Occasional Electronic Publication No. 1 - Society for Industrial ...
Occasional Electronic Publication No. 1 - Society for Industrial ...
Occasional Electronic Publication No. 1 - Society for Industrial ...
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Queen-Post Configurations<br />
Queen-post trusses have tension verticals and crossed diagonals. Inverted queen-post configurations<br />
have compression verticals and tension diagonals.<br />
PATENT CHRONOLOGY<br />
Palmer 1876: Timber top chord. Cable bottom chord. <strong>No</strong> diagonals in center panel.<br />
Mullin 1877: Timber top and bottom chords and crossed diagonals. Vertical rods.<br />
Borneman 1879: Timber top chord and vertical compression posts. Crossed diagonal rods.<br />
Sullivan, Kessler & Foster 1880: Timber chords. Verticals are paired rods. <strong>No</strong> diagonals. Also, four panel<br />
(three verticals) variation without diagonals.<br />
Sherwood 1887: Timber top chord. Bottom chord, verticals, and crossed diagonals are rods.<br />
Ferguson 1891: Top and bottom chords, and crossed diagonals are timber. Verticals are rods. Diagonal<br />
timber strut in end panels.<br />
Hardesty 1892: Timber top chord. Compression posts are metal tubes. Lower chord and crossed diagonals<br />
are rods.<br />
Ball 1893: Top chord is a pipe. Bottom chord, verticals, and crossed diagonals are rods.<br />
Avery, C. 1895: Top chord composed of pipes. Bottom chord, verticals, and crossed diagonals are rods.<br />
Brels<strong>for</strong>d 1895: Timber top chord. Bottom chord, verticals, and diagonals are rods.<br />
Brels<strong>for</strong>d 1899: Tubular top chord. Channel-iron verticals. Bottom chord and crossed diagonals are rods.<br />
Thomas Mullin, Patent <strong>No</strong>. 192,450 (1877)<br />
109
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