US4759815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forming thermoplastic laminates into major sections
Assignee: Boeing Co
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Filing: 1986-01-09
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Granted: 1988-07-26
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Expires: 2006-01-09
Abstract
Abstract A method and apparatus for bending flat thermoplastic laminates into structural shapes such as angles, channels, Z sections, J sections and I sections. In order to bend the laminate into the desired shape by appropriate tooling, heat is applied in a localized manner only to the area that is to be bent. The application of heat is sufficient to heat the laminate to its softening temperature in the bend area, and the plies of the laminate can thus slip in the bend area only as bending force is applied so that the bend can be made without the need to heat the entire laminate to the softening temperature.
Inventors
- 👤 Luthur R. Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:52
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/02; B29C53/04; B29C67/00; B29C67/0044; B29L; B29L2009/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
157 words
A method of bending a thermoplastic laminate having multiple plies bonded together to form a substantially flat sheet, said method comprising the steps of: feeding the sheet into and through a curved passage having a uniform width substantially equal to the thickness of the sheet to thereby apply a bending force to the sheet as the sheet is moved through said curved passage, with only a portion of the sheet in the curved passage at any time; and applying heat to whatever portion of the sheet is disposed in the passage in a localized manner as said bending force is being applied thereto, said application of heat being sufficient to raise the temperature of said portion of the sheet to an elevated level at which the plies of the laminate slip along one another, whereby the ply slippage permits the bending force to bend said portion of the sheet into conformity with the curvature of the passage.
Claim 2
Independent Claim
157 words
A method of bending a thermoplastic laminate having multiple plies bonded together to form a substantially flat sheet, said method comprising the steps of: feeding the sheet into and through a curved passage having a uniform width substantially equal to the thickness of the sheet to thereby apply a bending force to the sheet as the sheet is moved through said curved passage, with only a portion of the sheet in the curved passage at any time; and applying heat to whatever portion of the sheet is disposed in the passage in a localized manner as said bending force is being applied thereto, said application of heat being sufficient to raise the temperature of said portion of the sheet to an elevated level at which the plies of the laminate slip along one another, whereby the ply slippage permits the bending force to bend said portion of the sheet into conformity with the curvature of the passage.
Claim 3
Dependent Claim
25 words
The method of claim 1, including the step of effecting cooling of a leading end portion of the sheet as same emerges from the passage.
Claim 4
Independent Claim
156 words
A method of bending a thermoplastic laminate having multiple plies bonded together to form a substantially flat sheet, said method comprising the steps of: inserting the sheet between aligned channels formed in first and second tools; rigidly clamping the sheet in the channel of the first tool; moving one of the tools to effect misalignment of the channels while permitting the sheet to slip in the channel of the second tool, thereby applying a bending force to the sheet at a location thereon between the channels; and applying heat to the portions of the sheet in the channels in a localized manner as said bending force is being applied thereto, said application of heat being sufficient to raise the temperature of said portions of the sheet to an elevated level at which the plies of the laminate slip along one another, whereby the ply slippage permits the bending force to effect a bend in said sheet.
Claim 5
Independent Claim
156 words
A method of bending a thermoplastic laminate having multiple plies bonded together to form a substantially flat sheet, said method comprising the steps of: inserting the sheet between aligned channels formed in first and second tools; rigidly clamping the sheet in the channel of the first tool; moving one of the tools to effect misalignment of the channels while permitting the sheet to slip in the channel of the second tool, thereby applying a bending force to the sheet at a location thereon between the channels; and applying heat to the portions of the sheet in the channels in a localized manner as said bending force is being applied thereto, said application of heat being sufficient to raise the temperature of said portions of the sheet to an elevated level at which the plies of the laminate slip along one another, whereby the ply slippage permits the bending force to effect a bend in said sheet.
Claim 6
Independent Claim
188 words
A method of bending a thermoplastic laminate having multiple plies bonded together to form a substantially flat sheet, said method comprising the steps of: inserting a central portion of the sheet through a channel formed in a stationary tool; inserting the sheet through channels formed in a pair of movable tools located on opposite sides of the stationary tool; rigidly clamping said central portion in said channel of the stationary tool; and moving the movable tools parallel to one another in a direction generally perpendicular to said channels to bend the sheet into a channel member having a web portion formed in the channel of the stationary tool and side walls formed between the stationary tool and the movable tools; and applying heat to the portions of the sheet in the channels in a localized manner as said movable tools are being moved, said application of heat being sufficient to raise the temperature of said portions of the sheet to an elevated level at which the plies of the laminate slip along one another, whereby the ply slippage permits the bending of the sheet into said channel member.
Claim 7
Independent Claim
188 words
A method of bending a thermoplastic laminate having multiple plies bonded together to form a substantially flat sheet, said method comprising the steps of: inserting a central portion of the sheet through a channel formed in a stationary tool; inserting the sheet through channels formed in a pair of movable tools located on opposite sides of the stationary tool; rigidly clamping said central portion in said channel of the stationary tool; and moving the movable tools parallel to one another in a direction generally perpendicular to said channels to bend the sheet into a channel member having a web portion formed in the channel of the stationary tool and side walls formed between the stationary tool and the movable tools; and applying heat to the portions of the sheet in the channels in a localized manner as said movable tools are being moved, said application of heat being sufficient to raise the temperature of said portions of the sheet to an elevated level at which the plies of the laminate slip along one another, whereby the ply slippage permits the bending of the sheet into said channel member.
