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Патент USA US2406691

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Aug» 27» 1946-
a. JAcoBso'NET AL
2,4965%!
CAMERA. AND LIGHT SYNCHRONIZER
‘ Filed May 6' 1944
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IN VEN TORS
BY IY'ZJZJhgJdaaEson
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Aug- 27, 1946-
I. JAc'oBsQN ET AL,
2,405,691
CAMERA AND LIGHT SYNCHRONIZER
Filed May 6, 1944
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4 Sheets-Sheet 2
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IN VEN TORS
BY Ikijé?ge?uo Eson'
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HaroZdESmz'iFv
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Aug- 27, 1946-
2,406,691
LJACOBSON ET AL‘
CAMERA AND LIGHT SYNCHRONIZER
Filed May 6, 1944
4 Sheets-Sheet 3
R.
INVENTORS.
"BY I?lling JacoZson
HaY'OZdESmZJi-ZI/
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Aug- 27, 1945-
a. JACOBSON ET AL,
2,406,591
CAMERA AND LIGHT SYNCHRQNIZER
Filed May 6, 1944
4 Sheets-Sheet 4
2,11%,691
Patented Aug. 27, 1946
I UNITED
STATES
PATENT
OFFICE
2,406,691
CAMERA AND LIGHT SYNCHRONIZER
Irving Jacobson, Hollywood, Calif., and Harold E.
Smith, Rochester, N. Y., assignors to Gra?ex,
Inc., Rochester, N. Y., a corporation of Dela
ware
Application May 6, 1944, Serial No. 534,396
16 Claims. ((31. 67--29)
1
This invention relates to a new and improved
synchronizer for synchronizing a photo?ash lamp
2
the shutter when the shutter is set for a so
called one-fifth of a second exposure; while still
other and important objects will be apparent from
the ensuing description of the disclosed embodi
In order that the principle of the invention may Gr ment of the invention.
Referring to Figs. 1 and 2, the camera body is
be readily understood, we have disclosed a single
designated generally at 20 and is provided with a
embodiment thereof in the accompanying draw~
hinge cover 2 l, a handle 22, a focusing hood 23, a
ings, wherein
bellows 213, a lens shade 25, a sensitized material
Fig. 1 is a left-hand side elevation of the cam
era, viewing Fig. 2,, showing the mounting of the 10 holder 26, a focusing knob 21, a lens board 28, a
lens 29 and a cover catch 30, a shutter plate 3| and
shutter plate containing the synchronizer contacts
a tension plate 32 provided with a tension knob 33,
and the mounting of a battery case and re?ector
with a focal-plane shutter when used in a reflex
camera.
a tension release button 34 and a tension indi
upon the camera;
cator 35. IAN. these parts may be of usual or any
Fig. 2 is a front elevation of Fig. l ;
Fig. 3 is a view similar to Fig. l, but upon a 15 other suitable construction.
The tension plate 32 is attached to the camera
larger scale and having certain parts shown in
body 20 by means of screws 38, 3E, and the plate
dotted or broken lines to indicate their position
3i is attached to the camera body by means of
in the camera, a circuit diagram from the shutter
plate to the ?ashlamp being also shown;
screws til, 31. The shutter plate 3i is provided
with a shutter rewind knob 38 having a hub 38a
and release lever 39 having a horizontal arm 3%.
and attached to the said shutter plate 3| by means
side, the shutter being in condition ready for
of a screw lit. Passing through the shutter plate
making an exposure;
3| is a shaft III to which is attached a mirror re
Fig. 5 is a view similar to Fig. 4 but with the
mirror frame released, thus releasing the shutter 25 set lever 42. To the camera body 20 a battery
case lid is attached by means of a clamp 44 fas
mechanism for making an exposure, the contacts
tened to a bracket ‘i5 that is itself attached to said
of the synchronizer mechanism being shown in
camera body 28 by means of screws 46, 46. Also
closed condition;
attached to the battery case 43 or made a part
Fig. 6 is an enlarged fragmentary detail, partly
30 thereof is a reflector lil having a socket 48 which
in section, of the contact members;
receives the flashlamp 49. The said battery case
Fig. 7 is a detail of the interlock member for
is preferably of a structure substantially the
controlling the operation of the synchronizer con
same as the battery case disclosed in the United
tacts;
States patent to Oscar Steiner, No. 2,293,477,
Fig. 8 is a view similar to Fig. 5, but showing the
dated August 18, 1942, but any similar battery
shutter mechanism at the completion of an ex
case having an outlet known as a series outlet can
posure, the mirror frame not yet having been re
Fig. 4 is a view of the shutter plate removed
from the camera and viewed from the camera
set;
Fig. 9 is a vertical section through Fig. 8 on the
line 9-9 thereof, showing the position of the vari
ous parts of the shutter mechanism; and
Fig. 10 is a transverse section through Fig. 8
on the line Ill-l El thereof, showing the construc
tion of the synchronizer contacts and the syn
be used instead.
Now referring to Fig. 3, which is a view similar
to Fig. 1, but on a larger scale and wherein the
mirror frame lid is shown in dotted lines, such
mirror frame 53 is pivoted on said shaft M which
passes through the shutter plate 3! and through
the mirror frame at and terminates in a suitable
bearing on the opposite side of the camera. The
One of the objects of this invention is to pro 455 said mirror frame 50 is caused to be moved in a
contraclockwise direction by means of a spring
vide a synchronizer that will synchronize lamps
(not shown). On the right-hand side of the
of the short ignition period, namely, in the neigh
camera, viewing Fig. 2 and as clearly shown in
borhood of five milliseconds. Other objects of the
dotted lines, Fig. 3, is a mirror release lever sup
invention are to control such synchronization by
chronizer receptacle.
the shutter mechanism, to interlock the synchro
nizer circuit through the operation of the mirror
frame, to prevent the inadvertent ?ashing of a
lamp when rewinding the shutter or changing
the shutter aperture, and to provide a synchro
nizer for synchronizing a photo?ash lamp with
port plate 51 securely held to the camera body
2b by screws 52, 52 and pivoted to said plate 51
is a mirror release lever 53 by means of a shoulder
rivet 54. The said mirror release lever 53 is caused
to be moved in a contraclockwise direction by a
spring 55 so that a projection 56 of the said
2,406,691
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A
mirror release lever 53 will engage the lower edge
of the mirror frame 58 when it is in the position
shown in Fig. 3. When the handle portion 5'] of
clockwise direction, the mirror frame 58 will be
Fig. 9, passing through a slot in said disk 82 is a
longitudinally slidable shutter release bar 85 hav
ing an inwardly-turned member or projection 86,
shown best in Fig. 10 and in dotted lines in Figs.
4 and 5, which member or projection is for the
released and will be caused to be moved in an
purpose of engaging the shutter release lever 39.
upward direction by reason of the mirror frame
The said shutter release bar 85 is also provided,
as shown in Fig. 10, with an outwardly extending
formation 81 to permit the operator to manipu
late the shutter release bar 85 by sliding it length
said release lever 53 is moved in a downward or
spring, previously referred to.
The tension plate 32 is provided with a bearing
58 into which a shaft (not shown) is ?tted. The
said shaft passes through the curtain shutter ten
wise, so as to allow the mirror frame 50 to move
sion roller 59, shown in dotted lines in Fig. 3.
Desirably the said tension roller is of well-known
upward to horizontal position without operating
the shutter curtain, because the inwardly turned
construction and needs no further description.
Carried upon the said curtain shutter tension
roller 59 is a shutter curtain 60 that passes over
member or projection 86 of the said shutter re
,\ lease bar 85 will, when the said bar is slid, be
an idler 6|, shown in dotted lines in Fig. 3, and
so that the shutter release lever 39 will not be
engaged. The said shutter release bar 85 is pro
vided with an elongated opening 85a to clear the
shaft 41 and to limit the movement of such bar
across the back of the camera body onto the
shutter take-up roller 62, shown in dotted lines
in Fig. 3, such take-up roller being provided with
a shaft 63, shown in Fig. 3 and in section in Figs.
4, 5 and 8. One end of the said shaft 83 is carried
displaced in a left-hand direction viewing Fig. 10,
85, as clearly indicated in dotted lines in Figs.
4, 5 and 8.
by a bearing 64 attached to the shutter plate 3i
The shutter release lever 39 is carried on a
and the opposite end of said shaft 68 is carried
bushing 88, shown in Figs. 9 and 10, which is
by a suitable bearing (not shown) attached to,
the right-hand side of the camera body.
Referring now to Figs. 4 to 10, there is attached
to the said shaft 83 in any suitable manner a
\ securely attached to the shutter housing 3! and
the shutter release lever 39 is held in place by the
screw til. As most clearly shown in Figs. 8 and
10, there is attached to the lower arm 39a of the
shutter release lever
a pin 89 having a shoul
pinion B5 meshing with the shutter rewind gear
66, shown most clearly in Figs. 4, 5 and 8 and in 30 der 88 passing through an opening 9| in the outer
dotted lines in Fig. 3. The said shutter rewind
wall of the shutter plate 3|, The escapement
gear is provided with a‘shaft 51 passing through
lever
made up, as stated, of the lever arms
a bearing 68, best shown in Fig. 9, and which is
Ti,
and 88 is caused to be turned in a clockwise
securely attached to the shutter cover 3!. Also
direction viewing Fig. 4 by means of a spring 92,
?tted to the shaft 61 is a pinion E8 meshing with
best shown in Figs. 4, 5 and 8, and its motion in
a shutter indicating gear 18, such pinion and
a clockwise direction is limited by the pin 89,
gear being shown in full lines in Fig. 9, in full and
best shown in Figs. 4 and 5. The shutter re
dotted lines in Fig. 4, and in dotted lines in Fig. 3
lease lever 38 is caused to be turned in a clock
as mounted on a stub shaft 18a.
Also attached
wise direction, viewing Fig. 3, by a spring 94, best
to the shaft 8'! and to the gear 66 is a dog plate 40 shown in Figs. 4 and 5, one end of such spring
'll_ having dogs l2, 13, such dog plate being at
engaging a side wall of the shutter housing 3| and
tached to the rewind gear 55 by stop pins l4, '15
having reduced diameters passing through the
said dog plate and gear 66, the opposite ends
$13‘? opposite end thereof engaging the said pin
W e will now describe the operation of the cam
of such stop pins being riveted over so as securely 45 era in sufficient detail to make clear the require
to hold the said dog plate to the gear 86.
ments of the synchronizing mechanism yet to be
described.
