Improvements in and relating to Nails.
Year: 1892

page_text: Date of Application, 8th Feb., 1892
Complete Specification Left, 16th June, 1892-Accepted, 16th July, 1892
PROVISIONAL SPECIFICATION.
Improvements in and relating to Nails.
I, GEORGE THOMPSON, of Hollybank, Bowling, Dumbartonshire, Joiner, do
hereby declare the nature of my invention to be as follows.
This invention has reference to and comprises a new or improved construction of
nail or nail head, and method of manufacturing same, specially suitable for securing
corrugated sheet metal as for roofing and like purposes, and whereby a water-tight
joint will be formed by the head of the nail over the part into which it is driven,
and be more simple and efficient than the washers or other securing fittings
heretofore in use.
The improvements consist in forming on the end of the usual iron wire or part
of the nail inserted into the woodwork a head of a new construction of lead or other
soft metal. This head is formed of a hollow conoidal or tapering shape on its under
or inner surface to bear on the ridge of the corrugated part over which the nail is
inserted; and the outer or top surface of the bead is preferably formed of a dome
shape. The end of the wire part of the nail is embedded or secured within the
hollow part of the head, and when the nail is driven through the corrugated sheets
into the woodwork the lower or hollow part of the head will spread over the
sheet metal and form a liquid-tight joint.
6
These improved nails are manufactured by taking a mould or die formed on its
inner or under surface of the same contour shape as the nail head to be made, and
rests at its lower part on a cress" preferably made of copper, of a convex shape
on top, and of the same contour as the under hollow surface of the nail head to
be formed. The end of the wire nail is inserted through a hole in the centre of
the cress and extends some distance into the hollow mould, while a hole is formed
in the top or centre part of this mould through which molten lead is run to embed
the end of the nail and form a head of a hollow dome shape after it has cooled and
solidified.
Dated the 6th February 1809
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to Nails.
I, GEORGE THOMPSON, of Hollybank, Bowling, Dumbartonshire, Joiner, do
hereby declare the nature of my invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement in writing, reference being had to the accompanying drawings
This invention has reference to and comprises a new or improved construction of
nail or nail head, specially suitable for securing corrugated sheet metal as for
roofing and like purposes, and whereby a water-tight joint will be formed by the
head of the nail over the part into which it is driven and be more simple
and efficient than the washers or other securing fittings heretofore in use.
And in order that my said invention may be properly understood, I have
hereunto appended an explanatory sheet of drawings in which
Figures 1 and 2 are an elevation and plan, and Figure 3 a sectional
elevation, corresponding to Figure 1, of a nail as formed in accordance with my
improvements.
Referring to these drawings.-The improvements consist in forming on the head
D

page_text: end of the usual iron wire stem or part of the nail a inserted into the woodwork, a
head a¹ of a new construction, of lead or other soft metal. This head a¹ is formed
of a hollow conoidal or tapering shape on its under or inner surface as shown in
Figure 3 to bear on the ridge of the corrugated part over which the nail is
inserted; and the outer or top surface a² of the head a' is preferably formed of a
solid dome shape. The end of the wire or stem part a of the nail is cast or embedded
within the upper part a² of the head a' and when the nail a is driven through the
corrugated sheets into the woodwork the lower or hollow part a' of the head will
spread over the sheet metal and form a liquid-tight joint.
The stems a of these improved nails may be screw threaded and the heads flattened
for being screwed into the wood work, or they may be made in the form of small metal
screw bolts with the improved heads a', a², and having the nuts on the inner side of the
sheet metal. These improved heads may be cast in brass, copper or other metal
moulds or otherwise affixed on to the stems a to form the nails or bolts, and these
moulds would have holes or "gates at their upper part through which the
molten lead would be run to embed the end of the nail stem a and form a head of
a hollow dome shape after being cooled and solidified.
وو
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is,―
Nails and the like having their heads formed of lead or other soft metal, of a
hollow conoidal or tapering shape on their under inner surface, and having the
stems embedded in the upper part of said heads, substantially as herein. described
in reference to and by way of application shown in the accompanying drawings.
T
1000
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.