Improvements in or relating to Photographic Shutters.
Year: 1899

page_text: Date of Application, 15th Apr., 1899-Accepted, 17th June, 1899
Improvements in or relating to Photographic Shutters.
I, WILLIAM OSWALD STANLEY, of 31, Lincoln Place, Dublin, Ireland, Manu-
facturer, 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 means for actuating shutters used in photographic
apparatus.
The annexed drawing illustrates the invention as applied to a shutter of the
roller blind variety and enables such a shutter to be used without a spring and
to be at all times set and ready for use.
Fig. 1 is a front elevation of the shutter with its actuating mechanism the
cover of the case containing it being shown removed. Fig. 2 is a plan view
thereof with the top part of the case removed.
In a case A the back and front of which are intended to be perforated to suit
whatever lens may be used as shown at a and a¹ are journalled two rollers B B¹
having on them pulleys C C' respectively geared to one another by a cord D
preferably elastic. To one roller B is attached a blind E and to the other roller
a blind E; suitable strengthening strips F F are fastened along the ends of
these blinds and these two strips F F are attached to one another preferably at
their ends by cords or the like G so as to leave an interval of space H between.
them which may be more or less in width according to the amount of exposure
desired. To each of the strips F F is attached a cumulative system J of levers
of the kind known as those applied to lazy tongs, namely first two links jj pivoted
at to the strip For F, two levers pivoted together at and to the ends
of links jjat jj and further couples of levers similarly pivoted together
and to the next couples, the last couple being pivoted also to the case A at 7 and
preferably having their outwardly extending ends shaped to form finger holes 78 78.
The shutter being in the position shown in Figs. 1 and 2 by pressing together
the finger holds on the left the strip F will be carried to the right unrolling
the blind E and turning roller B. The cord D transfers the rotary movement of
roller B to roller B and also winds up the blind B', the elasticity of the cord D
allowing of difference in the rotary speeds of the two rollers. The system of
levers on the right will now be compressed as illustrated for those on the left in
the drawing, and, when next the shutter requires to be actuated for purposes of
exposure, a similar pressure on the finger holds on the right will again carry
the blinds into the position shown in Figs. 1 and 2.
It is obvious that I do not confine myself to a shutter in which blinds are
rolled on rollers but may apply my invention to any shutter in which opaque
screens or parts of a screen extend in two opposite directions from an exposure
slot or space and are movable together back and forth so as to carry the exposure
slot alternately back or forth across a stationary opening and may apply the
motive gear on one or both sides of said slot or space.

page_text: Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed I declare that what
I claim is:
1. The combination with a photographic apparatus shutter having opaque
screens extending in two opposite directions from an exposure space, of a cumu-
lative system of levers having connection with said screens, a stationary case, and
pivotal connection of the extreme lever of said system with said case substantially
as and for the purpose set forth.
2. The combination of a case, two rollers therein gear elastically connecting
said rollers for simultaneous revolution, two blinds attached to said rollers,
strengthening strips at the ends of said blinds means for connecting said strips
so as to leave an interval between them, two cumulative systems of levers having
attachment respectively to said strips and pivotal connection of their extreme
members to the case for the purpose set forth.
Dated 1 15th low of A
1900
HERBERT HADDAN & Co.,
Agents to Applicant,
18, Buckinghamı Street, Strand, London.