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Патент USA US2133108

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Filed Jan. 26, 1938
Patented Oct. 11,1938
I ‘
Robert A. Muller. Wellesley, Mass” assignor to
Atlas Plywood Corporation, Boston,v Mass” a '
corporation ot'Massaohnsetts
Application James, 193a,‘ Serial Names
(cl. 2H1)
This invention relates to plywood sheets .and_ .
been taken away.‘
' abstain-1mm .
shoulde'rs,_ such as those'shown at a vaudib', are
to methods of making products 01 this character
for special purposes.
~ ‘
- ,formed at the 'junction ‘of the reduced margin '7 .
with the main body ‘oi’ the sheet; One-0r both - '_
5 wood are such that there are fairly de?nite lim_-' ’ of these marginal areas/next is coated "with-an 5
its to’ the sizes of the sheets of _ plywood which "adhesive" cand, while such coating-is ‘still moist
. The commercial methods ‘ of producing Ply.
can be manuiactured economically. For most
purposes the dimensions or these sheets are am;
pic, but occasionally situations arise which ,call
30 for sheets oi considerably larger sizes. A typi
cal instance is in the crating of automobiles and
machines for foreign shipment. . While such
sheets or panels can be produced by obtaining
special equipment to accommodate these larger
15 sizes, the expenditure involved is not warranted
by the relatively limited demand for them. i
and.tacky, the two margins are overlapped; one
upon the other; in the relationship, shown'swith
the edge of each sheet abutte ‘ against the;
shoulder of the other sheet.‘ hwi'th
e sheets-held m
in this relationship a series of hi alliofastenr '
ers are driven throughthe'~ overlapped areas to
secure them ?rmly together. after which-the;
sheets are stacked in racks,"o“r any ‘other suit
ablev manner, while the ‘adhesive
Prefer- 13 '
ably the fastening of the sheets is ‘accomplished
The present invention deals with the problem .by driving two rows of staples 4 and 5 along-the .‘
presented by these conditions. It aims to devise joints between‘ the edges of the marginal strips
a plywood sheet structure and a method‘ of . and'the shoulders against which they abut, the \
‘ 2g joining plywood sheets with a view to producing
exceptionally large sheets or panels while avoid
ing the necessity for using expensive special
The nature of the invention will be readily
staples straddling the joints and being clinched '20‘
at the opposite side. of the composite sheet. A
multiplicity oi’ other staples, such-as those shown
at 6", are driven through both-oi the overlapped ‘
strips- and clinched, the staples being either ar
25 understood from the following description when
ranged in a row about midway between the two
read in connection with ‘the accompanying draw
ing. and the novel features will be particularly
pointed out in the appended claims.
other manner necessary to cooperate with the
In the drawing,
Figure 1 is aperspective view of .a portion of
a plywood sheet embodying the present inven
latter in mechanically securing the entire areas
of both sheets together. Naturallythe distribu
tion of these staples and their spacing from ‘each 39
other willdepend upon the requirements oilin
dlvidual situations.
Fig. 2 is a vertical, sectional view approxi
mately on the line 1-2, Fig; 1; and
35 Fig. 3 is a disassembled perspective view of
the invention. ‘_ I
rows of staples 4 and 5,.or else distribued inany
'- '. The construction shown in the drawing com
prises two'sheets or sections 2 and 3, respective
" ly, of plywood which may be ‘composed of any
40 desired number oi‘ plies. These sheets may be
made up in standard dimensions and of the
usual constructions, the grain in adjacent plies
running at right angles to each other. The mar
_ gins of these two plywood sheets are reduced in
45' thlcmess to-substantiallyzone-hali that of the
main portions of the‘ sheets,-and these relative
ly thin marginal strips are overlapped upon each
The construction above described produces a
composite sheet composed of the sections 2 and
3 with the overlapped joint madein themanner '35
just mentioned. It has been found‘ in practice.
that this ‘joint‘is practically as strong as a cor? ; I
. responding section of either of» the main sheets
2 or 3. The overlapped areas, however, should.
be ample to give the desired strength and rigidi-r4o ~'
ty, a typical width of each of the reducedstrips
being'from three inches to‘ live inches. The fact
that the staples straddle‘ theiedges- of thestrips '
which abut against the'shoulders a and .b is
important in contributingto the strength-oi the 45 union between the sheets'.-
'An important‘ advantage of this process. is
other, asv clearly illustrated. For convenience in - that by assembling the sheets in the‘ ‘manner
manufacture, the sheets may ‘be initially pro
' 50 duced in the usual manner, and the thin mar
ginal strips subsequently are formed by rlmning
these portions of the sheets through a scarling
‘5* or planing machine which‘removes the surplus
‘material and forms substantially smooth ?at
5 surfaces on the area from which the stock has
‘above described while the'adhesive between the
overlapped areas is still soft and tacky,v and then ‘50
driving and clinching the staples'or other iasten- '
ers, ample pressure can be applied by them to
the glued joint to'hold the parts rl8ld1¥ in‘ their
?nal positions while'the glue sets. .‘ Thus. the
necessity for compressing, the joined areas of 55 -‘
the slicéts‘in'a: hydraulic or other press is avoid
ed. This is important from the standpoint of
-manufacturing expense for the reason that it
junction of said reduced strip with the body of
the sheet, and rows of staples straddling the re
spective joints between each of said shoulders
avoids the necessity of using special equipment and
the adjacent edge of the other sheet, said
not customarily employed in a plywood plant, ' staples
being clinched upon the faces of said
and it reduces the handling expense which would ‘ sheets opposite to said respective Joints.
be involved if it were necessary to use a plywood
2.,An article of the character described, com
prising two plywood sheets; each having a margi
The common "hardwood plywood sheets or
10 panels are customarily made in sizes up, to 4x '7 nal stripthereof of approximately one-half the
thickness of the main body of the sheet, said
feet. By joining these or smaller panels in the strips being of great width in proportion to their
manner above described, it is entirely feasible to thickness and each being overlapped upon the
produce very much larger sheets, and to accom
other, with its edge 'abutted against a shoulder
plish this result very ecohomically.
formed ‘at the junction of the reduced margin
In crating machines, automobiles, and‘the like, with the main body of the other sheet, whereby
for foreign shipment, it is often desirable to use a joint is formed between each of said shoulders
a plywood which has been waterproofed. These and
the edge abutting against it, a row of staples
sheets can be united in the manner above de- straddling each of said joints, and clinched upon
scribed and the joint can be made waterproof by the opposite sides of the respective sheets, and a
20 using a glue or cement‘which is either waterproof
plurality of additional staples driven through the
or not, as desired, but which, in any event, is overlapped portions of said strips ‘and securing
compatible with ‘the material used in waterproof
said strips together in face to face relationship.
ing the board.
3. An article of the character described, comWhile I have herein shown and described a prising
two plywood sheets, each provided with a
25 typical‘ embodiment of my invention, it will be
understood that minor departures may be made ,, marginal strip of substantially uniform thickness
overlapped upon a similar margin of the other
from this disclosure within‘ the spirit‘and scope . sheet,
both of‘ said margins being of reduced
of the invention.
thickness compared with that of the adjacent
Having thus described my invention, what I de
portions of the sheet, and the extreme edge of
30 sirev to claim as new is:
each of said reduced strips being abutted against
lcAn article of the character described, com
prising two plywood sheets, each provided with a a shoulder on the other sheet formed at the junc
tion of said reduced strip with, the body of'the
marginallstrip of substantially uniform thickness sheet,
rows of staples straddling the respective
overlapped upon a similar margin of the other
each of said shoulders and the, ad
sheet, both of said margins being of reduced
thickness compared with that of the adjacent jacent edge of the other sheet, said staples being
portions of the sheet, and the extreme edge of clinched upon the faces of said'sheets opposite
said joints, and a coating of adhesive between
each of said reduced strips being abutted against to
the marginal strips.
a shoulder on' the other sheet formed at the '
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