Improvements in Photographio Printing Frames.
Year: 1891

page_text: Date of Application, 4th Dec., 1891-Accepted, 16th Jan., 1892
COMPLETE SPECIFICATION.
Improvements in Photographio Printing Frames.
I, Fox SHEW, of 88 Newman Street, Oxford Street, in the County of Middlesex,
Manufacturer, do hereby declare the nature of this invention, (partly my own and
partly the result of a communication to me from M. Lehmann, of 54 Rue de Bondy,
Paris, in the Republic of France, Manufacturer,) and in what manner the same is
to be performed, to be particularly described and ascertained in and by the following
statement, reference being had to the accompanying drawings, and to the figures
and letters marked thereon:-
The invention has for its object improvements in the construction of photographic
printing frames whereby lightness, strength, and freedom from warping, are obtained,
in addition to which the pressure springs are so shaped as to present a smoothed
curved surface to the backboard.
In the accompanying drawings,
Figure 1 represents a plan of one of the improved photographic printing frames
with parts of the backboard and negative broken away.
Figure 2 is an end view, partly in section, Figure 3 is a side view partly in section,
and Figure 4 is a cross section through the centre of one of the pressure springs.
Figures 5 and 6 are sectional views of parts showing slight modifications, and
Figure 7 is a plan, Figure 8 is an end view, and Figure is a side view, of a
modified form of large sized frame.
In all the figures like parts are indicated by similar letters of reference.
I will first describe the frame represented at Figures 1 to 4. The frame is
formed of two side bars a, b, and end cross bars c, c, rivetted at their ends to the
side bars a, b.
The side bars a, b, are bent or formed to the sections represented at Figure 2,
and the bar b is shaped as shown in Figure 3, that is to say, bar a is formed with a
vertical web having an inwardly projecting flange a¹ at its bottom edge to support
the negative f, and an inclined outwardly projecting flange a² at its upper edge, to
enable the pressure springs d, d, to be rivet jointed thereto. The side bar 6 is
formed with a vertical web having an inwardly projecting flange 61 at its lower
edge to support the negative f, and having the central part 6 of the web deeper
than the ends thereof, and open ended slots 63 extending a short distance between
the deeper and shallower parts of the web to receive the free ends of the pressure
springs d, d.
The side bar a is also formed with a hole a', and the side bar b with a hole 6', by
which the frame can be hung or suspended.
The side bars a, b, are preferably made of metal, but, if desired, other suitable
materials may be employed.
The pressure springs d, d, are formed generally of the section shown at Figure 4,
so as to present a rounded or convex surface to the back-board 9, and thereby enable
them to pass smoothly over the back-board.
The backboard g is formed of two unequal parts hinged together, the joint g₁ of
which is made at some distance from the centre of the backboard to facilitate
examination of the print.
The photographic printing frame as above described is suitable for small sizes,
but for larger sizes it is advisable to give support to the negative on all four sides.
For this purpose, when retaining the form of frame above described, I adopt either
of the modifications shown at Figures 5 and 6. In that represented at Figure 5 I

page_text: form the cross bars c, c, of the section shown, so as to form a ledge c¹ to support the
end of the negative. In the modification represented at Figure 61 form the cross
bars c, c, flattened on one or both sides, and I rivet or otherwise fix thereto bars
formed with a vertical web c² and an inwardly projecting flange or ledge c¹ to
support the end of the negative.
The modification represented at Figures 7, 8 and 9 is constructed as follows:-
Instead of employing a side bar a and a side bar 6 held together by cross bars c, c,
as shown and described with respect to Figures 1 to 4, the two side bars a, a, of the
frame are of similar sectional form to that of the side bar a in Figures 1, 2 and 3,
and two pressure springs d, d, are rivet jointed to each of such side bars a.
side bars a, a are connected together by cross bars c, c, to which are rivetted
bars c', cs, as shown at Figure 6, or such cross bars may be formed of the section
shown at Figure 5.
The
Also, instead of employing a side bar 6 of the form shown at Figures 1, 2, 3, I
employ two bars 6 of similar form, which I mount at the ends of the frame on the
cross bars c, c, by forming the said bars b with knuckles 6 fitting around cylindrical
parts of the cross bars c to permit of the same being turned down when required,
and, in the case of employing L shaped end supporting bars c', c³, the vertical
webs c² are cut away at places to accommodate the knuckles 65.
In this construction of photographic printing frame, the pressure springs d, d, are
caused to press upon the backboard g in angular directions across the same, that is
to say, each pressure spring d is rivet jointed to one of the side bars a and is locked
within a slot 63 in one of the end bars b.
The pressure springs d are also formed of the section shown at Figure 4, and
they are curved as shown at Figure 7, in order that they may press on the back-
board g at suitable parts to ensure an even distribution of pressure thereon.
The backboard g is shown formed of four parts hinged together along the longi-
tudinal and transverse centre lines of the same, so that either side or end of the
backboard may be raised for the inspection of the print. This construction of
backboard however forms no part of the present invention. For the purpose of
facilitating the raising of the sides of the backboard, the bars a are each formed
with an aperture a, through which the fore finger can act to raise the side of the
backboard, and to facilitate the raising of the ends of the backboard, the bars bare
turned down on their joints on the cross bars c, as shown at one end of Figures 7
and 9, to enable access to be had to the ends of the backboard g.
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 I
claim is:
:―
1. A photographic printing frame formed of side bars of the section shown and
connected together by cross bars, metal pressure springs being rivetted to one side
and slots or recesses being formed in the other to receive the free ends of the
springs, all substantially as herein shown and described with respect to Figures 1
to 4.
2. In photographic printing frames, the employment of pressure springs of a
curved section, substantially as herein shown and described with respect to Figure 4,
and for the purpose stated.
3. In a photographic printing frame formed of sheet metal sides connected
together by cross bars, forming the cross bars of section to afford end support to
the negative, or fixing to the cross bars, end bars shaped to give such support to
the negative, substantially as herein shown and described.
4. A. photographic printing frame constructed with two similar side bars a, a,
connected together by cross bars c, c, two similar end bars b, b, hinged upon such
cross bars c, c, two pressure springs d, d, rivet jointed to each side bar
and passing
in angular directions to the end bars b, where their free ends are locked within the
Obg

page_text: open
ended slots b³, all substantially as herein shown and described with respect to
Figures 7, 8 and 9.
Dated this 4th day of December 1801
By Harris & Mills,
FOX SHEW.
23, Southampton Buildings, London, W.C., Agents.