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Патент USA US2500059

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March 7, 1950
I
O, wmEL
2,500,050
CAMERA LENS ATTACHING AND CLAMPING MECHANISM
Filed Jan. '7, 1948
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BY
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INVENTOR
m/M,
WM
ATTORNEY.S‘
- Patented-Mar. 7, 1950'
. 2,500,050
UNr-rao STATES PATENT oFFicsj
2,500,050
,
CAMERA LENS ATTAOHING AND
CLAMPING MECHANISM
. om Wittel, Rochester, N. Y., assignor to sm
man Kodak Company, Rochester, N. Y., a cor
poratlon of New Jersey
’
Application January '1, 1948, Serial No. as; '
4Clalms.
,
l
(01. 88-57)
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-
This invention relates to photography and
tighten the lens mounts-on the supports, and they
more particularly to a mechanism for attaching-and clamping an objective to a support. One
have the disadvantage that the steeper the thread
the more di?icult it is to tighten .the lens on the
'mount. It is customary in removable objectives
' object of my invention is to provide a lens-at
taching mechanism which will ?rmly clamp a
to provide one or more knurled rings for turn
ing parts of the mount as for adjusting focus or
for adjusting a diaphragm; a typical example of
lens mount in a ?xed position on a. support. An
other object of my invention is to provide a lens
attachingvand clamping mechanism which will
> such a lens mount being shown in my U. 8. Pat
tend to prevent accidental removal of the lens
ent 2,180,027, granted November 14, 1939. In
from an accurate operative- position. Another 10 such lens mounts there are frequently pins pro
object of'my invention is to provide a device of ,
iecting into. slots which limit the turning move
the class described whichis simple in construc
ment of given rings and, of course, when the ring
tion, which is‘easy to operate, and comparatively
is turned and reaches the end of the' slot, a ‘very
simple to manufacture. Still, a further object of
material torque may be applied to ‘the lens mount
my invention is to provide a lens-attaching mech 15 as a whole. Thus, the operator may unconscious
anism in which there is little, if any, chance that
‘ly slightly unscrew his lens every time a knurled
a torque applied to the lens barrel will be trans
ring is turnedto one extent of its movement in
mitted to the mount, and ‘other, objects‘ will ap
one direction.
'
pear from the following speci?cation; the novel
My invention is ‘particularly designed to over
features being particularly pointed out in the 20 come these di?iculties. By providing a clamp—
claims at the end thereof.
At the present time there are many cameras
on the market designed to take any' one of ,a
' ing ring which turns freely onv the support, and
by limiting the friction between the ring and the
support, I have been able to provide a lens-clamp
series of different objectives carried in lens
ing device without the use .of looks or latches of
mounts which’ areinterchangeable on the sup 25 any 'kind which overcomes most of the objections
ports to which the lens mounts may be attached. . mentioned above and which will attach and clamp
Usually, the attaching means consists of a simple
an objective in position, both easily and ?rmly,
threaded connection, but there are a number
to such an extent that the objective will remain
of disadvantages insuch a threaded connection
properly seated until removed. '
because it is usually dif?cult, with such a threaded 30 Coming now to the drawings wherein like ref
mount, to keep the objectivewith the lens mount ‘ erence characters denote like-parts throughout:
properly seated on the locating pad of its sup
Fig. 1 is an enlarged fragmentary section, part
port whileusing the camera. I have found that
in elevation, showing a typical lens mount at
most of the difiiculties occur because of a torque
tached to a typical support with a latching and
applied to the lens mount,‘ as, for instance, in 35 clamping mechanism constructed in accordance
setting the diaphragm of the lens mount or set
with and embodying a preferred form of my in
ting the objective at a given focal distance and
vention;
that this torque is applied to the lens'mount as
Fig. 2 is an enlarged fragmentary section taken
a whole. Even though lens mounts are usually lo-v
on line 2-2, of Fig. 1; and
Fig. 3 is a'fragmentary sectional view of the
mitted by this pin and slot permits repeated
support without an objective in place and with
movementsof the lens mount to slightly un
the spring washer'in its normal un?exed position.
screw the threaded connection without the op
This invention‘ consists broadly in providing a
erator- knowing that this occurs. The resulting
support with a lens-attaching and clamping
pictures, of course, become more and more out 45 mechanism which consists of a threaded ring
of focus as the lens is unscrewed more and more, _
mounted to turn freely on the support; this
and spoiled pictures result, even if the lens is
threaded ring being carried on the support which
not unscrewed far enough to be released from‘
also includes a locating pad on which the lens
the camera.
mount is seated. Most of the friction between the
This action is particularly noticed where the 60 locking ring and the support is eliminated, or at
thream, connecting the lens mount and its sup
least reduced to such an extent that friction be
cated by a pin and slot, the slight movement per
port‘, are multiple threads, such as double, triple,
40
. tween the threaded area of the ring and a mating
or ‘quadruple threads, as are frequently used in
threaded area of the objective will be sumcient
suchvlens mounts. The multiple threads have the
to cause the lens mount and ring to turn to
advantage of requiring less are of movement to 65 gether insofar as this turning movement can take
2,500,050
place, because of the locating means which may
be a pin and slot.
-
'
More specifically, in the present instance in Fig. i
4
theless enough, particularly when turned a large .
number of times to move the locating pad I from
the locating pad I. With my improved construc
tion'since any oscillatory movement of the lens '
1 I vhave illustrated a typical support I which
may be a tubular support, or it may form a front 5 mount will be immediately transmitted to the ring
I3, which may turn on the balls I0 without alter
tubular extension of a camera wall 2. Into the
tubular member I there is threaded at 3 an annu
lar member 4. This member is provided with a
cylindrical portion 5 of a size to telescopically fit
the cylindrical portion 6 of a lens mount ‘I. Thus,
the lens mount and tubular support are held in
axial alignment by these two telescoping por
tions. The cylindrical member 4 is provided with
a locating pad 8 which, in this instance, is a care
fully turned surface on the end of the tubular
member against which a shoulder 9 on the lens
mount ?ts; this shoulder 9 serving as a locating
pad for the lens mount. When the pads 8 and 9
lie against each'other, as in Fig. 1, the lens mount
‘I is in the proper position with respect to the
tubular support ‘I to provide an image accurately
in the focal plane of a camera, as is well known.
The ring member 4 is provided with a portion of
a ball race in the form of an inclined wall I8. A
plurality of balls I0 lie in this ball race and the
ball race includes walls II and I2 formed in a
locking ring I3. This locking ring is provided
with a threaded member I4 which may engage
mating threads I5 on the lens mount ‘I.
The locking ring is mounted to turn freely on
the balls of the ball race and I prefer to provide a
spring washer I6 against one wall (here shown as
wall I2 of the ball race); this washer normally
lying in a plane but being movable from this plane
ing its position axially with respect to the support
I, such movement of the lens mount does not
dislodge the locating pads, nor will not permit
the objective to become accidentally unscrewed.
In detaching the lens mount 1 from the sup
port I, the ring I3 is turned in a direction to re
lease the mating threads II and I5 and the lens
may he slid away from its support. When the
lens is released, the spring washer I6 will move
into its normal plane position and it will serve
to prevent the ring I3 from rattling or turning
too freely on the support I, as in Fig. 3.
When placing a lens mount on the support, as
soon as the balls engage the spring washer I.
and it starts to ?ex, it applies a light load which
tends to prevent undue stress being suddenly ap
plied to the locating pads 8 and 9. These pads, of
course, are very accurately finished and it is de
sirable to provide a means for attaching a lens
which will not mar or otherwise harm the ac
curacy of these contacting surfaces. The spring
washer II; also gives the operator some latitude in
the degree of torque which must be applied with
the ring I3 to firmly hold the lens mount‘! in
place.
While not so often used, my improved lens
mount is useful where the lens does not have a
locating pin 20 to locate the lens mount on the
when ?exed by pressure between the balls III and 35 support by entering a notch 2| in the support I.
The lens mount locating pad 9 may engage the
the walls of the race, as indicated in Fig. 1. Fig.
locating pad 8 of the support, and may be turn
3 shows the spring washer I6 un?exed and tending
able thereon. Here, again, reducing friction be
to hold the locking ring I3 against support I in
tween the locking ring I3 to a value below that
a normal position of rest.
