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Патент USA US2132716

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Oct. 11, 193s.v
Q. wmEL
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2,132,716"
SLIDE CHANGING DEVICE FOR A PROJECTOR
Filed March 20, 1937
FIG..1. ‘
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“37a
24
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2 16
INVENTOR.
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Patented Oct. 11, 1938
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2,132,716 .'
~ UNI-TED STATES PATENT OFFICE
SLIDE CHANGING DEVICE FOR A
PROJECTOR
Qtto Wittel, Rochester, N. Y., assignor to East
man Kodak Company, Rochester, N. Y., a cor
poration of New Jersey
>
Application March 20, 1937, Serial No. 132,107
7 Claims.
(Cl. 88-28)
The present invention relates to a slide changing device for a projector in which the projec-v
tion beam is doused simultaneously with release
of the slides for changing.
It is well understood that a more pleasing effect
~ is obtained in the projection of still pictures if
jector may comprise a base It! into which one
or more leveling screws II are threaded. A
lamphouse l2 of conventional design and enclos
ing a light source, not shown, is mounted upon
the base Ill.
An intermediate mounting frame I3 is fastened
the projection beam is intercepted or doused for
the change of slides. It is also known that trans-
to the base It] and to the lamphouse |2 by a
thumbscrew l4 which passes through the open
parent slides may be‘ held in a guideway of a
10 projector by holding means that can be released
at will for changing the slides.
'
l6 and is provided with an opening H.
The primary object of the present invention
is the provision of a projector for transparent
slides in which the holding means for the slides
15 at the projection opening is released by move.ment of the shutter for intercepting the projection beam into closed position.
‘
Another object of the invention is the provision of spring members for holding a transpara 20 out slide at a projection opening in a guideway
and of projections on a pivotally mounted shutter. which projections engage the spring members for release of the transparent slides when
the shutter is moved to intercept the projection
25 beam.
ing IS in the top of mounting frame IS. The
intermediate mounting frame l3 has a shoulder 10
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A guideway I8 is vertically arranged upon the
projector and includesa back plate I 9 which is
fastened to intermediate mounting frame l3 by
bolts 20, see Fig. 5, and which is provided with 15
a projection opening 2|. Said guideway l8 has
a channel cross-section and comprises side walls
22 and overhanging front edges 23. An abut
ment.“ is provided at the lower end of guideway
l8 upon the shoulder l6 and includes a ?ange 25. 20
A shutter housing 2Q is fastened to interme
diate mounting frame l3 by screws 21 and is
recessed at one end to ?t over the guideway HIV
and at the other end is provided‘ with a threaded
. opening 28 for the objective 29.
Other and further objects of the invention will
A square shaft 25
30 is journaled in the sides of shutter housing
be evident to those skilled in the art from the
26 and carries a shutter member 3|.‘ An oper—
following description. .
ating arm 32 is connected to one end of shaft
The above and other objects of the invention
30 are embodied ina projector for transparent slides
which'is provided with a guideway for the slides,
one or more holding members for maintaining a
slide at the projection opening of said guideway,
a pivotally mounted shutter, and dis-engaging
5 means operative, upon movement of said shutter
30 and is at one side of shutter housing 26. R0
tation of said operating ' arm. 32 rotates said 30
shutter member 3| to cover projection opening
2| in guideway l8 and to intercept the projec
tion beam of the projector_
A holding means is associated with the guide
way l8 for engaging and maintaining a trans- 35
to closed position, to release said holding means
parent slide at the projection opening 2|.
which is maintaining a‘ slide at the projection
a holding means may comprise a pair of spring
opening.
members 33 which are fastened within inter
‘
Reference is hereby made to the accompanying
40 drawing wherein similar reference characters
designate similar elements and wherein:
_
Fig. 1 is a side elevation of a projector equipped
with the novel features of the invention.
Fig. 2 is a vertical cross-section through the
45 projection head of the projector..
Fig. 3 is also a vertical cross-section through
the projection head showing the holding means
in released position when the shutter is in closed
mediate mounting frame l3 by rivets 34 and
which include curved portions 35 extending 40
through the opening H in intermediate mount
ing frame l3 and extending through apertures
36 in the back plate IQ of guideway I8.
The transparent slides 31 may be of any known
form, such as lantern slides, or ?lms mounted 45
between transparent sheet members and are
adapted to be introduced at the top of guideway
l8 and fall by gravity through the guideway.
According to the arrangement shown, which in
no way restricts “the application of the invention, 50
the ?rst slide 31a, see Fig. 3, falls onto the abut- '
ment 24 of guideway l8 so that the second slide
gate structure for the projector.
31b rests upon slide 31a and. is framed at the
, The invention is particularly applicable to a projection opening 2|. Obviously, abutment 24
55 projector for ‘transparent slides. Such a pro-‘ is so spaced from said projection opening 2| 55
50
position.
‘
Fig. 4 is a horizontal cross-section taken on
the line 4-4 of Fig. 3.
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Fig. 5 is a fragmentary rear elevation of the
Such
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2,182,718
that the lower slide will cause proper framing
of the superjacent slide 31b. The slide 311) is
engaged and maintained at the projection open
ing 2| by the holding means, such as by the
curved portions 35 extending into guideway l8
and engaging the edges of slide 31b.
Thetr-ansparent slide 31 may be so thin that
if it is riotguided through guideway‘ l3 the super- ‘
jacent slide may not abut the lower slide and
To ob
10 may fall directly through the guideway. may.
be
, viate this di?iculty the holding means
‘.
member 3|, however, it is clear that only’ one
spring member 33 may be su?lcient or that the
shutter may be arranged on the same side of the
guideway as the spring members. Other modi?
cations of the invention may be obvious to those
skilled in the art and are deemed to be within the
scope of the invention as de?ned by the appended
claims.
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Having now particularly described my inven
tion what I’ desire to secure by Letters Patent of 10
the United States and what I claim is:
b
1. In a projection apparatus, the combination
supplemented by the provision of a curved spring ' with a stationary guideway for transparent slides
member 33, see Figs. 3 and 4. Said curved spring ' and provided with a projection opening, and hold
member 38 may have one, end folded over the ing means movable into said guideway for en 15
end of back plate IS, the other end folded gaging and maintaining a slide at said projec- 15 upper
through an opening 33, see Fig. 3, in back plate
tion opening, of a shutter member movably
[3 and is intermediately convexly bowed toward ' mounted with respect to said projection opening
the overhanging front edges 23 of guideway l3.
Curved spring member 33 is also provided with
20 an ‘opening 43 in registry‘ with the projection
opening 2| of guideway l3. The engagement of
the slides 31 by spring member 33 is su?icient to
lightly urge the slides against the overhanging
front edges 23 but is not suf?cient to prevent the
25 falling of the slides through guideway |3 under
the action of gravity. Spring member 38 merely
insures that all of the slides will rest against said
overhanging edges 23 so that the superjacent
slide 31b will always abut the lower slide 31a and
'30
and movable to a closed position for intercept
ing a projection beam through said opening, and 20
disengaging means movable with said shutter
member and for operating said holding means to
disengage the slide at said projection opening
upon movement of said shutter to closed position.
2. 'In a projection apparatus, the combination
with a vertical and stationary guideway for trans
parent slides and provided with a projection
opening, and holding means extending into said
guideway‘and for engaging and maintaining a
slide at said projection opening, of a shutter
member movably mounted with respect to said
In the modi?cation shown in Fig. 3, the curved I projection opening and movable to a closed posi
portions 35 of spring members 33 bear against‘ tion for intercepting a projection beam through
the side margins of curved spring member 38, said opening, and disengaging means movable
see Fig. 4. Consequently, the slides may be held with said shutter member and for operating said 35
in position either by direct engagement of curved holding means to disengage the slide at said pro
portions 35 therewith or by said curved portions jection opening upon movement of said shutter
pressing against the spring-member 38 which in member to closed position.
turn engages with the slides and maintains them
3. In a projection apparatus, the. combination
at the projection opening 2|.
.
with a vertical guideway for transparent slides,
The outstanding featin'e of the’ present inven
provided with a projection opening, and includ
tion is a co-operation between the shutter mem
ing an abutment at the bottom of said guideway
ber and the holding means so that as the pro
to support a slide and spaced from said opening
be properly framed.
‘
jection beam is intercepted or doused the hold
ing means is disengaged from the slide at the
so as to frame a superjacent slide therein, and
holding means having a part within said guideway 45
projection opening. Such co-operation may be and for frictionally engaging and maintaining a
effected by the provision of disengaging means slide in frame at said projection opening against
movable with the shutter member and for oper
the action of gravity, of a shutter member mov
ating the holding means. In the speci?c ‘illus- ‘ ably mounted with respect to said projection
trated embodiment the disengaging means are opening and movable to a .closed position for
provided in the form of projections 4| which are intercepting a projection beam through said
mounted upon the side edges of shutter member opening,‘ and “disengaging means movable with
3| or formed integral therewith. Spring mem
said shutter member and for operating said hold
bers 33 are provided at a slight angle so that
means to disengage the slide at said projec-,
the extreme free ends 42 thereof overhang the ing
tion opening upon movement of said shutter 55
side walls 22 of guideway I8 and so that projec
member to closed position.
tions 4| may pass guideway I8 at each side there
4. In a projection apparatus, the combination
of and strike the ends 42 of spring members 33. with a vertical channeled guideway with over- ‘
Projections 4| are of such length that when hanging edges, provided with a projection open
shutter member 3| has been moved to closed
00'
position, as shown in Fig. 3, said projections ll ing, and including an abutment at the bottom of
said
guideway
for
supporting
a
slide
and
spaced
have moved the spring members 33 to release
from said opening so as to frame a superjacent
the slide at the projection opening. In this man
ner the slide at the projection opening does not slide therein, a curved spring member within said
‘guideway and provided with an opening in reg
move until the projection beam has been inter
cepted and the undesirable eifect of a moving istry with said projection opening and for lightly
urging said slide against the edges of said guide
illuminated slide is eliminated.
The shutter member 3| and operating arm 32 way, and a holding member extending into said
are balanced so that they assume a normal posi
tion, as shown in Figs. 1 and 2. In order to elimi
70 nate the noise when the shutter member 3|
returns to its open position, a rubber bumper 43
guideway and pressing said spring member
against a slide to hold the same at said projection 70
opening, of a shutter member movably mounted
with respect to said projection opening and mov
is provided within shutter housing 26.
able to a closed position for intercepting a pro
The holding means is illustrated and described
as comprising two spring members 33 on the op
jection beam through said opening, and a disen
gaging member movable with said shutter mem
posite side of the guideway l8 from the shutter
76
2,182,716
her and for operating said holding means so that
the holding pressure on said spring member is re
leased when said shutter member is moved to
closed position.
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5. In a projection apparatus, the combination
, with a support having a.projection opening, a
guideway for slides also provided with a projec- ‘
tion opening, and provided with a hole adjacent
said opening, and a‘ spring gnember mounted
10 upon said support and including a curved portion
extending through the hole in said guideway and
for maintaining a slide at said projection open
ing, of a shutter member movably mounted with
respect to said projection opening and movable
15 to a closed position for intercepting a projection
beam through said opening, and disengaging
means movablewith said shutter member and for
operating said spring member to, disengage the
slide at said projection opening upon movement
20 of said shutter member to closed position.
6. In a projection apparatus, the combination
‘with a. support provided with a projection open
ing, a guideway for lantern slides and provided
with a projection opening, and holding means‘
upon said support on one side of said guideway,
3
ing means is moved and the ?rst portion thereof
releases the slide at said projection opening.
7. In a projection apparatus, the combination
with a support provided with a projection open
ing, a vertical channeled guideway with over
hanging edges, provided with a projection open
ing and with a hole on each side thereof, and
including an abutment at ‘the bottom of said
guideway for supporting a slide and spaced from
the opening in said guideway so as to' frame a 10
superjacent slide in said opening, a. curved plate
spring member within said guideway and pro
vided with an opening in registry with said pro
jection opening and for lightly urging the slide
against the' overhanging edges of said guideway, 15
and a pair of spring members on said support
at each side of the opening therein, each having
an intermediate curved portion extending into
each hole in said guideway normally to press
against said plate spring and hold a slide at said 20
projection opening, and each having an end por
tion extending ‘beyond each edge of said guide
way, of a shutter housing attached to said sup
port, a shutter mounted within said housing for
rotation about an axis transverse to said guide 25
way, and a projection on each edge of said shut
having a portion extending into said guideway for
maintaining a slide at said projection opening, ter, located and proportioned to engage the end
and having a second portion extending beyond portions of said spring member when said shut- '
the edge of said guideway, of a shutter rotatably ter is moved to cover the projection opening in
30
mounted at the other side or said guideway and said guideway and to move said‘ intermediate
movable to a closed position for intercepting a curved portion away from said plate spring mem
projection beam, and a projection on said shutter ber so that the slide at the projection opening
so located that upon movement of said shutter
to closed position, the second portion of said hold
may drop onto said abutment.‘
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O'I'I'O WI'I'I'EL.
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