Pivoted upon a shoulder screw 78, best shown
in Figs. 4, 5 and 8, is a three-pronged lever 15a
The camera herein disclosed is equipped with
that serves as or constitutes an escapement and
the said mirror frame 58 carrying the usual mir
50
is made up‘ of a ?rst arm Ti having a hook 18,
ror for reflecting the image to the ground glass
a second arm l9, and a slightly curved third arm
for focusing. When the mirror frame '50 is in its
80, which latter arm serves to hold the gear '58
normal position, as shown in dotted lines in Fig.
to its stub shaft 18a. The second arm 19 en
3. all light is cut off from the sensitized material
gages the pin 14 or pin 15, whichever one happens
carried
in. the sensitized material holder 25, even
to be in position for such engagement, for holding 55 though a curtain aperture is before (that is, in
the shutter curtain in the set condition, and the
front of) the sensitized material. This makes it
hook T8 of the ?rst arm TI engages the dog 12
possible, without exposing such sensitized mate
or dog 13, depending upon the rotative position
rial, to rewind the shutter for making the second
of the dog plate ‘H. The manner of operation
exposure or for changing the exposure aperture.
60
of the said parts will be subsequently more fully
The camera is equipped with the usual multi
described.
ple~aperture focal-plane shutter, indicated at B0,
Attached to the escapement lever 'l?a is a
and is wound on the tension roller 59, the opposite
spring ?nger 8 I , the purpose whereof is to prevent
or upper end of said shutter curtain being wound
the rewinding of the shutter curtain at any other
65 on the shutter curtain take-up roller 62, The said
than the proper time, and the manner in which
shutter curtain 6!! is, in the disclosed embodiment,
this is effected will be presently fully described.
equipped with ?ve separate different-sized aper
Attached to the shaft 4| carrying the mirror
tures, thus making it possible to obtain many
reset lever 42, most clearly shown in Figs. 9 and
different shutter speeds, and further to increase
10, is a disk 82 having a hub 83 securely held to 70 the number of shutter speeds, the tension on the
the shaft 4| by a pin 84. To the said disk 82 is
tension roller 59 is variable through the operation
suitably attached in any desired manner, as by
of the tension knob 83. The particular tension to
means of rivets 82a, 82a, the mirror or mirror
which the tension knob 38 is set, is indicated in
frame reset lever 42, previously referred to. As
the window 35 of the tension plate 32. The shut
best shown in Figs. 8 and 10- and in end view in 75 ter rewind handle 38 can be turned a sufficient
2,406,691
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distance in a contraclockwise direction to wind
substantially all of the shutter curtain onto the
take-up roller E72. When the shutter curtain is in
such wound-up condition, the narrowest aperture
second arm 19 thereof from the face of the stop
pin ‘M, allowing the gear 65 to turn in a contra
clockwise direction until the dog 12 of the dog
plate ‘H is engaged by the hook 18 of the ?rst
thereof is in position for making an exposure,
and the shutter speed or curtain aperture will
be indicated in the window 95 of the shutter
plate 3!. The shutter curtain can be let down
through the manipulation of the shutter release
arm 11 of said three-pronged escapement lever
76a. The shutter will now be stopped or held
from further travel and will be in the position or
condition shown in Fig. 8, wherein the mirror is
in the fully-up or horizontal condition and the
lever 39 so that other shutter curtain apertures 10 dog 12 is engaged by the hook 18 of the said ?rst
arm ‘ll of said escapement lever 16a.
will be in the position for making an exposure,
As the shutter rewind gear 66 turns contra
and the selected aperture will be indicated in the
clockwise suf?ciently to cause the dog 752 of the
window 95.
dog plate TI to be engaged by the hook 18 of
Another type of exposure, and one with which
this ‘invention is particularly concerned, is called '- the ?rst arm ‘ll of the escapement lever 16a,
said dog 12 will pass under the spring member
the “one-?fth of a second exposure.” Such type
81 of the escapement lever 16a and will cause
of exposure is accomplished by having the shut~
such spring member 81 to be de?ected a su?icient
ter curtain so wound that the wide-open aper
distance outwardly, viewing Figs. 4, 5 and 9, to
ture thereof will be in place before (that is, in
front of) the sensitized material, and this ‘fact 20 permit the dog 12 to pass under the spring ?nger
will be indicated in the window 95, shown in Fig.
3. The exposure is made by ?rst releasing the
mirror frame 53 through the mirror release lever
51, Fig. 3. The said mirror frame 58 thereupon
moves upward, allowing the light to pass through
the lens to the sensitized material, but as the
mirror reaches the top of its stroke or horizontal
position, the shutter curtain 6t will be released
8i, and after said dog ‘l2 has passed under the
end of the spring ?nger 85, such spring ?nger
8i will return to its normal position, thereby
preventing the dog plate I'll and the shutter re
and allowed to close, thus completing the ex
posure. The ?ash bulb in this type of exposure
wind gear 66 from being turned in either direc
tion so long as the mirror frame Ed is held in
the up or horizontal position. When the mirror
frame 56 is reset through manipulation of the
mirror reset lever 42, the horizontal arm 39a
of the shutter release lever 39 will be caused to
should be ignited just after the shutter curtain
86 starts to close. The exposure termed the “one
?fth of a second exposure” is actually timed by
of the engagement of the spring 94 with the pin
89, and the escapement lever 76a with its arms
be moved in a contraclockwise direction because
the length of flash or duration of flash of the
‘11, 19 ‘and M will be caused to turn in a clock
flashlamp.
wise direction under the influence of spring -92,
thus withdrawing the hook ‘it of arm 19 from
the dog 13 and allowing the shutter rewind gear
66 to turn slightly until the stop pin 15 is en
When the camera is used for normal instanta
neous exposure, an aperture other than the full
opening is used, and the sensitized material re
gaged by the said second arm ‘is of the escape
mains covered until the mirror frame 58 reaches
the end of its stroke, at which time the shutter 40 ment lever 76a.
The exposure of the sensitized material will
curtain is released and travels across the exposure
have been made in the cycle just referred to,
opening, thus making the exposure. The shutter
and if the mirror frame 5% is again released, an
curtain cannot again be rewound until the mirror
exposure of a different time length will be made
frame ‘53 is set in the position indicated in Fig. 3.
because a different aperture will now be in
The mechanism for accomplishing the above
place. If, however, the same type of exposure
described operation is as follows:
is desired as that just made, it is necessary to
Referring ?rst to Fig. 4, it will be assumed that
rewind the shutter curtain until the stop pin ‘M
the ‘shutter curtain has been Wotmd up on the
is again engaged by the second lever arm ‘I9 of
rewind roller 62 and that an exposure aperture
the escapement lever 16a. The shutter will
is in place or positioned for permitting an ex~
thereupon be in condition for making an expo
po‘sure, which aperture will be indicated in the
sure precisely the same as the just preceding ex
window 95. The shutter curtain rewind roller 62
posure. Any curtain aperture can be selected for
will be prevented from running down because the
making the different types of exposure either by
pinion 65 meshing with the gear 66 will be pre
winding the shutter rewind knob 38 or through
vented from turning due to the fact that the stop
allowing the shutter curtain to run down while
pin 14 engages the arm 19 of the shutter escape
the mirror is in the set condition, by suitable
ment lever 16a. As the mirror frame 58, indicated
manipulation of the shutter release lever 39.
in Fig. 3, is released by movement of the lever 55'!
Thus any particular aperture that is desired can
previously described, the said mirror frame will
be selected and such selected aperture will be
be caused to swing upward through the action of
indicated through the window 95. The shutter
the spring provided for that purpose and said
indicating gear is meshing with the pinion 68
mirror frame in swinging upward will cause to
is of suiiicient size to make less than one revo
move with it the shaft 4!, the disk .82 and the
lution during the complete run-down of the
‘shutter release bar 85. When said mirror frame
shutter curtain, so that the said gear it carries
50 reaches a point just anterior to the end of its
the several markings indicating the various
travel, the inwardly extending end, member or
shutter speeds or shutter apertures.
projection 86 of said shutter release bar 85 will
The shutter mechanism thus far described con
engage the horizontal arm 39a of the shutter
stitutes one selected embodiment or structure
release lever 39, causing it to be moved in a
clockwise direction viewing Fig. 4, carrying with 70 with which cooperate the features to which our
invention is more particularly concerned, and
it the pin 89 on said arm 39a, and that passes
through a, suitable opening in the plate 3| and
which we will now describe, but other suitable
cooperating embodiments or structures of shutter
engages the ?rst arm 1'! of the three-pronged
mechanism may be employed instead.
escapement lever 16a, causing it to be turned in
Referring now to Figs. 4 to 10, there are at
a contraclockwise‘direction, thus withdrawing the 75
2,406,691
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tached to the shutter plate 3| a contact member
96 and a contact member 91, the former being
provided with an inclined projecting arm 98 and
lamp 49 are connected as just described. The
shutter curtain is set to the open condition as
indicated in Fig. 3. The mirror release lever 53,
shown in Fig. 3, is now depressed, releasing the
the latter being provided with an inclined pro
V
jecting spring arm 99, said arms being shown UK mirror frame 50 which swings upward in a con—
separately in Fig. 6. To the contact arm 98 is
traclockwise direction, viewing Fig. 3, turning
attached a contact point I90, .and to the contact
with it the shaft 4|, the disk 82 and the bar 85.
spring arm 99 is attached a contact point I01,
The inwardly turned member or projection 86
and also a metallic cup I02 into which is ?tted
of the said bar 85 will contact with the horizontal
an insulated button I03. As best shown in Fig. 10 member 39a of the shutter release lever 39, car
10, the contact member 91 is insulated from the
rying with it the pin 89 (Figs. 4, 5 and 8) which
shutter plate 31 by an insulating strip I04, and
will cause the shutter escapement lever 18a to
the said contact members 9'! and 96 are insu
be turned in a contraclockwise direction viewing
lated from each other by an insulating strip I05
Figs. 4 and 5. It will be noted that up to this
and an insulating bushing I06. Such contact 15 time the contact points I00 and IOI are in open
members 96 and 91 and the insulating strips I08
condition.
and I05 are held to the shutter plate 3| by means
The interlock member II3 will be caused to
of the contact studs I01 and I08 and the insulat
follow the said pin 89 because of the action of
ing washer I09. The contact stud I08 passes
spring I I9, thus tending to cause the said inter
through the insulating washer I09 and through 20 lock member II3 to be turned in a clockwise di
the insulating bushing I06 and is riveted over
rection. It is, however, prevented from doing so
the contact member 96, being electrically con
because the arm N5 of the said interlock mem
nected thereto.
The contact stud I07 passes
ber H3 is held from movement by the stop pin
through the insulating washer I09, through an
‘I 5 as said interlock swings in a clockwise direc
insulating bushing IIO, through the insulating 25 tion on bushing II4, but as the shutter rewind
member I04, contact member 91 and washer III,
being riveted over onto said washer III, thereby
securely holding the contact member 91 to the
shutter plate 3| and making contact with the
said member 91 through said washer III. As
best shown in Fig. 10, the insulating washer I09
also serves to hold a cylindrically shaped mem
ber I I2 constituting a receptacle for a connecting
plug, to be referred to.
gear 66 starts to rotate, thereby moving the stop
pin 15 out of the path of the arm II5 of the in
terlockmember, such interlock member will be
allowed to rotate, carrying with it the arm IIB
which will contact with the insulating button I03
carried by the contact spring arm 99, thus causing
the contact points I00 and IOI to be closed, there
by completing a circuit from the battery I23 to
the flashlamp 49. As the shutter curtain is re
Pivoted onto the bushing 88 is an interlock
wound for making a second exposure, the con
member, indicated generally at H3 and shown
tact points I00 and IOI will remain open inas
separately in Fig. '7, which is provided with a
bushing II4, an upper arm II5 having a right
much as the shutter curtain cannot be rewound
unless and until the mirror frame 50 has been
returned to its set condition, shown in dotted
angle bend and a lower arm I I6 having a curved
end IIGa. Separating the said interlock mem 40 lines in Fig. 3, because of the spring ?nger 8|,
Figs. 4, 5 and 8, attached as described to the
ber II3 from the shutter plate 3| is a washer II‘I,
escapement lever 16a and having an interlocking
shown in Figs. 9 and 10, against which the said
function with respect to the operation of the
interlock member H3 rides, such washer being
shutter curtain.
held in place on the bushing 88 by a large head
screw H8. The said interlock member I I3 is
When the mirror frame 50 is in the set condi
caused to be rotated in a clockwise direction by
tion shown in dotted lines in Fig. 3, the arm II6
a spring I I9. The purpose of the interlock mem
of the interlock member H3 is held in the posi
ber is to control the operation of the synchronizer
tion shown in Fig. 4. Therefore, the contact
contacts and to effect the closing of such contacts
points I08 and I 0I cannot be closed when the
at the proper time.
mirror frame 50 is in the said set condition.
The battery case 43 is connected to the contact
In order that the structure and function of the
interlock member H3 and its cooperation with
studs I01, I08 through a cable I20, one end of
the other parts of the mechanism may be entirely
which has a plug I2I for plugging into the series
receptacle of the said battery case and the oppo
clear, we have in Fig. 4 shown the said interlock
member in dotted lines in another position and
site end of the said cable has a plug I 22, previous
ly referred to in describing the cylindrically
have applied radial or like lines, arcs and arrows,
and reference letters so as to make entirely clear
shaped member II2 on the shutter plate 3i, being
the following description of the action.
for the purpose of plugging into said receptacle.
For clearness of description and understand
Using the center of the bushing II4 as an axis
ing, Fig. 3 contains a wiring diagram wherein the 60 a radial line A is drawn and the indicated are
A’ is inscribed by the end thereof. Such are
usual battery is indicated at I23, one end thereof
passes exactly through the right-angle bend of
being provided with a wire i24 that connects to
the arm H5 and touches the pin 1.5, shown in
one terminal of the flashlamp 09, the other ter
Fig, ll. Such position of the pin ‘I5 allows an
minal of such lamp having a, wire I20 connected
thereto and connected to the contact stud IN. 65 extent of circumferential movement of the dog
plate 'II to the dotted arrow line B, and the con
The contact stud I08 has a wire I21 connecting
the other side of the battery I23. If a circuit is
tinuation of the are A’ shows that the lever arm
closed between the contact studs Iill, I08, current
II6 with end II 6a does not make contact with
will flow through the flashlamp 49 and the battery
the insulating button I03 until after the dog plate
I23, causing such ?ashlamp to be ignited. The 70 ‘II starts to rotate.
operation of the synchronizer mechanism is as
The dotted line position of the interlock mem
follows.
ber I I3 in Fig. 4 is that assumed when the mirror
The shutter curtain rewind mechanism is shown
frame 50 has been released but the shutter rewind
in Fig. 4 as in readiness for making an exposure,
gear 66 has not yet started to turn.- Therefore
and the battery case 43 and the bulb of the flash 75 the contacts I00 and IN will not be closed until
2,406,691
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the said shutter rewindv gear 66 starts to rotate
vention being set forth in the following claims.
We claim:
in a contraclockwise direction.
This constitutes
an important feature of the invention inasmuch
1. A photographic camera of the re?ex type
as the closing of the contact will, 50! is actually
caused to occur by the rotation of the shutter
rewind gear 66, but is prevented from occurring
while the mirror frame Si! is in the set condition.
having a containing casing to be opened and
entirely closed, having a focal-plane shutter cur
tain with a rewind roller, having a mirror pivoted
Thus we have provided a movable interlock
near the upper wall of the casing for swinging
upward movement upon mirror release from
focusing position into picture-taking position,
member to close the contacts, the closing of the
contacts being effected through movement of said 10 and having means to release the shutter curtain
by mirror movement to picture-taking position,
interlock member, but such movement of the in
said means to release the shutter curtain in
terlock member is prevented until the shutter
cluding a shutter release lever having a pro
rewind gear is permitted to turn in its shutter
truding pin-like formation, and an escapement
curtain releasing movement, that is, in a contra
H Um lever adapted to be directly engaged and moved
clockwise direction.
by said formation, said escapement lever being
In order to permit of changing shutter cur
positioned to hold, until acted upon, said re
tain apertures through the act of allowing the
wind roller from running down, electrically con
shutter curtain to run down and without causing
trolledphotoflash means including a photoflash
the contact points it?!) and NH to be closed, we
have provided means for actuating the shutter 20 lamp and battery and an electrical circuit at
least partially within said casing and including
escapement lever ‘15a, made up of lever arms 11,
within the casing a switch with two contacts
‘t9 and
without causing movement of the
to be closed to complete the circuit to said lamp,
shutter release lever 39. This we accomplish
and means released for action by the commence
through the provision of a shutter reset button
ment of the running-down movement of the
I28 (Figs. 1, 4, 5 and 8) attached to the ?rst
shutter rewind roller to close said contacts.
arm '51 of the shutter escapement lever 76a, and
2. A photographic camera. of the reflex type
extending through a slot or opening H29 in the
having a containing casing to be opened and en
shutter plate 3!, as shown in Figs. 1 and 3. The
tirely closed, having a focal-plane shutter cur
said shutter escapement lever 'l?a can now be
operated by the said shutter reset button I23, .
thus allowing the shutter curtain to be let down.
Inasmuch, however, as the pin 33 is held in its
downward position, as shown in Fig. 1i, by means
of the spring 94, the arm lid of the interlock
member H3 will also be held in the downward
tain, having a mirror pivoted near the upper wall
of the casing for swinging upward movement
position, thus preventing the closing of the con
tact points Hill and HM.
upon mirror release from focusing position into
picture-taking position, and having means to re
lease the shutter curtain by mirror movement to
picture-taking position, said means to release the
shutter curtain including a shutter release lever
having a projecting pin-like formation, and an
aperture, without causing the ?ashlamp 49 to be
ignited, and also preventing inadvertent ?ash
ing of such '?ashlamp if it is in place prior to
having stop pins to be engaged by said second
arm and having dogs to be engaged by said ?rst
arm, electrically controlled photoflash means in
escapement lever having an arm adapted to be
Thus the shutter curtain may be wound to
engaged by said formation and having another
change a shutter aperture or to allow the shutter
curtain to be run down to change the shutter 40 arm, and a shutter rewind gear and dog plate
cluding a photo?asli lamp and battery, and an
electrical circuit at least partially within said
casing and including within the casing a switch
with two contacts to be closed to complete the
circuit to said lamp, and means released for ac
tion by the commencement of the running-down
hereinbefore described, thus causing the ?ash
lamp to be illuminated at the proper time for 50 movement of the said shutter rewind gear to
close said contacts.
making an exposure. It will be noted, viewing
3. A photographic camera of the re?ex type
Fig. 8, that when the shutter curtain is in the
having a containing casing to be opened and
run-down condition and prior to the resetting
entirely closed, having a focal-plane shutter cur
of the mirror, the contacts it!) and ill! will be
in open condition because interlock member H3 55 tain with a rewind roller, having a mirror pivoted
near the upper wall of the casing for swinging
is held in an inoperative condition by the pin 14.
upward movement upon mirror release from
Thus, if a lamp were placed in the socket when
focusing position into picture-taking position,
the shutter curtain is in this condition, it would
and having means to release the shutter curtain
not be ignited.
making an exposure and when selecting any one
of the several exposure apertures of the shutter
curtain. But when the mirror frame 50 has been
released and the shutter curtain starts to run
down, the contacts will be made in the manner
The synchronizing mechanism herein disclosed 60 by mirror movement to picture-taking position,
electrically controlled photo?ash means includ
is adapted to be built into the standard Graflex
ing a photofiash lamp and battery, and an elec
cameras and provides accurate synchronization
trical circuit at least partially within said casing
of ?ashlamps having a short period of illumina
and including within the casing a switch with
tion, with the employment of the Graiiex shutter 65 two synchronizer contacts to be closed to com
speed of one-?fth of a second. This capability
plete the circuit to said lamp, a shutter release
makes possible the use of less expensive lamps
lever and a movable interlock member control
for making satisfactory ?ash photographs with
ling the operation of the synchronizer contacts
any re?ex camera having a structure like or
and effecting the closing thereof at the proper
similar to that herein disclosed.
