Improvements in Extensible Bedsteads.
Year: 1899

page_text: Date of Application, 2nd Sept., 1899-Accepted, 7th Oct., 1899
COMPLETE SPECIFICATION.
Improvements in Extensible Bedsteads.
I, OTTO GÖRAN WAHLENBERG, Upholsterer, of 53, Mästersamuelsgatan, Stock-
holm, Kingdom of Sweden, do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:
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This invention relates to an improved arrangement of extensible bedsteads,
and consists in connecting the folding-mattress by means of arms or links with
the movable end or end-frame of the bedstead so that in unfolding or shutting
up the mattress the latter will move the bedstead-end out or in, the movements
mentioned, which have heretofore been performed separately, being consequently
accomplished in a single operation.
The drawing annexed shows in Figure 1 in full-drawn lines the bedstead in
its shut or pushed-in position and in dotted lines the extended position.
Figure 2 shows a modified arrangement.
The mattress, which as usual is provided at the middle with a joint, has the
portion a which is uppermost in the folded position connected with the end of
the bedstead 6 by means of linked arms c, one on each side. The arms c have a
length equal to about one half of that of the part a and are jointed at one end
to the sides of part a and at the other end to the posts of the sliding end b
of the bedstead at such a point that the arms occupy a nearly horizontal position
when the bedstead is shut. When the part a is lifted for opening the mattress
in the usual manner, it pushes the bedstead-end b outward by means of the
arms c. When the part a is fully unfolded, the arms c will have swung about
somewhat more than half a revolution and moved the bedstead-end into its ex-
tended position. When the mattress is being folded together, the arms in the
same manner serve to pull the bedstead-end 6 inward, so that when the mattress
is folded the aforesaid end will occupy its pushed-in position.
It is not necessary to attach the arms to the posts at any fixed point, since the
same action will be produced by providing the posts with longitudinal slots in
which the ends of the arms can slide. In this case, however, the arms should be
attached at the bottom edge of part a, which is shown upturned in Figure 1, as
indicated by dotted lines at g. In unfolding the part a the arms simultaneously
with pushing the bedstead-end outward gradually slide downwards along the
posts by their outer ends and finally stop in the dotted position gl. In folding
together the mattress the motion of the arms will be the reverse, i.e. they ascend
and finally occupy the position g. Figure 2 shows a transverse section of the
post provided with the slot mentioned, and the end of the arm sliding in it by
means of small rollers. The joint, however, for causing the arms to slide along
the posts can be made in various manners. It is evidently of no consequence to
the invention if the mattress be of such a kind as to be more properly termed a
bed-bottom

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
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I. In an extensible bedstead having a jointed mattress or bed bottom con-
necting one end of the mattress or bed bottom and one end of the bedstead by
links such as c substantially as described.
2. The combination of parts forming an extensible bedstead arranged and
operating substantially as described or as illustrated in the accompanying
drawings.
BOULT, WADE & KILBURN,
Agents for the Applicant.