Year: 1898

page_text: Date of Application, 1st Feb., 1898
Complete Specification Left, 1st Nov., 1898-Accepted, 17th Dec., 1898
I, JOHN SINCLAIR, of 150, Buchanan Street, in the City of Glasgow, Bootmaker,
do hereby declare the nature of this invention to be as follows:--
This invention has for its object to provide a simple and efficient shutter for
photographic cameras for giving time or instantaneous exposures in taking
photographs and which is always set.
The improved shutter is adapted to be applied in front of or behind the lens
or between the lenses of a camera or to be used as a focal plane shutter, and it
is composed of the usual blind wound in part around two rollers and having an
aperture in it for the passage of light as in ordinary roller blind shutters. In-
stead of being actuated by a spring or springs which act on releasing the shutter
and necessitate the setting of the shutter before making an exposure, the blind
is wound upon either roller and unwound from the other by gearing together the
roller spindles and traversing the aperture in the blind in either direction across
the lens by turning either spindle or the spindle geared to them by hand, and
thus leaving the shutter set and ready for the next exposure.
The blind and rollers are conveniently carried in a wooden or metallic casing
in which the lens tube may also be fitted, and the spindles of the rollers are
connected together by means of a cord or wire wound partly around them and
around a drum placed centrally between them, the drum being carried in bear-
ings and provided with a milled head on the end of its spindle which is turned
by hand; or having a telescopic spindle the end of which may be drawn out for
Instead
operating the shutter or pushed back when the apparatus is not in use.
of operating the roller spindles by a cord or wire they may be obviously geared
together by intermediate toothed wheels or by other means, so that the turning
of the operating spindle by hand will traverse the aperture of the blind at the
required speed across the lens. For time exposures the aperture in the blind
is set in its mid position opposite the lens and the exposure made by a lens cap
in the usual way, a catch being provided to retain the blind in mid position.
Dated this 31st day of January 1898.
WALLACE
FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
aint Vincent Street, Glasgow, Agent for the Applicant.

page_text: I, JOHN SINCLAIR, of 150, Buchanan Street, in the City of Glasgow, Bootmaker,
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 has for its object to provide a simple and efficient shutter for
photographic cameras for giving time or instantaneous exposures in taking
photographs and which is always set.
The invention is illustrated by the accompanying drawings, Fig. 1 being an
end elevation, Fig. 2 a rear elevation, Fig. 3 a transverse vertical section, and
Fig. 4 a front elevation of the improved shutter.
The improved shutter is adapted to be applied in front of or behind the lens
or between the lenses of a camera or to be used as a focal plane shutter, and it
is composed of the usual blind A wound in part around two rollers B, B¹, and
having an aperture A¹ in it for the passage of light as in ordinary roller blind
shutters. Instead of being actuated by a spring or springs which act on releasing
the shutter and necessitate the setting of the shutter before making an exposure,
the blind A is wound upon either roller and unwound from the other by gearing
together the roller spindles and traversing the aperture A¹ in the blind A in
either direction across the lens by turning either spindle, or the spindle geared
to them, by hand, and thus leaving the shutter set and ready for the next
exposure.
The blind A and rollers B, B', are conveniently carried in a wooden or metallic
casing C provided with an aperture C¹ in which the lens tube may also be fitted,
and the spindles of the rollers B, B1, are connected together by means of a cord
or wire wound partly around them and around a drum E placed centrally
between them, the druni E being carried in bearings and provided with a milled
head on the end of its spindle, or the drum E may have a small pinion F upon
its spindle which is geared to a larger pinion G having a milled head H' in its
spindle I which is turned by hand; or having a telescopic spindle the end of
which may be drawn out for operating the shutter or pushed back when the
apparatus is not in use. Instead of operating the roller spindles by a cord or
wire they may be obviously geared together by intermediate toothed wheels or
by other means, so that the turning of the operating spindle I by hand will
traverse the aperture A¹ of the blind A at the required speed across the lens.
For time exposures the aperture in the blind is set in its mid position opposite
the lens and the exposure made by a lens cap in the usual way, a spring lever J
pivoted on the casing C in conjunction with a stop I on the spindle I limiting
the extent of movement of the spindle I and consequently of the blind A, the
position of the lever for such an exposure being that shewn at Fig. 1. This
spring lever J is capable of being turned out of the path of rotation of the stop I
to the position shewn in dotted lines at Fig. 1, in order that an instantaneous
exposure may be made by turning the spindle G constantly in one direction to
effect the uncovering and subsequent covering of the aperture C¹ in the casing C.
The spring lever J locks itself in either of the positions shewn by a pin J¹ upon
it entering a notch in the casing C.
The casing C is secured upon the lens tube by means of a band K which lies
within the orifice C2 in the casing C and has one of its ends secured to said
casing, its other end being attached to a screw threaded bolt L passing through
to one side of the casing where it is embraced by a nut M which can be turned
to tighten the band upon the lens tube.

page_text: 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 improved roller blind shutter for photographic cameras constructed and
arranged to operate substantially as described.
2. The improved roller blind shutter for photographic cameras consisting of
two rollers on each of which a blind having an aperture in it is wound in part,
these rollers being geared to an operating spindle, by toothed gearing or by
cords passing round a drum on the operating spindle or round a drum geared to
the latter, the turning movement of the drum being limited when a time
exposure is desired, by a stop on the operating spindle coming into contact with
an adjustable spring lever, substantially as described.
Dated this 31st day of October 1898.
WALLACE
FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, Saint Vincent Street, Glasgow, Agent for the Applicant.