70 time, the movement of said interlock member
Having thus described one illustrative embodi
being controlled by movement of said shutter
release lever and said interlock member upon
ment of the invention, it is to be understood that
its own movement acting to close said contacts.
although speci?c terms are employed, they are
4. A photographic camera of the re?ex type
used in a generic and descriptive sense and not
for purposes of limitation, the scope of the in 75. having 9. containing casing to be opened and
2,406,691
ll
entirely closed, having a focal-plane shutter cur
tain with a rewind roller, having a mirror pivoted
12
picture-taking position, said means to release the
near the upper wall of the casing for swinging
shutter curtain including a shutter release lever
having a projecting pin 89, an escapement lever
upward movement upon mirror release from
having arms ‘I1, 19, a shutter rewind gear with a
focusing position into picture-taking position, and
dog plate having stop pins and dogs, electrically
having means to release the shutter curtain by
controlled photoflash means including a photo
mirror movement to picture-taking position, said
flash lamp and battery, an electrical circuit at
means to release the shutter curtain including
least partially within said casing and including
a slidable bar 85 supported at the mirror pivot
within the casing a switch with two synchronizer
to move with the mirror and having a projection
contacts to be closed to complete the circuit to
86, a shutter release lever having an arm to be
said lamp, and a movable interlock member H3
engaged by said projection 86, said shutter re
controlling the operation of the said synchronizer
lease lever having a pin 89, an escapement lever
contacts and effecting the closing thereof at the
having an arm ‘H to be engaged by said pin, elec
proper time, the movement of said interlock
trically controlled photo?ash means including a 15 member being effected by engagement with said
photoflash lamp and battery, and an electrical
pin 89, said interlock member I I3 having another
circuit at least partially within said casing and
arm engageable with a stop pin of the said shutter
including within the casing a switch with two
rewind gear and dog plate.
contacts to be closed to complete the circuit to
8. A photographic camera of the re?ex type
said lamp, and means released for action by the 20 having a containing casing to be opened and
commencement of the running-down movement
entirely closed, having a focal-plane shutter cur
of the said shutter rewind roller to close said con
tain, having a mirror pivoted near the upper wall
tacts.
of the casing for swinging upward movement upon
5. A photographic camera of the re?ex type
mirror release from focusing position into picture
having a containing casing to be opened and
taking position, and having means to release the
entirely closed, having a focal-plane shutter cur
shutter curtain by mirror movement to picture
tain, having a mirror pivoted near the upper wall
taking position, said means to release the shut
of the casing for swinging upward movement
tercurtain including a shutter release lever hav
upon mirror release from focusing position into
ing a projecting pin 89, an escapement lever hav
picture-taking position, and having means to re
ing a plurality of arms, one of which is adapted
lease the shutter curtain by mirror movement to
to be engaged and moved by said pin 89, a shutter
picture-taking position, said means to release the
rewind gear and a dog plate having stop pins
shutter curtain including a shutter release lever
and dogs, electrically controlled photo?ash means
39 having a pin 89, an escapement lever 16a hav
including a photo?ash lamp and battery, an elec
ing an arm ‘(1 to be engaged by said pin 89, and
trical circuit at least partially within said casing
a shutter rewind gear and dog plate having stop
and including Within the casing a switch with two
pins and dogs to be engaged by said escapement
synchronizer contacts to be closed to complete the
lever, electrically controlled photo?ash means in
circuit to said lamp, and a pivoted interlock mem
cluding a photo?ash lamp and battery, and an
ber H3 having a spring H8 to cause said inter
electrical circuit at least partially within said 40 lock member to follow the movement of said pin
casing and including Within the casing a switch
89, said interlock member also having an arm to
with two contacts to be closed to complete the
engage a stop pin of said shutter rewind gear and
circuit to said lamp, and means released for action
dog plate, said interlock member controlling the
by the commencement of the running-down
position of the said synchronizer contacts and
movement of the said shutter rewind roller to
effecting the closing thereof at the proper time.
close said contacts.
9. A photographic camera of the re?ex type ,
6. A photographic camera of the re?ex type
having a containing casing to be opened and
having a containing casing to be opened and
entirely closed, having a focal-plane shutter cur—
entirely closed, having a focal-plane shutter cur
tain, having a mirror pivoted near the upper wall
tain, having a mirror pivoted near the upper wall
of the casing for swinging upward movement
of the casing for swinging upward movement
upon mirror release from focusing position into
upon mirror release from focusing position into
picture-taking position, and having means to re
picture-taking position, and having means to re
lease the shutter curtain by mirror movement to
lease the shutter curtain by mirror movement to
picture-taking position, said means ‘to release the
picture-taking position, said means to release the
shutter curtain including electrically controlled
shutter curtain including a shutter release lever
photoflash means itself including a photoflash
having a projecting pin 89, electrically controlled
lamp and battery, an electrical circuit at least
photo?ash means including a photoflash lamp and
partially within said casing and including within
battery, an electrical circuit at least partially
the casing a switch with two synchro-nizer con
Within said casing and including within the casing
tacts to be closed to complete the circuit to said
a switch with two synchronizer contacts to be
lamp, a movable interlock member controlling the
closed to complete the circuit to said lamp, and
operation of the said synchronizer contacts and
a movable interlock member controlling the op
effecting the closing thereof at the proper time,
eration of the said synchronizer contacts and ef—
a shutter release lever controlling the movement
fecting the closing thereof at the proper time,
of said interlock member, and a shutter rewind
the movement of said interlock member being
gear also controlling the movement of said inter
controlled by the movement of said pin 89.
lock member.
