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Publication numberUS2718171 A
Publication typeGrant
Publication dateSep 20, 1955
Filing dateAug 9, 1951
Priority dateAug 9, 1951
Publication numberUS 2718171 A, US 2718171A, US-A-2718171, US2718171 A, US2718171A
InventorsHarold G Fitzgerald
Original AssigneeHarold G Fitzgerald
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Image projecting apparatus
US 2718171 A
Abstract  available in
Images(3)
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Claims  available in
Description  (OCR text may contain errors)

Sept. 20, 1955 H, G. FlTZ GERALD V IMAGE PROJECTING APPARATUS 3 Sheets-Sheet 3 Filed Aug. 9. 1951 United States Patent Oflice IMAGE PROJECTIN G APPARATUS Harold G. FitzGerald, Los Angeles, Calif.

Application August 9, 1951, Serial No. 241,020

6 Claims. (Cl. 88-24) The invention has to do with image projecting apparatus and it is a general object of the invention to provide a simple, practical, improved structure by which light is generated and projected through a horizontally disposed image bearing element to a vertically disposed screen, or the like, located at a suitable distance from the structure.

Light or image projecting devices of the general character above referred to have long been used and they are, in most cases, more or less heavy and cumbersome and are such as to occupy a considerable space when not in use or as they are being transported from one place to another. This type of apparatus is highly practical and desirable in educational institutions, in halls, auditoriums, and other like places, and therefore it is generally necessary to move them at rather frequent intervals from one place to another, and it is desirable when they are not in use that they be stored or transported.

It is a general object of this invention to provide a device of the general character referred to which, when not in use can be established in a simple, small, compact assembly which is such that it can be easily handled and stored. The'structure of the present invention, when conditioned for storage or transportation, is in the form of a simple box of limited size, and free of undesirable projections or other features.

It is another object of this invention to provide a,

device of the general character referred to which is simple, easy and convenient to set up or establish ready for use, or to condition for transportation or storage.

A further object of the invention is to provide a structure of the general character referred to which involves few simple, easily operated parts that form a structure that is easily operated and which can be rapidly manipulated or handled for conversion between a working condition and a collapsed condition where it is suitable for storage or handling.

A further object of the present invention is to provide a structure of the general character referred to that is free of delicate or complicated devices, elements, or features of construction.

It is a further object of the invention to provide a device of the general character referred to which is highly eflicient and practical in the handling of light and heat that results from the generation of the necessary light.

The structure of the present invention includes a case or box-like structure establishing three compartments, an upper storage compartment, a lower van compartment, and an intermediate lamp compartment. Illuminating means is carried in the lamp compartment and involves a reflector and a lamp carrying socket. Heat shields are also provided in the lamp compartment and check the passage of heat from the lamp to walls of the case thatmight otherwise become undesirably hot. Air circulating means is provided in the fan compartment and involves a fan operated by a motor so that the fan draws air into the fan compartment and circulates it upwardly through the lamp compartment and into the storage compartment, from which it is finally discharged. A power line enters the case through an opening provided in the back of the storage compartment and supplies energy to the motor and to the lamp. A work rest or platform is carried by the case at the front thereof and is movable between a collapsed or folded position where it is vertical and against the front of the case, and an out or working position where it is horizontal and projects forward from the case. A light handling means receives light from the lamp and reflector and delivers it vertically through the panel portion of the work rest. This means preferably includes a light duct at the front of the case involving a forward wall that is inclined so that it extends up and forward, and side walls that are triangular and vertically disposed, and which extend between the side edges of the forward wall and the front of the case. The light duct is collapsible or foldable, the forward wall being hinged to the case to fold against the case and the triangular side walls being hinged to the side edges of the forward wall so that they can be folded together and against the forward wall. A reflector is provided on the upper or inner side of the forward wall and receives light from a projecting lens at the lamp compartment of the case. The light thus received is reflected and directed vertically through the panel of the work rest. A supporting means is provided for the work rest and light duct and preferably involves a base joined to the case and projecting forward therefrom, and a brace that extends up from the base and engages the structure formed by the light duct and work rest. The supporting means is preferably collapsible, that is, it is preferred that the brace be hinged to the base and that the base be hinged to the case. Furthermore, the base is shaped and proportioned to form a cover occurring at the front of the case to cover or enclose the light duct and work rest when these elements are collapsed and the base is collapsed over them. A light projector is provided above the work rest and is carried by a mounting means. The light projector involves a projecting lens and a reflector carried in a housing and the mounting means involves a post telescopically engaged with the case and provided with a head that carries the housing. The head is de tachable from the post and pivoted to the housing. When the structure is collapsed the post is within the case and the head is folded to a position adjacent or against the. housing and this assembly is arranged in the storage compartment of the case.

