Improvements in Photographic Cameras.
Year: 1895

page_text: Date of Application, 17th Oct., 1895
Complete Specification Left, 16th Mar., 1896-Accepted, 16th May, 1896
Improvements in Photographic Cameras.
I, LODEWYK JAN RUTGER HOLST, of 259, Heerengracht, Amsterdam, in the
Kingdom of Holland, Engineer, do hereby declare the nature of this invention to
be as follows
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My invention relates to photographic cameras of that kind in which a supply
of sensitized plates or films is stored in a change box or magazine and the object
of the present invention is to cause the foremost plate, or plate to be changed, to
freely fall from the magazine at the required moment without the use of the lever
o levers forming the escapement heretofore employed
In carrying out my invention I employ wedges or their equivalents adapted to
be inserted between the first or front and second plates so as to separate the front
plate by pressing back the remainder of the plates, provision being made for
relieving the plates from the pressure of the spring to facilitate such rearward
movement.
The insertion of the wedges or the like can be effected by any suitable means,
for example, they can be fixed to springs fitted in the sides of the change box or
magazine and working automatically diectly pressure 18 removed from the back of
the plates.
As soon as the released plate has fallen into a flexible bag provided for its
reception, it is removed and introduced by hand behind the rearmost plate at
the back of the magazine and a fresh plate will automatically come into focus
Dated this 17th day of October 1895.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in Photographic Cameras.
I, LODEWYK JAN RUTGER HOLST, of 259, Heerengracht, Amsterdam, in the
Kingdom of Holland, Engineer, do hereby declare the uature 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: —
My invention relates to photographic camera changing boxes oi magazines
wherein a bag is employed for changing the plates or films, and the object of the
invention is to cause the foremost plate, or plate to be changed, to ficely fall from
the magazine at the tequned moment without the use of the lever or levels forming
the escapement heretofore generally employed
In carrying out my invention I employ wedges or their equivalents adapted to be
inserted between the fist or front and second plates so as to separate the front
plate by pressing back the remainder of the plates, provision being made for
relieving the plates from the pressure of the sping to facilitate such rearward
movement.
The insertion of the wedges or the like can be effected by any suitable means,

page_text: for example, they can be fixed to springs fitted in the sides of the changing box
or magazine and working automatically directly pressure is removed from the back
of the plates
As soon as the released plate has fallen into the flexible bag provided for its
reception, it is introduced by hand behind the rearmost plate at the back of the
magazine and a fresh plate automatically comes into focus.
I advantageously employ in combination with my improved changing box sheaths
adapted to hold the plates even when the camera is reversed, such sheaths consisting
of a thin plate of metal or other suitable material having thicc turned-in edges
forming grooves into which the plate can be inserted, the remaining edge of the
plate only being turned in over a small part of its length so as to form a
supporting hip.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawings, in which
Figue 11s a vertical section of a changing box or magazine of a photographic
camera constructed according to my invention
Figure 2 is a section on the line 2-2, Figure 1
Figure 3 is a horizontal section of the same.
Figure 4 is a part of the same section shewing one of the wedges in action:
Figures 5 and 6 are views of details.
Figure 7 is an elevation of my plate sheath.
Figure 8 is an underside view of the same, and,
Figure 9 is a view shewing the manver in which the plate is introduced or
removed from the sheath.
Similar letters of reference indicate similar or corresponding parts in the several
figuies.
16 the case of the changing box of magazine, and b, bare the wedges adapted
to be inserted between the fit and second plates in the magazine, each of the said
wedges being carried at the free end of a flat spring c fixed at the other end to a
frame e in the side of the case a. Although I have shewn the frames e as being
made of metal, it is obvious that they can be made of wood and that they can
completely cover the springs c, c. The action of these springs a tends to force the
said wedges b between the plates in the magazine.
d, d are flat springs which exert pressure on the last plate in the magazine so as
to keep the front plate pressed against the front of the case a, as shewn clearly in
Figure 3. The springs d, d are stronger than the springs c, carrying the wedges
so that the said wedges are forced back from between the sheaths el containing the
plates when the spings d, d are acting on the real sheath. The spings d, d are
attached at their middle points to a cross-bar e. One end of a pin fis fixed to the
centre of this cross-bar e, the other end of the said pin passing through a fixed bush
or button g in the back of the case a and through the knob or button, and being
secured in position by a nut which is screwed on its end.
ર
The faces of contact of the buttons g and are helical in form, as shown
clearly in Figures 5 and 6, so that when the knob h, which is advantageously milled,
is turned, the pin is pulled outwards as shewn in Figure 6, thereby flattening the
spings d, d as shown in Figure 4. The knob h is provided with a recess or notch j
so that when it has been turned to its outermost position the notch catches on the
outer edge of the button y as shewn in Figure 6, thereby holding the springs d in
then flattened position.
As the flexible bag arranged in the top of the magazine, as shewn in Figure 1.
The top of the case a is hinged so as to allow the said flexible bag to be pulled
out for the reception of an exposed plate. m, m are angle pieces or strips screwed
into the sides of the case between the plates and the flexible bag. Sufficient
space is left between the front ends of these strips and the front of the case and
between the rear ends of the strips and the back of the case respectively to allow a
plate to pass to and from the bag The front spaces n, n are a little wider than
a single sheath.
A spring p is provided at the back of the magazine which permits

