Year: 1886

page_text: I FREDERICK WOODWARD BRANSON of Commercial Street, Leeds in the County.
of York, Pharmaceutical Chemist do hereby declare the nature of this invention
to be as follows:-
My invention has reference to improvements in photographic shutters for which
Letters Patent were granted to me, dated 5th February 1884 N° 2767.
According to my present invention, on the end of the spindle which carries the
flap, I mount a lever having thereon a suitable adjustable weight, as described in
the Specification of the above mentioned patent, which lever is fixed in such a
position on the flap spindle, that on the flap being relieved from the catch which
retains it closed, it causes such flap to open,
Now the object of my invention is to provide a means to relieve the catch which
holds down the flap so as to admit of its being opened by the weighted lever and
at the same time to arrest the fall of the drop for any required period of exposure.
For the above purpose I mount two catch levers on the framework of the
photographic shutter, one of which is employed to retain the flap closed until it is
required to be opened for the exposing operation; and the other catch lever is
employed to prevent the drop from falling until the time of exposure has been
completed.
The aforesaid catch levers are connected at their outer ends by cord, chain or
rod, so that on relieving the flap catch lever for the purpose of allowing the flap to
open, the drop lever catch passes under a projection upon the drop, and prevents
it from falling until allowed to do so by the movement of the catch.
•
The aforesaid catch levers are actuated through the medium of a pneumatic
arrangement attached to the framework of the shutter. This pneumatic arrange-
ment may be worked by means of a pressure of air from some convenient source, and
arranged that so long as the pressure of air is kept up, the drop catch lever
prevents the drop from falling, but as soon as the pressure is taken off, the catch
moves away allowing the drop to fall and cover the lense. On the pressure of air
being taken off, the flap catch lever brought into position for holding down the
flap and the drop catch moved away from the projection on the drop by means of
a spring attached to either of the catch levers and the framework.
Dated this 17th day of April 1886.

page_text: •
I, FREDERICK WOODWARD BRANSON of Commercial Street, Leeds, in the County
of York, Pharmaceutical Chemist, do hereby declare the nature of said 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 has reference to improvements in photographic shutters for which
Letters Patent were granted to me dated 5th February 1884 N° 2767.
DESCRIPTION OF DRAWINGS..
Fig. 1, is a front elevation, Fig. 2, a side elevation, Fig. 3, a back elevation, Fig. 4
is a front elevation shewing my improvements with elongated drop.
According to my present invention, on the end of the spindle a which carries
the flap b, I mount a lever c having thereon a suitable adjustable weight d, as
described in the Specification of the above mentioned patent, which lever c is fixed
in such a position on the flap spindle a that on the flap b being relieved from the
catch lever e which retains it closed, it causes such flap b to open.
Now, the object of my invention is to provide a means to relieve the catch e
which holds down the flap b so as to admit of its being opened by the weighted
lever d and at the same time to arrest the fall of the drop ƒ for any required period
of exposure.
For the above purpose I mount two catch levers e and e¹ on the framework g
of the photographic shutter, e being employed to retain the flap b closed, until it
is required to be open for the exposing operation, and the other catch lever e¹ is
employed to prevent the drop ƒ from falling until the time for exposure has been
completed.
The aforesaid catch levers e and e¹ are connected at their outer ends by cord,
chain or rod i so that on relieving the flap catch lever e for the purpose of allowing
the flap b to open the drop lever catch et passes under a projection ; and prevents
it from falling until allowed to do so by the movement away of the catch e¹.
The aforesaid catch levers e and e' as shewn in the drawings, are actuated
through the medium of a pneumatic arrangement of ordinary construction through
piston rod k being actuated by a pressure of air from any convenient source, and
so arranged as so long as the pressure of air is kept up, the drop catch e¹ prevents
the drop from falling, but as soon as the pressure of air is taken off or relieved, the
catch moves away allowing the drop f to fall and cover the lense.
On the pressure of air being taken off, the flap catch e is brought into position
shewn in drawing for holding down the flap, and the drop catch e¹ moved away
into position shewn in drawing clear of the projection j on the drop f by means of
a spring attached to either of the catch levers and the framework.
I also provide for the purpose of preventing the flap in any way interfering with
the movement of the drop. This is effected by means of a pin m attached and
projecting from the flap spindle a, being brought to bear upon a side spring n of
the framework, as the flap b rises for exposure, and prevents such flap 6 coming in
contact with the drop f.
b

page_text: I would further remark that although I have stated that I employ a pressure of
air in operating the catch levers e and e', water or other fluid may be employed.
In some cases I dispense with the flap b and extend the drop f downwards, as
shewn at Fig. 4, to take its place.
The lense is covered in this arrangement by the lower part o of the drop f.
and in connection with this I employ the herein before mentioned catch levers e
and e¹..
The lower catch e as shewn in drawing retains the drop f over the lense
until such catch lever e is removed, in the same manner as that described for the
flap b, and simultaneously with: this movement, the upper catch e¹ projects on to
the drop so as to arrest the motion thereof when the opening p is brought in front
of the lense, at which time the projecting piece or pin q rests upon the catch e¹.
On the completion of the exposure the catch e¹ is withdrawn as herein before
described allowing the upper or blank part r of the drop f to fall further and cover
the lense.
When the shutter is required for instantaneous exposure the cord or rod i is
relieved from the catch levers.
In some cases I prefer to dispense with the weighted lever d, and substitute the
pull of
rubber band on the drop f, so that on the flap 6 being removed from the
catch lever e as aforesaid, the rubber band presses the drop f upon the bevelled
top's and thus causes the flap 6 to open until brought to rest by the side spring n.
The fall of the drop fis arrested as afore described so long as the pressure on
ball is continued.
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 arrangement and application of catch levers cand e¹ operating
substantially as and for the purposes herein set forth.
2. The arrangement and application of catch levers e and e¹ operating in
conjunction with the elongated drop f substantially as herein set forth and shewn
at Fig. 4.
3. The combination of the various parts forming the photographic shutter, the
flap b and drop f operated through the medium of the lever catches e and e¹
respectively substantially as herein set forth.
Dated this th
T.1 1000
J. W. HARDING,
Agent.