Roof truss testing machine

Details Roof truss testing machine Roof truss testing machine

1974-08-12

1976-03-09

Haroian, Harry N.

Measuring and testing

Ductility or brittleness

73100, G01N 308

Patent

active

039423620

ABSTRACT:
A truss to be tested is laid on its side on a table having an upstanding flange along one side. A load cell is interposed between one end of the bottom chord of the truss and the table flange and a block is interposed between the opposite end of the bottom chord and the table flange. A flattened flexible tube is disposed on edge along a similar flange on the opposite side of the table. Blocks are inserted between the flexible tube and the top chord of the truss to simulate a uniform snow load when the tube is inflated. One-half the total load is measured directly by the load cell and the deflection of the center of the bottom chord is measured by a scale on the table. If the deflection remains within an allowable amount so as not to close a limit switch within a prescribed loading interval, a timer actuates a rubber stamp to mark the truss as having passed the test.

REFERENCES:
patent: 2058444 (1936-10-01), Harrison
patent: 2668444 (1954-02-01), Berman
patent: 3158021 (1964-11-01), Walters et al.
patent: 3512404 (1970-05-01), Jureit

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