close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2108982

код для вставки
Feb. 22, 1938.
J. EGGERT ET AL
4 2,108,982
APPARATUS FOR DEVELOPING FILM IN DAYLIGHT
Filed Jan. 22, 1936
2 Sheets-Sheet l
1:9; 6
Jo/zn é’g/gert '
Fri? Lufi
In ven fors
By ?re/‘r Afforneys
#(g; “at 3.152;“
Feb- 22, 1938.
2,108,982
J. EGGERT ET AL
APPARATUS FOR DEVELOPING FILM IN DAYLIGHT
Filed Jan. 22, 1936
2 Sheets-Sheet 2
/72
John
Epqrgert
i7’ i9 Luft
In ven fors
By. their A?omeys
Patented Feb. 22, 1938
2,108,982
UNITED STATES PATENT OFFICE
2,108,982
APPARATUS
FOR DEVELOPING FILM IN
DAYLIGHT
John E‘ggert, Leipzig-Gohlis, and. Fritz Luft, Leip
zig, Germany, assignors to I. G. Farbenindus
trie Aktiengeseilschaft, Frankfort - on - the—
Main, Germany
Application January 22, 1936, Serial No. 60,186
In Germany January 24, 1935
5 Claims.
5
wrapped in a protective paper and made into a
day-light.
for the sake of clearness. a1 and cm are the two
?lms, b is the paper strip and c is a metal in
One of its objects is an apparatus for develop
ing dental ?lm in day-light which is simple in
construction and efficient in use.
Further ob
jects will be seen from the detailed speci?cation
following hereafter. Reference is made to the
10 accompanying drawings in which:
Figs. 1 and 2 show a package of dental ?lm
intended for use with the developing apparatus
according to this invention,
Fig. 3 shows a side View of a developing appa
15 ratus in accordance with this invention,
Fig. 4 shows a front view of the developing
apparatus shown in Fig. 3, and
Fig. 5 shows a section through a developing
apparatus in accordance with the invention on
20 the line 5—5 of Fig. 4.
Fig. 6 shows a vessel for receiving the process
ing baths.
Fig. 7 shows a section on the line 'l—'! of
25
Fig. 5.
With the apparatus according to the present
invention it is possible to remove dental ?lms,
that is to say, out ?lms without a tab in day
light, from a light-tight package, and to intro
duce the cut ?lms each separately in a developing
3 O vessel without the necessity of performing these
operations in a dark room. Apparatus for de
veloping cut ?lms have already been described,
but these apparatus are only applicable to cut
?lms provided with tabs or similar devices, which
35 made necessary a particular drawing-off device.
The apparatus in accordance with this inven
tion allows the dentist to have at hand in a very
short time a ?nished X-ray picture on two or
4O
(Cl. 95—90)
This invention relates to an apparatus for de
veloping ?lms in day-light and more particularly
to an apparatus for developing dental ?lm in
more simultaneously developed ?lms which were
together in a common package, without the use
of a dark room. The apparatus will be de
scribed with reference to the accompanying
drawings. In the apparatus shown in Figs. 3 to 5
45 the dental ?lm is inserted after exposure in
packed condition in day-light and after closing
the apparatus, the ?lms are introduced into a
light-tight room in which the ?lms are developed
by immersing the apparatus in the different
50 photographic treating liquids.
dental ?lm package.
Figs. 1 and 2 are shown of exaggerated breadth
sertion against the closure. The external wrap
per d has the closing ?ap (11 outside the pro
tective strip 1) (in); this forms the outer layer
on the closure side against the metal sheet 0.
The dotted line d2 is a sealing sheet which is
gummed to the packet and prevents automatic
opening. After removing this sheet (12 and bend
ing back the ?ap d1 of the external wrapper
(Fig. 2), the end D1 of the protective strip is
turned down and inserted through the openings
0 of the antechamber e (Fig. 5) of the develop
ing apparatus where it is clamped in such a man
ner that as the strip 17 is withdrawn the ?lms
fall successively into the developing chamber h.
The ?lms freed from the light-tight package 20
are introduced into the developing chamber h
(Figs. 3 to 5). An opening g made light-tight
by a lining with velvet serves for drawing off the
protective paper strip 1) by pulling the end In.
The apparatus operates in the following manner:
If the fold of the strip b which envelopes the
?lm a2 is pulled off the developing apparatus, the
said ?lm falls into the chamber hi which is
opened for its reception by suitable adjustment
of the ?ap’ i by means of the lever 70.
If now
the developing chamber ha is opened by turning
the lever 7c correspondingly, the ?lm a1 falls into
this second chamber 722 when further pulling the
protective paper strip b1. Thus the two ?lms
can be developed each in a separate chamber. 35
Figs. 4, 5 and 7 show an example of the con
struction of a developing apparatus, e is the
antechamber for receiving the ?lm packing and
is connected with the lower part h of the appa 40
ratus by means of a slot fthrough which the
?lms fall one after the other in the chambers
hi and ha into which the lower part h is divided by
the wall q, when pulling the protective paper strip
b (Fig. 5). The ?lm pack which in Figs. 1 and
2 has been shown in a drawn out condition for
the sake of clearness is shown in dotted lines in
Fig. 5; with its other part it protrudes through
a slot u of the casing e and the casing e is
In the develop~
protected from the entrance of light by means
ing apparatus a number of separate chambers is
provided corresponding with the number of ?lms
to be developed.
In Figs. 1 and 2 there is shown for example
of washers of felt or velvet. The chambers hi
and hz can be closed by means of ?ap i (Fig. 5)
which can be actuated by means of a lever is.
These chambers are provided with ledges t or the
55 the manner in which two dental ?lms are
like which prevent adhesion of the ?lms to the 55
2
2,108,982
wall.
As is shown in Figs. 5 and 7, the ?lm a2 is
slightly larger than the distance between the
ledges if, so that these latter prevent the ?lm
from touching the wall. The chamber h is pre
vented against the entrance of light by means
of a chamber Z which is made light-tight in the
usual manner by means of oppositely directed
bailles m.
The upper chamber 6 can be opened
by turning the part w around the hinge n (Figs.
10 3 and 4).
When two ?lms a1 and (12 have been brought
into the two developing chambers in and 7L2 re
spectively, the whole device is immersed in the
vessel containing the developing or ?xing or
washing liquid.
Advantageously for providing
for the different developing and washing liquids
to be used in the vessels (Fig. 6) over?ow pipes
p of the latter are placed at different heights in
the several vessels so that the developing appa
20 ratus may be immersed to successively greater
depths in the several vessels 0.
What we claim is:
1. An apparatus for developing dental ?lm
in day light which comprises a casing, a chamber
in said casing for a dental ?lm pack encased in
a protective paper strip, a further chamber below
said ?rst chamber and communicating therewith
by a slot for allowing the transport of said ?lms
from said ?rst into said second chamber, said
casing having a slot in a wall thereof leading
from said ?rst chamber for the reception of said
protective strip, means for excluding the entrance
of light through said latter slot, said second
chamber having an opening therein for the ad
35 mission of a treating ?uid and means for pre
venting entrance of light through said opening.
2. An apparatus for developing dental ?lm in
daylight which comprises a casing, a chamber
in said casing for a dental ?lm pack encased in
~40 a protective paper strip, a rear wall in said cham
ber, a front wall hinged to said rear wall allow
ing said chamber to be opened for inserting said
?lm pack, a further chamber below said ?rst
chamber and communicating therewith by a slot
45 for allowing the transport of said ?lms from said
?rst into said second chamber, said casing hav
ing a slot in a wall thereof leading from said
?rst chamber for the reception of said protective
strip, means for excluding the entrance of light
50 through said latter slot, said second chamber
having an opening therein for the admission of
a treating ?uid and means for preventing en
trance of light through said opening.
3. An apparatus for developing dental ?lm in
daylight which comprises a casing, a chamber
in said casing for a dental ?lm pack encased in
a protective paper strip, a rear wall in said cham
her, a front wall hinged to said rear wall allow
ing said chamber to be opened for inserting said
60 ?lm pack, a further chamber below said ?rst
chamber and communicating therewith by a slot
for allowing the transport of said ?lms from said
?rst into said second chamber, said casing hav
ing a slot in a wall thereof leading from said
?rst chamber for the reception of said protective
strip, means for excluding the entrance of light
through said latter slot, said second chamber
having an opening therein for the admission of
a treating ?uid and means for preventing en
trance of light through said opening, a wall in
said second chamber separating said chamber
into two chambers; a ?ap hinged to said wall 10
and means outside said casing for turning said
?ap and. being connected with said casing in
light tight manner.
4. An apparatus for developing dental ?lm in
daylight which comprises a casing, a chamber
in said casing for a dental ?lm pack encased
in a protective paper strip, a rear wall in said
chamber, a front wall hinged to‘ said rear wall
allowing said chamber to be opened for insert~
ing said ?lm pack, a further chamber below said
?rst chamber and communicating therewith by
a slot for allowing the transport of said ?lms
from said ?rst into said second chamber, said
casing having a slot in a wall thereof leading
from said ?rst chamber for the reception of said
protective strip, means for excluding the en
trance of light through said latter slot, said sec
ond chamber having an opening therein for the
admission of a treating ?uid, removably mounted
means for preventing entrance of light through
said opening, a wall in said second chamber sep
arating said second chamber into two chambers;
a ?ap hinged to said wall and means outside said
casing for turning said ?ap and being connected
with said casing in light tight manner.
L: Li
5. An apparatus for developing dental ?lm in
daylight which comprises a casing, a chamber
in said casing for a dental ?lm pack encased
in a protective paper strip, a rear wall in said
chamber, a front wall hinged to said rear wall 40
allowing said chamber to be opened for insert
ing said ?lm pack, a further chamber below said
?rst chamber and communicating therewith by
a slot for allowing the transport of said ?lms
from said ?rst into said second chamber, said 45
casing having a slot in a wall thereof leading
from said ?rst chamber for the reception of said
protective strip, means for excluding the en
trance of light through said latter slot, said sec
ond chamber having an opening therein for the 60
admission of a treating ?uid, removably mounted
means for preventing entrance of light through
said opening, ledges in said second chamber at
a distance from each other smaller than the
width of the ?lm, a wall in said second cham 55
ber separating said chamber into two chambers;
a ?ap hinged to said wall and means outside
said casing for turning said flap and being con
nected with said casing in light tight manner.
JOHN EGGERT.
FRITZ LUFT.
Документ
Категория
Без категории
Просмотров
0
Размер файла
353 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа