Patent US3815215A successfully refreshed from Google Patents.
US3815215A
Expired / Lapsed
US
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Method of forming a honeycomb structural panel
Assignee: Rohr Inc
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Filing: 1972-10-06
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Granted: 1974-06-11
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Expires: 1992-10-06
Abstract
Abstract A honeycomb structural panel has a first portion of original manufactured thickness and a second portion, integral therewith, of substantially less thickness. In the first portion, the core cell walls are straight from end to end and parallel with each other. In the second portion, the cell walls are axially crushed and distorted so that their overall lengths are less than their original lengths. The crushed cell walls are much weaker than the others. Therefore, these cells are filled with plastic cured to a rigid state. Since all of the walls are confined in the plastic, they can no longer distort, and the combination of cells and plastic is adequate for the imposed loads. The method involved consists in forming apertures in a selected portion of one facing sheet, with at least one aperture communicating with each cell, filling the cells through the apertures with a liquid filler, pressing the facing sheets together to crush the cell walls while extruding excess filler through the apertures, and then curing the filler in place to a rigid state to reinforce the crushed cells.
Inventors
- 👤 G Medawar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:07
CPC Classifications
B; B21; B21D; B21D47/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49888; Y10T29/4998; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24165; Y10T428/24273
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
A method of forming a dual thickness honeycomb structural panel comprising: providing a panel having a honeycomb core made up of a multiplicity of cells bonded to each other to form an integral structure and opening at the opposite faces of the core in substantially parallel relation with each other and a continuous facing sheet overlying each face of the core and bonded to the ends of the cells to complete the panel; substantially completely filling each of the cells in a selected portion of the panel with a filler material in a liquid state; pressing the facing sheets in said selected portion of the panel toward each other to axially crush the cells in said portion and reduce the thickness of the portion while extruding the excess filler material from the cells; and curing the remaining filler material in situ in the cells to a rigid state to reinforce the cell walls and prevent their collapse.
Claim 2
Independent Claim
157 words
A method of forming a dual thickness honeycomb structural panel comprising: providing a panel having a honeycomb core made up of a multiplicity of cells bonded to each other to form an integral structure and opening at the opposite faces of the core in substantially parallel relation with each other and a continuous facing sheet overlying each face of the core and bonded to the ends of the cells to complete the panel; substantially completely filling each of the cells in a selected portion of the panel with a filler material in a liquid state; pressing the facing sheets in said selected portion of the panel toward each other to axially crush the cells in said portion and reduce the thickness of the portion while extruding the excess filler material from the cells; and curing the remaining filler material in situ in the cells to a rigid state to reinforce the cell walls and prevent their collapse.
Claim 3
Dependent Claim
68 words
The method as claimed in claim 1; including forming apertures in at least one of the facing sheets in said selected portion of the panel with at least one aperture communicating with each cell in said portion; inserting the filler material into the cells thorugh the apertures until the cells are substantially completely filled; and extruding excess filler material through the apertures during the pressing and crushing operation.
Claim 4
Dependent Claim
35 words
The method as claimed in claim 2; including: spreading liquid filler material over the apertured portion of the facing sheet; and moving an applying tool over the filler material to force it through the apertures.
Claim 5
Dependent Claim
67 words
The method as claimed in claim 2; including: applying a layer of liquid filler material to the apertured portion of the facing sheet; and drawing a spreader blade in contact with the sheet and at an angle thereto over the layer to force the material into the apertures; and repeating the application of the filler material and the spreader blade until the cells are substantially completely filled.
Claim 6
Dependent Claim
29 words
The method as claimed in claim 2; including: immersing the selected portion of the panel in a bath of liquid filler material until the cells are substantially completely filled.
Claim 7
Dependent Claim
59 words
The method as claimed iN claim 2; including: applying compression pressure to the apertured portion of the facing sheet with a presser foot having a generally planar contact face formed with a multiplicity of flow channels; and causing the excess filler material extruded from the cells to flow through said channels to waste during the pressing and crushing operation.
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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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |