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Патент USA US2130189

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SePt- 13, 1938.
Filed Sept. 15, 1957
[OM/4E0 5. LHWEENCE m/
550865 67‘. MGLm/GHL/N,
Patented’ Sept. 13, 1938
_ z_,13o,189 ,
Edward S. Lawrence and George G. McGlaughlin,
Mount Lebanon, Pa.
Application September 13, 1937, Serial No. 163,683
1 Claim. (Cl. 108-18)
This invention relates to metal sheet roo?ng
and the like, and particularly to an improved lap
joint for such sheets.
Heretofore, commercial roo?ng of the lap
5 seam type usually employed lapping edges hav
ing a sharp inverted V-shaped, longitudinally ex
tending, crimped edge for joining the adjacent
sheets together. While such roo?ng has been
commercially successful it does- have some bad
10 features, in that it provides a channeled surface
- which retains moisture and tends to hasten cor
rosion at the joint and, further, such a construc
tion often develops leaks around the nails that
are driven down through the sharp-edged crown
15 or vertex of both the lapping and lapped edges
to hold the joining edges together and the sheets
in place. Also, such nailing often, in penetrating
the metal of the crown of the ridges, resulted
in forming deep depressions in the metal or
20 caused excessive downward drawing of the metal
for the purpose of illustration, one embodiment
which our invention may assume in practice.
In'the drawing:
Figure 1 is a plan of a‘section of a roo?ng
sheet, showing the improved lap-joint of our 5
Figure 2 is a sectional view taken on the line
11-11 of Figure 1; and
Figure 3 is an enlarged cross-section, similar '
toFlgure 2 showing the improved lap-joint.
Metal roo?ng and the like is made in sheets
of a size that can be easily and conveniently
handled. Each of the sheets is usually the same,
having side edge portions which are adapted to
be joined ‘in overlapped relationship; and each 15
usually has a formed lapped-edge along one side
and a formed lapping edge along the other side
which is adapted to cooperate with the lapping
and lapped edges, respectively, of the adjacent
sheets to join them, as is well understood by those 20
around the nail, sometimes entirely deforming
the joint at that point and allowing leakage of
the joint, and, also, providing an excellent well
skilled in the art.
a sharp crown or vertex, as that of a V-shaped
upwardly extending main ridge 9 of substantial
It is to these lapped and lapping edges that
this invention relates. There .is shown in the
or retainer for water or moisture, thereby tend- _ drawing metal roo?ng sheets 5 and 6, having a
25 ing to hasten corrosion thereabout, in time allow
lapped-edge ‘i on one side of the sheet and a 25
ing the nail head to pull through the sheets.
lapping edge 8 on the opposite side.
Furthermore, when nails are driven into such
The lapped-edge consists of a longitudinally
crimp, they are di?lcult to center and often, after
30 entering the lapping edge, they are urged down
the inclined side of the lapped-edge between the
ly an inverted U-shaped cross~section having
downwardly diverging opposed ~side-walls I0 30
connected by an upwardly arcuated crown por
Sheets, thus failing to enter the crown of the tion II, which are yieldable relative to each
edge and the material to which they are to be
fastened which results in the sheets not being
35 fastened at that point; Such a condition also
tends to force the Joining edges apart ‘allow
iiig leakage along the joint.
In the present invention, these di?lculties have
n overcome by providing a lap-joint having
40 substantially a; wide upwardly arcuated crown
portion which will not retain moisture but rather
from which moisture and water will tend .to
other. These side-walisterminate in horizontal
?at portions I! which are disposed substantially.
in the plane of the body of the sheet. The hor- 35
lzontal ?at portion, toward the center of the
sheet, terminates in a second smaller longitudi
nally extending ridge H of substantially an in-, _
verted V-shaped cross-section having side-walls
H and IS, with the inner side-wall l5 of the 40
V-shaped ridge terminating in the plane and
body of the sheet. The other horizontal ?at por
tion'terminates in a longitudinally upwardly ex
It is an object of this invention to provide
45 roo?ng having a lap-joint which is inexpensive
tending angular ?anged edge It, preferably at
an angle of about 45 degrees.