7. A photographic camera of the reflex type
10. A photographic camera of the re?ex type
having a containing casing to be opened and
having a containing casing to be opened and
entirely closed, having a focal-plane shutter cur
entirely closed, having a focal-plane shutter cur
tain, having a mirror pivoted near the upper wall
tain, having a mirror pivoted near the upper wall
of the casing for swinging upward movement
of the casing for swinging upward movement
upon mirror release from focusing position into
upon mirror release from focusing position into
picture-taking position, and having means to re
picture-taking position, and having means to re
lease the shutter curtain by mirror movement to
lease the shutter curtain by mirror movement to
2,406,691
13
picture-taking position, said means to release the
shutter curtain including a shutter release lever,
a shutter rewind gear, electrically controlled
photo?ash means including a photo?ash lamp
and battery, an electrical circuit at least partially
within said casing and including within the cas
ing a switch with two synchronizer contacts to
be closed to complete the circuit to said lamp, and
picture-taking position, electrically controlled
photoflash means including a photo?ash lamp
and battery, an electrical circuit at least partially
within said casing and including within the casing
a switch with two synchronizer contacts to be
closed to complete the circuit to said lamp, a
movable interlock member controlling the opera_
tion of the said synchronizer contacts and effect
ing the closing thereof at the proper time, and
a movable interlock member having formations
cooperating with both said shutter release mem 10 shutter release means and shutter rewind means
both engaging said interlock member, the shutter
ber and. shutter rewind gear, said interlock mem
release means controlling the movement of the
ber controlling the operation of the said syn~
said interlock member and the said shutter re
chronizer contacts and e?ecting the closing therewind means by its movement permitting move
of at the proper time.
11. A photographic camera of the reflex type 15 ment of said interlock member.
14-. A photographic camera of the reflex type
having a containing casing to be opened and
in accordance with claim 1, but wherein the
entirely closed, having a focal-plane shutter cur
escapement lever is provided with a spring ?nger
tain, having a mirror pivoted near the upper wall
8! to prevent rewinding of the shutter curtain
of the casing for swinging upward movement
upon mirror release from focusing position into
picture-taking position, and having means to re
lease the shutter curtain by mirror movement to
picture-taking position, said means to release the
shutter curtain including a shutter release lever
having a projecting pin 88, a shutter rewind gear
escapement
and dog plate
leverhaving
havingstop
a plurality
pins andofdogs,
arms to
engage respectively said 5130p pins and dogs, elec
until the mirror frame is in set position.
15. A photographic camera of the reflex type
having a containing casing to be opened and
entirely closed, having a focal-plane shutter cur
tain, having a mirror pivoted near the upper wall
of the casing for swinging upward movement
upon mirror release from focusing position into
picture taking position, and having means to re
lease the shutter curtain by mirror movement to
picture-taking position, said means to release the
trically controlled photo-?ash means including a
photo?ash lamp and battery, an electrical circuit 30 shutter curtain including a shutter release lever
having a projecting pin-like formation, and an
at least partially within said casing and including
escapement lever having an arm adapted to be
within the casing a switch with two synchronizer
engaged by said formation and having another
contacts to be closed to complete the circuit to
arm, and a shutter rewind gear and dog plate
said lamp, and a movable interlock member hav
ing formations engaging the projecting pin 89
having stop pins to be engaged by said second
arm and having dogs to be engaged by said first
arm, electrically controlled photo?ash means in
cluding a photoiiash lamp and battery, and an
trolling the operation of the said synchronizer
electrical circuit at least partially within said cas
contacts and e?ecting the closing thereof at the
proper time.
40 ing and including within the casing a switch with
two contacts to be closed to complete the circuit
12. A photographic camera of the reflex type
to said lamp, and means controlled by said shutter
in accordance with claim 5, but wherein the
release lever to close said contacts, one or’ the
camera casing has contact plates 96, 5'! with pro—
arms of said escapement lever having a formation
,iecting spring arms 98, 99 respectively, said arm
extending through a suitable opening in the wall
99 having a metallic cup “)2 with an insulating
of the camera casing, so as to be accessible for
button I03, and means for suitably insulating said
manual manipulation, for moving said escape~
plates 96, 8? including an insulating strip Hill
ment lever, thereby to permit changing the cur
to insulate member 9?, a strip I05 and bushing
tain position without closing the contacts.
N16 to insulate said members 95, ill from each
16. A photographic camera in accordance with
other.
claim 5, but wherein the lever arm Ti is provided
13. A photographic camera of the re?ex type
with a pin i528 extending through a suitable slot
having a containing casing to be opened and
in the camera casing, for manual manipulation,
entirely closed, having a focal-plane shutter cur
to permit changing the shutter curtain position
tain, having a mirror pivoted near the upper wall
of the casing for swinging upward movement .-. without closing said contacts.
upon mirror release from focusing position into
IRVING JACOBSO'N.
picture-taking position, and having means to re
HAROLD E. SMITH.
lease the shutter curtain by mirror movement to
of the release lever and a dog or dogs of such
shutter rewind gear, said interlock member con-.
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