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braces thus formed up between the timber, with the gains of the braces in such relation to the gains of the timbers that when the timbers of the chords are brought together they are combined and become, as it were, only one piece, no part of which can be operated upon or affected independently of the other by the downward and upward thrusts common to truss bridges, even if the bolt which passes laterally through and intersects each set of braces and the timbers of the chord were removed.
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What I do claim as my invention, and desire to secure by letters Patent, is— Providing each of the main and counter braces with two gains at top and bottom, and each of the timbers of the chord with a gain at the point where the braces are applied corresponding with the gains in the braces, and the
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Brown's patent claims did not actually address the economy afforded by lack of vertical members ("braces"). Instead he focused on the improved strength over previous trusses that had members ("braces" in his terminology) come to the horizontal chord near to each other but not exactly together (at
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The floor and roof are also trusses, but are horizontal and serve to give the truss rigidity. The bottoms of the diagonals tend to protrude below the sheathing. The Brown truss is noted for economy of materials as it can be built with very little metal.
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looking upward. Truss member ends can be seen protruding below sheathing. Very top of truss is visible above sheathing gap below roofline. This gap admitted light, making the bridge interior usable, if somewhat
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180:(the diagram shows these members, while the patent application diagram does not) but there are no vertical members in compression. In practice, when used in a
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underside, showing floor supports pinned to side (diagonal) truss members. Bottom of diagonal truss members protrude below the sheathing.
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The Brown truss enjoyed a brief period of favor in the 1860s, and is known to have been used in four covered bridges in
Michigan, the
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I do not claim broadly furnishing the main or counter braces with gains and passing them between the timbers of the chords;
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The truss ends are special, additional material may be present for rigidity or to protect the structure from snow. (
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interior showing diagonal members on sides and horizontal diagonal roof support, forming the top of the box truss
208:"gains" in his terminology), by having several members come together in the same place. From the patent text:
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136:. It is noted for its economical use of materials and is named after the inventor, Josiah Brown Jr., of
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utilizing a Brown Truss structure. Diagram, white members are tension elements and may not be present
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and one other. The design did not appear to gain wide acceptance as modern bridges tend to be
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connected to horizontal top and bottom stringers. There may be vertical or almost vertical
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constructed from battleship gun turrets and railway bridge trusses.
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Bottom of diagonal truss members interlock with floor (
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391:for bridges employing various truss types
500:"Ada Covered Bridge marker detail page"
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560:""TBUSS-BEIDGE JO SI AH BROWN" (sic)"
439:""TBUSS-BEIDGE JO SI AH BROWN" (sic)"
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257:Detail images from existing bridges
581:and hand corrected to match image.
530:"Whites Bridge marker detail page"
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413:West Michigan Tourist Association
172:) and consists of diagonal cross
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16:19th-century bridge truss design
536:. Michigan.org. Archived from
506:. Michigan.org. Archived from
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409:"White's Covered Bridge page"
470:Full-Text and Image Database
534:Michigan historical markers
504:Michigan historical markers
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373:The steerable frames of
31:Interior structure of a
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168:(as contrasted with a
597:Truss bridges by type
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160:The Brown truss is a
480:on December 20, 2016
444:Google Patent Search
203:for US Patent 17,722
148:it July 7, 1857, as
602:American inventions
174:compression members
47:, Kings Post Bridge
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325:Ada Covered Bridge
227:Ada Covered Bridge
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20:Brown Truss bridge
419:on April 28, 2007
359:Fallasburg Bridge
343:Fallasburg Bridge
270:Fallasburg Bridge
231:Fallasburg Bridge
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45:Truss bridge
568:. p. 2
275:Brown truss
156:Description
123:Brown truss
98:wood planks
72:Pedestrians
591:Categories
514:October 9,
396:References
170:deck truss
164:that is a
132:, used in
86:Span range
60:Descendant
253:trusses.
247:bowstring
162:box truss
150:US patent
76:livestock
383:See also
152:17,722.
146:patented
142:New York
94:Material
80:vehicles
41:Ancestor
607:Trusses
221:History
138:Buffalo
104:Movable
68:Carries
52:Related
251:Warren
229:, the
192:Patent
144:, who
127:bridge
115:medium
89:Medium
579:OCRed
329:dark.
243:Pratt
130:truss
574:2006
546:2006
516:2006
486:2006
452:2006
425:2006
273:, a
239:Howe
63:None
55:None
249:or
593::
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245:,
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121:A
107:No
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361:)
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
