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Патент USA US2412681

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Dec. 17, l946;_
.c_ c; FUERST
' 2,412,681
CAMERA’ SHUTTER BLADE OPENER
Filed Jan. 5, 1945
2 Sheets-Sheet l
FIG.7.
FIG. 3.
CARL ‘C. FUERST
INVENTOR
W
75%
ATTORNEYS
Dec. 17, 1946.
c, c, FUERST
2,412,683
CAMERA SHUTTER BLADE OPENER
Filed Jan. 5, 1945
‘2 Sheets-Sheet 2
CARL c‘. FUERsT
INVENTOR
A TTORNEYS
Patented Dec. 17, 1946
2,412,681
UNITED STATES PATENT OFFICE
2,412,681
CAMERA SHUTTER BLADE OPENER
Carl C. Fuerst, Rochester, N. Y., assignor to East
man Kodak Company, Rochester, N. Y., a cor
poration of New Jersey
Application January 5, 1945, Serial No. 571,413
9 Claims. (Cl. 95-63)
1
This invention relates to photography and
more particularly to photographic shutters of
the between-the-lens type. One object of my in
vention is to provide a camera shutter which in
cludes a wide range of exposures and which, in
addition, includes a means for opening the shut
ter blades for focusing. Another object of my
invention is to provide a shutter operating mech
anism for producing normal exposures and to pro
vide a shutter blade opener which may be manu 10
2
also serves as a light spring tending to hold the
shutter blades closed while the shutter is in a
set position, thereby overcoming a difficulty
which may exist with some shutters-that is a
difficulty which occurs when certain types of
shutters are set which permits a sudden jar to
cause the shutter blades to oscillate a very slight
distance sometimes permitting light to enter.
Coming now to the drawings wherein like ref
erence characters denote like parts throughout:
Fig. 1 is a top plan view of a shutter including
ally operated without adjusting the regular shut
a shutter blade opener constructed in accord
ter mechanism for opening the shutter blades for
ance with and embodying a preferred form of
focusing on the ground glass. Another object of
my invention is to providevsuch aymechanism
my invention;
Fig. 2>is a fragmentary top plan view of the _
which can be operated only when the shutter is 15
set and in condition for exposure. A still further
object of my invention is to provide a shutter
blade opener in which there is a spring tending
to return the opener to a normal position, said
opener including a light spring tending to hold
the blades closed while the shutter is in a set
shutter shown in Fig. 1 on a somewhat enlarged
scale with the shutter cover operating mecha
nism and other parts removed to show the shut
ter blade structure. The parts are shown with
the shutter in a set position;
Fig. 3 is a considerably enlarged top plan view
of a shutter leaf driving mechanism to which my
shutter blade opener may be readily attached;
is to provide a device which exerts a slight clos
Fig. 4 is a fragmentary view showing the blade
ing action on the shutter blades, which closing
opener and associated parts in a set position, the
action is readily overcome by the shutter leaf
shutter blades, blade rings and opener being
moving mechanism of the shutter. Other ob
shown on an enlarged scale and certain parts be
jects will appear from the following speci?ca
tion, the novel features being particularly point
ing shown in section;
Fig. 5 is a view substantially similar to Fig. 4
ed out in the claims at the end thereof.
In shutters such as those used particularly on 30 but with the shutter parts in a position which
they assume after the shutter has been released
cameras designed to take sheet ?lm, ?lm packs
and the shutter blades are in an open position;
and plates, it is often desirable to focus on a
Fig. 6 is a view similar to the preceding views
ground glass by manually opening the shutter
but with the parts in the position they assume
leaves by a supplementary mechanism which does
not require any adjustment of the shutter timing "' after the shutter has been tripped; and
Fig. '7 is an enlarged fragmentary detailed sec
lever to accomplish the desired end. In cameras
tion on line l—'l of Fig. 4.
of the re?ex type and which employ a between
My invention comprises broadly providing a
the-lens type of shutter, sometimes known as
shutter blade opener which may be manually op
front shutter re?ex cameras, it is'also desirable
to have a shutter in which there is a means for 40 erated when the shutter is in a set position to
open and close the shutter blades independently
opening the shutter blades independently of the
of any adjustment to the shutter setting mech
shutter setting mechanism because it is desirable
anism. I prefer to provide an opener having the
to have a structure in which the lowering of a
general shape of a Geneva gear or Geneva stop
mirror can open the shutter blades. My pres
but not being exactly either one of these. The
ent invention is particularly directed to shutters Geneva movement which I prefer to use permits
for the above types of cameras, although obvi
two parts to turn together during a portion of
ously the shutter blade opener may be used for
any desired purpose.