I The various objects and features of my invention will be fully understood from the following detailed description of a typical preferred form and application of the invention, throughout which description reference is made to the accompanying drawings, in which:

Fig. 1 is a side elevation of the structure provided by the present invention, showing it in the folded or collapsed condition, in which state it can be stored or easily handled, for instance, transported from one location to another. Fig. 2 is an enlarged side elevation of the structure showing it in open or working condition, certain parts being shown in section to illustrate details of construction. Fig. 3 is a sectional view of a part of the structure shown at the bottom of Fig. 2, showing the parts in folded condition instead of working condition. Fig. 4 is a view showing a portion of the structure illustrated in Fig. 1 with one part partially unfolded or open and illustrating the folded position of other parts. Fig. 5 is a plan view of the structure shown in Fig. 2. Fig. 6 is an enlarged Patenteol Sept. 2-0, 1955.

sectional view of a portion of the structure shown in Fig. 2. Fig. 7 is a detailed sectional view taken as indicated by line 7-7 on Fig. 6. Fig. 8 is a detailed sectional view of a portion of the structure taken in the direction indicated by line 15-15 on Fig. 6, showing the parts in folded or collapsed condition. Fig. 9 is a plan section taken as indicated by line 9-9 on Fig. 6. Fig. 10 is a plan section taken as indicated by line 10-10 on Fig. 6. Fig. 11 is a view taken as indicated by line 11-11 on Fig. 6. Fig. 12 is a view of the upper end portion of the brace employed in the structure. Fig. 13 is a vertical sectional view taken at the upper portion of the case showing the mounting of the post in the case. Fig. 14 is a view taken as indicated by line 14-14 on Fig. 13. Fig. 15 is a sectional view taken as indicated by line 15-15 on Fig. 6, illustrating the parts positioned as they occur in Fig. 6 and which are shown collapsed in Fig. 8. Fig. 16 is a sectional view taken as indicated by line 1616 on Fig. 6. Fig. 17 is a sectional view taken as indicated by line 17-17 on Fig. 11, and Fig. 18 is an enlarged sectional view taken as indicated by line 1818 on Fig. 16.

The structure of the present invention involves, generally, a case A, illuminating means B in the case, air circulating means C in the case, a power line D supplying energy to the means B and C, a Work rest or platform D, light handling means E, support means F for the rest D and the duct of means E, a light projector G, mounting means H for the projector G, and various other elements and features of construction as will be hereinafter set out.

The case A, which is, in effect, the body of the structure, is preferably a simple, box-like element or structure having a vertically disposed back wall 10, a vertically disposed front wall 11, vertically disposed side walls 12, a horizontally disposed top wall 13, a horizontally disposed bottom wall 14 and upper and lower horizontal partitions 15 and 16. The back wall, front wall, and side walls of the case are preferably of about equal width and their vertical edges are joined so that these elements establish a vertically disposed structure which is substantially rectangular, preferably about square in plan configuration.

The partitions 15 and 16 are located in the case and are vertically spaced so that they divide the interior of the case into three compartments, an upper storage compartment 20, a lower fan compartment 21, and an intermediate or middle lamp compartment 22.

The upper portions of the parts forming the case, particularly the upper portions of the side 12 and front wall 11, are plain and impervious, as is the top wall 13, so that these elements form a compartment 20 which is completely enclosed and which opens at the back of the case. In the particular case illustrated the back wall 10 terminates at partition 15 or where compartment 20 starts, and consequently the back of compartment 20 is completely open and unobstructed. A closure is provided for the back or open side of compartment 20 and it is preferably a hinged closure. Closure 20 is shown as a flat plate connected to the case where the back 10 joins the upper partition 15 and the connection is by means of a hinge 26. The closure 25 is such that when it is in an up or closed position it completely covers the opening at the back of compartment 20 and a suitable releasable latch device 27 is provided to retain the closure in the closed or up position. When the structure is opened out or in use the closure 25 is preferably open and depends so that it is immediately adjacent the back 10 below partition 15, as clearly shown in Fig. 6 of the drawings.

The middle or intermediate portions of the side walls 12, the back 10 and the front wall 11 occurring at the lamp compartment 22 are preferably plain, vertically disposed, imperforate parts establishing a lamp compartment which is without lateral or side openings, except for a single light-passing opening 30 that occurs in the front wall 11. The upper partition 15 that separates compartments 20 and 22 is preferably a simple, flat, horizontally disposed plate having a plurality of openings or apertures 31 therein, so that there is free circulation of air from the lamp compartment 22 to the storage compartment 20, and the lower partition 16 is provided with a plurality of openings or apertures 32 providing free circulation of air from the fan compartment 21 into the lamp compartment 22.

The lower portions of the side walls 12 and back wall 10 are preferably provided with suitable openings, for instance, louver openings 34, so that air can freely enter compartment 21 from the back and from the sides of the case. The bottom 14 of the case is provided with a plurality of apertures or openings 35 admitting free flow of air into compartment 21 from the bottom of the case.

In accordance with the preferred construction suitable supports or feet 36 are provided on the case at the lower end or bottom thereof to normally engage a support 37 in a manner to hold the case slightly above the support so that air can freely enter beneath the bottom 14 in order to flow into compartment 21.

In the preferred form of the invention the several parts or elements of the case A, as hereinabove described, are formed of sheet metal or the like, and various parts are suitably secured together or rigidly connected, as by welding, flange connections, or other suitable means, so that the case is a rigid, unitary structure, all with the exception of the upper partition 15 which is preferably separate from the other parts of the case and such that it can be removed from the position shown in Fig. 6 when desired, in order to make possible access to the lamp compartment 22 through the open back of the storage compartment 20. In practice the upper partition 15 is normally supported in operating position on rests 40 occurring in the case.

The illuminating means B involves, generally, a lamp carrying socket 41 and a reflector 42. In the preferred construction the socket 41 is mounted on or carried by the lower partition 16 of the case A so that the lamp 43 in the socket is located in the lamp compartment 22 in horizontal alignment with the light opening 30 in the front wall 11 of the case. The reflector is located behind the lamp 43 or between the lamp 43 and the back 10 of the case.

In the preferred form of the invention heat shields 44 are provided in the lamp compartment 22-between the lamp 43 and the sides 12 of the case. The shields illustrated in the drawings are vertically disposed sheet metal elements carried by the partition 16 to project upwardly therefrom and to a point immediately beneath partition 15. The shields are shown as corrugated and they are so disposed as to check heat from lamp 43 that might otherwise reach the walls 15 at the compartment 22 with consequent objectionable heating thereof. With the arrangement illustrated air circulated by the means C passes up through the fan compartment 21 at both sides of the shields 44 and as a result the heat is effectively carried away so that there is no undesirable overheating of parts.

The air circulating means C is located in the fan compartment 21 and preferably involves a suitable fan operated by a motor 51. In the preferred arrangement the motor 51 is mounted on or carried by the bottom 14 and is arranged so that its shaft 52 is vertically disposed and carries and operates the fan 50 so that air is effectively drawn into the compartment 21 and is circulated therefrom up through compartment 22 to finally discharge from the case through compartment 20.

The power line D is preferably in the nature of a flexible electric cable suitably connected with the socket 41 and the motor 51 through a suitable switch S operable from the exterior of the case. The cable is of substantial length so that a fitting 56 on its outer or free end can be applied to a socket or the like. When the structure is collapsed or in the folded condition the cable D is carried in the storage compartment 20 and when the structure is open or in use the cable issues from the case through the open back of the compartment 20.

The work rest or platform D is carried by the case A at the front thereof and is movable between a collapsed or folded position where it is vertical and adjacent the front of the case and an out or working position where it is horizontally disposed and projects forward from the front 11 of the case. In the preferred construction the work rest is pivoted to the case and, as shown in the drawings, it may be connected to the front 11 of the case by a suitable hinge 56.

The work rest or platform may be varied widely in form and construction, depending upon the character of service to be performed thereby. In a typical case such as is illustrated in the drawings the rest D involves a rectangular frame 57 which carries a panel 58. The frame is shown as a metal frame rectangular in form and the panel 58 is shown as a laminated element, and in practice it is formed of glass or the like, or a combination of materials forming a rigid flat translucent element. The panel may be such that it can be marked upon or it may serve merely as a support or rest for image bearing elements such as films or transparencies.

