# US 4,394,412 A · Composite member comprising metallic sheet bent to be arcuate in section and rigid synthetic resin coating

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- Number: US 4,394,412 A
- Document ID: US4394412A
- Status: Granted
- Kind: A
- Application number: 06/261,924
- Filed: 1981-05-08
- Granted: 1983-07-19
- Earliest claimed: 1981-03-31
- Assignees: Matsushita Electric Works, Ltd.
- Inventors: Hideomi Yamamoto; Haruzo Watanabe; Hidehiko Kishie; Toshio Nishihara
- Web page: https://patentgrep.com/patent/US4394412A

## CPC

- E04D 13/064: Gutters {(drainage channels on the roof surface E04D13/0445; gutters for greenhouses A01G9/1476)}
- B29C 48/001: {Combinations of extrusion moulding with other shaping operations}
- B29C 48/0018: {combined with shaping by orienting, stretching or shrinking, e.g. film blowing (B29C48/0017 takes precedence)}
- B29C 48/0019: {combined with shaping by flattening, folding or bending}
- B29C 48/002: {combined with surface shaping}
- B29C 48/0022: {combined with cutting}
- B29C 48/08: flexible, e.g. films
- B29C 48/12: Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
- B29C 48/154: Coating solid articles, i.e. non-hollow articles
- B29C 48/21: the layers being joined at their surfaces
- Y10T 29/49982: Coating
- Y10T 29/49986: Subsequent to metal working
- Y10T 428/24628: Nonplanar uniform thickness material
- Y10T 428/24669: Aligned or parallel nonplanarities
- Y10T 428/24777: Edge feature
- E04D: ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS (coverings of outer walls by plaster or other porous material E04F13/00)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A length composite member comprising a metallic sheet and a rigid synthetic resin coating is bent to be arcuate in transversal section. The thickness of the metallic sheet of such composite member as bent to be arcuate in transversal section is extremely small as compared with the radius of curvature of the desired arcuate sectional curve. A plurality of small arcuate sectional bent portions in transversal section are formed distributed in the transversal or width direction of the metallic sheet. The centers of the respective curvatures of these plurality of small arcuate sectional bent portions in transversal section are selected to exist on the same side as that of the center of curvature of the composite member bent to be arcuate. The metallic sheet is generally bent in advance to be arcuate in transversal section and both main surfaces of the metallic sheet thus bent are coated with rigid synthetic resin. The thickness of the coated layers of the rigid synthetic resin is selected to be sufficiently large as compared with that of the metallic sheet.

## Claims

### Claim 1

A composite member bent to be arcuate in transversal section, comprising:
a metallic sheet bent to be arcuate in transversal section with respect to a first center of curvature and formed with a plurality of small arcuate sectional protuberances extending in the longitudinal direction and distributed only in the transversal direction, each of said small arcuate sectional protuberance being curved with respect to a second center of curvature,
said first center of curvature and each said second center of curvature being selected to be positioned on the same side with respect to said metallic sheet, and
a rigid synthetic resin layer covering both main surfaces of said metallic sheet, said composite member being formed in a length,
the length of said metallic sheet being selected to be substantially the same as the length of said length of the composite member, and
said plurality of small arcuate sectional protuberances being formed as protuberances extending continuously throughout the length of said metallic sheet.

### Claim 2 (depends on 1)

A composite member in accordance with claim 1, wherein
said metallic sheet are further formed with in-between arcuate sectional curved portions between the respective adjacent small arcuate sectional protuberances, each of said in-between arcuate sectional curved portions being curved with respect to a third center of curvature selected to be located on the side opposite to that of said first center of curvature with respect to said metallic sheet.

### Claim 3

A composite member in accordance with any one of the preceding claims, wherein
said plurality of small arcuate sectional protuberances are distributed equispaced throughout the width of said metallic sheet.

### Claim 4 (depends on 1)

A composite member in accordance with claim 1, wherein
said metallic sheet is curved with a first radius of curvature to be arcuate in transversal section with respect to said first center of curvature, and
the thickness of said metallic sheet is selected to be smaller than 1/100 of said first radius of curvature of said arcuate sectional curve with respect to said first center of curvature.

### Claim 5 (depends on 1)

A composite member in accordance with claim 1, which further comprises
an adhesive agent formed between said metallic sheet and said rigid synthetic resin layer for improving adhesiveness therebetween.