Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1981-10-02
1983-11-22
Moon, Charlie T.
Metal working
Method of mechanical manufacture
Assembling or joining
29418, 29445, 29463, 29509, 29514, 29 33K, 160232, 160235, B23P 300, B23P 1904
Patent
active
044160470
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application contains subject matter related to subject matter in U.S. patent application Ser. No. 308,551 filed Oct. 2, 1981.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a shutter link for a multi-link overhead shutter or roller blind comprising a hollow section formed by two sheet-metal shells, the cavity of said hollow profile being filled with a heat-insulating compound, said link being provided with hinge elements on the longitudinal edges of the hollow profile, said link being provided with two slots adjacent to the two hinge elements and extending the length of the link, said slots being defined by flanges which are bent inwardly towards the cavity.
2. Description of the Prior Art
There has been known a shutter link of the kind named (German Patent No. DE-OS 27 35 899). In this known shutter link, the two sheet-metal shells are provided with bent portions on their longitudinal edges which comprise the hinge elements. In the vicinity of the bent portions, there is provided, between the two sheet-metal shells, a slot serving to exclude the formation of a cold-transmitting bridge. The slot is bridged by a diaphragm made of a plastic material which has a low thermal conductivity. The two sheet-metal shells are held together by the heat-insulating foam material extending rearwardly of said bent portions.
While the German Patent No. DE-OS 27 35 899 does not disclose the manner in which the known shutter link is to be manufactured, it is apparent that the operations of assembling the two sheet-metal shells, of providing the hinge elements and of applying the plastic diaphragm require the expenditure of labor and time and that such operations are not adapted to provide a continuous manufacturing method.
SUMMARY OF THE INVENTION
It is the object of the invention to construct a shutter link of the kind described above in such a manner that it is adapted to be manufactured by means of a continuous automatic manufacturing method.
Said object is attained, according to the invention, by the following features: towards the cavity and converging to form a U-shape, said flanges being provided, on the cavity side, with notches extending parallel to the slot and being disposed adjacent to the base of the bent flanges.
The feature (a) makes it possible to form the slots by means of cutting rolls while the shutter link is supported on its opposite side against the pressure of the slotting rolls by bearing in a simple manner, for example, against a bottom strip without it being necessary to have the shutter link carry with it any special holding means. This is not possible if the slots are provided on the longitudinal edges having the hinge elements formed therein as is the case with the known shutter link.
Feature (b) makes it possible to avoid upward bending of the portion of the respective sheet-metal shell extending between the slots as a result of the deforming pressure applied by the slotting rolls; in addition, this part cannot be separated from the heat-insulating compound if the adhesive power should be reduced.
Feature (c) also assists in the formation of the slots by non-cutting forming by means of slotting rolls which are particularly adapted to be employed in a continuous automatic manufacturing process.
During manufacture of the shutter link of the invention the sheet-metal shell to be provided with the slots may be provided, in addition to the two notches located on the inner side of the cavity, with an additional notch extending centrally between the said notches on the side facing away from the cavity. This additional notch facilitates the operation of forming the slot by means of the slotting rolls.
In a preferred embodiment of the method of manufacturing the shutter links of the invention, provisions are made to have withdrawn from a supply structure two metallic strips which are wound onto strip coils, said strips being transformed into the metallic hollow section by means of a two-window roll forming machine. In thi
REFERENCES:
patent: 1352656 (1920-09-01), Cahill
patent: 3004324 (1961-10-01), Macomber
patent: 3511301 (1970-05-01), Graham et al.
patent: 3547603 (1970-12-01), Bragman
patent: 3968561 (1976-07-01), Oakes et al.
patent: 4162571 (1979-07-01), Harvay
Nagel Rudolf
Riexinger Gustav
Moon Charlie T.
Tuerenwerke Riexinger GmbH & Co. KG
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