Claim 8
Independent Claim
127 words
A method of bending a thermoplastic laminate having multiple plies bonded together to form a substantially flat sheet, said method comprising the steps of: clamping the sheet to a clamp tool; effecting a separation in one edge portion of the sheet to provide a pair of separable branches therein; bending said branches in opposite directions to extend generally perpendicular to the sheet, whereby said branches cooperate to form a generally straight cross on the sheet; and applying heat to said branches in a localized manner during bending of the branches, said application of heat being sufficient to raise the temperature of said branches to an elevated level at which the plies of the laminate slip along one another, whereby the ply slippage permits bending of the branches.
Claim 9
Independent Claim
127 words
A method of bending a thermoplastic laminate having multiple plies bonded together to form a substantially flat sheet, said method comprising the steps of: clamping the sheet to a clamp tool; effecting a separation in one edge portion of the sheet to provide a pair of separable branches therein; bending said branches in opposite directions to extend generally perpendicular to the sheet, whereby said branches cooperate to form a generally straight cross on the sheet; and applying heat to said branches in a localized manner during bending of the branches, said application of heat being sufficient to raise the temperature of said branches to an elevated level at which the plies of the laminate slip along one another, whereby the ply slippage permits bending of the branches.
Claim 10
Dependent Claim
26 words
The method of claim 3, wherein said heat applying step comprises applying heat to the sheet from opposite sides thereof during movement of said one tool.
Claim 11
Dependent Claim
29 words
The method of claim 3, wherein said heat applying step comprises applying heat to said first tool at different locations thereon as the movement of said one tool progresses.
Claim 12
Dependent Claim
72 words
The method of claim 3, wherein: said moving step comprises moving said one tool in a direction substantially perpendicular to said channels, and said moving step is terminated while an end portion of the sheet remains in the channel of the second tool, whereby the sheet is bent into the general shape of a Z having a web portion thereof formed between the tools and leg portions thereof formed in the channels.
Claim 13
Dependent Claim
45 words
The method of claim 4, wherein the step of moving the movable tools is terminated while opposite end portions of the sheet remain in the channels of the movable tools, whereby flanges of the channel member are formed in the channels of the movable tools.
Claim 14
Dependent Claim
43 words
The method of claim 5, including the step of bending an edge portion of the sheet opposite said one edge portion in a direction to extend generally perpendicular to the sheet, whereby the sheet is shaped in the general configuration of a J.
Claim 15
Dependent Claim
35 words
The method of claim 5, including the step of bonding a foil sheet to each branch to effect said separation while maintaining the foil sheets detached from one another to facilitate separation of the branches.
Claim 16
Dependent Claim
30 words
The method of claim 11, including the step of extending each foil sheet out of the separation beyond the end of the branches to facilitate separation of the foil sheets.
Claim 17
Dependent Claim
76 words
The method of claim 5, wherein said bending step comprises: providing a forming tool having a passage for receiving said one edge portion of the sheet and a pair of cross channels extending from said passage generally perpendicular thereto in opposite directions for receiving the branches; inserting said edge portion of the sheet into said passage; and moving the clamp and forming tools together to bend the branches into the respective cross channels from the passage.
Claim 18
Independent Claim
181 words
A method of bending a thermoplastic laminate formed by multiple plies bonded together into a substantially flat sheet, said method comprising the steps of: moving a leading end portion and trailing portions of the sheet into and through a curved passage having a uniform width substantially equal to the thickness of the sheet; applying sufficient heat to the passage as the sheet is being moved therethrough to heat only whatever portion of the sheet is then in the passage to a temperature at which the plies slip relative to one another, whereby slippage of the plies in the passage permits the sheet to bend as the sheet is moved through said curved passage; effecting cooling of the leading end portion of the sheet as same emerges from the passage; stopping the feeding of the sheet while a selected trailing portion thereof is disposed in the passage; effecting cooling of said selected portion in the passage; and removing said selected portion of the sheet from the passage, whereby said selected portion is bent substantially in conformity with the curvature of the passage.
Claim 19
Independent Claim
181 words
A method of bending a thermoplastic laminate formed by multiple plies bonded together into a substantially flat sheet, said method comprising the steps of: moving a leading end portion and trailing portions of the sheet into and through a curved passage having a uniform width substantially equal to the thickness of the sheet; applying sufficient heat to the passage as the sheet is being moved therethrough to heat only whatever portion of the sheet is then in the passage to a temperature at which the plies slip relative to one another, whereby slippage of the plies in the passage permits the sheet to bend as the sheet is moved through said curved passage; effecting cooling of the leading end portion of the sheet as same emerges from the passage; stopping the feeding of the sheet while a selected trailing portion thereof is disposed in the passage; effecting cooling of said selected portion in the passage; and removing said selected portion of the sheet from the passage, whereby said selected portion is bent substantially in conformity with the curvature of the passage.
Claim 20
Dependent Claim
12 words
The method of claim 14, wherein said passage curves through approximately 180°.
References Cited (Backward Citations)
US3533872A
Cited
US3657040A
Cited
US4097573A
Cited
US4022860A
Cited
US4184905A
Cited
US4098785A
Cited
US4160006A
Cited
US4610837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |