Improvements in Roof-coverings.
Year: 1890

page_text: Date of Application, 4th Feb., 1890
Complete Specification Left, 4th Nov., 1890--Accepted, 6th Dec., 1890
PROVISIONAL SPECIFICATION.
Improvements in Roof-coverings.
We, JOSEF DREXLER and ANTON DREXLER both of 11, Weissgärber-Strasse,
Vienna Ill, in the Empire of Austria, Architects, do hereby declare the nature of this
invention to be as follows:-
This invention relates to sheet metal roof coverings, and has for its object to provide
a roof covering of handsome appearance which is at once rain-proof, very resistant
against storms, and easy to fix.
Narrow
According to the invention, the roof covering is formed of polygonal sheet metal
plates so fixed to the lathing as to present a corner at top, the attaching to the roof
being performed by means of a strip of sheet metal inserted under a flap formed at the
upper corner of the plate and folding against the front surface of the same.
marginal strips, along the edges of the upper half of the polygonal sheet metal plate,
are folded against the upper side and similarly the edges of the lower half are folded
against the lower side of the plate, the corners of the plate having been first cut-off to
such an extent as to avoid overlapping.
One of these plates having been fixed to the lathing by nailing thereto, the sheet
metal staip inserted below the top corner flap the two plates to be arranged on either
side of, and above, the already fixed one have their downwardly-folded edges
engaged beneath the upwardly-folded edges of the fixed plate; afterwards a fourth
plate is placed with its lowermost corner over the top corner of the fixed plate and
with its downwardly folded margins on either side of the said lowermost corner
engaged beneath the upwardly folded top margins of the two lateral plates, and so on,
as will be readily understood.
Dated this 4th day of February 1890.
COMPLETE SPECIFICATION.
Improvements in Roof-coverings.
We, JOSEF DREXLER and ANTON DREXLER, both of 11, Weissgärber-Strasse,
Vienna III, in the Empire of Austria, Architects, 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 :-
This invention relates to an improved roof covering consisting of metal plates of
regular shape-preferably of square or rhombic shape-two edges of each plate being
folded or doubled on itself along the upper surface and the other two on the under
surface of the plate and having the upper corner bent over so as to form a flap. By
means of the folded edges, adjacent plates are interlocked with each other and by
means of a metal strip inserted under the top corner flap, each plate is fastened to the
lathing of the roof whereby a solidly-connected water, fire, and weather, proof roof
covering is obtained.
In the annexed drawings,
Figure 1 shews the form of the metal plate before the edges are folded ;
Figure 2 represents the same plate with folded margins or edges;

page_text: Figure 4 shews, on a larger scale, the suspension flap at the upper corner of the
unfolded plate shewn in Figure 1;
Figure 5 shews the top corner of the plate after the edges and the suspension flap
are folded and a metal strip, for fastening the plate to the roof lathing, inserted
beneath said flap:
Figures 6 and 7 respectively represent, also on a larger scale, the mode in which
three and four covering plates interlock with each other."
The metal plates employed for making the improved roof covering have the side
and bottom corners cut off, as shewn in Figure 1, whilst at either side of the top
corner at distances from the angle equal to double the width of the intended folded
margin are made notches in directions perpendicular to the respective edges. The
edges of the plates are so folded that the marginal strips on the two upper edges are
folded on to the upper face of the plate whilst those of the two lowermost edges aro
bent over on to the underside of the plate. The upper marginal strips a a¹ are pre-
ferably made somewhat broader than the lower ones and the suspension flap d formed
of the top corner of the plate is folded over the top ends of the upper marginal strips,
as shewn in Figure 5. Between the top ends of the upper marginal strips a a' and
the suspension flap d a metal strip bis inserted which is fastened by means of barbed
nails ec to the lathing or boarding of the roof whereby the plate is fixed in its proper
position. The interlocking of adjacent plates is effected as shewn in Figures 6 and 7
wherein the lowermost plate A is first secured to the lathing by means of the fastening
strip whereupon one of the lower marginal folded strips of each of the two upper
plates B B is hooked beneath the upper marginal folded strips of the plate A, the
plates B B being fastened to the lathing by a strip and the suspension flap d of the
said plate covering the ends of the upper marginal strips of the plates B B₁, as shewn
in Figure 6, which renders the covering quite water-tight. When the plate of the
next course above is to be fastened, the lower marginal strips of this plate Care
hooked beneath the upper marginal strips of the plates B B and also beneath the
lower edges of the suspension flap d of the plate A so that the bottom corner of
the plate overlaps the joint of the plates A, B B', and tightly covers the same, as in
Figure 7; the plate C being finally secured to the lathing by means of a fastening
strip b, as described with reference to plate A.
b
0
In this manner each of the plates is securely fastened to the lathing at all four
corners, although only one fastening strip is required for each plate. The roof
covering thus formed is perfectly rain-proof and cannot be stripped by storms. The
slight difference of the breadth of the upper and lower marginal strips of the plates
permits a slight movement of the plates towards each other, consequent on changes of
temperature, without in the least impairing the solidity and impermeability of the
entire roof covering. The plates can be made of any metal whatever and may be
'provided with ornaments or with ribs for increasing their strength and durability.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is ;-
1. Metal plates for roof covering, of square or rhombic shape, having two adjacent
edges folded over upon one face of the plate and the other two edges folded over on to
the other face of the plate and a corner flap folded over upon the same face as are the
two adjacent marginal strips so that the plate can be easily secured to the roof lathing
by means of a strip inserted between the suspension flap and the adjacent folded
marginal strips, substantially as shewn and described.
2. In a roof covering, composed of metal plates formed as described, the com-
bination, with folded marginal strips on the edges of the plate and with a suspension
flap on the upper corner of the plate, for connecting the plates with each other, of
metal strips inserted between the marginal strips and the suspension flaps, for
securing the plates to the lathing of the roof, substantially as shewn and described.
3. Constructing roof coverings, by connecting together metal plates formed as

page_text: indicated in claim 1 substantially as described and represented in Figures 6 and 7 and
for the purpose specified.
D
11. 1200
J. DREXLER.
A. DREXLER.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.