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Патент USA US2409786

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oct, 22, 194e.
Filed Jan. 7, 1944
Patented Oct. 22, F‘1946
David Newmark and William Kramer,
New York, N. Y.
Application January 7, 1944, Serial No. 517,456
1 Claim.
(Cl. 117_4)
This invention relates to slices of balsa wood,
slice therefrom, and showing the concavo-convex
either singly or in plies thereof, the method of
contour assumed by the slice in the cutting op
their production and the product thereof, pro
duced without waste of balsa material; also that
Fig. 2 is a side sectional View showing a curved
the product may present smooth, satinlike sur
slice of balsa in its passage between straightening
faces capable of having imposed thereon printed
rollers, over an adhesive delivering roller, and
or otherwise delineated designs as guides in cut
between hot, pressure rollers.
ting out toy or model configurations.
Fig. 3 is a section taken on the line 3-3 of Fig.
The usual method of producing balsa slices or
veneers is by sawing them from a block of that 10
Fig. 4 is a section taken on the line 4_4 of Fig.
material, but this results in considerable wastage
due to the thickness of the Saw and the relatively
Fig. 5 is a side sectional View, corresponding to
large amount of wood that is removed in the
2, but showing two slices of balsa being
form of sawdust.
formed into plywood by the hot, pressure rollers,
Knife slicing of balsa has been resorted to but
so far as is known to applicants the balsa has
Fig. 6 is a section on the line 6-6 of Fig. 5.
ñrst been subjected to a steaming process and
In said figures let I indicate a rectangular block
the slices are subsequently put through a drying
of balsa wood, showing a knife 2 angularly oper
operation. Such slices 0r Veneers are not em
ating in the act of severing slices 3 therefrom,
ployed by us in the present invention.
20 and showing that in such severing act the slice
By the instant method balsa slices and ply
assumes a concavo-convex contour, as indicated
wood veneers are sheared from a block of dry
in Fig. 3, the convex side having developed there
balsa, the thickness of the »blade causing the
on the crevices appearing in said figure. This
slices to curl outwardly away from the block, the
curved slice is now passed continually and pro
cut or convex surface of the slice being rough and 25 gressively `between the straightening rollers 4, 4,
besides having developed in the slicing operation
into a series of lengthwise interstices or crevices
at the convex side.
It is more economical to slice the balsa in a dry
and passes with its creviced side contactingly
over a roller 5 `that is journalled at 6 in a bath 1
of contained fluid resin, glue or other suitable
an upper roller 8 causing the slice to
state, but the consequent roughness of the slice 30 have frictional
contact with roller 5 in order that
surfaces renders the out slice unsuited to the pur
the adhesive may be applied to said creviced side;
poses for which it is intended. Therefore the
or the adhesive may be applied to both sides, in
curved slice is passed between rollers to straight
instance a container like that shown at I4
en it, then receives a coating of resin, glue or
in Fig. 5 may be added to apply the adhesive also
other adhesive, on the convex surface that had 35 on the upper side of slice 3. Thence the slice
developed the crevices, and finally is passed be
continues progressively to a series of heated,
tween heated. pressure rollers, having the effect
pressure rollers 9 and in its passage between pairs
of impregnating the substance of the slice with
of these rollers the adhesive becomes impreg
the adhesive and impartingr thereto smooth,
satin-like surfaces upon which desired delinea 40 nated in the slice of balsa whose surfaces through
the applied heat and pressure acquire a smooth,
tions can be imposed.
satin-like finish that renders the slice suitable
In producing balsa plywood by this method two
for the designated purposes of the invention.
cut slices of dry balsa are opposed at their con
In the example of the invention illustrated in
vex surfaces, straightened in the same manner
Figs. 5 and 6 two separate slices I 0, II of balsa
as with a single slice, given a coating of an ad
hesive on the inner surface of one or both of the
`are shown with their convex sides in opposition,
slices and then passed ‘between the hot, pressure
each slice being passed between separate pairs of
rollers as before.
rollers, respectively l2 and I3, to straighten them;
thence said slice I I appears as receiving on its
Obviously the balsa plywood may comprise any
desired number of slice plies.
creviced side a supply of an adhesive from a con
Other features and advantages of our inven
tainer I4, the slice being supported at this point
tion will hereinafter appear.
by a roller I5. Thenceforward the slices are re
In the drawing:
spectively guided by pairs of rollers I6, I‘I toward
Figure 1 is a perspective view of a block of balsa
a series of pairsv of heated and pressure rollers
Wood, showing a, knife in the act of cutting a 65 I8, and during the passage of these slices between
these pairs of rollers the slices are combined into
plywood and impregnated with the adhesive.
By the aforesaid method the plywood surfaces
acquire the same smooth, satin-like ñnish as in
the instance of the single balsa slices.
While we have designated balsa as the wood
to be treated in the manner hereinbefore set
forth, other “soft” woods, such for example as
bass, sugar pine, etc., may be included in the same
We claim:
The method of producing thin, straight, ñat
slices of balsa wood having smooth, satin-like
surfaces, for use in the manufacture of toy and
model articles, which consists in cutting said
slices from a dry block of balsa by verticaI knife
action, whereby each slice acquires a concavo
convex contour whereof the convex side has crev
ices developed therein, and then progressively
category, provided their characteristics enable 10 subjecting each slice, while continually moving,
to the following steps: ñrst passing each slice
them to respond to the treatment and thus ac
between rollers to straighten it, then passing each
quire the stated smooth, satin-like iinish capable
slice with its creviced side over an adhesive gath
of receiving imposed delineations for the desired
ering roller, and finally passing each slice be
Variations within the spirit and scope of our 15 tween heated pressure rollers.
invention are equally comprehended by the fore
going disclosure.
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