Year: 1886

page_text: I ARTHUR EDMUND MOORE of 53 Devonshire Road, Holloway in the County
of Middlesex, Manufacturing Jeweller, do hereby declare the nature of said inven-
tion 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 for its object the production of improved shutter apparatus for
photographic camera lenses whereby I obtain simplicity, efficiency of action and
compactness.
My invention is illustrated in the accompanying drawings in which Figure 1
represents a front view and Figure 2 a vertical section of my improved shutter
apparatus as it would appear when applied to a camera lens and in position
previous to the exposure of a plate.
Figure 3 is a front view of the same as it would appear when packed ready for
transport. Figure 4 is a sectional front view and Figure 5 is a vertical cross
section of the same drawn.to a larger scale and Figure 6 is a front view of parts.
In all the figures like parts are indicated by similar letters of reference.
In carrying any invention into effect I employ a ring or frame a which is divided
on one side where it is formed with lugs or flanges a capable of being forcibly
pressed together by means of a binding screw b whereby this ring or frame a is
capable of being firmly secured on the lens tube and of being readily removed
therefrom.
This ring or frame a has hinged thereto two shutters c, d which are respectively.
acted upon by springs c, d, the lower one c to open or uncover the lens and the
upper.oned to close or cover the lens.
They are also respectively acted upon by two springs c¹, d¹, the lower one c to
open or uncover the lens and the upper one d to close or cover the lens. They are
also respectively acted upon by two spring catches e, f, which rest in notches or
recesses c, d, formed in the axial ends of the levers c, d carrying the shutters c, d.
A spring g acts upon both of the catches e, f, to retain then in the grooves or
notches c, d, except when they are acted upon by the lever h to liberate them
from such notches or recesses.
The catch e acts to keep the shutter c in its closed position and the catch facts
to keep the shutter d in its open position. The spring catches e, f, consist of
levers which are mounted on studs or axes e¹ f¹ fixed in a bracket a³ connected to
the ring or frame a and the lever h is mounted on a stud or axis h¹ also fixed in

page_text: such bracket a³ and for facility of packing I form such lever h in two parts hinged
together at h to enable it to be folded down on to the ring or frame a as shown at
Figure 3 when the apparatus is not in use. This lever has its knuckle or axial
end formed with a cam h³ and hook h* so that by depressing such lever the cam
is caused to act upon the spring catch e to liberate the shutter c and thereby
expose the lens and then by a further depression of such lever h in the same
direction the hook h' is caused to act upon the tail end of the catch f to liberate the
shutter d and thereby enable such shutter again to close or cover the lens.
The short arm of the lever h is also acted upon by a spring h³ which has a
constant tendency to force such short arm into the position shown at Figure 3.
The shutter c is connected to the arm or lever c by a continuation of the
spring c¹ in order to render it to a certain extent independent of such arm, and
such spring c¹ is rivetted to the shutter c and to the lever c it is also carried
round the axis c' of the latter and is formed to bear against the ring or frame a so
as to enable it to open the shutter c when the catch e is liberated from the notch c³
in the lever c².
The shutter d is connected to the lever d by a rivet which is loose in the
lever and a piece of india rubber is placed between the shutter d and its
lever to give the former a certain amount of freedom of motion and thereby
enable it to adjust itself closely to the outer end of the lens tube.
The spring d¹ is connected to the stud or axis d around which it is coiled and
its outer end is caused to act upon the lever d³ to close the shutter d when the
catch fis liberated from the notch d³ in the said lever.
I would here remark that the form of the various levers, catches and springs
may be variously modified without departing from the peculiar character of my
invention.
My improved shutter apparatus is used in the following manner.
It is first secured to the lens tube, the upper shutter d is placed in its open
position and the lower one c in its closed position as shown at Figures 1. 2. 4
and 5 in which positions they are retained by the spring catches e. f. before
mentioned, then by depressing the lever h the lower shutter c is caused to expose
the lens and the latter may be left exposed any desired time after which by the
further depression of the lever h the upper shutter d is caused to cover up the lens,
or if an instantaneous exposure is desired the lever h can be fully depressed by one
continued action so as to open the shutter c and close the shutter d immediately
afterwards.
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 peculiar combination and arrangement of shutter apparatus for photo-
graphic camera lenses substantially as herein shown and described.
2. The peculiar combination and arrangement of shutters c. d. spring catches e. f.
and lever h substantially as herein shown and described.
3. The peculiar combination and arrangement of clamping ring or frame a
shutters cd spring catches e. f. and lever h substantially as herein shown and
described.