'
the movement of one part and it permits one part
‘to slide during another part of the movement of
I am aware that shutter openers have been
one of the parts and to this extent it may be
provided by which blades may be opened with- '
called a Geneva-like movement. I prefer to util
out adjusting the shutter mechanism, a typical
ize a shutter operating mechanism of the type
example of such a shutter being shown in Patent
shown in my copending application, Serial No.
2,249,540, Riddell, granted July 15, 1941. My
position. A still further object of my invention
present invention is for an improvement over
the structure shown in this patent and over shut
ters employing different forms of openers which
are known.
I provide a shutter opener which can
be turned through a relatively few degrees to
open the shutter blades when the shutter is in a
set position and in addition this shutter opener
.51i9,529, entitled “Photographic shutter,” ?led
August 15, 1944, because this shutter mechanism
:is particularly suitable for my improved type of
shutter blade opener. However, it will be obvious
‘that such an opening device may be used with
other types of shutter mechanism if desired,
Fig. 1 shows a preferred embodiment of my in
2,412,681
4
3
vention. The shutter designated broadly as l is
provided with an aperture 2 through which light
passes to make an exposure, or for focusing, when.
the, shutter blades 3 open.
In the form shown
a cover 4 lies over the casing enclosing the mech
anism.
A lens focusing ring 5 may be used. and
there is an exposure scale '6 over which the ad
the end 56 of a lever 5'! pivoted at 58 and carry
ingrthe latch My‘. Thusthe masterv member 3|
may be.-released..
As thus far described the shutter mechanism
s: is identical to the showing in my copending appli
cation, Serial No. 549,529, and reference may be
had tothis application for a further and detailed
description of the shutter mechanism. However,
justing lever ‘I may turn and a diaphragm scale 8
this is: not necessary for a complete understand
over which the diaphragm‘ pointer 9. may turn;
In accordance with my invention a knob II] is 10 ing of: my present invention.
mounted on the shutter cover 4», this-knob hav
ing a pointer H. Pointer ll preferably includes
a “pimple” or protuberance 82 adapted. t'ov snap
Comingnow to my present invention, the shut
ter blade opener may consist of the knob H] as
above. described, this knob being carried by a
shaft 59 passing through the sleeve stud 52 sup
teuleavestdnan.openposition if desired. How 15 porting the. ratchetrlike. member 5.]... A spring
61 tends to turnthis. shaft in a. clockwise. direc
ever; the: pimple and dimple latch elements.- are
tion. The knob In is pinned. to one end of the
not necessary-and may be omitted.
While my shutter blade opener may be applied
shaft Eli and. on. the other end,. a Genevaelike
driver 62. is aii?xed. This driver. carries a single
to various types of shutters as is obvious to
one. skilled‘ in the art, I have illustrated on a 20 tooth 63-. and an abutment or formation 6.3.’
spaced therefrom asshowninFigsA to..6. Tooth
preferredv type of' shutter shown in my copending
(i3 is. adapted. to engage notch. 6.15 and‘ tooth. E5
application above‘ referred to. This shutter in
cludes; the casing i which, as best shown in Figs.
of blade ring 18. and,.when..the latter is. inthe set
position. of. Fig. 4a slight. turn. of knob is. may
2: and: 3-,. the casing may include an upstanding
?ange" hi‘- about its periphery and a mechanism 25 turn. the blade ringsfrom the. Fig. 4,.set. position,
to-the Fig.5, openposition. The spring 61 tends
plate! 5. This plate» i 5~may include annular slide
to hold: the blades 3' closedthrough- the engage
ways- Hi and H‘ for, in- thisiinstance, a pair of
blade rings I8 and 19.
ment. of. tooth. E3. and; tooth 65 and notch 6.4‘.
However, the. “pimple” and “dimple.” I2 and 1.3
Each shutter blade 3‘ is symmetrical in shape
and is operably connected to the blade rings. 30 may snap together. to. hold the. blades open.
into a “dimple” or recess l3 for holding the shut
. Each‘ blade has a‘ pivotal connection at 2%) with
blade ring [8-, and a pin 2-!’ and slot 22' connec
tion with blade ringv 1e. Since a rocker arm 23 is
pivoted at 24 between’ the blade rings and since
the rocker arm includesa pin 25 and slot 26. con
Returning knob HI toitsFig, 4;position may be
done manually or by the spring 6|. Whenso posi
tioned. the blade. rings may be moved by the
shutter mechanisminwhich case the. Genevaelike
driver 52 may turn until‘ thetoothtii and. spaced
abutment 63’ both may slide on the surface
68 so- that the knob lril- no. longer turns. This
movement occurs when. the parts move» to. and
nection with blade ring- i8’ and a similar pin 21
and slot 23 connection with blade ring 19, move
ment' of the blade ring‘ both opens and closes the
shutter blades 4». Both blade ringsmove together.
from. the position of rest, shown in Fig- 6, which
Consequently movement of the leaves-occurswhen 40 is-reached after an exposure is completed.
either ring is moved.
It should-benoticed- that the Geneva-like driver
In order to make an exposure one: blade ring,
62v and, the blade ring. It. with its; tooth. 65 and
here'shown as‘ [9; includes an arm 30 extending
notch ?ll are'quite similar. to at Geneva gear or
from the. ring in a generally radial direction.
Geneva stop; but are not identicalto- either. Part
This'arnr 3% lies in the path of- a pin 3!’ carried 45 [*8- is adapted to oscillate. During apart of this
by a master member 3|‘v pivoted at 32 to a link
movement the driver'?2'turns and during another
33.. Link?it is carried by a stud. 34 on mechanism
part of the oscillation the driver slides without
plate‘ l5 and a spring>35 tendsto move the master
turning. Thisisa useful feature of my invention
member link in a- counterclockwise position
since it permits'the- driver spring iii to exert a
against a. stop (not shown).
50 light‘ closing pressure‘ on bladev ring‘ if} when the
A single lever 31' serves both as. a trigger and
parts turn- together, and' affords a minimum of
setting. lever. When moved’ in the‘ direction of
braking action on the bladering when the blade
arrow A. (Fig. 3)‘ the shutter is released and when
ring 58‘ turns and the driver 52 slides (as in
moved in the direction of arrow B the shutter
Fig. 6)’.
is set. Fig. 3 shows parts in released position
The operation of myv invention is simple. As
and Fig. 2 in set‘ position. In setting, lever 3'!
suming an operator wantsto focus, he tries to
moves about the pins 38 and slots 39 connection
turn knob It. If it does not turn, because pre
withthe mechanism plate 15 so that the nose 49
vented by the Fig. 6 position, he cannot open the
engages arm to and moves it (and master member
3!) tea set position. During this movement a 60 shwtter'blades 3 and .this noti?es him the shut
ter is in a position of rest and is not ready for
latch ii! snaps behind a lug 52 on the master
an exposure; in- other words that the shutter is
member holding the latter in a set position.
not set. He then moves handle 3'! in B direc
Springs 375» hold leverv 37' normally in an‘ inter
rtion, Fig. 3, setting the shutter and moving the
mediate position of‘ rest
parts to the Fig. 4 position. Again trying handle
The master‘ member 3! is attached atv 43 to a
Hi he ?nds it turns opening the shutter blades
power spring 44 anchored’ at its opposite end £5
i-i'while parts move from Fig. 4 to Fig. 5v positions.
to. a stud 5%. When set as in Figs. 2 and ll, to
He may cause snap latch elements 92 and i3 to
release, lever 3‘! is moved in direction of arrow
engage while focusing. A reverse turn of the
A .(Fig. 3). Lug ii'l" through arm cl of lever 138
moves the: lever about its pivot I33. This releases 70 knob 58,, closes blades 3 and the shutter is ready
for an exposure. Since none of the adjustments
lever arm 59 from the ratchet-like member 5!
for adjusting shutter speed, focusing, or dia
carried by the sleeve-stud 52.. Tooth 53 is engaged
phragm opening have been altered in focusing
by lever arm 58' when the shutter is set. A spring
the exposure can be made immediately. The
5i! normally turns ratchet-like member 5i clock
wise when released so that tooth. 55. may Strike , shutter has to have been previously set because
5
2,412,681
otherwise the blade could not have been opened
for focusing.
Thus my invention provides a simple blade
opener for focusing. It serves to remind an op
erator the shutter is set for an exposure, and it
provides a light tension on the shutter blade 3
tending to prevent these blades from being acci
dentally opened while in a set position. At the
pendently of the mechanism for operating the
shutter.
7. In a camera shutter including a shutter
casing, a blade ring oscillatably mounted therein,
shutter blades movably attached thereto and
mechanism for operating the blades, the combi
nation with said blade ring, shutter blades and
operating mechanism, of a tooth-shaped forma
same time it offers but little resistance to the
tion on the blade ring, a blade ring opener for
shutter operating mechanism in making a nor 10 moving the blade ring including a single tooth
mal exposure, so that high speed exposures are
and an abutment spaced therefrom, positioned
not impaired.
to
both turn with and slide on said blade ring,
I claim:
said single tooth being adapted to engage the
1. In a camera shutter including a casing,
tooth-shaped formation on the blade ring when
blades movably mounted in the casing, a blade 16 the latter is in a predetermined position to turn
ring operably connected to the blades, mecha
therewith, and a, handle outside the shutter cas
nism for moving the blade ring, the combination
ing and connected to the blade opener for turn~
with said blades and blade ring, of a supplemen
ing the latter when the blade ring is in a prede
tal blade-opening device including a pivotally
termined position in which the tooth-shaped for
mounted blade opener, a tooth and an abutment '20 mation of the blade ring and the single tooth of
thereon, said blade ring including a tooth-shaped
the blade ring opener are in engagement, where
formation for engagement with the tooth on the
by the shutter blades may be opened independ~
blade opener to be moved thereby. said blade ring
ently of the mechanism for operating th shutter,
adiacent the tooth having an arcuate surface
and a light spring tending to turn the blade
with which the abutment on the blade opener' 25 opener in one direction.
may engage and slide when the tooth on the
opener disengages the tooth on the blade ring
8. In a camera shutter including a shutter
casing, a blade ring oscillatably mounted there
whereby the blade ring may slide with respect
in, shutter blades movably attached thereto and
to the blade opener.
mechanism for operating the blades, the combi
2. A shutter as de?ned in claim 1 character 30 nation with said blade ring, shutter blades and
ized by a shutter operating mechanism powered
operating mechanism, of a tooth-shaped forma
by a spring adapted to be set for tensioning the
tion on the blade ring, a blade opener for mov
spring, and in which the blade opener and blade
ing the blade ring, said opener including a sin
ring interengaging Geneva gear type of connec
gle tooth and an abutment spaced therefrom po
tion is positioned to turn together when said 35 sitioned to both turn with and slide on said blade
shutter mechanism spring is set.
ring, the single tooth being adapted to engage
3. A shutter as de?ned in claim 1 character
the tooth~shaped formation on the blade ring
ized by an operating handle outside of the shut
when the latter is in a predetermined position
ter casing operably connected to the blade opener
to turn therewith, and a handle outside the shut
for manually operating the latter.
40 ter casing and connected to the blade opener for
4. A shutter as de?ned in claim 1 character
turning the latter when the blade ring is in said
ized by an operating handle outside of the shut
predetermined position with the tooth-shaped
ter casing operably connected to the blade opener
formation of the blade ring engaged by the tooth
for manually operating the latter, the blade
on the blade ring opener, whereby the shutter
opener tooth and abutment and blade ring being 45 blades may be opened independently of the mech
adapted to prevent operation of said handle when
anism for operating the shutter, said blade open
the blade opener and blade ring are positioned
er, tooth, and spaced abutment preventing the
in sliding relationship, one with the other.
handle from turning the blade opener when said
5. A shutter as de?ned in claim 1 character
blade opener, tooth, and abutment slidably en
ized by a blade opener spring biased in a direc 50 gage the blade ring.
tion to tend to hold the blade ring in a blade
9. In a camera shutter including a shutter
closing direction when said blade opener and
casing, a blade ring oscillatably mounted there
blade ring are in a mutually turning relation
in. shutter blades operably attached to the blade
ship.
ring, the combination with said blade ring and
6. In a camera shutter including a shutter 55 shutter blades, of a power-driven shutter mecha
casing, a blade ring oscillatably mounted there
nism operating device, a manually operable blade
in, shutter blades movably attached thereto and
opener, means for setting the power-driven shut
mechanism for operating the blades, the com
ter mechanism, a tooth and a spaced abutment
bination with said blade ring, shutter blades and
carried by the blade ring opener, a tooth-like
} operating mechanism, of a tooth-shaped forma 60 formation carried by the blade ring, said blade
tion on the blade ring, a blade ring opener for
ring being movable and having a set position and
opening said blade ring through said tooth
a position of rest, said tooth-like formation on
shaped formation including a member having
the blade ring and the tooth on the blade opener
a single tooth with an abutment spaced there
causing the blade opener and blade ring to turn
from, positioned to both turn with and slide on 65 together as the blade ring moves about its set
said blade ring, a single tooth of the blade opener
position and said blade ring abutment and tooth
being adapted to engage a tooth-shaped forma
slidably engaging the blade ring when said blade
tion on the blade ring when the latter is in a
ring moves about its rest position, and a handle
predetermined position to turn therewith, a han
on the blade ring opener operable only when
dle outside the shutter casing and connected to 70 the tooth-like formation on the blade ring and
the blade opener for turning the latter when the,
the tooth on the blade opener are in an interen
blade ring is in a predetermined position in which
gaging position in which movement is transmitted
the tooth-shaped formation on the blade ring
from one to the other.
engages the single tooth of the blade ring opener,
CARL C. FUERST.
whereby the shutter blades may be opened inde 75
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