Improvements in Photographic Changing Cases.
Year: 1890

page_text: Date of Application, 10th Nov., 1890
Complete Specification Left, 25th June, 1891-Accepted, 25th July, 1891
PROVISIONAL SPECIFICATION.
Improvements in Photographic Changing Cases.
I, Dr. RUDOLF KRÜGENER, of Bockenheim, near Frankfort-on-the-Main, in
the Empire of Germany, do hereby declare the nature of this invention to be as
follows:
:-
My invention relates to photographic changing-cases.
In the improved case constructed according to this invention the plates are
changed in a very simple manner by drawing from the case a small box which
contains the plates so that the front plate will remain in the case, fall upon the
bottom of the latter, and pass behind the last plate when the small box is pushed
back into the case.
This principle of changing plates is known, and is already carried into practice
in such a manner that before the small box is drawn out the front plate is separated
from the other plates by a special slide which closes the said box, whereupon the
whole box is pulled out, the separated plate falling upon the bottom and being
placed behind the other plates when the box pushed back.
In my improved changing case the slide, which never closes the box quite
hermetically is dispensed with and use is made of a kind of folding bag surrounding
the entire box. This bag excludes the light on every side and entirely obviates
leakages that are liable to occur when slides are employed. In order that, when
the box is drawn out, the front plate shall alone remain in the case, at the end of
one side of the case is arranged a metallic bar which protrudes a distance corre-
sponding exactly to the thickness of a plate beyond the bearing plate provided on
the side of the case. Against the aforesaid metallic bar always bears the lower
edge of the front plate. On pulling the box from the changing-case the front plate
is retained in the case and drops upon the bottom if the case is held so that the
plates are placed in a horizontal position.
When the box is pushed into the case again the plate which was originally in
front is caused to pass behind the last plate in the box. The box is adapted to be
drawn from the case only to such an extent that the front end of the upper plate
will not slide from the above-mentioned metallic-bar as otherwise it would be
impossible to push the small box back into the case.
The plates are held in metallic frames so that in reality these frames are changed.
Springs are provided which tend to force the frames or plates continually to the
front into the focus.
My improved arrangement is extremely simple, and it is sufficient to move the
small box into and from the case in order to change a plate, for which, in the
changing cases heretofore used, which are very liable to allow the access of light,
double the number of manipulations are needed.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Photographic Changing Cases.
I, Dr. RUDOLF KRÜGENER, of Bockenheim, near Frankfort-on-the-Main, in
the Empire of Germany do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
My invention relates to photographic changing-cases.

page_text: In the improved case constructed according to this invention the plates are
changed in a very simple manner by drawing from the case a small box which
contains the plates so that the front plate will remain in the case, fall upon the
bottom of the latter, and pass behind the last plate when the small box is pushed
back into the case.
This principle of changing plates is known, and is already carried into practice
in such a manner that before the small box is drawn out the front plate is separated
from the other plates by a special slide which closes the said box, whereupon the
whole box is pulled out, the separated plate falling upon the bottom and being
placed behind the other plates when the box is pushed back.
In the accompanying drawing I have shown how my said invention may be con-
veniently and advantageously carried into practice, the figures of the said drawing
being hereinafter referred to.
In my improved changing case the slide, which never quite shuts out the light is
dispensed with and use is made of a kind of folding bag surrounding the entire
box a.
This bag excludes the light on every side and entirely obviates leakages
that are liable to occur when slides are employed. In order that, when the box is
drawn out the front plate shall alone remain in the case e, at the end of the side
wall of the case a is arranged a metallic bar e which protrudes a distance corre-
sponding exactly to the thickness of a plate beyond the bearing plate provided on
the side of the case. Against the aforesaid metallic bar e always bears the lower
edge of the front plate (see Figures 1 and 2). On pulling the box a from the
changing-case c the front plate is retained in the case and drops upon the
bottom ༡ if the case c is held so that the plates are placed in a horizontal
position.
When the box a is pushed into the case c again the plate which was originally
in front is caused to pass behind the last plate in the box a shown in Figure 3 in
dotted lines upon the bottom of the case.
Th box a is adapted to be drawn from the case c only to such an extent that
the font end of the upper plate h¹ (see Figure 3) will not slide from the above-
ment oned metallic bar e, as otherwise it would be impossible to push the small
box a back into the case c.
The plates are held in metallic frames & so that in reality these frames are
changed.
Springs are provided which tend to force the frames or plates continually to the
front into the focus.
My improved arrangement is extremely simple, and it is sufficient to move the
small box a into and from the case in order to change a plate, for which in the
changing cases heretofore used which are very liable to allow the access of light,
double the number of manipulations are needed.
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 1
claim is :-
A plate-changing device for photographic cases having a plate-box (a) which
can be drawn out and is surrounded by bellows or a bag, consisting in the arrange-
ment of a bar (e) (pins or projections) which in drawing out the plate box (a) from
the case (c) retains the upper plate and allows it to fall upon the bottom of the case,
whereupon the plate lying at the bottom is pushed below the other plates when the
box (a) is moved into the case (c).
521
T
1001
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.