Improvements in and connected with Photographic Cameras.
Year: 1898

page_text: Improvements in and connected with Photographic Cameras.
I, JOHN DUNSEITH MCKELLEN, of 4, Bull's Head Yard,, Market Place, Man-
chester, Photographic Apparatus Manufacturer, do hereby declare the nature of
this invention to be as follows;-
My invention relates primarily to photographic magazine hand cameras and is
intended to provide an improved method of storing and changing sensitive plates
or films.
An
Each plate or film is carried in a metal or other suitable sheath which may be
provided with projecting pins at two adjacent corners. The projecting ends of these
pins rest upon rails placed in a suitable position in the interior of the camera
which may be a box in the form usually adopted in the manufacture of magazine
hand cameras and the sheaths are pressed forward by suitable springs at the back
of the camera in the usual way so as to keep the front sheath with its sensitive
plate or film in correct register for exposure. When the plate is exposed and it
is desired to remove it and replace it by another unexposed plate it is laid hold of
by a pair of hooks (referred to hereafter) and drawn backwards over the top of the
other sheaths until its free end drops behind the back sheath. The hooks are then
returned to their original position ready to lay hold of the next front sheath.
arrangement which may be automatic or otherwise is provided by which after the
hooks have returned to their normal position in front of the front sheath it is
lifted in a vertical position with its upper horizontal edge above the level of the
other sheaths so that when the hooks are drawn back they will lay hold of it with-
out interfering with the other sheaths. The hooks are suitably attached to a door
at the back of the camera. This door may be connected with the camera by
bellows which will allow it to be drawn a sufficient distance from the camera to
allow the exposed plate to drop behind the magazine as previously mentioned; or
the back door may be attached to an outer body telescopically sliding over the
camera. The hooks may be made to engage either with the projecting pins at
the sides of the sheaths or with the sheath itself either in holes into which the
hooks enter or by forming a suitable projection on the sheath so arranged that the
books will take effective hold thereon or by a wire attached to and standing above
and parallel to the upper edge of the sheath. In the latter case a single broad
hook may be made to perform the work. A flap made of aluminium or other
suitable material is hinged to the bottom of the camera in such a way that it can
be removed entirely out of the way when the camera is being charged with its
sheaths and when changing a plate will assume such a slanting position that the
removed sheath after dropping behind the back sheath will fall gently upon it.
The back door being now returned the flap will rise to a vertical position carrying
the removed sheath with it and depositing it in its proper position at the back
of the magazine.
1000

page_text: Improvements in and connected with Photographic Cameras.
I, JOHN DUNSEITII MCKELLEN late of 4, Bull's Head Yard, Market Place, Man-
chester, but now of Mill Street, Long Millgate, Manchester, Photographic
Apparatus Manufacturer, 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 primarily to photographic hand cameras and is intended
to provide an improved method of storing and changing sensitive plates or films
in such cameras. Each plate or film is carried in a metal or other suitable sheath
which may be provided with projecting pins at two adjacent corners.
The pro-
jecting ends of these pins rest upon rails placed in a suitable position in the interior
of the camera which may be a box in the form usually adopted in the manufacture
of magazine hand cameras, or the sheaths may be made to rest upon the bottom of
the camera.
The sheaths are pressed forward by suitable springs at the back
of the camera in the usual way so as to keep the front sheath with its sensitive
plate or film in correct register for exposure. When the plate or film is exposed
and it is desired to remove it and replace it by another unexposed plate it is laid
hold of by a pair of hooks (referred to hereafter) and drawn backwards over the
top of the other sheaths until its free end drops behind the back sheath. The
hooks are then to be returned to their original position ready to lay hold of the
next front sheath. An arrangement (which may be automatic or otherwise) is
provided by which, after the hooks have returned to their normal position in front
of the front sheath, it (the front sheath) is lifted in a vertical position with its
upper horizontal edge above the level of the other sheaths so that when the hooks
are drawn back they will lay hold of it without interfering with the other sheaths.
The hooks are suitably attached to the back of the camera. This back may be
connected with the camera by bellows which will allow it to he drawn a sufficient
distance from the camera to allow the exposed plate to drop behind the magazine
as previously mentioned: or the back may be part of an outer body telescopically
sliding over an inner body. The hooks may be made to engage either with the
projecting pins at the sides of the sheaths, or with the sheath itself, either in holes
into which the hooks enter or by forming a suitable projection on the sheath, so
arranged that the hooks will take effective hold thereon or by a wire attached to
and standing above and parallel to the upper edge of the sheath. In the latter
case a single broad hook may be made to perform the work. A flap made of
aluminium or other suitable material is hinged to the bottom of the camera in
such a way that it can be removed entirely out of the way when the camera is
being charged with its sheaths and, when changing a plate, will assume such a
slanting position that the removed sheath after dropping behind the back sheath
will fall gently upon it. The back door being now returned the flap will rise to
a vertical position carrying the removed sheath with it and depositing it in its
proper position at the back of the magazine. This flap may be dispensed with,
in which case the removed sheath, after dropping behind the back of the other
sheaths, will hang in a vertical position from the hooks ready to be gathered in
at the back of the other sheaths when the outer and inner boxes are closed to-
gether.
The same changing movement may be effected by using only one body instead
of two and by moving the magazine which carries the sheaths forward within the
body so that the action of the hooks can take place in exactly the same way as
already described. I prefer the former method as it enables me to construct the
camera with a shorter focus lens than would be possible by the latter method.

page_text: In order that my invention may be more clearly understood I append drawings
of that form which I prefer to adopt as most convenient to me, but I do not con-
fine myself to this or any other particular method.
" is
Fig. 1 shows the arrangement of an outer body 1 sliding telescopically over an
inner one 2. In this figure the boxes are shewn drawn apart as far as necessary
to allow the changed sheath 3 to drop from the horizontal position 3* above the
other sheaths to the vertical position 3 ready to be placed behind them.
one of the hooks before named and shows the same hook in the position it
assumes when the two bodies are closed up. is a suitable lever which is made to
lift the front sheath into the position required, (as shewn at 3) for the hooks, a,
to lay hold of when drawing the bodies apart. is the same lever when it has
so lifted the front sheath. This lever is actuated by a projection on the hook,
the forward & backward movement of which projection causes it to alternate
between the positions indicated by the solid and dotted lines. By this movement
it. (the lever) is caused to lay hold of the sheath pins and raise them into the
position aforesaid.
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:-
Suitable mechanism by means of which in a magazine hand camera the exposed
sheath may be removed from the front, drawn over the other sheaths, and gathered
in at the back, as described.
Dated this 28th day of March 1899.