Improvements in or relating to the Attachment of Corrugated Iron Sheets to Roof Purlins.
Year: 1899

page_text: Date of Application, 12th Oct., 1899-Accepted, 13th Jan., 1900
COMPLETE SPECIFICATION.
Improvements in or relating to the Attachment of Corrugated Iron
Sheets to Roof Purlins.
We, CHARLES HOWARD WINDLE, of Strand Road, Calcutta, in British India,
Deputy Traffic Manager of the Calcutta Port Trust, and BASIL DEVENISH MEARES,
of Strand Road, Calcutta aforesaid, Civil Engineer, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement:-
The invention consists of an improved method of attaching corrugated iron
sheeting to roof purlins by means of a hook of wrought iron (or other suitable
material) of the pattern shewn in Figures 1, 2 and 3 of the accompanying draw-
ings such method being designed to obviate the necessity of puncturing the.
sheeting for the insertion of the ordinary hook bolt or rivet (whereby it has
hitherto been necessary to attach the sheeting to the purlin) and so to prevent
the leakage which occurs from such puncturing. Such method also secures other
advantages and conveniences as hereinafter appears.
Of the said accompanying drawings-
Figure I represents the side elevation of the hook as it will appear when in
position.
Figure II represents the front elevation of the shank of the hook as it will
appear when bolted on to the purlin.
Figure III represents a cross section of a roof with the sheets of corrugated
iron fastened down by means of the invention.
The same letters of the alphabet are used to indicate the same parts in each
of the said drawings.
The hook is of wrought iron (or other suitable material) with round parallel
arms (A in Figure 2 and A and B in Figures 1 and 3) of a length usually of
about four inches and of a diameter or thickness proportionate to the weight
of the sheeting to be used and with a flat shank (C in Figures 1, 2 and 3) at
right angles to the arms such shank being usually about three inches in length
and one and one half inches in breadth and of a thickness sufficiently corre-
sponding to that of the arms of the hook. A hole is drilled in the centre of the
shank as shewn in Figure 2 to admit of the insertion of a half inch bolt whereby
the shank can be firmly fastened to the purlin in the manner and position shewn
in Figures 1 and 3.
By these means the lower edge of each piece of sheeting (meaning by "lower
edge" the edge at that end of the piece of sheeting which looks downwards
towards the eaves of the roof) is gripped between the parallel arms A and B
of one of the hooks while the upper edge of each piece of sheeting (meaning
by upper edge" the edge at that end of the piece of sheeting which looks
upwards towards the apex or ridge of the roof) is gripped between the lower
arm of another of the hooks and the purlin as shewn in Figure 3 the lower edge
of the piece of sheeting which starts from the apex of the roof overlapping the
upper edge of the piece of sheeting next below and the last mentioned piece of

page_text: sheeting similarly overlapping its neighbour next below and so on till the sheeting
reaches the eaves of the roof.
The respective widths of the spaces between the two arms of the hook and
between the lower arm of the hook and the purlin vary according to the thickness
of the sheeting to be used. These two spaces are shewn as to both of them in
Figures 1 and 3 and as to the latter of them (the space between the lower arm
of the hook and the purlin) in Figure 2.
$6
To avoid all possibility of wind or water entering the space between an upper
and a lower piece of sheeting when they overlap at the hooks attached to the
purlins a strip of felt or other suitable material or substance is inserted between
the lower edge of the upper piece of sheeting and the upper edge of the lower
piece of sheeting immediately below it. By an upper" piece of sheeting we
mean a piece which in relation to its immediately next neighbour below it is
nearer the apex of the roof than such neighbour. By a "lower" piece of sheeting
we mean a piece which in relation to its immediately next neighbour above it is
nearer to the eaves than such neighbour.
The chief advantages arising from the invention are:-
(a) The initial cost of erecting a corrugated iron roof or shed is minimised in
that no rivets or wind ties are required.
(6) There is considerable saving of time and labour in erecting a roof or shed
by means of this invention.
(c) The roof or shed can be taken down and re-erected with despatch and with-
out cutting the sheeting.
(d) Leakage is prevented inasmuch as no holes in the sheeting are necessary.
(e) Defective sheets can be replaced and changed by merely unbolting the hooks
whereby the lower edges of such sheets are kept in position without removing
the other sheets.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
(1) The hook and shank of the pattern or form herein described and applied
to the purposes aforesaid.
(2) The method substantially as herein described of fixing the hook to the
purlin for the purposes aforesaid.
(3) The method substantially as herein described of utilising that portion
of the purlin which is parellel with the arms of the hook so as to admit of the
insertion of the upper edge of a lower piece of sheeting between the purlin and
the lower arm of the hook.
(4) The method substantially as herein described of keeping the sheeting in
position by inserting the upper edge of a lower piece of sheeting between the
hook and the purlin and gripping the lower edge of an upper piece of sheeting
between the arms of the hook.
(5) The combined form construction and position of the hook substantially
as herein described and the creation thereby of an efficient means of fastening
corrugated iron sheeting to roof purlins.
Dated this Twelfth day of October 1899.
SANDERSON, ADKIN & LEE,
46, Queen Victoria Street, London, E.C.,
Agents for the Applicants.