Improvements in or connected with Built-up Sheets of Veneer.
Year: 1896

page_text: SIONAL SPECIFICATION.
Improvements in or connected with Built-up Sheets of Veneer.
I, CUTHBERT MCCALLUM, of No. 23, Saint Mary Axe, in the City of London,
Merchant, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in or connected with built-up sheets of
veneer, suitable to be employed for the manufacture of tubes and roofing, and for
other purposes.
The object of the present invention is, in a simple and economical manner, to
impart to a built-up sheet of veneer a considerably increased initial strength to
resist cross strains without materially increasing the weight of the sheet for a
given superficial area, or the number of thicknesses of veneer employed.
For this purpose, the compound or built-up sheet of veneer is softened or
rendered ductile in any suitable manner, either by the application thereto of the
uniting cement or glue or otherwise, after which it is corrugated, waved, or fluted
by any suitable means and caused or allowed to set.
The following is an example of a method that may be adopted in carrying the
invention into effect.
Two, three or more thicknesses of veneer are submitted to a process of steaming
in a suitable kiln, or, in some cases, are steeped in boiling water until the fibre of
the wood is softened and rendered ductile.
Two or more of these sheets having been coated upon their meeting faces with a
suitable cement, are then superposed one upon the other with the grain in different
directions, and in the case of three sheets, the outside sheets are, by preference,
arranged with the grain at right angles to the corrugations.
The several sheets are now passed through corrugated rollers or are passed
between suitable corrugated flat dies or are otherwise treated, in order to corrugate,
wave, or flute the entire surface of the compound sheet.
The compound sheet corrugated in the manner above described is preferably
placed between correspondingly corrugated plates or slabs of metal or other suitable
inaterial, so that it may be caused to assume the desired flat form in the dry state,
and these plates or slabs may be perforated to facilitate the evaporation of the water
contained in the compound sheets.
In some cases, in lieu of placing the corrugated compound sheet between flat
surfaces whilst setting, it may be placed in a form, consisting of two generally
cylindrical but corrugated parts, but the shape of the form might be varied accord-
ing to the result desired.
Compound sheets of veneer prepared in the manner herein before described may
be employed for a variety of useful purposes, and will be found to be exceedingly
light, and at the same time to possess very considerable strength to resist cross
strains.
Dated this 19th day of September 1896
VAUGHAN & SON,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in or connected with Built-up Sheets of Veneer.
I, CUTHBERT MCCALLUM, of No. 23, Saint Mary Axe, in the City of London,
Merchant, 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:-
My said invention relates to improvements in or connected with built up sheets
of veneer suitable to be employed in the manufacture of tubes and roofing and for
other purposes.
The object of the present invention is in a simple and economical manner to
impart to a built up sheet of veneer a considerably increased initial strength to
resist cross strains without materially increasing the weight of the sheet for a
given superficial area, or the number of thicknesses of vencer employed.
For this purpose, the sheets of veneer are softened or rendered ductile in any
suitable manner, either by the application thereto of the uniting cement or glue
or otherwise, after which the compound or built up sheet is corrugated, waved,
fluted or indented by any suitable means, and caused or allowed to set.
And, in order that the said invention may be clearly understood and readily
carried into effect, I will proceed, aided by the accompanying drawings, to give
some examples of methods that may be adopted in carrying the invention into effect.
Figure 1 represents a vertical transverse section taken on the line 1-1 of 2
Figure 2, of a pair of corrugated rollers showing a built up sheet of veneer passing
between the same.
Figure 2 is a vertical longitudinal section thereof taken on the line 2-2 of
Figure 1.
Figure 3 is a vertical transverse section taken on the line 3-3 of Figure 4, 2
representing a pair of rollers of modified shape designed to produce flutings instead
of corrugations.
Figure 4 is a vertical longitudinal section thereof taken on the line 4-4 of
Figure 3.
Figure 5 is a vertical transverse section taken on the line 5-5 of Figure 63
representing a generally flat form of corrugated die of peculiar construction adapted
to be employed in carrying out the invention.
Figure 6 is a vertical longitudinal section taken on the line 6-6 of Figure 5.
In the several figures like parts are indicated by similar letters of reference.
In carrying the invention into effect, two, three, or more thicknesses of veneer 3
are submitted to a process of steaming in a suitable kiln, or, in some cases, are
steeped in boiling water or are otherwise treated until the fibre of the wood is
sufficiently softened and render ductile, or are simply coated with the cement or
glue as hereinafter described which softens them to a sufficient extent.
Two or more of these sheets having been coated upon their meeting faces with a
suitable cement, are then superposed one upon the other with the grain in different
directions and in the case of three sheets the outside sheets are by preference
arranged with the grain at right angles to the corrugations, flutings, indentations,
or the like.
The sheets are now ready for corrugating or indenting, and according to the
method represented at Figures 1, and 2, the sheets a are passed between corrugated

page_text: rollers b, b, mounted in a suitable frame (not shown) and driven by any suitable
means, when the sheet will issue with the entire surface thereof corrugated in the
manner indicated by the part a* in Figure 1.
The sheet is then allowed to dry at the ordinary temperature of the atmosphere
or the drying may be hastened by placing the same in a chamber through which is
carried a volume of heated air, as will be readily understood.
or, the compound sheet a may be fluted instead of corrugated and for this pur-
pose it may be passed between a pair of rollers b, b1, such as those represented at
Figures 3 and 4, the upper roller being for this purpose formed with rounded
projections and the lower roller b' with corresponding recesses to produce the desired
result.
Or, the rollers may have any other suitable form given thereto in order to
break up the compound sheet by waves, undulations, ribs, projections or indenta-
tions having for their object to strengthen the same.
In lieu of passing the compound sheet between rollers as hereinbefore described,
it may if desired be placed between flat dies bbl, as represented at Figures 5 and 6,
with the same object the upper die being forced down upon the lower die by
hydraulic or other suitable power but in this case it is desirable, in order to avoid
an undue distension and possible fracture of the compound sheet a in pressing tho
same into the recesses of the die, to act upon a small surface only thereof at the
time and for this purpose the upper die 6 is made in sections as indicated in Figure
5, and the pressure is brought to hear upon each section in succession until the
entire surface of the sheet has been operated upon.
Instead of forming the corrugations, projections or the like over the entire
surface of the compound sheet the same may be formed with one or more of such
corrugations, projections, flutings, or the like and the size of such formation may
be varied according to circumstances.
Compound sheets of veneer prepared in the manner hereinbefore described
may be employed for a variety of useful purposes and will be found to be
exceedingly light and at the same time possess very considerable strength to resist
cross strains.
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:-
A compound or built up sheet composed of two or more thicknesses of veneer
rendered ductile by treatment with steam, hot water or otherwise, and coated with
cement and corrugated, waved, fluted or indented by rollers or other suitable means
and then caused or allowed to set, substantially as herein shown and described.
Dated this 19th day of June 1897.
VAUGHAN & SON,
Agents for the Applicant.