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Патент USA US2137502

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Nov. 22, 1938. ‘
H. NERWIN
2,137,502
FILM SPOOL FOR PHOTOGRAPHIG CAMERAS
Filed Oct. 8, 1937
. F/y/
Mum/0r:
' ?ier? Mill/[:72
Patented Nov. 22, 1938
UNITED STATES PATENT .OFFICE'
2,187,502
FILM SPOOL FOR PHOTOGRAPH“) CAM
ERAS
\
'
- Hubert Nerwin, Dreaden-Seidnitz, Germany, as
aignor to Zeiaa Ikon Aktiengeaelllchatt, Drea
dcn, Germany
Application October a, 1937, Serial No. 168,085 ‘
In Germany October *6, 1938
_
spools for photographic cameras.
It is an object of the invention to provide a ?lm
spool into which the end of the ?lm or leader at5 tached thereto may be more readily inserted than
‘
15
20
,
6 Claims; (Cl. 242-74)
This invention relates to improvements in ?lm
10
I‘
Fig. 2 is partly front elevation and partly sec
tion, and
' Fig. 3 is a sectional view on line 3-3 of Fig. 2.
The ?lm spool comprises a body i made of suit
able material and having ?anges 2 and 3 which 5
in the ?lm spools in use at the present time.
are spaced from each other a distance corre
Most of the ?lm spools in use are provided
with a body of cylindrical shape having a transverse slit in a plane parallel to the axis of the
body. The insertion of the end of the ?hn into
this slit had been di?icult, particularly in the
dark-room, and it had been customary to trim
down the end of the ?lm to make the insertion
somewhat easier. This reduction of the ?lm in
width obviously could be carried out solely by
sacri?cing a portion of the ?lm which otherwise
would have been available for pictures. ‘The loss
is especially noticeable in ?lms for miniature
cameras as they have become very popular recently. This reduction of the ?lm in width by
scissors or the like also had to be carried out in
the dark-room, and hence also was an operation
which the average camera user could not per-
sponding approximately to the width oi.’ the ?lm,
not shown in the drawing. This ?lm spool may
have at one end an extension 4 with a coupling
socket 5 for the driving mechanism (not shown) 10
and may be provided at the other end with a
socket 6 in which a key for positioning the ?lm
spool may be located.
The main portion or the body -I is spaced from
a tongues which extends from one end of the 15
body to a point short of the opposite end, thereby
leaving between the main portion of the body I
and the tongue 8, a slit]. As shown in the draw
ing this slit is inclined somewhat to the axis of
the body to make it easier to push the ?lm into 0
the slit transversely to the ?lm.
Owing to this arrangement the ?lm does not
have to be threaded transverselythrough the body
form very readily.
but may be inserted substantially longitudinally
Y
25
The present invention has the object of elimihating the necessity of trimming the end and of
threading the ?lm through a transverse slit.
The object of the invention may be described
as providing aholding tongue equidistantly spaced
30 from the main portion of the?lm body, but
shorter than the latter, to permit insertion of '
the ?lm transversely to its length into the inter-
space.
The invention also has the object of providing
35 a ?lm spool withabody having aslit which opens
longitudinally of the body at one end, permitting
thereby at the open end the insertion of the ?lm
transversely to the length of the ?lm.
Another object of the invention is to facilitate
40 the insertion of the ?lm by providing a slit which
in its entirety extends at a slight angle to the
axis of the spool body and opens into the circumference of the body along an uninterrupted
line extending from one end of the slit to the
45 other.
_
a
of the body from the open end of the slit 1 so 25
as to project from opposite sides of the same,
whereupon by rotation of the body, the ?lm may
be ?rmly wound thereon in the ordinary way.
This insertion substantially longitudinally of the
body may be carried out in complete darkness 30
much more easily than the threading operation
involving the passage of the end of the ?lm or
leader transversely through the body.
An additional means may be provided in the
interior of the slit for holding the ?lm end in 35
position. Many ?lms in use at the present time,
especially ?lms for miniature cameras, are pro
vided with marginal rows of sprocket holes. At
least, one of the walls of the slit 1 is shown to
have a projecting lug 9 of a size to engage a 40
sprocket hole of the ?lm, not shown, whereby
the ?lm is adapted to lock itself in position against
longitudinal movement in either direction.
The arrangement of this slit does not require
a reduction of the ends of the ?lm for insertion. 45
It is, furthermore, an object of the invention
to provide a spool for perforated ?lms in which
the slit itself is equipped with means for locking
The user also avoids the risk of inserting the ?lm
at an angle to its longitudinal axis-a danger
which was present whenever a reduced portion
the ?lm in position.
.
With these and numerous other objects in view,
of the ?lm was threaded in darkness through a
transverse slit.
.
50
an embodiment of the invention is illustrated in
the accompanying drawing to which reference is
made in the following speci?cation.
In the drawing:
55
Fig. 1 is a side elevation ofthe ?lm spool;
In Fig. 3 this slit 1 is shown as extending along
an arcuate line through the body I of the spool.
This is of advantage, but it is obvious that this
transverse curvature of the slit is not essential.
The arrangement of a tongue extending in spaced 55
50
2,197,509
2.
relation from one end oi’ the body to a point
remote from the other end. will provide a slit
into which the ?lm may very easily be pushed
in a direction longitudinal to the axis of the body.
while the drawing shows and the speci?cation
describes a preferred embodiment of this in
vention, the latter is not to be limited to any
01' the details shown herein, and many other modi
?cations may suggest themselves as being within
10 the scope of the appended claims.
~
I claim:
1. A ?lm spool having a body provided with
axially spacedv?anges and a slit for the inser
tion or the ?lm, said slit extending at an angle
15 to the axis of rotation 01' the body, starting at
the circumference 01' said‘ body between said
?anges and terminating at one oi’ said ?anges,
and means extending into said slit adjacent said
last named ?ange for engaging a hole oi‘ the ?lm
inserted in said slit.
‘
2. A ?lm spool having a‘ body provided with
axially spaced ?anges and a sIit-i’or-the inser
tion of the ?lm, said slit extending at an angle
to the axis of rotation of the body without inter
25 secting said axis of rotation, starting at ‘the cir
cumi'erence of said body between said ?anges and
terminating at one of said ?anges, and means
extending into said slit adjacent said last named
?ange for engaging a hole of the ?lm inserted
30 in said slit.
3. A ?lm spool having a cylindrical body pro
vided with axially spaced annular ?anges and a
slit for the insertion of the ?lm,~said slit extend
ing at a slight angle to the axis of rotation of
35 the spool and being arranged completely on one
slit iorthe insertion of the ?lm, said slit extend
ing at’ a slight angle to the axis oi rotation of the
spool and being arranged completely on one
side of said axis, starting at the circumference
of the body between said ?anges and terminat
ing at one 01' said ?anges. was to form from
a portion of said cylindrical body a tongue-shaped '
member supported by one oi.’ said ?anges and sep
arated from the other portion 01' said cylindri
cal body by said slit, and a projection extending
from said tongue-shaped member adjacent its
supporting ?ange into said slit for engaging a
hole of the ?lm inserted in said slit.
5. A ?lm spool having a cylindricalbody pro-\
vided with axially spaced annular ?anges and a
slit for the insertion of the ?lm, said slit ex
tending at a slight angle to the axis of rotation
01' the spool and being arranged completely on
one side or said axis, starting at the circumfer
ence of the body between said ?anges and termi 20
nat
at one of said ?anges, so as to form from
aportion of said cylindrical body a tongue-shaped
member supported by one of said, ?anges and
separated from the» other portion of said cy1in-~
drical body by said slit, and a projection extend
ing from said tongue-shaped member adjacent
its supporting ?ange into said slit but remaining
spaced from the opposite portion of said cylin
drical body for engaging a hole 0! the ?lm in
serted in said slit.
_
6. A ?lm spool having a cylindrical body pro
vided- with axially spaced annular ?anges and
a slit tor the insertion oi‘ the ?lm, said slit ex
tending at a slight angle to the axis of rotation
of the spool and being arranged completely on 85
side of said axis, starting at the circumference
one side 01' said axis, starting at the circumfer
at one of said ?anges, and a projection extend
ing into said slit at a right angle to the axis of
ence of the body between said ?anges and termi
nating at one or said ?anges, so as to form from
a portion of said cylindrical body a tongue
said body and adjacent said last named ?ange
shaped member, and a projection on the inner
or the body between said ?anges and terminating
for engaging a hole of the ?lm inserted in said \ face 01' said tongue-shaped member adjacent said‘ 40
slit.
last named ?ange for engaging a hole, of the
4. A ?lm spool having a cylindrical body pro
?lm inserted in said slit.
vided with axially spaced annular ?anges and a
HUBERT NERWIN.
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