An Improved Nail or Wood Screw and Washer for Corrugated Roofing and the like.
Year: 1896

page_text: Date of Application, 10th Feb., 1896-Accepted, 28th Mar.. 1896
COMPLETE SPECIFICATION.
An Improved Nail or Wood Screw and Washer for Corrugated
Roofing and the like.
I, CLEMENT HUSK of 34 Butler Street Chorlton upon Medlock in the "City of
Manchester Commercial Traveller do hereby declare the nature of this invention
(which has been communicated to me from abroad by John Mitchell of Auckland
New Zealand Architect) and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :-
My invention has for its objects providing a nail and washer or guard for
effectually retaining sheets of corrugated metal and some other corrugated
materials used for covering roofs, walls &c. of buildings, and corrugated structures.
generally.
It is well known to architects and workers in corrugated material that there
have been numerous inventions for the securing of corrugated material, and that
many descriptions of nails have been invented for the purposes and especially lead
headed nails whereby an elastic head is produced and one which can be bedded
to the curve of the plates, also hard metal nails with elastic and spring washers
have been brought into use, but I have found that with most of these either the
heads of the nails are liable to come off, or they do not possess sufficient elasticity
to allow for the expansion and contraction of the corrugated plates.
Now by my present invention which I will now proceed to describe, I provide
a cheap and efficient nail and washer which possess great strength; make a joint
which is thoroughly watertight, and provide enough play to allow the disturbing
influences of vibration, expansion and contraction to take place without detriment
which is a great desirderatum in such fastenings.
My invention is illustrated on the accompanying sheet of drawings, similar letters
indicating similar parts.
Figure 1 is an elevation of my improved nail and washer as fixed in position
through a corrugated plate.
Figure 2 is a section of the same.
Figure 3 is an elevation looking down on the head of the nail and washer.
(a) is the corrugated plate which is pierced at (a¹) by the shank of the nail (b).
This nail (6) is intended to be made of wire galvanized (for cheapness) but may
be of any suitable hard metal. It has a solid head (61) undercut as shown at (6)
and flattened at the top, the former to provide a good covering and a means of
steadying the bossed up centre of the washer or guard (e), the latter to receive
the impact of a hammer without "skidding" off. The washer or guard (c) is to
be stamped out of stiff (say 22 gauge) sheet hard' metal preferably galvanized
iron. It is circular, oval or diamond shaped in outline as shewn in Figure 3
and curved transversely slightly quicker than the corrugations of the plates so as
to spring on to grip and lie closely thereto when drawn down by the nail. The
washer of guard is to be bossed up in the centre at (c) so as to elevate the point
of contact (2) with the nail and engage with the undercutting in the head thereof
in such a manner that whilst drift rain is excluded there shall be enough play
provided to allow the disturbing influences of vibration, expansion and con-
traction &c. to take place without detriment to the fixing as a whole.
"
The washer or guard being curved transversely will require no "after dressing"
or "adjusting" and being large in surface offers effective covering to the nail hole

page_text: and being at the same time stiff will save the corrugation from being dinted as
often happens with other fixings.
The nail and guard lie very snugly and being only slightly elevated will offer
little obstruction to drift rain and will not be damaged or disturbed by walking
or climbing on the roof.
The nails and washers or guards may if desired, be made of cast steel or any
suitable material and screws undercut similarly to the nails might in some cases
be made use of in place of nails.
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 fastening for corrugated material substantially as described herein and
illustrated.
Dated this 8th day of February 1896
CLEMENT HUSK.