Static structures (e.g. – buildings) – Machine or implement
Patent
1978-07-31
1980-06-10
Ridgill, Jr., James L.
Static structures (e.g., buildings)
Machine or implement
52484, 52461, 52781, E04B 552
Patent
active
042065780
ABSTRACT:
A structure of a grid tee member for suspension ceilings, and a method for producing such structure is disclosed. Such grid tee provides a web, a bulb at one web extremity and a flange at the other web extremity. The tee section includes three strips of material in which the first strip is relatively thin and is shaped to provide the web, a portion of the bulb and a portion of the flanges. A separate cap strip is secured to the flanges on the side thereof remote from the web and separate stiffening material having a generally U-shaped cross section is located within the bulb with the base of the U located at the extremity of the section. The three strips provide a structure in which material is concentrated at the extremities and is therefore efficiently placed to provide a high moment of inertia and high rigidity to the total structure. The thickness of the three strips is separately selected so that the material forming the section efficiently functions to provide a cross section in which the centroid is substantially midway between the extremities. The illustrated structure is produced by a method in which the stiffener strip and the strip forming the main structure of the section are lance knitted while the two strips are in the flat condition and then are simultaneously formed to produce the bulb with a U-shaped stiffener enclosed within the bulb.
REFERENCES:
patent: 717923 (1903-01-01), Rapp
patent: 1143266 (1915-06-01), Hamilton
patent: 1179820 (1916-04-01), Gilliland
patent: 1737033 (1929-11-01), Talbot
patent: 3284977 (1966-11-01), Lickliter et al.
patent: 3350125 (1967-10-01), Adams
patent: 3645051 (1972-02-01), Kolesar
Donn Incorporated
Ridgill, Jr. James L.
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