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Патент USA US2112606

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March 29, 1938.
Filed June 13, 1956
‘Ill.- llli
artist APLeas' ‘
Patented Mar. 29, 1938
2,112,606 ‘
Ernst Pleas, Mauer, near Vienna, Austria, as
signor of one-half to Hermann Dannowski,
Jackson Heights, N._ Y.
- Application June 13, 1936, Serial No. 85,010
In Austria June 13, 1935
, .2 Claims. icl. 242-104)
Figure 5 shows the two parts mounted ready
This invention relates to devices for developing
‘for insertion and winding of the ?lm.
photographic ?lms commonly known as develop
ing tanks. In the use of such devices,‘ the ?lm
after- exposure in a camera is spirally wound
upon a support such as a spool with the-adjacent
Figure 6 illustrates a modi?cation of a spool
according to the invention.
Similar reference numerals ‘identify similar 5
spiral windings properly spaced from each other. ‘ elements in the dilferent views of the drawing.
Referring to Figures 1 and ,3,‘ these illustrate
and the developing solution poured into the tank. the lower part A of the spool comprising a disc
The developing process may be carried out in a or ?ange I having a spiral guide 9 preferably
dark room or daylight. In the latter case, the formed integral therewith by a thin spiral shaped 10
tank is closed by a light tight cover. After a wall at right angles to the disc surface for'inser
tion and guiding of the film through the ingress
speci?ed developing time dependent on the de
veloper used, the temperature, etc., the solution opening 2. The disc I has a central tubular ex
is poured out and the ?lm ?xed and rinsed in the tension 3 provided with a longitudinal guide
groove I, the purpose of which will be described 15
commonly known manner.
The present invention is speci?cally concerned later. The tube 3 is provided with a plurality of '
with a spool for holding the ?lm to be developed circular _ ‘grooves 5 suitably spaced from each
other conforming to different widths of standard
and has for one of its objects to provide-a de
veloping spool adapted to accommodate different ?lm sizes.
The upper part B of the spool as shown in Fig-'
sizes of ?lms available on the market to avoidthe
necessity of using a different developing device ‘ pres 2 and 4 comprises a disc I1 I provided with a
for each particular ?lm sire. Another; object is spiral guide 9' and an ingress opening 2' sub
to facilitate the insertion and winding of the film} stantially similar'as in the case of part A. The
into a developing spool and to prevent jamming disc I’ has a central extension or sleeve ‘I having
and other drawbacks experienced‘ with similar an inner diameter adapted to ?t snugly over the 25
devices known in the art. Another object is to central tube 3 of part A as shown in Figure 5.
The spool is then placed in a receptacle or tank
The sleeve 1 is provided with a plurality of lon
provide a means to insure free access of the de
veloper to all portions of the sensitive surface " gitudinal slots 6 to secure a certain degree of
resiliency and ensure frictional engagement with
especially to.the' edges of the ?lm to secure uni
the tube 3 of part A. In order to secure the prop- '10
30‘ formly developed negative.
With the ab0ve_objects in view, the ?lm holding
device or developing spool described by this in
vention comprises substantially two disc shaped
‘parts or ?anges mounted upon and spaced by a
central‘ member. The discs are formed with
spiral guides parallel to'each-other for guiding
the ?lm during the winding operation and main
taining adjacent windings properly spaced dur
_ ing thedeveloping process. In order to accom
modate different ?lm sizes, the distance ~between
the discs is made adjustable to conform to the
standard widths of ?lm available on the market.
er alignment of the spiral guides 9 and 9' of parts
A and B and prevent’ relative rotation thereof,
the sleeve 1 is further provided with a longitudi
nal guide I projecting from its inner surface and
adapted to engage the groove 0 of the center tube 35
3 of part A.
In order to facilitate the insertion of the edge
of the film into the spiral guide, the ingress open
ings 2 and 2' to the ?lm guides are formed with
edges tapering ‘gradually from the outer surface 40
of the discs towards the inner surface thereof and
terminating in the spiral guides as shown in the
Another feature consists in the construction of _ drawing. In this manner. the ?lm may be in
the ingress openingfrom the periphery of the serted into the spiral guide even in‘ complete\
gs0r discs to the spiral guide to enable an easy inser
darkness by merely pushing it into the openings 45__
tion and winding of the ?lm even in full dark
2 and 2' until it has been completely wound in
ness- without clogging or jamming. .
side the spool.
These and further objects of the invention will
become more apparent by the followingdetailed
description taken with reference to the accom
panying drawing in which
Figures 1 and 3 are a top and side view, respec
' tively, of one part of the developing spool.
Figures 2 and 4 are a top and side view, respec
tively, of the other
of the developingspool.
In order to lock part B or upper disc in the
different positions corresponding to the particu
lar widths of ?lm used, the,inner surface of
sleeve 1 is furthermore formed with a circular
projection or collar ll (see Figure 2) adapted to
snap into and out of the grooves 5 of tube 3 when
part B or lower disc is moved along the center
tube 3 as ‘shown in Figure 5.
Insome cases it
=hialilitiilriivivpund therein,acentral cylindrical
member extending from one oi said end members.
a sleeve connected to the other member, said
sleeve being adapted to slide over said cylindrical
with thewalls of thespiral Iilid? land O’
member‘ and slotted lonsitudinally to irictionally
engage said cylindrical member, said cylindrical
member being provided with a plurality of cir
cular grooves spaced at predetermined distances.
tuberances ll projecting from the
spiralguideslor l'servingtokeeptheedge
the dim spaced from the guide
free access oi the developer. In
member-sin predetermined relative positions.
2. A developing spool comprising a pair at end
members iormedwithspiral
the developing solution to pass
space between the spiral windings oi the
thediscsland l'aresuitablyprovided
openings or slots in a manner well known.
“ ~ adapt
members having an axial cylindrical sleeve, a
longitudinally slotted sleeve extending from the
other end member and adapted to slidably and
irictionally engage said iirst sleeve, whereby said .
sleeves form a hub for said spool, one of said
for illustration, and ‘that variations and modifi
cations thereof are possible coming within the sleeves bdng formed with a plurality oi’ circular
grooves spaced 'apart by predetermined distances,
broader scope and spirit of the invention as de
,and a collar on the e
surface 0! the other
lined in the appended claims.
Having thus described my invention what I sleeve being adapted to engage said grooves and
claim as newand desire to secure‘by Letters Pat
ent is:
1. A developing spool comprising a pair of end
lock said end members at predetermined axial
distances, and a further longitudinal key and
groove arrangement between said sleeves to pre
vent relative rotary movement thereof.
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