Improvements in Photographic Film Carriers, and the Manufacture thereof.
Year: 1897

page_text: Date of Application, 26th June, 1897
Complete Cannifine
OCL
2000
Date of Application, 26th June, 1897
Complete Specification Left, 25th Mar., 1898-Accepted, 14th May, 1898
PROVISIONAL SPECIFICATION.
Improvements in Photographic Film Carriers, and the Manufacture
thereof.
I, JOHN EDWARD THORNTON, of Rokeby, Oldfield Road, Altrincham, in the
County of Chester, Manufacturer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to carriers for holding photographic films in dark slides,
plate-holders, magazines, and the like. Carriers have usually been made of sheet
metal which was turned over at two or more sides so as to form grooves for holding
the film. These carriers have not been stiff enough unless made of stout metal
(which was too heavy) or otherwise stiffened by the insertion of a piece of
cardboard.
The object of this invention is to stiffen the carriers in such a manner that they
can be cheaply manufactured, of very thin sheet metal. The cardboard backing
is dispensed with, and the finished carrier is very light and rigid, and capable of
fitting any slide or other holder that glass plates will fit.
In constructing a film carrier according to my invention, I take a sheet of
extremely thin iron or other sheet metal a little larger than the size of the film;
this is turned over on three sides to form a groove for the film, and a thumb
piece or notch is cut out of the fourth side to facilitate removal of the film.
The stiffening is effected by forming an indented line or rib projecting from
the surface (preferably the underside) of the carrier. As many ribs as desired
may be used. In order to prevent buckling of the metal in manufacture I make
the ribs to run off at the edges of the carrier, to do which they turn off at an angle
from the main line and run off at the corners of the carrier. In this way the
line of rib runs from edge to edge of the carrier, notwithstanding the turned over
edges which would prevent the rib running from side to side if it were not for
the angle at which they run off. If preferred the ribs may be of curved or any
other suitable form.
The extreme ends of the overlapping sides are cut off diagonally, so that they
do not meet at the corners of the carrier, but instead have a clear space for the rib
to run off.
The stiffening ribs are formed in a press by suitable tools or other means.
. ...
000
COMPLETE SPECIFICATION.
Improvements in Photographic Film Carriers, and the Manufacture
thereof.
I, JOHN EDWARD THORNTON, of Rokeby, Oldfield Road, Altrincham, in the
County of Chester, Manufacturer, do hereby declare the nature of this invention
Price Sd.1
Improvements in Photographic Film Carriers, and the Manufacture
thereof.
I, JOHN EDWARD THORNTON, of Rokeby, Oldfield Road, Altrincham, in the
County of Chester, Manufacturer, do hereby declare the nature of this invention
[Price 8d.1

page_text: 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 carriers for holding photographic films in dark slides,
plate-holders, magazines and the like. These carriers have usually been made of
sheet metal which was turned over at two or more edges so as to form grooves
for holding the film. They have not been stiff enough unless made of stout metal
(which was too heavy) or otherwise stiffened by the insertion of a piece of
cardboard.
The object of this invention is to stiffen the carriers-in, such a manner that they
can be cheaply manufactured of very thin sheet metal. The cardboard backing
is dispensed with and the finished carrier is very light and rigid and capable of
fitting any slide or other holder that glass plates will fit
It consists essentially in forming or stamping the carriers from thin sheet
metal with an indented line or rib or indented lines or ribs projecting from one
surface (preferably the underside) whereby they are stiffened and buckling is,
prevented.
It will be fully described with reference to the accompanying drawings:
Fig. 1. Front elevation showing one arrangement of the ribs.
Fig. 2. Tranverse section of same.
Fig. 3. Front elevation showing another arrangement of the ribs.
Fig. 4. Transverse section of same on line r—r.
i 76
it
In carrying out the invention I take an extremely thin sheet A of iron or
other metal of rectangular shape cut to the size required being a little larger than
the area of the film. Three of the edges are turned over to form the grooves a a¹ a²
to receive the edges of the film and the fourth edge is cut with a thumb hole or
notch to facilitate the insertion and removal of the film.
"
An indented rib groove or line B is stamped into the plate so; as to leave a
groove on one surface and raise a rib or projection on the other surface, the
groove being preferably on the front and the rib on the back.
"
For small plates the rib B preferably extends round the carrier a short distance
from the edge as in Figs. 1 and 2 and for larger plates in addition two diagonal
lines or ribs are formed. The rib may also be carried round the fourth side of the
rectangle if desired. though in practice the fourth side is strong enough because
the metal is turned over on that side to form the groove.
1
In either case it is preferable to make the ribs run off at the corners to do which
they turn off at an angle from the line or rib parallel to the edge. This prevents
the buckling of the carrier during the process of stamping and renders it stiffer
or more rigid. In this way the line or rib runs from edge to edge of the carrier
notwithstanding the turned over edges which would prevent the rib running from
side to side if it were not for the angle at which they run off. If preferred the
rubs may be of curved or any other suitable form.
.~
The extreme ends of the overturned edges are cut off diagonally so that they do
not meet at the corners of the carrier but instead have a clear space for the rib
to run off.
"
• F
The stiffening ribs are formed in a press by suitable tools or other means.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is
1. A carrier for photographic films constructed of thin sheet metal with indented
lines, grooves or ribs stamped on to the surface running in any direction or placed
in any position for the purpose of stiffening the carrier substantially as described.
2. In the manufacture of carriers of photographic films from sheet metal the
method of preventing buckling of the sheet during the process of stamping by
forming the ribs to extend to the extreme edges at the corners substantially as
described and shown.

page_text: 3. A carrier for photographic films constructed substantially as described
and shown.
T Ihof k 1908
WM. P. THOMPSON & Co.,
. 6, Bank Street, Manchester, Patent Agents.