Year: 1888

page_text: I CHARLES BOUCKAERT of Brussels, Belgium do hereby declare the nature of my
said invention to be as follows
-
The apparatus known as Instantaneous shutters employed in Photography up to the
present have the serious inconvenience of being too large or not sufficiently compact
to enable it to be placed in the interior of the Camera.
The object of my invention is to remedy this fault as my apparatus may be placed
inside any Camera without interfering with the action. All the movements, either.
for setting or for relaxing the spring so as to increase or decrease the rate of motion
of the instantaneous shutter, are effected from the outside of the apparatus.
One of the advantages of my instantaneous shutter is that it can be placed either
inside or outside the Camera as desired.
Another essential advantage is that the shutter is put into action without uncovering
the object glass or lens.
The apparatus having been once fixed to the Camera does not require to be opened
unless it is necessary to change the diaphragm.
The apparatus is composed of a plate fixed to the Camera by means of holes and
on which all the mechanism is mounted. A lever working on an axis is actuated by
a spiral or other spring attached eccentrically on a movable rod by which it can be
rendered stronger or weaker by turning the rod to the right or to the left.
This lever carries at one end a blade spring terminated by a tappet which takes
under a pivot on the shutter to act upon it when moved.
Another lever has a spring and two detents for throwing the first lever into and out
of gear. A third lever is provided with a fork in which works the pivot and which

page_text: serves to move the instantaneous shutter; a small pin or tappet fixed to the first lover
strikes against the third lever to cause the return of the shutter.
The movement of the first lever may be retarded by arranging a small rack actuating
a pinion mounted on the same axis with a small flyer.
D
1000
H. GARDNER,
Per C. G.,
166, Fleet Street, London,
Agent for the said C. Bouckaert.
Instantaneous Shutter for Photographic Apparatus.
I, CHARLES BOUCKAERT, of 1 Avenue Georges-Henri, Brussels, Belgium, Gentleman
do hereby declare the nature of my said Invention and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement :-
The apparatus known as instantaneous shutters employed in Photography up to the
present have the serious inconvenience of being too large or not sufficiently compact
to enable them to be placed in the interiors of the Cameras.
The object of my Invention is to remedy this fault as my apparatus may be placed
inside any Camera without interfering with the action.
All the movements, either for setting or for relaxing the spring so as to increase
or decrease the rate of motion of the instantaneous shutter, are effected from the
outside of the apparatus.
One of the advantages of my instantaneous shutter is that it can be placed either
inside or outside the Camera as desired.
Another essential advantage is that the shutter is put into action without uncovering
the object glass or lens.
The apparatus having been once fixed to the Camera, it does not require to be
opened unless it is necessary to change the diaphragm.
The apparatus is composed of a plate A fixed to the Camera by means of screws
and holes N, and on which plate all the mechanism is mounted. A lever D working
on the axis C is actuated by a spiral or other spring B'attached eccentrically on a
movable rod by which it can be rendered stronger or weaker by turning the rod to
the right or to the left..
This lever D carries at one end a blade spring M terminated by a tappet which
takes under the pivot I to act upon it when moved.

page_text: The lever E has a spring Z and two detents J for throwing the lever D into and
out of gear.
The lever I is provided with a fork in which works the pivot I and which serves to
move the instantaneous shutter F, a small pin or tappet fixed to the lever D strikes
against the face N₁ of the lever L to cause the return of the shutter.
P, are the stop pins of the levers.
S, is the diaphragm.
T, is a button for setting the shutter ready for action.
V, is the button by means of which the levers D and E may be thrown in or out
of gear.
Figure 1 is a front elevation of the apparatus in the position the apparatus appears
when set for action which is effected by pressing the button V.
Figure 2 shows a plan of the apparatus, and Figure 3 is a side view.
Figure 4 (a front elevation) shows a modification of the apparatus above described,
the spring being in tension, or set.
.
The movement of the lever D may be retarded by arranging a small rack actuating
a pinion mounted on the same axis with a small flyer.
'
Having now particularly described and ascertained the nature of my said Inven-
tion and the manner in which the same is to be performed, I declare that what I
claim is:
=
An instantaneous shutter "action" for Photographic apparatus as above described,
and arranged as shown in the annexed drawings.
Dated this 1st day of December 1888.