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Патент USA US2412523

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‘ Dec. 10, 1946.
'
'c. B. LUNDSTROM
2,412,523
METHOD OF PRODUCING WOODEN ARTICLES OF CIRCULAR CROSS SECTION
AND VARYING DIAMETER AND THE RESULTING ARTICLE
Filed Nov. 28, 1944
7
Fiel
FiG.3
3nventor
attorneys
Patented Dec. 19, 194-6
2,412,523
UNITED STATES PATENT OFFICE
2,412,523
METHOD OF PRODUCING VJOODEN ARTI
CLES OF CIRCULAR CROSS SECTION AND
VARYING DIAMETER, AND THE RESULT
IN G ARTICLE
Carl Brynolf Lundstrom, Little Falls, N. Y.
Application November 28, 1944, Serial No. 565,542
2 Claims. (Cl. 20-—0.5)
1
2
This invention relates to a method of producing
vertically in the corresponding end frames 5 and
slender wooden articles and the resulting article.
The conventional way of producing slender
i5. Thus the two lower ones of the rolls 1 turn on
?xed axes and the third roll ‘I is moved toward
and from the other two. Each of these rolls has
wooden articles which are circular in cross sec
) tion and which have varying diameters through
out their length is to turn them in a lathe. Typ
ical examples are the spindles used in chairs and
other pieces of furniture. As a consequence, an
article so turned is weakest in its small section.
The invention produces a similar article which is 10
knurled end portions 8. Any or all of the three
rolls may be driven, but it is more convenient
to drive one or both of the lower two.
The con
?guration of all the rolls is the same.
Assume that it is desired to produce a spindle
such as that shown in Figure 3 which has a cen
nearly indistinguishable from a similar turned
tral enlargement A and end portions B of ap
article and which nevertheless is quite strong in
proximately the same diameter as said central
its slender sections, at any rate, very much
enlargement and intermediate slenderer portions
stronger than a similar turned article would be.
‘C. In such case the rolls would all be formed as
The following invention is vintended particu~ 15 is the top roll, clearly visible in Figure 2.
larly for the manufacture of furniture compo
To produce the densi?ed spindle a cylindrical
nents. It may be used in the manufacture of
blank whose outline is indicated in dotted lines at
any wooden article which is circular in cross sec
13 in Figure 3 is plasticized and then placed be
tion and of varying diameter. It affords particu
tween the rolls with the top roll in its elevated
larly desirable results under conditions requiring 20 position. The plasticizing operation may, if de
good mechanical strength.
sired, include the step of heating the blank. The
It is well known that wood may be plasticized
rolls are suitably heated, and while they are be
by impregnating it with urea or thio-urea or a
ing rotated, the top roll is slowly moved down
mixture thereof and may then be densi?ed by
ward The e?ect is to densify the wood of the
compressing it transversely to the grain in heated 25 blank in varying degrees according to the con
dies (see the patents to Loughborough 2,298,017,
?guration oi the three forming rolls. The
October 6, 1942, and 2,313,953 March 6, 1943).
knurled portions 8 on the rolls will serve to drive
With certain woods, water if present in proper
the blank from the driven roll or rolls and will
quantity will serve as a plasticizer.
The present invention produces slender compo
nents by plasticizing a suitably dimensioned
slender blank and then variably densifying the
blank by transverse compression to produce the
30
ensure rotation of any idle roll.
Since the invention is concerned with the gen
eral principle or method, and the resulting article,
no attempt has been made to elaborate the de
tails of the roll stand. Axial rolling is a known
desired varying cross section. In consequence
procedure in other arts and the roll stand itself
the slenderest sections are the most densi?ed and 35 is not claimed in the present application.
hence the strongest, a novel and valuable at
What is claimed is:
tribute. If the variations in dimension of the
v1. The method of producing a wooden article
?nished spindle exceed what can be attained by
of the type described which comprises plasticizing
varying the densi?cation, the blank may be
a slender Wooden blank in which the grain of the
formed to relieve the excess.
40 wood runs longitudinally, and then axially rolling
The invention will now be described as used in
said blank between heated forming rolls which
the formation of a spindle, reference being made
are of similarly varying longitudinal contour,
to the accompanying drawing, in which—
and are caused to approach each other gradually
Figure 1 is an end elevation of the roll struc
during the rolling operation whereby the blank
ture.
45 is densi?ed in varying degrees at di?erent points
Figure 2 is a section on the line 2-2 of Fig
ure 1.
in its length and becomes set as a solid of revolu
tion of varying, cross section in which the degree
of densi?cation varies in inverse relation to the
Figure 3 is a view of the ?nished spindle made
in the rolls of Figures 1 and 2, the outline of the
cross section.
blank from which it was formed being indicated 50
2. A densi?ed wood article of the type de
in dotted lines.
scribed, in which the article is a slender solid of
The spindle is formed by axial rolling and a
revolution of varying cross section, the wood
typical roll stand is indicated in Figures 1 and 2.
grain runs longitudinally, and the densi?cation
This stand has two end frames 5 and 6 in which
is evidenced by radial condensation of the grain,
are journaled two of three identical forming rolls 55 said densi?cation varying in inverse relation to
1. The third of the three rolls 1 is journaled at
the cross section.
its ends in two frames I l and [2 which are guided
CARL' BRYNOLF LUNDSTROM.
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