Patent US4610837A successfully refreshed from Google Patents.
US4610837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for forming a corrugated sheet from a flat thermoplastic sheet
Assignee: Boeing Co
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Filing: 1984-01-03
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Granted: 1986-09-09
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Expires: 2004-01-03
Abstract
Abstract An apparatus and a method for forming a corrugated sheet from a flat pre-laminated thermoplastic sheet. The flat sheet received between a pair of heated corrugated metal tool sheets with the tool sheets pulled between a pair of stationary tool press plates for forming and cooling the flat sheet into a corrugated sheet.
Inventors
- 👤 Luther R. Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:41
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/0011; B29C53/00; B29C53/22; B29C53/24; B29C53/28; B29L; B29L2009/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
158 words
An apparatus for receiving and forming a flat thermoplastic sheet into an irregular sheet, the apparatus comprising: a first rewind drum; a second rewind drum disposed in a spaced relationship from the first rewind drum; a first flexible metal tool sheet, one end of the sheet attached to the first rewind drum and wrapped therearound, the other end of the tool sheet attached to a pull cable; a second flexible metal tool sheet, one end of the tool sheet attached to the second rewind drum and wrapped therearound, the other end attached to the pull cable; a flat stationary upper tool press plate; and a flat stationary lower tool press plate, the pull cable received between the upper tool plate and the lower tool plate, the pull cable pulling the first and second tool sheets and the flat thermoplastic sheet between the upper tool plate and the lower tool plate and forming and cooling the flat thermoplastic sheet.
Claim 2
Independent Claim
158 words
An apparatus for receiving and forming a flat thermoplastic sheet into an irregular sheet, the apparatus comprising: a first rewind drum; a second rewind drum disposed in a spaced relationship from the first rewind drum; a first flexible metal tool sheet, one end of the sheet attached to the first rewind drum and wrapped therearound, the other end of the tool sheet attached to a pull cable; a second flexible metal tool sheet, one end of the tool sheet attached to the second rewind drum and wrapped therearound, the other end attached to the pull cable; a flat stationary upper tool press plate; and a flat stationary lower tool press plate, the pull cable received between the upper tool plate and the lower tool plate, the pull cable pulling the first and second tool sheets and the flat thermoplastic sheet between the upper tool plate and the lower tool plate and forming and cooling the flat thermoplastic sheet.
Claim 3
Dependent Claim
43 words
The apparatus as described in claim 1 wherein the first and second tool sheets are preheated by a heater as the sheets are unwound from the rewind drums and prior to the tool sheets being received between the upper and lower tool plates.
Claim 4
Dependent Claim
27 words
The apparatus as described in claim 1 further including a flat table disposed adjacent the first and second rewind drums for receiving the flat thermoplastic sheet thereon.
Claim 5
Dependent Claim
56 words
The apparatus as described in claim 1 wherein the pull cable includes a clamp for securing the ends of the first and second tool sheets to the pull cable and a spacer inserted between the ends of the tool sheets for holding the tool sheets apart in a spaced relationship for receiving the flat sheet therebetween.
Claim 6
Dependent Claim
39 words
The apparatus as described in claim 1 wherein the space between the upper tool plate and lower tool plate is slightly less than the free height between the first and second tool sheets and the flat sheet received therebetween.
Claim 7
Independent Claim
184 words
An apparatus for receiving and forming a flat thermoplastic sheet into a corrugated sheet, the apparatus comprising: a first rewind drum; a second rewind drum disposed in a spaced relationship from the first rewind drum; a first flexible corrugated metal tool sheet, one end of the sheet attached to the first rewind drum and wrapped therearound, the other end of the sheet attached to a pull cable; a second flexible corrugated metal tool sheet, one end of the sheet attached to the second rewind drum and wrapped therearound, the other end of the sheet attached to the pull cable; a stationary upper tool press plate; and a stationary lower tool press plate disposed in a spaced relationship from the upper tool plate and parallel thereto, the pull cable received between the upper tool plate and lower tool plate for pulling the first and second metal tool sheets therebetween with the flat sheet received between the first and second tool sheets for forming corrugation therein as the first and second tool sheets and flat sheet are pulled between the stationary upper and lower tool plates.
Claim 8
Independent Claim
184 words
An apparatus for receiving and forming a flat thermoplastic sheet into a corrugated sheet, the apparatus comprising: a first rewind drum; a second rewind drum disposed in a spaced relationship from the first rewind drum; a first flexible corrugated metal tool sheet, one end of the sheet attached to the first rewind drum and wrapped therearound, the other end of the sheet attached to a pull cable; a second flexible corrugated metal tool sheet, one end of the sheet attached to the second rewind drum and wrapped therearound, the other end of the sheet attached to the pull cable; a stationary upper tool press plate; and a stationary lower tool press plate disposed in a spaced relationship from the upper tool plate and parallel thereto, the pull cable received between the upper tool plate and lower tool plate for pulling the first and second metal tool sheets therebetween with the flat sheet received between the first and second tool sheets for forming corrugation therein as the first and second tool sheets and flat sheet are pulled between the stationary upper and lower tool plates.
Claim 9
Independent Claim
103 words
A method for forming a flat thermoplastic sheet into a corrugated sheet, the steps including: heating a pair of metal corrugated tool sheets mounted on rewind drums; inserting a flat thermoplastic sheet between the two metal tool sheets., pulling the two corrugated metal tool sheets between a stationary upper tool press plate and a stationary lower tool press plate with the flat sheet therebetween; compressing and forming the flat sheet into a corrugated sheet as the metal tool sheets are compressed between the upper tool plate and lower tool plate; and cooling the corrugated thermoplastic sheet between the upper and lower tool plates.
Claim 10
Independent Claim
103 words
A method for forming a flat thermoplastic sheet into a corrugated sheet, the steps including: heating a pair of metal corrugated tool sheets mounted on rewind drums; inserting a flat thermoplastic sheet between the two metal tool sheets., pulling the two corrugated metal tool sheets between a stationary upper tool press plate and a stationary lower tool press plate with the flat sheet therebetween; compressing and forming the flat sheet into a corrugated sheet as the metal tool sheets are compressed between the upper tool plate and lower tool plate; and cooling the corrugated thermoplastic sheet between the upper and lower tool plates.
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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) | 1989-09-08 | 1990-03-10 | 1990-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-08 | 1994-03-10 | 1994-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-08 | 1998-03-10 | 1998-09-09 | $7700.00 | Window Closed / Lapsed |