Method and apparatus for stiffening sections and a mechanical jo

Details Method and apparatus for stiffening sections and a mechanical jo Method and apparatus for stiffening sections and a mechanical jo

1985-02-01

1986-11-11

Marcus, Stephen

Pipes and tubular conduits

Reinforced

29251, 29432, B23P 1902

Patent

active

046216618

ABSTRACT:
A mechanical connection for connecting together a juxtaposed first and second layer of malleable sheet material includes the use of a third layer of malleable sheet material overlying the first and second layers, with the second layer sandwiched between the first and third layers. The first layer has a first displaced pocket projecting away from the second layer, and the second layer has a second displaced pocket nesting within the first displaced pocket. The third layer has an aperture in registry with both pockets, the aperture resulting from the punching out of a disc or slug which is nested within the second displaced pocket. In a preferred embodiment, a length of duct with at least one flat wall has an intermediate lateral stiffener which includes a base leg defined by two juxtaposed layers of sheet metal, the base leg being connected with the flat wall against which it is juxtaposed by the mechanical connection described above.

REFERENCES:
patent: 641580 (1900-01-01), Cummins
patent: 760216 (1904-05-01), Laws
patent: 1791255 (1931-02-01), Wagner
patent: 1935690 (1933-11-01), Zack
patent: 2275572 (1942-03-01), Somers
patent: 2491700 (1949-12-01), Zwerling
patent: 3202184 (1965-08-01), Godshalk
patent: 3729804 (1973-05-01), Middleton
patent: 4046409 (1977-09-01), Virgin
patent: 4252350 (1981-02-01), Smitka
"A New Mechanical Joining Technique", Sawhill et al., (SAE Technical Paper Series 830128, ISSN 0148-7191), Published 2-28-83.

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