page_text: a plate to pass from the bag into the magazine through the real spaces o, o but
prevents a plate from passing from the magazine into the bag.
Figures 7, 8 and 9 illustrate my sheath. 7 is the plate of metal, r, r, the three
inturned edges forming grooves into which the plate fits and s is the hip on the
fourth side. A plate is held in the sheath by the inturned edges and the lip, as
shewn in Figure 8 By squeezing the sides of the sheath so as to cause it to bulge
as shewn in Figure 9, a plate can be introduced into, or withdrawn from, the
sheath.
The operation of the apparatus is as follows After a plate has been exposed
the knob is turned into the position indicated in Figure 6, whereby the springs d, d
are pulled backwards thus relieving the sheaths c¹ from pressure. By thus relieving
the sheaths from pressure, the springs c, c have sufficient strength to force the
wedges b, b between the fist and second sheaths thereby separating the first sheath
from the rest. The top is now lifted up, the bag & pulled out and the magazine
tuined upside down so that the first sheath drops into the flexible bag through
the spaces n, n in front of the strips m, m The plate or sheath is then pushed by
hand through the spaces o, o at the back of the strips m, m behind the rearmost
plate in the magazine. The knob h is now tuned further so as to release the
notch and allow the springs d, d to resume the position shewn in Figures 1 and 3.
By this means the now foremost plate is pressed against the front of the case a and
the wedges b, bare forced back into the position shewn in Figure 3.
In practice I find it advantageous to form slots instead of rivet or sciew holes in
the fixed ends of the spings c, c so that the distance of the wedges on the fice ends
of the said springs from the front of the case a can be adjusted to suit films or
plates as desired by loosening the screws, sliding the springs into the desired
position and then again tightening the screws.
In some cases and particularly in small changing boxes only one spring d 18
employed and it will be obvious that the said spring or springs & can be pulled
back or flattened by other means than those described.
Although I have described the wedges as operated by springs I wish it to be
understood that I do not limit myself to this method as other suitable means for
operating the wedges can be employed if desired, such as by levels connected to
the cross-bar e.
It will be obvious that my magazine or changing box can be in one with, or
separate from, the camera
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 I
claim is
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1. In a magazine or changing box for photographic cameras, of the kind wherein.
a bag is employed for changing the plates on films, springs for pressing the plates
or films against the front of the magazine, means for relieving the plates from the
pressure of the springs and wedges adapted to be inserted between the front and
second plates, substantially as, and for the purpose, herein before described.
2. The use, in combination with a photographic changing box of the kind
described, of sheaths for the plates, such sheaths consisting each of a thin plate
having thee of its edges inturned and a lip formed on the fourth edge substantially
as, and for the purpose, herembefore described and illustrated in Figures 7, 8 and 9
of the accompanying drawings
3. The manufacture and use of the improved magazine or changing box herein.
before described and illustrated in the accompanying drawings.
G. F. REDFERN & Co,
4, South Street, Finsbury, London, Agents for the Applicant.