Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
1999-03-02
2001-07-03
Dye, Rena L. (Department: 1772)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C428S036200, C428S036910, C428S036800, C138S129000, C138S132000, C138S137000
Reexamination Certificate
active
06254948
ABSTRACT:
DESCRIPTION
1. Field of the Invention.
The invention relates to a tubular body made of elastomeric material and/or plastic, in particular for the bellows of a pneumatic cushioning system, comprising an outer layer, an inner layer, as well as an embedded reinforcement shaped in particular in the form of axially extending, reinforcing threads (DE-A-36 43 073).
2. The Prior Art
U.S. Pat. No. 3,897,941 describes a hose-like body for a pneumatic spring which is strengthened by a reinforcement, whereby within the framework of a plurality of reinforcing layers, the cords are arranged crossed relative to one another from layer to layer.
Based on the state of the art outlined above, the problem of the invention is to prevent a hose-like body of the type specified above from tearing open in the longitudinal direction.
SUMMARY OF THE INVENTION
This problem is solved in that
the tubular body is equipped with an embedded slotted protection, a transverse reinforcement being used as slotted protection, such reinforcement being present in the crossed form and specifically in connection with a coiled or braided form, and whereby, furthermore,
the slit protection is prepared so as to be friendly to adhesion with the following structure of layers viewed from the outside inwardly:
outer layer;
adhesive layer;
reinforcement;
adhesive layer;
slit protection;
adhesive layer;
inner layer.
It is advantageous if the slit protection is a thread material in particular in the form of a thin thread with high stretchability, in particular again a thread based on polyamide. The thread material is in this connection usefully a single yarn with little or no twist. It is useful, furthermore, if the thread material has a titer of <dtex 470.
The transverse reinforcement particularly in the form of threads is advantageously arranged with wide spacings between the threads relative to one another, whereby the spacing particularly amounts to 5 to 15 mm and is identical in each case.
In connection with the bellows of a pneumatic cushioning system, the slit protection is usefully present either outside of the region of the rolling zone, or over the entire length including the region of the rolling zone.
REFERENCES:
patent: 3603350 (1971-09-01), Monroe
patent: 3897941 (1975-08-01), Hirtreiter et al.
patent: 4954194 (1990-09-01), Crabtree
patent: 5118550 (1992-06-01), Baravian et al.
patent: 5552206 (1996-09-01), Knoke et al.
patent: 36 43 073A (1988-06-01), None
patent: 39 37 819 (1991-05-01), None
patent: 44 23 602A1 (1996-01-01), None
patent: 195 45 079A (1996-06-01), None
patent: 0 476 451A (1992-03-01), None
patent: 2 328 892 (1977-05-01), None
patent: 2 015 691 (1979-09-01), None
Patent Abstracts of Japan, vol. 005, No. 043 (M-060) Mar. 23, 1981 & JP 55 166514A (Hitachi Cable) Dec. 25, 1980.
Patent Abstracts of Japan, vol. 007, No. 211 (M-243) Sep. 17, 1983 & JP 58 106238A (Yokohama Gomu KK) Jun. 24, 1983.
Patent Abstracts of Japan, vol. 010, No. 167 (M-488) Jun. 13, 1986 & JP 61 017733A (Yokohama Gomu KK) Jan. 25, 1986.
Patent Abstracts of Japan vol. 010, No. 021 (M-449) Jan. 28, 1986 & JP 60 179538A (Bridgestone KK) Sep. 13, 1985.
Patent Abstracts of Japan vol. 012, No. 281 (M-842) Jun. 27, 1989 & JP 01 074333A (Sumitomo elec) Mar. 20, 1989.
Collard & Roe P.C.
Dye Rena L.
Hon Sow-Fun
Phoenix Aktiengesellschaft
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