to manufacture and easy to assemble, assuring
The lapping edge consists of a longitudinally
- a tight joint which is not subject to undue cor
. rosion, and, at the same time, possessing all the
v other qualities required of a good roo?ng.
upwardly extending ridge ll of substantially an
inverted U-shaped. cross-section which is sub-'
Various other objects and advantages of our
invention will more fully appear during the
course of the following speci?cation and will be
more particularly pointed out in the appended
In the accompanying drawing we have shown,
stantially larger than the main U-shaped ridge 9
of the lapped-edge and which is adapted to re- 50
ceive and house the same, and has downwardly
diverging opposed side-walls I8 and i9, ap
preciably shorter than ‘the side-walls l0, con
nected by an upwardly arcuated crown portion 2'
conforming to the crown portion I l of the lapped- 55
I 2
edge. These side-‘walla terminate in horizontally
disposed ?at portions Ii which are parallel to and
edges, each of said sheets having a lapped-edge
spaced from the horizontal ?at portions I! of the _ consisting of a longitudinally upwardly extending
lapped-edge. The horizontal ilat portion toward
mainridgeoisubstantiailyaninverted U-shaped
the center of the sheet terminates in a down
' cross-section, said ridge having diverging opposed
wardly angularly extending portion 22, which con
side-walls connected by an upwardly arcuated
tacts the end of the ?anged portion I‘ of the
lapped-edge at 23 on its underside, iinally ter
minating in the plane and body oi" the sheet.
10 The‘ other'horizontal ?at portion ii of the lap
ping edge terminates in a downwardly angularly
crown portion, each of said side-walls terminating
in horizontal ?at portions disposed substantially
in the plane of said sheet, the horizontal ilat por
tion toward the center of the sheet terminating in 10
a second smaller longitudinally extending ridge of
substantially an inverted V-shaped cross-section,
extending ‘?anged portion 24, contacting the out
side surface oi’ the inner side I! of the V-shaped the inner side of which terminates in the plane
and body of said sheet and the other horizontal
ridge it of the lapped-edge, which ?nally ter
?at portionterminating in a longitudinally up ll
wardly extending angular ?anged edge, and a
the plane of the sheet.
There is provided on the outer and topmost lapping edge consisting of a longitudinally up
central portion of the arcuated crown 2| of the wardly extending overlapping ridge of substan
tially an inverted usshaped cross-section for re
U-shaped ridge of the lapping edge I, prede
termined spaced indentations 2' which tend to ceiving the top of the U-shaped ridge of the
guide and center the point of nails through the lapped-edge, said ridge of the lapping edge having .
crown portion of the ridges and the metal of the diverging opposed side-walls connected by an up
wardly arcuated crown portion conforming to
It will be noted that the U-shaped ridge of the the arcuated crown of the U-shaped ridge of the
lapping edge is substantially larger than the lapped-edge, said side-walls being spaced farther
U-shaped ridge of the lapped-edge which allows ‘apart than the side-walls oi the U-shaped ridge
the yieldable side-walls ll of lapped-edge, when of the lapped-edge and each terminating in hori
nailed or fastened, to spring apart or yield until zontally disposed ?at portions spaced from and
they contact the lower terminating edges of the substantially parallel to the horizontal ?at por- side-walls II and it oi’ the U-shaped ridge of the tions of the lapped-edge, one of the horizontal ?at
portions oi’ the lapping edge terminating in a
lapping edge. ' Such a construction allows for
excess nailing and eliminates buckling of the downwardly angularly extending portion contact
edges, as often happens to such edges which are ing the extreme edge of the angular ?ange of the
lapped-edge on its underside and terminating in
not constructed according to this invention.
the plane and body of the sheet, and the other
horizontal ?at portion terminating in- a down
shown and described an embodiment of our in
vention, it will be understood that this is merely wardly angularly extending ?anged portion con
the said 'inner side of the inverted
for the purpose oi’ illustration‘ and description tacting
and that various other forms may be devised V-shaped ridge of’ the lapped member and finally
terminating in a turned edge substantially in the
40 within the scope of our invention, as deiined in plane of the sheet.
the appended claim.
We claim:
A lap-joint for roofing and the like comprising
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