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Патент USA US3094048

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June 18, 1963
1-,s.BR1sK1N r-:TAL>
Original Filed March 21, 1955
2 Sheets-Sheet 1
June 18, 1963
' T. s. BRlsKlN ET AL
Original Filed March 21, 1955
2 Sheets-Sheet -2
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United States Patent Oiiticcv
Patented June 18, 1963
ceived within the front housing part 5-3. The optical
system comprises a mirror 72, a lamp 58, condenser
Theodore S. Briskin, Chicago, Robert L. Moore, La
lenses 73 and projection lenses 74, the latter being
mounted in the lens unit 55.
assignors, by mesue assignments, to Revere Camera
Company, a corporation of Delaware
The slide projector includes a motor 90 and an inter
mittently rotating drive shaft 116, which carries a cam
assembly 200. Means are provided for operating the
Original application Mar. 21, 1955, Ser. No. 495,474, now
projector in successive cycles of operation, said means
Grange Highlands, and Rudolph A. Rom, Stickney, Ill.,
Patent No. 2,968,993, dated Jan. 24, 1961. Divided
and this application May 13, 1960, Ser. No. 29,058
2 Claims. (Cl. 38-28)
including a cycling cam '192 and a cooperating follower
10 190. 'I‘he cycling cam 192 forms a part of the cam as
sembly `200, as does a shutter operating cam 203, also
shown in FIG. 2.
As shown in FIG. 1, a shutter assembly 280, also
shown in FIG. 4, is located within and forms a part of
This invention relates to a dual purpose shutter ar
rangement lfor a slide projector, and is a division of our
copending application, Serial No. 495,474 filed March
21, 1955, now Patent No. 2,968,993, granted January 24,
the lens unit 55, the shutter assembly being located be
tween two iof the elements of the projecting lens ’74, and
being secured therein by suitable screws 279. The shutter
It is customary in slide projectors to provide a shutter
assembly includes an actuating sleeve 296 having an
to cut oif the light beam during the slide changing opera
opening of non-circular cross section through which ex
tion. The shutter operation is controlled by the mech
anism of the slide projector, and is generally in the form 20 tends a shaft 303 of similar cross section, the parts be
ing shown as of square cross section, in order to provide
of a wipe blade located substantially in the plane of the
a splined connection between the two.
The lens unit 55 is mounted in a generally tubular
It is an object of the present invention to provide a
member or shell 300, as shown in FIG. l and is remov
slide projector in which the shutter is located in the pro
jecting lens assembly so that it can also be used to regu 25 ably secured therein by a removable set screw, 307. An
edge portion of the shell 300 is provided with rack teeth
late the light intensity. For instance, the usual home slide
301, which mesh with a pinion Á302 which is connected
projector is equipped with a lamp of sufficient wattage
to the focusing knob 6'4. Thus, adjustment of the focus
to project an image on a screen located at a distance of
ing knob shifts the shell 300 and the lens unit 55 back
from 15 to 30 feet. However, sometimes it is desired to
provide a small screen when slides are shown to only 30 and forth.
To accommodate this focusing motion, a sliding con
two or three people under conditions where a full sized “
nection is provided between the actuating sleeve 296 of
screen is not available, as for instance when the slide
>the shutter assembly, and the operating mechanism of
projector is used for a visual aid for a salesman. In such
the projector so that the shutter will be operated during
situations, the light intensity would have to be cut down
very substantially in order to obtain proper color values 35 each cycle of operation. This sliding connection includes the square shaft 303 which is rotatably mounted
in the projected image.
in a plate 304 and projects forwardly therefrom as shown
To accomplish this, it is necessary that a shutter or
in FIG. 1. The plate 304 is located in front of the ver
lens stop be located in the projecting lens.
tical plate `80. Secured to the square shaft 303 and ro
It is another object of our invention to provide an im
proved arrangement by means of which the shutter actu 40 tating therewith is a partial pinion 305, as shown in FIG.
ating mechanism can be located in one part of the slide f" 2, by means of which the square shaft 303- may be ro
tated to open and close the shutter.
projector, and the shutter itself can be slidably mounted
slide which is being projected.
The operating mechanism of the projector includes
in another part of the slide projector, in combination
shutter actuating means which is located in the mech
which is operative irrespective of a change in the relative 45 anism assembly adjacent the cam 203. Thus, the shutter
is normally operated Áby the cycling means heretofore de
positions of the two.
scribed, to cut ofI’ the light beam during the slide chang
Still another object is to provide for a slide projector,
ing operation, that is, during each operating cycle. By
an improved shutter for cutting off the light beam which
using an iris type shutter 280 located in the projecting
provides a fade rather than a wipe.
