SPRING SHUTTER FOR CAMERAS
Year: 1885

page_text: I WILLIAM Low SARJEANT of 19 Enmore Park, South Norwood in the County
of Surrey, Mathematical Instrument Maker do hereby declare the nature of my
Invention for SPRING SHUTTER FOR CAMERAS, to be as follows:-
In this invention the opening and closing of the lens of a Camera is effected
instantly, or in any longer period desired.
The apparatus consists of a shutter formed of a parallel piece of thin plate, which
slides easily in a boxed casing formed of other similar plates. The casing is pierced
by a circular aperture which corresponds with the opening of the lens the shutter
slides so as to open and close the aperture. The casing carries a means of fitting
the whole apparatus upon or into the lens. At the top of the shutter there is a
narrow parallel transverse slot made of nearly the width of the shutter, in this slot
a crank pin moves freely. Upon one side of the interior of the case a single arm
crank is fixed, the pin of which moves in the slot in the shutter described above in
such a manner that one revolution of the crank shall by means of the pin move the
shutter up and down so as to open and close the aperture of the lens once with one
revolution of the crank. A milled head screw is formed on the exterior end of the
axis of the crank and under this milled head and attached to the axis of the crank
is fixed a spiral spring (watch spring) arranged so that when the milled_head is
turned once, and let go, the reflex action of the spring, causing the entire revolu-
tion of the crank, and open and close, the aperture instantly. A latch is placed
upon the shutter case in such a manner that when the milled head is turned once
it holds it in this position with the spring in tension, in which position the shutter
may be said to be set.
The release of the latch causes therefore the instantaneous opening and closing of
the shutter. The latch is placed upon a lever, having at its opposite end an
adjustable detent pin, so that when the latch is released the detent pin will when
required permit only one half a revolution of the crank, and therefore hold the
aperture open so long as the latch is kept up. For instantaneous opening and
closing of the shutter the detent pin is adjusted so as not to catch on the crank.
when the latch is raised. To raise the latch a pneumatic nipple, tube, and air ball
may be used so that it is not necessary to touch any part of the shutter with the
hand. In this case pinching the ball opens and closes the shutter either instan-
taneously, or keeps the shutter open so long as the ball is pinched according to the
adjustment of the detent pin.
Parts of the details of this apparatus may be varied by mechanical equivalents.
The novelties of this invention are the crank arm arrangement and its latches and
detent.

page_text: Spring Shutter for Cameras.
I, WILLIAM LOW SARJEANT of 7 Belgrave Road, South Norwood, Surrey,
formerly of 10 Enmore Park, South Norwood, Surrey, 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:-
In this invention the opening and closing of the lens of a Camera is effected
instantly or in any longer period desired.
The apparatus consists of a shutter formed of a parallel piece of thin plate which
slides easily in a boxed casing formed of other similar plates. The casing is pierced
by a circular aperture which corresponds with the opening of the lens, the shutter
slides so as to open and close the aperture. The casing carries a means of fitting the
whole apparatus upon or into the lens. At the top of the shutter there is a narrow
parallel transverse slot made of nearly the width of the shutter, in this slot a crank
pin moves freely. Upon one side of the interior of the case a single arm crank is
fixed, the pin of which moves in the slot, in the shutter described above in such a
manner that one revolution of the crank shall by means of the pin move the
shutter up and down so as to open and close the aperture of the lens once with
one revolution of the crank, A milled head screw is formed on the exterior end of
the axis of the crank, and under this milled head, and attached to the axis of the
crank is fixed a spiral spring (watch spring) arranged so that when the milled head
is turned once and let go, the reflex action of the spring causes the entire revolu-
tion of the crank and opens and closes the aperture instantly. A latch is placed
upon the shutter case in such a manner that when the milled head is turned once
it holds it in this position with the spring in tension, in which position the spring
may be said to be set.
The release of the latch causes therefore the instantaneous opening and closing of
the shutter. The latch is placed upon a lever having at its opposite end an
adjustable detent pin so that when the latch is released the detent pin will when
required permit only one half a revolution of the crank, and therefore hold the
aperture open so long as the latch is kept up. For instantaneous opening and
closing of the shutter the detent pin is adjusted so as not to catch in the crank
when the latch is raised. To raise the latch a pneumatic nipple tube, and air ball
may be used so that it is not necessary to touch any part of the shutter with the
hand. In this case pinching the ball opens and closes the shutter either instan-
taneously or keeps the shutter open so long as the ball is pinched according to the
adjustment of the detent pin.
Parts of the details of this apparatus may be varied by mechanical equivalents.
The novelties of this invention are the crank arm arrangement and its latches and
detent.
The following drawings will particularly describe this invention.
Fig. 1. Front elevation A box containing spring to elevate the shutter. B-lever
to raise the latch by expansion of the india rubber ball, the latch is placed under B
part of the lever. C spring to keep the latch down. D adjusting detent. E shutter,
Fig. 2 shews the side elevation of the above, M. Milled head for setting the
shutter.

page_text: Fig. 3 Section X to W of Fig. 2 from the front. D adjusting detent. E shutter.
F crank arm, G slot in which the crank pin works.
Fig. 4. Section Y to Z of Fig. 2 in which raises the shutter is shewn.
Fig. 5 Section U to V of Fig. 1.
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 adjustable detent and its connection with the spring and the general
arrangement of the instrument as described above.
I do not claim the pneumatic arrangement.