Improvements in Grooved Metallic Strips for Boxes for Carrying and Storing or Packing Photographic Plates and other Plates, and for other like purposes, and in the Method of and Tools for Making the said Grooved Metallic Strips.
Year: 1893

page_text: Date of Application, 19th Jan., 1893
Complete Specification Left, 30th Sept., 1893--Accepted, 18th Nov.,
1893
PROVISIONAL SPECIFICATION.
Improvements in Grooved Metallic Strips for Boxes for Carrying
and Storing or Packing Photographic Plates and other Plates,
and for other like purposes, and in the Method of and Tools for
Making the said Grooved Metallic Strips.
We, WILLIAM HENRY DUGARD and GEORGE HEATON DUGARD both of
Vulcan Mills, Bridge Street West, Birmingham in the County of Warwick
Manufacturers do hereby declare the nature of this invention to be as follows:-
11
Our invention consists, first, in shaping in the manner hereinafter described the
bottoms or closed ends of the said grooved metallic strips for the purpose of
reducing to a minimum those parts of the surfaces of the said grooved strips with
which the photographic plates carried or packed in the box can come into contact
and hence diminishing the liability to injuring the said plates.
The grooved metallic strips to which our invention applies consist of a strip of
thin sheet metal so shaped or corrugated as to form side by side a series of parallel
grooves with closed bottoms the walls of the said parallel grooves consisting of
double folds or thicknesses of metal. According to this part of our invention we
make the bottom part of cach groove of an angular figure or of a semi-circular
figure and the parallel sides of the grooves of such depth that the surface of the
grooves with which the photographic plates can come into contact, when the plates
are packed or stored in the said grooves, is reduced to a minimum. That is to say,
instead of the edges of the photographic plates bearing on the whole surface of the
sides of the grooves, as in grooved strips of the ordinary kind, the said plates when
the improved grooved strips are used bear principally against the angular or curved
bottoms of the grooves of the strips.
We prefer to form each strip with seven grooves, the outer grooves being
narrower than the five inner grooves, each of the said inner grooves being
of sufficient width to permit of the sliding in.it of two plates and the outer narrow
grooves being only of the width proper to receive a single plate.
Our invention consists secondly of the following method of and tools for making
the metallic grooved strips hereinbefore described and other grooved strips.
We make the said grooved strips in long lengths from strips of thin sheet ductile
metal or alloy, such for example as brass by drawing the said strip through one or
more pair of dies so shaped as to gradually corrugate the strip lengthwise and
afterwards shape it to the proper form.
We will describe our method of manufacturing the improved grooved strips
hereinbefore described in conjunction with the two pairs of tools which we prefer to
employ.
The first pair of tools consists of two dies having corrugations upon their opposed
faces the said dies being preferably carried in a frame the lower die being fixed on
the bed of the frame and the upper die being made capable of sliding to and from
the said lower die by means of an adjusting screw. The said corrugations in the
opposed faces of the dies taper from the entrance end to the emerging end; that is,
the corrugations are widest at the entering end and gradually taper or become
narrower as they approach the emerging end. The tapering corrugations are also
shallowest at the entrance end and gradually deepeu as they approach the emerging
end of the dies where the tapering corrugations are narrowest.
The upper die having been adjusted upon the lower die so that the space
between them at the entrance end is just sufficient to receive the long sheet metal
strip of which the grooved strip is to be made, the said strip is taken hold of by a