’
between the threads I 4 and I5 permits the lens
In attaching the lens mount to the camera,
mount to be turned with pads 8 and 9 in contact
the tubular portion 6 is inserted in the tubular
and without the threads II and I5 loosening be
mount I along the axis "A” and when the locating
cause the locking ring I3, turning on balls I0,
pads 8 and 9 are brought opposite to each other
turns with the lens mount.
and seated, one upon the other, the lens mount is
Having now described my invention what I
in an operative position. To reach this position,
desire to secure by Letters Patent of the United
the threaded ring I3 is turned so that the threads
States and what I claim is:
I4 may draw the mating threads I5 inwardly until
1. Attaching means for holding a threaded lens
the locating pads are in engagement. As the ring
mount including a locating pad and a threaded
I3 is gradually tightened, pressure is applied to
sleeve to a tubular support comprising a support,
the spring washer I6, ?exing the washer so as to
a locating pad on the support, telescoping sleeves
produce a smooth gradual tightening movement,
on the lens mount and support for axially posi
and so that it will not be necessary to apply so
tioning the lens mount on the support, a locking
much pressure to the balls to lock the ring against
ring mounted on the support having a thread
the support I. The ‘ring may always move rel
ative to the support I because the friction has . mating with the threaded lens mount, and a plu
rality of friction reducing means included in the
been limited to such an extent that the friction
mount and engaging the locking ring for limiting
between the threads I4 and I5 will move the ring
the friction between the ring and the mount to a
I3 with the lens mount ‘I together as a single ele
value below the friction between the threaded lens
ment; this movement being permitted by the balls
I0.
60 mount and its mating thread on the ring to pre
vent the threads from unscrewing by a torque ap
As is customary, the lens mount ‘I is provided
plied to the lens mount.
with a pin 20 which enters a slot 2I in the ring
2. Attaching means for holding a threaded
member 4; the purpose of this being to locate the
lens with a focusing scale, for instance, 22, or a
lens mount including a locating pad’ and a
pointer 23, in a given position with respect to the 65 threaded sleeve to a tubular support comprising
support or camera body. The pin 20 may inac
curately ?t the slot 2| and this is particularly
true where the objectives may be made by var
ious different manufacturers. Accordingly, some
slight play is permitted between the pin and slot
and in constantly using an objective and apply
ing a torque to it, each time the torque is applied
in an unscrewing direction, without the ring I3 be
ing movable, the threaded connection would per
mit the parts to turn only a small angle but never 76
a support, a locating pad on the support, tele
scoping sleeves on the lens mount and~ support
for axially positioning the lens mount on the
support, a locking ring mounted on the support
having a thread mating with the threaded lens
mount, and means included in the mount and
engaging the locking ring for limiting the frIc-'
tion between the ring and the mount to a value
below the friction between the threaded lens
mount and its mating thread on the ring to pre
3,500,050
5
6
‘vent. the threads from unscrewing by a torque ap
plied to the lens mount, said means including a
ball race having walls carried by the support and
the locking ring, and a plurality of balls carried
by the ball race.
4. Attaching means for holding a threaded lens
mount including a locating pad and a threaded
sleeve to a tubular support as de?ned in claim 1,
characterized by the means included in the mount
and engaging the locking ring for limiting the
friction between the ring and mount including a
'
3. Attaching means for holding a threaded lens
mount including a locating pad and a threaded
spring holding the locking ring against the sup
sleeve to a tubular support comprising a support,
port when in an inoperative position and when
a locating pad on the support, telescoping sleeves '
a lens mount is not attachedto the support.
on the lens mount and support for axially posi
tioning the lens mount on the support, a locking
‘
ring mounted on the support having a thread
'
O'I'I'O WI'I'I‘EL.
REFERENCES CITED
mating with the threaded lens mount, and means
The following references are of record in, the
included in the mount and engaging the locking
ring for limiting, the friction between the ring 15 ?le of this patent:
and the mount to a value below the friction be
tween the threaded lens mount and its mating
UNITED STATES PATENTS v
Number
thread on the ring‘to prevent the threads from
unscrewing by a torque applied to the lens mount,
1,734,438
1,848,402
2,172,338
2,180,027
said means including a ball race having walls 20
carried by the support and the locking ring, and
a plurality of balls carried by the ball race, and a
spring lying between the balls and one race tend
ing to ?ex as the lockingring is turned to hold ‘
thelens mount on the support.
26
.
Name
Date
Koehler __________ __ Nov. 5,
Wollensak ________ __ Mar. 8,
Mihalyi __________ __ Sept. 5,
Wittel __________ __ Nov. 14.
1929
1932
1939
1939
2,279,476
Mihalyi __________ __ Apr. 14, 1942
2,287,468
Cisski __________ __ June 23,1942
2,293,592
, Cisski ____________ __ Aug. 18, 1942
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