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Патент USA US2113580

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April 12, 1938.
R H, DRAEGQ
2,113,580
ADJUSTABLE FILM GATE
Filed April 6, 1937
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INVEN TOR.
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A TTORNEYS.
‘April 12, 1938.
R. H. DRAEGER
2,1 13,580
ADJUSTABLE FILM GATE
Filed April 6, 1937
2 Sheets-Sheet 2
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Patented " Apr. 12, 1938
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2,113,580
UNITED STATES PATENT OFFICE
2,113,580
ADIU STABLE FILM GATE
Rupert H. Draeger, United States Navy
Application April 6, 1937, Serial No. 135,266
4Claims. (Cl. 95-65)
(Granted under the act of March 3, 1883, as
amended April 30, 1928: 370 O. G. 75'!)
This invention relates to adjustable ?lm gates
for use in copying cameras, projectors, enlargers
or the like and more particularly to the type of
?lm gate illustrated and described in my Patent
5 No. 2,073,627 of March 16, 1937.
In cameras of this type or the like it is both
desirable and economical that only that length of
?lm be exposed which is equal to the length of
the image of the object being copied. when
larger or smaller objects are copied it is also
desirable to be able to use more than one width
of ?lm in order to effect further economies.
The object of this invention is to provide an
adjustable ?lm gate having readily replaceable
15 ?lm gate pieces to serve for the use of more than
one width of ?lm.
,
Other objects ofthls invention will be apparent
from these speci?cations and the accompanying
drawings forming a part thereof and the scope is
20 to be limited only by the claims appended hereto.
In the drawings:
'
Fig. 1 is a side elevation of a camera partially
broken away to show the ?lm gate.
Fig. 2 is a plan view of the ?lm gate partially
broken away to show the gate pieces.
25
Fig. 3 is an exploded view of the ?lm gate
mechanism showing the relation between the
various parts.
Figs. 4a and 4b are plan views of two sizes of
interchangeable ?lm gate pieces, and
Fig. 5 is a sectional view on lines 5-5 of Fig. 2.
In the. accompanying drawings Fig. 1 shows
one form of camera constructed in accordance
with the present invention. In the camera case
35 llisshownabase il havingareoess?inwhich
the two gate carrier
slideably supported
tained by two guides
tached to the base H
members I! and II are
These members are re
l5 and it which are at
by screws 11.
The pins l3 and 23 attached to gate carrier
_ members I! and I3 extend into the slotted ends
of toggle II, which is rotatably mounted on pin
2! attached to frame II.
The gate carrier member I: is provided with
45 rack 2| which engages spur gear 22 mounted on
control shaft 23.
, The gate pieces 24 and 25, having apertures ll
oiasiaeappropriatetothewidth?lmtobeused,
di?erent sized apertures being provided for dif
60 ierent widths of ?lm as shown at 3! and 33, are
mutually interlocking as disclosed in my above
mentioned Patent 2,073,827. These gate pieces
are ?tted with locating holes 26 which ?t over
pins 21 and are slidabiy held in. place by guides
55 II and It.
.
The gate pieces 23 and 2! are further ?tted
with grooves 23 to receive the balls ll protrud
ing from lmies II in the guides. These balls 3.
holes 3| by lips 34. The ?lm gate pieces 24 and
25 are recessed to receive the different width
?lms 35 and 36.
'
The ?lm gate cover 31 and pressure plate 33
are rotatably attached to the arms 40 of base II
by pins 33.
In operation, when it is desired to change the
length of the ?lm exposed in the ?lm gate, the
lengthof the aperture 4| may be increased or
decreased by the proper manipulation of the 10
control rod 23. When it is desired to use an
other width of ?lm the cover 38 may be raised
and the ?lm gate pieces 24 and 25 replaced by
?lm gate pieces of a di?erent aperture width to
accommodate the diiIerent width of ?lm.
The invention described herein may be manu
factured and used by or for the Government of
the United States of America for governmental
purposes without the payment of any royalties
thereon or therefor.
What I claim is:
‘
l. A ?lm gate having means for permitting the
exposure of different lengths of more than one
width of ?lm, said ?lm gate consisting of two
removable ?lm gate pieces providing the com 25
plete ?lm gate aperture and means for guiding
?lm through said ?lm gate parallel to the cen
ter line of the length of the aperture in said
gate.
- i_
2. A ?lm gate comprising in combination a 30
plurality of removable ?lm gate pieces providing
the complete ?lm gate aperture, and means for
actuating said ?lm gate pieces, said means be
ing removably associated with said ?lm gate
pieces to permit the interchanging .of said ?lm
gate pieces with other ?lm gate pieces having
different width apertures for accommodating
more than one width of ?lm.
3. A ?lm gate comprising means for exposing
di?erent lengths of ?lm, said means including 40
removable ?lm gate pieces, carrier means adapt
ed for holding ?lm gate pieces for accommodat
ing di?eient widths of ?lm. said ?lm gate pieces
being in the same plane in cooperative light
tight slideable engagement with each other, 45
means for removably attaching said ?lm gate
pieces to said carrier means, toggle means for
causing the movement of one gate piece to par
take or the linear movement of the other in an
opposite direction and means for adjusting said
carrier means by a rack and pinion connected
therewith.
4. A ?lm gate having meanscomprising inter
changeable substantialiy L-shaped pieces for per
mitting the exposure of di?erent lengths of ?lm; 55
and means for detachably mounting said pieces
and for permitting relative motion thereof,
whereby varying lengths of a plurality of widths
arethrustintogroovesllbysprings?retained - oi?lmmaybemaskedbysaidgate.
RUPERT H. DRAIGIR.
so bypius??andarepreventediromeseapingirom
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