page_text: As
pair of tongs and drawn through the pair of dies by means of a draw bench.
the strip is drawn through the closed pair of dies it is gradually corrugated
length wise and passes from the emerging end of the dies in the form of an open
corrugated strip. This open corrugated strip is finished by subjecting it to a
drawing operation through a second pair of dies having larger parallel corrugations
so shaped as to give the required figure to the bottoms of the finished grooved strip
as well as to enlarge alternate corrugations by compressing together the sides of
intermediate corrugations and thereby forming parallel grooves the walls of which
have a double fold or thickness of metal as hereinbefore described.
Dated this 19th day of January 1893.
W. T. WHITEMAN,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Grooved Metallic Strips for Boxes for Carrying
and Storing or Packing Photographic Plates and other Plates,
and for other like purposes, and in the Method of and Tools for
Making the said Grooved Metallic Strips.
We, WILLIAM HENRY DUGARD and GEORGE HEATON DUGARD, both of
Vulcan Mills, Bridge Street West, Birmingham in the County of Warwick,
Manufacturers do hereby declare the nature of our invention and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement :-
Our invention consists, first, in shaping in the manner hereinafter described the
bottoms or closed ends of the said grooved metallic strips for the purpose of
reducing to a minimum those parts of the surfaces of the said grooved strips with
which the photographic plates carried or packed in the box can come into contact
and hence diminishing the liability to injuring the said plates.
The grooved metallic strips to which our invention applies consist of a strip of
thin sheet metal so shaped or corrugated as to form side by side a series of parallel
grooves with closed bottoms, the walls of the said parallel grooves consisting of
double folds or thicknesses of metal. According to this part of our invention we make
the bottom part of each groove of an angular figure or of a semi-circular figure, and
the parallel sides of the grooves of such a depth that the surface of the grooves with
which the photographic plates can come into contact when the plates are packed
or stored in the said grooves is reduced to a minimum. That is to say, instead of
the edges of the photographic plates bearing on the whole surface of the sides of
the grooves as in grooved strips of the ordinary kind, the said plates when the
improved grooved strips are used bear principally against the angular or curved
bottoms of the grooves of the strips.
We prefer to form each strip with seven grooves the outer grooves being narrower
than the five inuer grooves, each of the said inner grooves being of sufficient width
to permit of the sliding in it of two plates and the outer narrow grooves being only
of the width proper to receive a single plate.
Our invention consists secondly of the following method of and tools for
making the metallic grooved strips herein before described and other grooved
strips.
We make the said grooved strips in long lengths from strips of thin sheet ductile
metal or alloy, such for example as brass, by drawing the said strip through one or
more pairs of dies so shaped as to gradually corrugate the strip lengthwise and
afterwards shape it to the proper form.
We will describe our method of manufacturing the improved grooved strips
hereinbefore described in conjunction with the two pairs of tools which we prefer to.
employ.

page_text: The first pair of tools consists of two dies having corrugations upon their
opposed faces, the said dies being preferably carried in a frame, the lower die being
fixed on the bed of the frame and the upper die being made capable of sliding to
and from the said lower die by means of an adjusting screw.
The said corruga-
tions in the opposed faces of the dies taper from the entrance end to the emerging
end; that is, the corrugations are widest at the entering end and gradually taper
or become narrower as they approach the emerging end. The tapering corruga-
tions are also shallowest at the entrance end and gradually deepen as they approach
the emerging end of the dies where the tapering corrugations are narrowest.
As the
The upper die having been adjusted upon the lower die so that the space between
them at the entrance end is just sufficient to receive the long sheet metal strip of
which the grooved strip is to be made, the said strip is taken hold of by a pair of
tongs and drawn through the pair of dies by means of a draw bench.
strip is drawn through the closed pair of dies it is gradually corrugated lengthwise
and passes from the emerging end of the dies in the form of an open corrugated
strip. This open corrugated strip is finished by subjecting it to a drawing
operation through a second pair of dies having larger parallel corrugations so
shaped as to give the required figure to the bottoms of the finished grooved strip
as well as to enlarge alternate corrugations by compressing together the sides of
intermediate corrugations and thereby forming parallel grooves the walls of which
have a double fold or thickness of metal as hereinbefore described.
Figures 1 and 2 of the accompanying drawings represent in cross section (in
conjunction with portions of photographic or other plates) and plan respectively,
drawn to a large scale, a portion of a grooved metallic strip constituting part of our
invention.
The said metallic strip has a series of grooves a (preferably seven) the outer
groove on each side of the strip being of a less width than the inner grooves.
The bottoms of the said grooves are angular and the middle part a³ of each
angular bottom is flat, the inner side of the flat part of the bottom of each of the
inner grooves being of a width equal to or but slightly greater than the thickness
of two ordinary photographic plates and the inner side of the middle flat part a²
of the bottom of each of the two outer grooves being one half the width of the
middle flat part of the bottom of the other grooves. The parts of the angular
bottoms on either side the middle flat parts a a may be straight or slightly
curved. The photographic plates held in the said grooves are marked b in the said
Figure 1.
The parallel sides a³ of the grooves a having bottoms of the kind described are
of such a width or distance apart that when two plates are introduced into each of
the wider grooves and one plate into each of the narrow grooves the parallel
sides a do not come into contact with the sides of the photographic plates 6 held
in the grooves a and the injury which is done to the films on the surface of the said
plates by grooved strips of the ordinary construction is avoided, the edges only of
the photographic plates coming into contact with the flat portions of the angular
bottoms of the grooves in the strip as represented in Figure 1.
Instead of the bottoms of the grooves a being angular as described and represented
they may be curved with the same or nearly the same effect, the parallel sides of
each groove in this case being connected by a semi-circular bottom to the said
grooves as represented in Figure 2ª. Or the grooves a may have the ✓ shaped or
angular bottoms represented in Figure 2B. We prefer however to give the bottoms
of the grooves this angular shape represented in Figures 1 and 2.
By the use of metallic strips of the kinds described and represented in boxes for
carrying and storing or packing photographic plates and other plates and for other
like purposes the surfaces of the said plates are protected against injury in packing
or transport.
In making a grooved strip of the kind described and represented in Figures 1
and 2 we take a flat strip of thin sheet metal and by drawing the said strip

