IMPROVEMENTS IN THE MODE OF CONSTRUCTING GIRDERS AND OTHER PARTS OF BRIDGES, AND BEAMS AND GIRDERS AND OTHER PARTS IN OTHER STRUCTURES AND SUPERSTRUCTURES, PARTS OF SUCH IM- PROVEMENTS BEING APPLICABLE. TO SPRING BOTTOMS FOR BEDSTEADS, MATTRESSES, SOFAS, OR OTHER ARTICLES
Year: 1868

page_text: PROVISIONAL SPECIFICATION left by Ormurod Coffeen Evans at the
Office of the Commissioners of Patents, with his Petition, on the
11th September 1868.
I; ORMROD COFFEEN EVANS, Citizen of the United States of America,
at present residing at Lambeth, in the County of Surrey, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN THE MODE
OF CONSTRUCTING GIRDERS AND OTHER PARTS OF BRIDGES, AND BEAMS AND GIRDERS
AND OTHER PARTS IN OTHER STRUCTURES AND SUPERSTRUCTURES, PARTS OF SUCH IM-
PROVEMENTS BEING APPLICABLE. TO SPRING BOTTOMS FOR BEDSTEADS, MATTRESSES,
SOFAS, OR OTHER ARTICLES," to be as follows:-
The Invention consists, first, in forming and uniting in a chain
alternately a square or oblong with two half or connecting links (which
are hook links) made of round, square, or flat bar iron or steel. A hook
at each end of each half link is formed at right angle with the bar in
such manner that when inserted from underneath the end bar of the
open link the hook from the inside will rest on the side bar of the open
link, and the end bar of the open link on the bar of the half link, if both.

page_text: are brought within the same curve or planc. Ech pair of half or
connecting links to be self-sustaining may be united in one by a cross
bar, or they may be made to cross each other in the middle and at right
angle, so as to hook into the square or open links at opposite corners, in
which case, as now, the hooks will be turned up at right angle, but
laterally set at an angle of 45° instead of at right angle. In this
arrangement of parts, be it curved or straight, the chain is rigid, but
this degree of rigidity is greatly increased by interlocking from the
under side or in compression in succession a scries of straining rods;
these rods at each end have formed on them a hook which grasps, from
the in and under sido the top side of the side bar of a square or open
link, and the other the side bar in like manner of a third, fourth, fifth,
or tenth in remove square or open link; and the strut stanchions are
erected one under the side bar of each square or open link (which is
every other link in the chain) and rests, from this mode of arranging
them, on two and sometimes more straining rods at the same time.. This
arrangement of trussing is added to both sides of the chain alike, and
the strut stanchions instead of being single are double, or two in one,
made in form and arranged across the chain, or transversely, with the
open end up, and this for the purpose of locking together laterally the
straining rods of both sides. From the flexibility of this trussed chain
opposite the top or rigid side in forming it all the minor parts are easily
locked together and as casily unlocked when occasion requires. In this
manner are formed compound trussed chain girders for bridges, either
permanent or temporary, or any place or structure or superstructure
where girders or beams are required to be used, and which,, whether
straight or arched, are self supporting, and as strong or stronger perhaps.
than an equal amount of material can be made when put together in a
different way. This method of trussing chains may be quite as advan-
tageously employed in contention in some cases as it is in compression
in this. This chain without the compound trussing may be used for
the same or similar purposes where a less amount of rigid strength is
required; as also, by varying the form of the links and using some
elastic and light material, it may be used in the construction of spring
bottoms for bedsteads, mattresses, sofas, chairs, or other articles; for
these purposes the links are all made the same form and locked one
into the other in the same way the square and hook links are united,
previously described. One of these chains, long or short as may be

page_text: required, is attached at each end of a frame made of lath or other suitable.
material, and which together with the chains. is, made long enough to.
reach from side to side or end to end of the bedstead or other article,.
and allow the end of each chain to rest on the side or end rail of the
same, where it is securely fastened.