Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Movably interconnected
Patent
1981-10-02
1984-09-11
Caun, Peter M.
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Movably interconnected
160232, F06B 312
Patent
active
044704445
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application contains subject matter related to subject matter in International Application No. PCT/EP80/00066 filed in the United States Designated Office on Oct. 2, 1981 and accorded U.S. Ser. No. 308,552 (U.S. Pat. No. 4,416,047, issued Nov. 22, 1983).
The invention relates to a shutter link for a multi-link overhead shutter or roller blind of the kind having external and internal shells enclosing a cavity and having their longitudinal edge portions bent in mutual engagement to provide claw-shaped sections forming hinge elements.
DESCRIPTION OF THE PRIOR ART
Such a link has, for example, been disclosed in the earlier German Patent Application No. P 29 26 144.7-25 (corresponds to U.S. Pat. No. 4,416,047, issued Nov. 22, 1983). An individual link comprises, for example, a metallic hollow section including an outer shell member and an inner shell member, such two shell members being formed by two profiled strips of metal. Along their longitudinal edges said metallic strips are bent in such a manner as to form portions of claw-like cross section, said portions being in mutual engagement so as to form hinge elements. Said hinge elements are of rotationally symmetrical shape, the result being that also the cross-sectional shape of the leaf is rotationally symmetrical. During manufacture of such a link, said metallic strips are first profiled in such a manner that, after having been joined together, they enclose a hollow space, and the longitudinal edge portions of the metallic strips are bent simultaneously so as to be given a claw-like cross-sectional shape and to engage said longitudinal edge portions with one another. During this bending operation, the presence of differing radii of curvature of the bent portions and a possible displacement of the narrow sides of the hollow space accompanying this operation may cause said narrow sides of the hollow space to be indented towards said space. This is particularly undesirable if the upwardly facing small side of the hollow space is indented in such a manner that it is possible, under unfavorable conditions, that water collects in such indentations.
Therefore, it is the object of the invention to provide a shutter link of the kind mentioned above in which the occurrence of such indentations in the walls of the hollow space is avoided.
SUMMARY OF THE INVENTION
This object is attained by the provision of a shutter link as described above, said shutter link being constructed, according to the invention, by providing the inner and/or outer shell with a longitudinally extending bead disposed in the area between a hinge element and the adjacent narrow side of the cavity formed between the shells. Advantageous embodiments of the invention and a preferred method of manufacturing them are indicated in the sub-claims.
The invention provides for the inner and/or outer shell to be provided with a longitudinally extending bead disposed between a hinge element and the adjacent narrow side of the hollow space or cavity. This bead compensates for the differences in length which, during bending of the two shells in mutual engagement, are caused by the differing radii of curvature. In order to compensate for this difference in length it is sufficient to provide a bead in that shell which has the smaller radius of curvature in the corresponding hinge element. This bead prevents the adjacent narrow side of the cavity from being bent inwardly.
In a preferred modification of the invention, a bead is provided at the corresponding locations in both the outer shell and the inner shell, these beads being in mutual engagement. This measure permits the attainment of an additional fixation of the outer shell in relation to the inner shell, the result being that the shells cannot be displaced in relation to one another as the upper and under sides are engaged by a bending operation for the purpose of forming hinge elements.
For manufacturing the shutter link of the invention it is contemplated to assemble the shutter link by joining two prof
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Nagel Rudolf
Riexinger Gustav
Caun Peter M.
Tuerenwerke Riexinger GmbH & Co. KG
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