Improvements in the Manufacture of Picture Nails.
Year: 1899

page_text: Date of Application, 5th May, 1899-Accepted, 10th June, 1899
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Picture Nails.
I, FREDERICK WILLIAM NICHOLLS, of 45, Aston Brook Street, in the City of
Birmingham, Stamper and Piercer, 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 has reference to the manufacture of those picture nails in which
the ornamental head is made to screw on to the shank and this invention con-
sists in making the ornamental heads of the said nails from sheet metal in the
ways herein described whereby I obtain a cheap ornamental head which effectually
covers the screw end of the nail shank when the head is screwed therein.
I will describe my invention by referring to the accompanying drawings on
which Fig. 1 is a sectional plan of a picture nail constructed according to this
invention; Fig. 2 is an end view of the head of the said nail looking from the
underside of the same; Fig. 3 is a general inverted view of a part of the said head
and Fig. 4 is a general view of the other part of the same; Fig. 5 is a sectional
plan of part of a picture nail with the head constructed according to a modification
of this invention; Fig. 6 is a cross section of a raised circular blank being one stage
in the manufacture of the picture nail head represented in Fig. 5; Fig. 7 shews
the same blank as Fig. 6 in the next stage, and Fig. 8 shews the same blank in
the next stage and also the dies which operate on the same.
The same letters of reference indicate the same or corresponding parts in all
the figures.
I will first describe the arrangement of my invention illustrated by Figs. 1 to 4.
In this arrangement of my invention the stamped sheet metal ornamental
head A of the picture nail, which is made with a central screw threaded hole a¹
to screw on to the shank B, is provided with a central dome shaped part C (shewn
separately by Fig. 4) to cover the end of the shank B which projects through the
hole a¹. This dome shaped part C is made separate from the head A and is raised
from sheet metal and fixed to the head by being formed with two tongues el c
which pass through corresponding slots a a³ in the head A and are clenched over
at the back of the head thus securing the head A and dome shaped covering part C
together. The object of the dome shaped part C is to cover the end of the shank B
and form a stop for the end of the shank to bear against. The hole a¹ is so punched
as to leave an inwardly projecting boss a² which is screw threaded to receive the
end of the shank.
Instead of making the central dome shaped part C separate from the head A as
above described and represented by Figs. 1, 2, 3 and 4, the dome shaped part C
may be made in a piece with the head A as I will now describe by referring to
Figs. 5, 6, 7 and 8. In this case the ornamental sheet metal blank for forming the
head A is first raised with a central dome shaped projection C as represented in
Fig. 6. This dome shaped projection is then by spinning in a lathe or other means
necked in at 3 as represented by Fig. 7 so that this neck is somewhat smaller
in diameter than the dome shaped head C. In the next process the blank A for
forming the head is stamped in dies D¹ D2 which has the effect of raising the

page_text: blank A to its proper shape represented in Fig. 5 and somewhat reducing the
height of the head C so that the neck c³ is further contracted. The shape of the
lies will be clear by an examination of Fig. 8. It will be seen that the bottom
die is recessed at to the shape to receive the dome shaped head C and the upper
die D has a central downwardly projecting pin or peg d² of about the same size
as the hole al is required to be before it is tapped. Fig. shews the finished
head A with its dome shaped part C screwed on to the end of the picture nail
shank B.
It will be evident that, without departing from the nature of my invention, the
dome shaped part C may be formed in a piece with the head A by more or by
fewer operations than those above described.
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 :-
"
1. In a picture nail in which the head is made to screw on to the nail shank,
constructing said head of sheet metal with a central dome shaped part C fixed
to the front of the head by tongues which pass through holes in the head and are
clenched over at the back of the same, substantially as described and illustrated
by Figs. 1 to 4 of the accompanying drawings.
2. In a picture nail in which the head is made to screw on to the nail shank,
constructing said head of sheet metal with a stamped central dome shaped part C
formed in a piece therewith and having a contracted neck c³ into which the nail
shank screws substantially as described and illustrated by Figs. 5 to 8 of the
accompanying drawings.
Dated this 25th day of April 1899
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.