Land vehicles – Wheeled – Attachment
Patent
1995-05-19
1998-12-08
English, Peter C.
Land vehicles
Wheeled
Attachment
428218, B60R 2120
Patent
active
058459294
ABSTRACT:
A covering device for air-bag-collision-safety systems, including a cap formed of a frame and a cover. The cover is provided with predetermined tear lines forming cover sections, whereby the cover sections are connected in a hinge manner with the frame. The covering device is injection molded of a foamed thermoplastic material, especially an elastomer. Areas of various layer thicknesses lying in the gripping area of the user, such that the surface layers lying in the gripping area of the user, as well as the areas of the covering device used for attachment have a lower pore volume and correspondingly a higher density and hardness between 50 Shore A and 75 Shore D. A layer having a characteristic foamed structure is formed under the surface layers lying in the gripping area of the user, whereby the thickness ratio between the thicker surface layer and the foamed structure is 1 at the most. The foaming takes place while the volume of the mold is stepwise or continuously increased, whereby either the mold halves are separated on a preset path while the pressure in the mold is correspondingly reduced, or parts of the mold are drawn back in the cavity at certain preset points while the pressure in the mold is correspondingly reduced.
REFERENCES:
patent: 4120516 (1978-10-01), Takamatsu et al.
patent: 4891085 (1990-01-01), Mulligan
patent: 5110647 (1992-05-01), Sawada et al.
patent: 5316822 (1994-05-01), Nishijima et al.
patent: 5470634 (1995-11-01), Persson et al.
Helfrich Rudolf
Schlett Egon
Vath Norbert
English Peter C.
Petri AG
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