diameters, and at least one of the segments of each of said pairs of shaping rolls being fixed to its supporting shaft to rotate therewith, a predominate number of said segments Of said shaping rolls being freely rotatable about their respective shafts, the improvement comprising separator means affixed to said supporting shaft between at least some of said adjacent segments of different diameters, said separator means being spaced on said shaft so that only one of said adjacent segments of different diameters contacts said separator means at a time.
Claim 2
Dependent Claim
166 words
In apparatus for shaping glass sheets by the roll forming process comprising: a set of upper shafts for supporting upper segmented shaping rolls, a set of lower shafts for supporting lower segmented shaping rolls, upper and lower segmented shaping rolls mounted in opposed pairs on said upper and lower shafts, respectively, each of said pairs of shaping rolls comprising a series of adjacent, axially aligned shaping roll segments, at least some of said adjacent segments having different diameters, and at least one of the segments of each of said pairs of shaping rolls being fixed to its supporting shaft to rotate therewith, a predominate number of said segments Of said shaping rolls being freely rotatable about their respective shafts, the improvement comprising separator means affixed to said supporting shaft between at least some of said adjacent segments of different diameters, said separator means being spaced on said shaft so that only one of said adjacent segments of different diameters contacts said separator means at a time.
Claim 3
Dependent Claim
27 words
The improvement as in claim 1, which further includes means to lighten certain of said segments disposed between said shaft and the outer surface of said segments.
Claim 4
Dependent Claim
22 words
The improvement as in claim 2, wherein said means to lighten said certain segments includes apertured portions extending through said certain segments.
Claim 5
Dependent Claim
18 words
The improvement as in claim 3, wherein said apertures are arranged in a circular pattern about said shaft.
Claim 6
Dependent Claim
59 words
In the apparatus as in claim 3, wherein some shaping roll segments have a larger diameter than other shaping roll segments, the improvement wherein said apertured portions extending through said shaping roll segments of larger diameter are relatively larger in cross-section and said apertured portions extending through said shaping roll segments of smaller diameter are relatively smaller in cross-section.
Claim 7
Dependent Claim
39 words
The improvement as in claim 1, wherein said shafts are grooved to receive a snap ring between adjacent segments of said shaping rolls and a low-friction snap ring is mounted in each of said grooves intermediate said adjacent segments.
Claim 8
Dependent Claim
15 words
The improvement as in claim 1, wherein said shafts are oriented in an oblique plane.
Claim 9
Dependent Claim
27 words
The improvement as in claim 7, which further includes means to lighten certain of said segments disposed between said shaft and the outer surface of said segments.
Claim 10
Dependent Claim
39 words
The improvement as in claim 7, wherein said shafts are grooved to receive a snap ring between adjacent segments of said shaping rolls and a low-friction snap ring is mounted in each of said grooves intermediate said adjacent segments.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |