Improvements in Shutters for Photographic Cameras.
Year: 1888

page_text: Date of Application, 23rd Aug.. 1888
Complete Specification Left, 23rd May, 1889-Accepted, 29th June, 1889
PROVISIONAL SPECIFICATION.
Improvements in Shutters for Photographic Cameras.
I ARTHUR RAYMENT of the firm of Perken Son & Rayment of 99 Hatton Garden
London in the County of Middlesex Wholesale Opticians do hereby declare the nature
of this invention to be as follows :-
--
This invention relates to improvements in the arrangement and construction of
shutters for photographic cameras and will be found very suitable and advantageous
for hand detective cameras as well as for all other cameras where applicable.
The arrangement and construction of my improved mechanism is as follows:-On
a framework a suitable aperture advantageously circular is formed opposite the lens
or lens aperture and across the plane of such aperture is moved a semi-circular piece
of thin sheet metal or other suitable material-having a corresponding aperture therein
and mounted upon a centre or pin just below the aperture.
*
Attached to this shutter piece is a cog or toothed wheel which gears with and is
actuated by a kind of quadrant or bell crank" having teeth on its outer curved
edge and turning upon a pin at its inner end or centre which latter is continued
through the bottom of the camera or case to serve as a lever or trigger for "loading"
or preparing the shutter ready for "letting off."
"
A suitable spring fastoned to the frame at one end is at its other secured to the
aforesaid "quadrant" in such a manner that the pull of the spring has a tendency to
keep the shutter closed normally.
A releasing catch or trigger is provided in the form of a crank arm mounted on a
pin or centre at the angle and having one arm thereof extending in a horizontal
direction with a notch or shoulder on each side of the end thereof one of which
engages a pin on the "quadrant" and so holds the shutter loaded ready for reloasing
(which is done by a push on the other end of the said crank) while the second shoulder
can be brought into use by removing a stop which thus allows it to engage a projecting
pin on the cog wheel to hold and retain the shutter "open as long as the pressure is
kept up on the releasing push.
23
A spring break is provided with an exterior crank for regulating the duration of
exposure by tightening the spring and so varying the pressure of such break upon
the travelling shutter or some part in connection therewith.
The foregoing description applies to a shutter constructed according to my improve-
ments with the actuating and regulating levers and cranks brought out below-but it
will be obvious that these can be placed at the top or either side if desired as the
shutter will work equally well in any position.
By making most of the parts of thin sheet metal the whole of the apparatus may
be made very compact in cross section and can be arranged and mounted in or on any
suitable part of a photographic camera or lens therefor.
32
1000
TONGUE & BIRKBECK,
34, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Shutters for Photographic Cameras.
I ARTHUR RAYMENT of the firm of Perken Son and Rayment of 99 Hatton Garden
in the City of London Wholesale Opticians 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 improvements in the arrangement and construction of
shutters for photographic cameras and will be found very suitable and advantageous

page_text: for hand detective cameras (for which it was more especially designed) as well as for
other cameras where applicable.
The arrangeinent and construction of my improved shutter mechanism is as
follows-reference being had to the accompanying sheet of drawings Figure 1 of
which shows a front view, in elevation of the shutter and its parts when ready to be
released to give an exposure.
Figure 2 shows the shutter held open in the middle position and Figure 3 shows the
shutter closed.
On a framework a a suitable aperture 6 (advantageously circular) is formed.
Opposite the lens or lens aperture and across the plane of such aperture is moved
a semi-circular piece c of thin sheet metal or other suitable material having a corre-
sponding aperture d therein and mounted upon a centre or pin e just below the
aperture d as shown in Figures 1 and 2.
Attached to this shutter piece is a cog or toothed wheel c¹ which gears with and is
actuated by the teeth on a kind of quadrant or "bell crank" f having teeth on its
outer curved edge as shown Figure 1 and turning upon a pin g at its inner end or
centre which latter is continued through the bottom of the camera or case to serve as
a lever or trigger 1 for "loading" or preparing the shutter ready for "letting off"
as shown in Figure 1.
A suitable spring h fastened to the frame a at one end is at its other secured to a
pin on the aforesaid "quadrant" in such a manner that the pull of the spring / has
à tendency to keep the shutter c closed normally.
The releasing catch or trigger acts as follows:-
A crank armi mounted on a pin or centre j at the angle and having one arm m
thereof extending in a horizontal direction with a notch or shoulder on each side
of the end there of as shown the lower one of which engages a pin n on the. "quadrant" f
and so holds the shutter loaded ready as in Figure 1 for releasing (which is done by a
push o'acting on the other end of the said crank from the side or body of the camera a)
while the second shoulder can be brought into use by removing a stop s by means of
the levers which thus allows the lower end of the crank arm i to be pushed further
in and consequently the other end m to be raised higher up and so engage a a projecting
pint on the cog wheel c' to hold and retain the shutter "open 'as long as the pressure
is kept up on the releasing push o.
29.
"A spring break' is provided with an exterior crank u for regulating or varying the
duration of exposure by tightening the spring onto the surface f' fixed to the
quadrant and so varying the pressure of such break upon the surface f' and con-
'sequently varying the speed of the shutter.
ic is a spring to keep the end m of the crank i pressed down by normally pressing
out the other end of the crank 'lever i as shown.
The foregoing description applies to a shutter constructed according to my present
improvements with the actuating and regulating levers and cranks ufands brought
'out below but it will be obvious that these can be placed at the top or either side'if
desired as the shutter will work equally well in any position..
H
By making most of the parts of thin sheet metal the whole of the apparatus may
be made very compact in cross section and can be arranged and mounted in or
on any suitable part of a photographic camera or lens therefor.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to 'be performed I declare that what I
claim is
1. The improved shutter for "detective" or other photographic cameras consisting
of a semi-circular or the like shaped 'plate 'c which "moves across the 'path" of the
lens aperture band has rigidly fixed thereto the toothed 'wheel both 'turning upon
the same centre pine the toothed wheel c gearing with 'and being actuated by
the teeth on the quadrant by which means the shutter istopened and closed sub-
stantially in the mariner and for the purposes herein before described and represented
in the drawings hereunto annexed.

page_text: 2. A shutter for photographic cameras having a part such as mounted on a
centre g the outer end of which projects outside the camera frame to serve as
the actuating lever and the inner end arranged in the form of an arc with teeth
thereon to gear into a toothed wheel c¹ fixed to the same centre pin e as the shutter
plate c these parts being arranged to act substantially in the manner and for the
purposes herein before set forth.
3. The improved shutter for photographic apparatus combined and arranged to
act substantially in the manner and for the purposes hereinbefore described and
illustrated in the drawings hereunto annexed.
Dated this 02-d day of.. 1000
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C., Agents for the Patentee.