Патент USA US2132716код для вставки
Oct. 11, 193s.v Q. wmEL ' 2,132,716" SLIDE CHANGING DEVICE FOR A PROJECTOR Filed March 20, 1937 FIG..1. ‘ ‘ “39 “37a 24 5 . 2 16 INVENTOR. . wk?” Patented Oct. 11, 1938 g . . _ ' 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 - 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. ' Fig. 5 is a fragmentary rear elevation of the Such v 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. ' 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. _ - 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.‘ ' ' O'I'I'O WI'I'I'EL.