Improvements in Photographic Cameras.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Photographic Cameras.
I, DR. RUDOLF KRÜGENER, of 11, Koenigstrasse, Frankfort-on-Main, Bockenheim,
in the Empire of Germany, Doctor of Philosophy and Manufacturer, do hereby
declare the nature of this invention to be as follows:-
This invention relates to plate changing apparatus for detective cameras.
The plate-carrying frames arranged in the magazine are provided underneath
with the usual pins projecting on both sides and resting upon ledges. The upper
portion of the foremost frame bears against a projection or ledge whilst the
pins upon its lower portion bear against the edges of a rotatable disc. A notch
is formed in this disc and also a slot; the disc turns upon a pin or pivot.
Upon each side of the sheet metal box is provided a pin which engages in the
slot in each of the discs respectively, but the said pins are not longer than the
thickness of the discs. The ends of the side flaps of the box engage with
the lower portion of the discs.
If the box is moved, by means of the knob fixed outside the camera upon a
rod which is in turn fixed to the box, for a short distance the discs on both sides
will be caused to turn uniformly and exactly together, the notches come against
the pins of the foremost frame whereupon the pins are forced by the action of
the spring into these notches and by the further rotation of the discs the frame
is carried under an horizontal ledge disengaging the pins which then slide down-
wards between vertical ledges which are fixed to and project from the lid or cover.
Upon sliding off the horizontal ledges the frame is no longer retained by the pro-
jecting top ledge or bead.
The spring presses the other frames or carries forward thereby imparting
an impulse to the foremost carrier which is sufficient to cause the latter to turn
down, even if the camera is held horizontally, although it is preferable to incline
it.
The carriers dropping to the bottom of the box are not able to shift as they fall
but are guided by the pins and are so prevented from falling upon the flat pro-
jections slightly protruding from the rear wall of the box, which when the box
is moved of course come with it.
If the box is now pressed back the projections go between the frames and prevent
Whilst the frames are
them from falling out when the camera is turned over.
held by the projections 2 they are also prevented from rising at their other
extremity, as in order to do this they would be forced to describe an arc which
the vertical ledges will not permit of. Upon pressing back the box the discs
are again turned back, the notch again comes into position and the pins of the
following frame bear against the edge of the discs.
The notch is designedly arranged so as to be somewhat higher than the pin
in order that a plate may not be changed should the knob be unintentionally
slightly pulled. The notch has thus some little distance to move before it reaches
the nin

page_text: Instead of using the box a U-shaped frame may be used to effect the same
result; this being practically the box without a bottom.
Dated this 17th day of June 1897.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
Improvements in Photographic Cameras.
I, DR. RUDOLF KRÜGENER, of 11, Koenigstrasse, Frankfurt-on-Main, Bockenheim,
in the Empire of Germany, Doctor of Philosophy and Manufacturer, do hereby
declare the nature of this invention 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 plate changing apparatus for detective cameras.
The invention is illustrated in the accompanying drawing the figures of which
are hereinafter referred to.
The plate-carrying frame r arranged in the magazine a are provided underneath
with the usual pins s projecting on. both sides and resting upon ledges. The upper
portion of the foremost frame bears against the projection c whilst the pins upon
its lower portion bear against the edges of a rotatable disc d turning upon a
pivot g.
A notch e is formed in this disc and also a slot f.
Upon each side of the sheet metal box is provided a pin which engages in
the slot in each of the discs d respectively, but the said pins are not longer
than the thickness of the discs. The ends of the side flaps of the box / engage
with the lower portion of the discs d.
If the box h is moved, by means of the knob k arranged on the outside of the
camera upon a rod 1, for a short distance (for example to the position indicated
by dotted lines) the discs on both sides will be caused to turn uniformly and exactly
together, the notches e come against the pins of the foremost frame whereupon
the pins are forced by the action of the spring o into these notches and by the
further rotation of the discs the frame is carried under the ledge b disengaging
the pins which then slide downwards between the vertical ledges m and the
ledges n which are fixed to and project from the lid or cover. Upon sliding off
the horizontal ledges 6 the frame is no longer retained by the projection c.
The spring o presses the other frames or carriers forward thereby imparting an
impulse to the foremost carrier which is sufficient to cause the latter to turn
down, even if the camera is held horizontally, although it is preferable to incline it.
The carriers dropping to the bottom of the box h are not able to shift as they
fall but are guided by the pins and are so prevented from falling upon the flat
projections slightly protruding from the rear wall of the box, which when
the box is moved of course come with it.
If the box is now pressed back the projections ? pass between the frames and
prevent them from falling out when the camera is turned over. Whilst the
frames are held by the projections ? they are also prevented from rising at their
other extremity, as in order to do this they would be forced to describe an arc
which the vertical ledges m will not permit of. Upon pressing back the box the
discs are again turned back, the notch e again comes into position and the pins
of the following frame bear against the edge of the discs d.
The notch e is diagonally arranged so as to be somewhat higher than the pin
in order that a plate may not be changed should the knob k be unintentionally

page_text: slightly pulled. The notch has thus some little distance to move before it reaches
the pin.
The discs & may with advantage be replaced by plates d¹ (Figures 3, 4, 5
and 6) which can be moved either, as in Figure 3 by means of an inclined slot f¹;
or, as in Figures 4 and 5 by an eccentric t and lever u; or, as in Figure 6, directly
by pulling a button. When the slide is moved by the eccentric and lever, a
flap w (Figure 5) may be placed on the shaft of the excentric t, which lifts upwards
when the excentric is turned in the one direction, to allow the falling frame to
pass, and, on the return motion closes and secures the frame.
The teeth may also be replaced by a spiral spring (Figure 7) in the
coils of which the plates may be arranged.
Instead of using the box a U-shaped frame may be used to effect the same
result, this being practically the same as the box without a bottom.
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. The combination in a plate changing device for photographic cameras, of
discs or plates d or d', a box h for the reception of the exposed plates, means such
as pins or projections on the said box for operating the said discs or plates, and
means such as the teeth p or spring for holding the plates in position in the
box h, substantially as described and shown in the drawing.
2. A plate changing device for photographic cameras constructed arranged and
combined substantially as herein before described and shown in the drawing.
Dated this 16th day of March 1898
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.