page_text: through a pair of dies give to it a corrugated figure as represented in cross section
and plan respectively in Figures 3 and 4.
Figure 5 represents the pair of dies, employed to produce the corrugated or
partially formed grooved metallic strip represented in Figures 3 and 4, in the press
frame or machine in which they are used;
Figures 6 and 7 represent in front and back elevation respectively the two dies
separated and
Figure 8 represents plans of the acting faces of the same;
Figure 9 represents the said dies in section when operating on a metallic strip;
Figure 10 represents the said dies in side elevation.
It will be seen by reference to Figure 8 that the corrugations in the opposed
faces of the dies taper from the entrance end to the emerging end; that is, the
corrugations are widest at the entering end and gradually taper or become narrower
as they approach the emerging end. It will also be seen by reference to Figures 6,
7 and 9 that the corrugations are shallowest at the entrance end and gradually
deepen as they approach the emerging end of the dies, where the tapering
corrugations are narrowest.
In drawing the corrugated strip Figures 3 and 4 the end of the flat metallic strip
is placed upon the die d resting on the bed of the frame or press and the upper
die c is placed in proper position with its acting face on the upper surface of the
metallic strip. The screw of the press is now rotated in the direction proper to
force the two dies together. The metallic strip is taken hold of by a pair of tongs
and is drawn in the direction of the arrow in Figure 9 through the pair of dies by
means of a draw bench. As the metallic strip passes through the dies it receives
and emerges from the back of the dies in the corrugated form represented.
The corrugated or partially formed strip Figures 3 and 4 is finished or has its
shape perfected by a similar drawing operation through a second pair of dies.
The second pair of dies is represented mounted in the frame or press in Figure 11
and in back elevation separated in Figure 12;
Figure 13 represents a plan of the acting faces of the said dies.
It will be seen by reference to Figures 11, 12 and 13 that the corrugations in the
secoud or finishing pair of dies are larger than those in the first pair of dies and
are parallel and are so shaped as to give the required figure to the bottoms of
the grooves in the finished strip as well as to enlarge alternate corrugations by
compressing together the sides of intermediate corrugations and thereby forming
parallel grooves the walls of which have a double fold or thickness of metal as
hereinbefore described.
When the modified strips Figures 2A and 2B are to be made the acting faces of
the finishing dies Figures 11, 12 and 13 have a corresponding figure given to them.
Instead of producing the grooved strip Figures 1 and 2 by two drawing operations
by means of two pairs of dies it may be produced by one drawing operation by the
use of only one pair of dies. In this case the pair of dies has the form which
would be produced by joining the front end of the pair of dies Figures 11, 12 and 13
to the rear end of the pair of dies Figures 5, 6, 7, 8, 9 and 10.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed we declare that we claim
as our invention of "Improvements in grooved metallic strips for boxes for
carrying and storing or packing photographic plates and other plates, and for
other like purposes; and in the method of and tools for making the said grooved
metallic strips" ;-
First. Forming the bottoms of the grooves of grooved metallic strips for the
purposes described and for other like purposes, angular or semi-circular so as to
keep the surfaces of the plates out of contact with the parallel sides of the grooves
of the said strips substantially as hereinbefore described and illustrated in
Figures 1, 2, 2, and 2 of the accompanying drawings.

page_text: Secondly. Making the grooved metallic strips referred to in the prior claim by
a drawing process or drawing processes conducted in the manner and by the use
of the tools herein before described and illustrated in the accompanying drawings.
Dated the Twenty-ninth day of September 1893.
WILLIAM HENRY DUGARD.
GEORGE HEATON DUGARD.