Complex light metal framework produced by combining sectional pieces interconnected in a detachable manner by means of flexible strips having a novel structure

Claim 1

A complex metal framework for use in fabricating structural members having means to clamp a sheet like article, said framework comprising: a. a main sectional piece having a wall defining a plurality of longitudinally extending cavities therein including a central cavity and a plurality of laterally displaced cavities, each lateral cavity having at least one inclined wall, and the central cavity having two inclined walls, each cavity having an open end and a base portion disposed opposite said open end, the width of the open end being less than the width of the base portion; b. a second sectional piece shape so as to be inserted into one of said cavities such that a first portion of the second sectional piece contacts a portion of the wall defining the cavities and a second portion of the second sectional piece contacts the sheet like article; and c. a resilient flexible strip inserted into said one cavity, said resilient flexible strip having a short section and a long section the ends of which contact the inclined wall of said one cavity, and a median section formed integral with and located between said short and long sections, said median section contacting the second sectional piece inserted into said one cavity so as to bias said second sectional piece against said sheet like article to clamp said article between said second sectional piece and said main sectional piece.