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Патент USA US2110356

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Maid! 8, 1938.
c. F. CUNNINGHAM
2,110,356‘
ATTACHMENT FOR PHOTOGRAPHIC DEVELOPING TRAYS
Filed Aug. '7, 1937
ITZ/UC7L1L/O7i'
C07 *IzeZzLus I.’ 6247 uzzkg/ma,
2,110,356
Patented Mar. 8, 1938
UNITED STATES
PATENT OFFICE '
2,110,356
ATTACHMENT FOR PHOTOGRAPHIC DEVEL
OPING TRAYS
Cornelius F. Cunningham, Canton, Mass.
Application August 7, 1937, Serial No. 157,831
6 Claims. (Cl. 95—94)
Like numerals refer to like parts throughout
This invention relates to an attachment for
photographic developing trays and particularly the several views of the drawing.
to a device for holding a photographic ?lm sub
merged in the developing liquid during the proc
5 ess of development and while said ?lm is being
moved back and forth through said liquid.
Devices have been provided for the purpose
of holding photographic ?lms submerged during
development and in certain instances these de
vices have had a roller embodied therein beneath
which a ?lm may be drawn back and forth in
a manner and for a purpose well known in the
art. The devices mentioned, however, have been
constructed'in such a manner that they neces
15 sarily must be attached to the sides of the devel
oping trays; but trays provided for this purpose
are of many styles and sizes and have sides of
various heights and inclinations, and where a
device must necessarily be attached to the sides
of a tray not all of these devices can be satisfac
torily applied to the different styles of trays to
occupy a desired position therein.
The primary object therefore of this inven
tion is to provide a device having a roller em
25 bodied therein and adapted to be detachably se
cured to the bottom surface of a developing tray
at any desired location therein and in a manner
to effectively maintain a photographic ?lm sub
merged in the developing liquid a predetermined
distance from the bottom of the tray while said
?lm is being moved back and forth beneath said
roller.
Another object of the invention is to provide a
means located adjacent to the roller whereby
35 a strip of ?lm may be severed from a strip of
paper to which it is attached.
Still another object of the invention is to uti
lize suction devices in the form of vacuum cups to
secure the device of the invention to a develop
ing tray, said cups having annular ?anges em
bodied therein which are utilized to guide the
photographic ?lm beneath the roller.
The invention consists in an attachment for
photographic developing trays as set forth in
45 the following speci?cation and particularly as
pointed out in the claims.
Referring to the drawing:
Fig. 1 is a plan view of an attachment for
photographic developing trays embodying my in
50 vention, a portion only of a tray being illustrated.
Fig. 2 is a front elevation, of the device at
tached to a tray, a portion of one suction member
and the tray being illustrated in section.
Fig. 3 is a vertical transverse section taken on
55 the line 3--3 of Fig. 2.
In the drawing, A represents a photographic
developing tray of a type well known in the art,
and B is a device of this invention secured to a
UT
smooth bottom surface 5 of said tray between the
side walls thereof. The device B embodies there
in a pair of suction or vacuum members 6 con
structed of a suitable resilient material, as for
example, ?exible rubber, having cup portions 1 10
formed integral therewith which are concavo
convex in form and which are adapted to be
attached to the smooth bottom surface 5 of the
tray A by applying pressure to said members to
cause said cup portions to be flattened against 15
said smooth surface and then releasing said
pressure, all in a well-known manner.
The cup
portion 1 of the suction members 6 has an up
standing annular flange portion 8 extending
therearound adjacent to the outer edge portion 20
thereof which serves as a guide for the photo
graphic ?lm in a manner hereinafter to be de
scribed.
'
Mounted upon each suction member 6 is an
angle bracket 9 which is secured to said member 25
by a screw Ill and thumb nut H, the screw l0
being anchored in the member 5 and projecting
upwardly therefrom. A portion I2 of the brack
et 9 projects downwardly and is utilized as a sup
port for the end portion of a rod l3 which is 30
mounted at its opposite ends in the oppositely
facing portions I2 of said bracket 9, and said rod
constitutes a bearing for a roller M which is
mounted to rotate freely thereon. The portion
l2 of the bracket 9 also projects behind the an
nular flange 8 in a manner to flatten out and rein
force said ?ange at I5 adjacent to the ends of
the roller l4, thereby providing reinforced guide
surfaces upon the suction members 6 between
which a strip of photographic ?lm is moved back 40
and forth through a developing liquid located
within the tray A and in which the ?lm is held
submerged by the roller Ill. The roller l4 also
prevents the film from curling during develop
45
ment.
Also mounted upon the suction members 9 and
conveniently positioned above the roller l4 in a
position to co-operate therewith is a knife 16
having a cutting edge I‘! which extends parallel
to the periphery of said roller at a location where
a strip of sheet material, as for example, the
strip of paper which is attached to the strip of
photographic ?lm, upon passing beneath the roll
er l4 may be presented to said cutting edge I‘!
in a manner to be effectively severed from the 55
2
2,110,356
film, said roller holding said strip of paper posi
tioned to be easily contacted with said cutting
edge. The knife 16 is held securely clamped to
the brackets 9 by means of the thumb nuts I l.
The device B of this invention may be posi
tioned at any desired location Within a developing
tray A and effectively secured to the bottom sur
the suction members provided with a cutting edge
extending parallel to the axis of said roller.
3. The combination with a photographic de
veloping tray of a pair of vacuum cups adapted
to be secured by suction to the bottom surface of
said tray, and a roller mounted upon and be
tween said vacuum cups and adapted to hold a
face thereof by pressing downwardly upon the
thumb nuts I l, and after having ?attened the cup
10 portions 1 against the bottom surface 6 of said
photographic ?lm submerged in a liquid in said
tray, ?nally releasing the pressure, whereupon the
prising a pair of vacuum suction members adapted
to cling to a smooth surface, each of said mem
device will be ?rrnly secured to the tray by suc
tion created in a well-known manner. The roller
I 4 of the device, secured as it is to the bottom
15 surface of the tray, will always be located a pre
determined distance from said bottom of said
tray, and the amount of developing liquid re
quired to cause the photographic ?lm to be sub
merged in said liquid may be easily determined.
In moving the ?lm back and forth through the
developing liquid beneath the roller M the sur
faces l5 formed by ?attening out the ?anges 8
of the suction cups 7 act to guide said ?lm and
hold the latter beneath said roller. The knife 16
and roller M are secured to the suction members
simultaneously by means of the thumb nuts II,
and said knife and roller are so positioned rela
tively to each other that they co-operate one
with the other in enabling the strip‘ of ?lm to be
30 effectively severed from the strip of paper to
which it is attached.
I claim:
1. A device for guiding sheet material com
prising a pair of vacuum suction members adapted
to cling to a smooth surface, each of said mem
bers having an upstanding guide portion pro
vided thereon, and a roller mounted at opposite
ends thereof upon said suction members between
said guide portions.
4.0
2. A device for guiding sheet material com
prising a pair of vacuum suction members adapted
to cling to a smooth surface, each of said mem
bers having an upstanding guide portion em~
bodied therein, a roller mounted at opposite ends
thereof upon said suction members between said
guide portions, and a knife also mounted upon
tray.
'
4. A device for guiding sheet material com
10
bers having an annular ?ange portion extending
therearound and projecting upwardly therefrom,
and a roller mounted at opposite ends thereof 15
upon said suction members, said ?ange portions
being adapted to guide a strip- of sheet material
beneath said roller.
5. A device for guiding sheet material com
prising a pair of vacuum suction members adapted
to cling to a smooth surface, each of said mem
bers having an annular ?ange portion extending
therearound and projecting upwardly therefrom, a
bracket fast to each of said members and en
gaging the ?ange thereof to provide a reinforced 25
guide portion upon the suction member, and a
roller mounted at opposite ends thereof upon said
brackets between said guide portions, the latter
being adapted to guide a strip of sheet material
beneath said roller.
'
30
‘6. A device of the character described com
prising a pair of vacuum suction members adapted
to cling to a smooth surface, each of said members
having an upstanding annular ?ange extending
therearound, a bracket fast to each of said mem
bers and engaging the ?ange thereof to provide a
reinforced guide portion upon the suction mem
ber, a roller mounted at opposite ends thereof
upon said brackets between said guide portions,
the latter being adapted to guide a strip of sheet
material beneath said roller, and a knife mounted
upon the suction members and provided with a
cutting edge extending parallel to the axis of
said roller.
CORNELIUS F. CUNNINGHAM.
45
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