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US 4,349,295 AGranted
Structural ridge member for vibrating concrete screeds
OwnerDonald R. Morrisoninventor
Life of this patent
Estimating the term…
Abstract
An improved frame construction for a portable, vibrating-type concrete screed incorporates a specially designed hollow ridge tube extending along the apex of an elongated open frame of triangular cross section and providing means for adjusting relative angular positions of adjoining screed units and for passage of air when the screed is air operated.
Claims1
A structural ridge member for use in air-vibrated concrete screeds of the isosceles triangle shaped, separable frame unit type, said ridge member being molded as an integral replaceable one piece member comprising:
- (a) a hollow strengthening ridge tube portion adapted for being horizontally positioned at the apex of an isosceles triangle shaped screed frame unit so as to extend with its bore for the length of such frame unit and being internally threaded adjacent each of its bore ends;
- and
- (b) integral with said ridge tube portion on opposite sides thereof downwardly and outwardly extending integral solid flange portions extending for the length of said ridge tube portion and having holes formed therein enabling other structural members of said frame unit to be detachably attached thereto.
Dependencies are inferred from the claim text.