50 lenses, as contrasted with the usual wipe blade located
A still further object is to provide dual control means u
for a shutter of the type described, one control means` `m in the film plane, two important advantages are ob
tained; first, the light beam is cut oit by a fade rather
serving to actuate the shutter yfor beam cut-olf purposes,
than a wipe, and secondly, the shutter can be used to
and the other serving to actuate the shutter to control
with means for providing a connection between the two
Other objects, features and advantageswill become ap- f p
parent as the description proceeds.
With reference now to the drawings in which like
reference numerals »designate like parts:
regulate »the intensity of the light beam, that is, the light
intensity of the projected picture.
rllo accomplish this latter result, regulation of light in
tensity, manually actuated means, including a shutter
control lever 70, are provided for partially closing the
FIG. l is a longitudinal vertical section through a slide 60 shutter 280 even when in its “open” position. In other
words, the manually actuated means are so related to
the automatically actuated means that the size of the
FIG. 2 is an elevation of the shutter actuating and i
projector embodying our invention;
`«aperture formed by the shutter plates 284 can be con~
trolled without interfering with the automatic shutter
2-2 of FIG. l, certain structural elements `being omitted
for the sake of clarity;
The shutter actuating means includes a rock `shaft 310
FIG. 3 is an enlarged elevation of the rock shaft as
journaled in structural plate members 80 and 83, as shown
sembly taken substantially along line 3--3` of FIG. 2;
in FIGS. 2 and 3. The rock shaft includes an enlarged
control mechanism, being taken substantially along line
hub portion 31]. and a reduced hu'b portion 313.
FIG. 4 is an elevation of the shutter assembly taken
sector 312 is suitably staked to the rear end surface
vsubstantially along line `4-4 -of FIG. l.
the hub portion 311. A ‘double arm follower 314
FIG. 1 shows a slide projector which includes housing
rotatably mounted on the reduced hub portion 313.
parts 50, 52 and 53. A lens unit 55 is telescopically re»
nylon follower disk 315 is mounted between the two arms
the lens unit 55 and this is »done by releasing the set
screw 207 (FIG. 1) and removing the lens unit 55 from
the shell 300.
of follower 314 and is engaged :by the shutter cam 203,
as illustrated in FIG. 2. A pin 317 extends through
the reduced hub portion 313 at a point between the two
To summarize the operation, two separate means are
arms of the follower 314 and is adapted to engage the
provided for operating the shutter, one being the cycling
means, andthe other being the manually operable lever 70.
The arrangement of the cycling means is such that
rivet 316. Thus the pinV ‘and rivet arrangement permits
clockwise movement of the sector 312 with respect to
the follower as viewed in FIG. 2, but it limits or `de
the shutter is in its open position when the cam assem
fines the angular position of the two in the opposite
direction. A relatively strong springA 318 engages the
lbly 200 is at rest, «as determined by the angular posi
parts 312 and 314 'to urge them into their `limiting rela
tion of the cycling cam 192 with respect to the follower
190. This position of the cam assembly and cam 203 is
tive position. The arrangement is such that when the
shown in FIG. 2. Therefore, during each cycle of oper
follower 314 is actuated vby the shutter cam 203, the
ation the shutter will lbe first closed and then opened
so that the light beam will be cut off during the slide
whole assembly will be rocked in the -countercloclkwise
direction as viewed in FIG. 2, since the spring 318 tends
to maintain kthe elements 312 and 314 in the relation
changing operation. ,
The lever 70 is utilized 'to lregulate the beam intensity,
ship shown in FIG. 2. A secondary spring 319 tends
and the construction, which includes a spring biased
to rook the whole assembly in the clockwise direction,
lost motion connection, is such lthat the mechanism ac
so that the follower disk 31S will engage the shutter
tuated lby the lever 70 will not interfere with the cyclical
20 opera-tion of the cam. Thus, ‘by lowering the lever 70,
The sector 312 meshes with a partial pinion 305, as
shown in FIG. 2, t-o rock the square shaft 303 once dur
ing each revolution of the cam assembly 200. The con
cut down the «beam intensity.
nection of the parts is such that -when Ithe follower is
ter through the splined connection 303, 296„which per
the lug 324 will displace the sector 312 to the right to
The dual actuating mechanism is connected to the shut
in its actuated or FIG. 2'position, the shutter Áassem 25 mits the shutter to Ybe located in the slidably mounted
lbly 280 is openïand this position of the parts corre
lens unit 55, in which position the shutter serves as a
sponds to the projecting position of the slide. At other
lens stop to regulate beam intensity.
times, the shutter is closed, so that light will not «be
Although only a preferred embodiment of our inven
projected on the screen when the slide is lbeing ejected
tion is shown and vdescribed herein,` it will =be understood
and :a new slide injected. In other words, the timing 30 that various modifications and changes can lbe made in
of l«the shutter actuating cam "203 is such that the shut
Vthe construction kshown without departing `from the spirit
ter is .closed during practically the whole of the full-cycle
of our invention as pointed out by the appended claims.
of operation; it -is open only during the interval between
successive cycles.
1. Aslide projector comprising a'housing, a lens unit
The arrangement described above inÄconnection with
slida'bly mounted in said housing, a shutter device, an op
FIG. l3 permits the shutter- to «be ypartially closed to regu
erating shaft for -said shut-ter device, mechanism disposed
late light intensity, even whenmthe parts are in the FIG.
Within said housing for operating ¿said projector in suc
2 or actuated position, since it permits cloclcwise move
cessive cycles of operation, said mechanism including fa
ment of the sector 312 beyond the position'shown.
cam assembly, said cam assembly'inclu-ding a shutter-cam
The partial closing of the shutter is effected by the 40 vanda cycling cam, and means for rotating 'said cam as
„manual actuating means referred to above, »which in
sembly, means providing a mechanical connection be
cludes the shutter control lever 70 which is pivotally
tween said sliutter cam andsaid operating sha-ftwhereby
mounted on the plate 304 by lthe pivot rivet 321, shown
said _shutter device will be operated once during each
in FIG. 2. The plate 304 is provided-with an arcuate 45 cycle >of operation, means controlled by said cycling cam
slot 322, land the Vshutter control lever 70 carries a
for terminating the cycle of operation while said shutter
flanged rivet 323 which extends rearwardly into the slot
is >in open position,'said shutter device being mounted
and engages the edges thereof to provide a Ifrictional er1
gagement. Thus, the lever 70 may be maintained in any
within'said lens lunit so that it -forms a par-t thereof
and is movable therewith in said housing, said shutter
vdesired position, `against the Ibias of the relatively strong 50 device including -a sleeve having a noncircular opening
spring 318, as will be pointed out.
for slidably receiving said operating shaft, said operating
The shutter control lever 70 is provided with a down
shaft having a noncircular cross section which is received
wardly projecting lng 324 which engages the sector 312
within said sleeve so that a driving connection may be
to rotate the latter in the clockwise direction, as viewed
provided between said operating shaft and said shutter
in FIG. 2, and as above described, »against the bias of 55 Vdevicevvithout impairing the slidalble movement of said
spring 3‘1'8. Thus, Ithe square shaft 303 may tbe main
lens unit, and additional ymeans movable into engagement
tained in `a position corresponding -to a partial closing of
with said mechanical connection providing means for op
the shutter without in any manner interfering with the
erating said shutter from its open position into a partially
rocking motion imparted to the square shaft 303 by the
closed position.
shutter cam 203.
When the shutter is in its closed position, the sector
312 will be to the light of its FIG. 2 position, and clear
of the lug 324. Since the square shaft 303 and the
2. A slide projector as claimed in claim 1 in which said
additional means is manually operable, and means for
maintaining saidadditional means in an adjusted position
whereby said additional means can serve as a manually
rock shaft assembly 3‘10, 312, 314, are biased into the
operable means to regulate the intensity of a light beam
shutter closed position by the spring 319 and since the 65 passing through said lens unit.
shutter blades themselves are biased into closed position,
References Cited in the ñle of this patent
the square shaft 303 and the sleeve 296, when the shutter
is closed, will always be in the identical angular align
ment. Thus, it is possible to remove the lens unit 55 and `
replace it, providing the shutter is closed, without spe 70
cially manipulating the respective parts to provide 'the
proper angular alignment. As an example, there may »
'be situations in which it may be desired to substittue
Patterson _____________ __ May 19,
Partington ____________ __ Feb. 22,
Ashley _______________ __ Aug. 19,
Wengel _______________ __ Oct. 13,
Tuck ________________ __ Dec. 18, 1951
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