IMPROVEMENTS IN FRAMES PHOTOGRAPHIC PURPOSES
Year: 1884

page_text: I, WILLIAM ROBERT LAKE, of the firm of Haseltine Lake & Co, Patent Agents,
Southampton Buildings, in the County of Middlesex do hereby declare the nature
of said invention for IMPROVEMENTS IN FRAMES
PHOTOGRAPHIC PURPOSES to be as follows:-
"
:-
FOR STRETCHING PAPER
FOR
This invention relates to extending frames permitting sheets of paper, prepared
with gelatine and bromide or otherwise in order to receive photographic negatives,
to be perfectly stretched, thereby rendering unnecessary the plates of glass which
are cumbersome and inconvenient to transport, and present great difficulties in
photography and particularly in the portable apparatus used by tourists and
others.
By means of this invention a sheet of negative paper, may be stretched without
there being the slightest unevenness left therein, and without any fear of tearing
the said sheet.
.
The improved frames can be employed, not only to support the negative sheets
during their exposure in the camera, but also to maintain the same in form during
the drying, after the development, without there being any creases or folds therein,
and to preserve the negative and render it perfectly level so that, when desired,
further proofs may be obtained therefrom after a lapse of a longer or shorter period
of time.
The pressure which causes the sides of the frame to expand is preferably obtained
by means of the sliding cover of the photographic frame, but I may stretch the
frame in any other suitable manner.
In order that the said invention may be well understood I have shown by
way of example several different arrangements thereof in the accompanying
drawing.
Figure 1 shows in rear and side elevation the extending frame, the wooden part
thereof being indicated by dotted lines.

page_text: Figure 2 shows in front and side elevation a modified form of the said frame and
illustrates the mode of joining the various parts thereof.
Figure 3 shows in similar views another modification.
Figure 4 is a vertical section of the frame shown in Figure 1 and shows the
position of the extending frame, in the ordinary wooden frame.
Figures 5, 6 and 7 are views hereinafter referred to.
Similar letters of reference indicate corresponding parts throughout the drawing.
The skeleton of the extending frame is composed of flexible metal such as cold
hammered copper or brass, the bands b b b¹ b¹ of which are joined by a convex
metal cross piece a a. The said bands bb b¹ 6' are separated froin one another in
such a manner that the branches a a of the cross piece can expand and separate the
bands b b 61 61 at c, as shown in Figure 3.
Points d, Figure 7, are formed on the bands bb bb' and serve to hold the
-negative paper. I may, however, fix the paper upon the frame by any other
suitable means.
The said bands are provided with pins e-figure 2-in order to prevent warping,
or with the bolt and recess f shown in Figures 1 and 5.
Upon the bands bbb161 may be placed pieces g g g¹ g¹ moving upon the hinges
h so as to enable the negative paper to be fastened between the said pieces and the
bands when these pieces are folded down and firmly pressed by the latches k.
The bands of the frame are provided externally with a projecting edge thinner
than the said bands, which edge assists in more firmly fastening the paper by
doubling the folds which are formed under the pressure of the hinged pieces.
In the modification shown in Figure 2 I arrange narrow and thick strips parallel
to the outside edges of the frame. Each of the said strips is fixed at one of its
.extremities to a band 6 or 61 by a hinge parallel to the joint c and at the opposite
extremity by means of a latch m.
This frame has also a small projecting edge to render more secure the paper which
is fastened by the strips l.
All the arrangements above described and shown in the drawing have convex
cross pieces the branches of which, when acted upon by the cover of the wooden
frame A, cause the bands b b¹ to separate and increase in length and width equal
to the maximum extension which it is required to give to the negative paper.
These extending frames are thin enough to be located under pressure in ordinary
wooden frames.
Dated this 90th day of March 1984
HASELTINE, LAKE & Co.,
For the Applicant.

page_text: I WILLIAM 'ROBERT LAKE, of the firm of Haseltine, Lake & Co, Patent Agents,
Southampton Buildings, in the County of Middlesex, do hereby declare the nature
of my invention for "IMPROVEMENTS IN FRAMES FOR STRETCHING PAPER FOR
PHOTOGRAPHIC PURPOSES" 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 frames for permitting sheets of paper, prepared with
gelatine and bromide or otherwise in order to receive photographic negatives, to be
perfectly stretched, thereby rendering unnecessary the use of glass plates, which,
being cumbersome- and inconvenient of transport, present great difficulties in
photography and particularly in the portable apparatus used by tourists and
others.
By means of this invention the sheet can be stretched without the slightest
unevenness, being left therein and without any fear of tearing it.
The improved extending frame can be employed not only to support the sheet
during its exposure in the camera but also to maintain the same, after the negativė
is obtained in the various operations, such as washing and drying, without any
folds being formed therein and, moreover to preserve the negative and render it
perfectly even again when it is desired to obtain further proofs therefrom after the
lapse of a longer or shorter period of time.
The pressure which causes the sides of the frame to extend is preferably obtained
by the application of the sliding cover of the photographic slide, but I may produce
such pressure, and consequently the extension of the frame, in any other suitable
manner.
In order that the mode in which I carry the said invention into practice may be
well understood, I have shewn, by way of example, several arrangements thereof in
the accompanying drawing.
D
Figure 1 shows in rear and side elevation the extending frame, the wooden
frame surrounding the same being indicated by dotted lines.
Figure 2 shows in front and side elevation a modification of the said frame, and
illustrates the mode of joining the various parts thereof.
Figure 3 shows in similar views another modification.
Figure 4 is a vertical section of the frame shown in figure 1; it also shews the
position of the extending frame in the ordinary wooden frame.
Figures 5, 6 and 7 are views hereinafter referred to.
Similar letters of reference indicate corresponding parts throughout the drawing.
The skeleton (figure 3) of the extending frame is composed of flexible metal,
such as cold hammered copper or brass, the bands b b b₁ b¹ of which are joined by a
bulged metal cross piece a a The said bands b b b' b' are separated from one
another in such a manner that the branches a a of the cross piece can expand and
separate the bands bb b¹ b¹ at c as shewn in Figure 3.
Points d, figures 3 and 7 are formed on the bands bb b¹ b' and serve to hold the
paper. I may however fix the paper upon the frame by any other suitable means.
The said bands are provided with pins e, figure 2, in order to prevent warping,
or with the bolt and recess f shewn in figures 1 and 5.
Upon the bands bb b¹ bi may be placed clamping pieces g g g¹ g¹ moving upon
the hinges so as to enable the paper to be fastened between the said clamping
pieces and the bands when these clamping pieces are folded down and firmly
pressed by the latches k.

page_text: The bands of the frame are provided externally with a projecting edge thinner
than the said bands, which edge assists in more firmly fastening the paper by
doubling the folds which are formed under the pressure of the clamping pieces.
In the modification shown in figure, 2 I arrange narrow and thick strips
parallel to the outside edges of the frame. Each of the said strips is fixed, at one
of its extremities, to a band b or b¹ by a hinge parallel to the joint c and at the
opposite extremities by means of a latch m. This frame has also a small projecting
edge to render more secure the paper which is fastened by the strips l.
All the arrangements above described and shewn in the drawing have bulged
cross pieces the branches of which, when acted upon by the cover of the wooden
frame A, cause the bands b b' to separate and cause an increase in length and width
equal to the maximum extension which it is required to give to the paper upon
which the negative is produced. These extending frames are thin enough to be
located under pressure in ordinary wooden frames.
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
1 claim is
First. The extending frame, constructed of suitable flexible metal, for stretching
sensitized papers or photographic pellicles, and comprising a cross piece with bulged
branches a and bands b b separated at c, in combination with clamping pieces g g¹
moving upon the binges h, and with latches k for firmly pressing the said clamping
pieces upon the paper, substantially as described with reference to Figure 1 of the
drawing.
Second An extending frame provided with strips having only one hinge
parallel to the joint and with latches m placed at the end opposite to that at
which the said hinge is secured, substantially as described with reference to
figure 2 of the drawing.
Third The extending frame provided with a bulged cross piece for separating
the bands bb bb¹ the latter being provided with points d for fixing the paper and
causing it to stretch by the pressure exerted upon the branches a when the
extending frame is inserted in the frame or slide substantially as described with
reference to figure 3.
Fourth The arrangement of the bolt f, or of the pins e placed upon the
bands bb, for the purpose of preventing the warping of the bands of the
extending frame under the strain of the branches a, substantially as described
and shewn.
The frame above described for stretching paper by pressure exerted in the
direction of the thickness of the said frame.
Dated this 12th day of December 1884
HASELTINE, LAKE & Co.,
For the Applicant.