In the case illustrated the rest D is provided with an extension 60 adapted to project from or extend beyond I the outer edge of the frame 57. The extension is shown as detachable from the frame and it has a depending flange 61 releasably carried by a holder 62 on the outer edge of frame 57.

The light handling means E is characterized by a condenser lens 64 located to receive light from the lamp 43 and reflector 42 and is such as to direct a shaft or beam of light horizontally and forward, through opening 30 in the front 11 of the case A. In the construction illustrated a tubular mounting 65 suitably supports the condenser lens 64 in the compartment 22 forward or in front of the lamp 43.

The means E includes a light duct forward of the front 11 of the case and which is such as to handle light passed through the opening 30 from the lamp 43 so that such light is directed vertically through the panel 58 of the rest D. In the construction illustrated the light duct includes a forward wall 70 which is flat, rectangular in form, and disposed so that it is inclined and it projects up and forward from the front wall 11 of the case from L a point below the opening 30, so that it is in the path of light issuing horizontally through opening 30. The duct further includes side walls 71 triangular in form and having inclined edges joined to the side edges of the forward wall 70, horizontal edges that join or abut the rest D and vertical edges that adjoin or abut the front 11 of the case A.

In the preferred form of the invention the forward wall 70 of the light duct is a rectangular, imperforate plate or panel and it is so connected to the case A as to facilitate folding of the structure from a position such as is shown in Fig. 6 to one such as is illustrated in Fig. 4. In the particular case illustrated the lower edge of the forward wall 70 is pivoted to the case, for instance, it is joined thereto by a suitable hinge 72, which hinge is secured to the front 11 of the case at a point suitably spaced below the opening 30.

The side walls of the light duct are substantially rectangular as will be apparent from Fig. 6 of the drawings, and their inclined or angular edges are preferably pivotally connected to the side edges of the wall 70, as by hinges 76. With the construction just described and which is illustrated in Figs. 8 and 15, the side walls 70 are freely operable between vertical working positions such as are shown in Fig. and folded or collapsed positions where they overlie each other and are adjacent the wall 70, as shown in Fig. 8. It is to be observed that the walls 71 fold against or over the outer side of wall 70 and not over the inner side thereof. The light handling means D includes a reflector, preferably a suitable flat light reflecting elment 80, and this is located on the inner side of the Wall 70 where it is held by a suitable mounting means 81. The reflector is flat and in a plane parallel with that of the wall 70, and it is angularly related so that the horizontal light passing through opening 30 hits the reflector and is directed vertically thereby and through the panel 58. j

The supporting means F is provided to releasably hold or support the wall 70 in the desired angular position and the rest D in the horizontal position. In the form of the invention illustrated the supporting means F involves a base 82 and a brace 83. The base, when in working position, projects horizontally forward from the front of the case and it is preferably provided at its outer or extreme end portion with a foot 83 adapted to rest upon the support 37, as shown in Fig. 2 of the drawings. In the -'preferred construction the base 82 is pivoted to the case, as by a hinge connection 84, so that it can swing between the working position shown in Fig. 2 where it is horizontal, and a folded or collapsed position where it is vertically disposed and immediately in front of the front wall 11 of the case.

The brace 83 extends upwardly from the base and may extend upwardly and inwardly from the outer end of the base toward the case A, and its upper end engages the structure formed by the support D and wall 70. In the particular case illustrated the frame 57 of support D has a depending bracket 85 with an opening 87 that receives a tongue 86 on the outer or upper end of wall 70. Through the bracket 85 the outer or projecting end portions of the support D and the wall 70 are, in effect, connected. The upper end of brace 83 is suitably joined to or connected with the structure just described and'in the case illustrated it is provided with a tongue 88 that engages through an opening 89 in tongue 86 and also through the opening 87 in bracket 85. As a result of this interconnection or engagement of parts the upper end portion of the brace is effectively connected to the connected rest and wall 70. In the preferred form of the invention the brace 83 is pivoted to the base 82 as by a hinge 90. With the rest D pivoted to the case, the wall 70 pivoted to the case, and the brace 83 pivoted to the base 82, it is possible to conveniently work or pivot these elements relative to each other in order to engage or disengage the tongues and bracket hereinabove described.

In the form of the invention illustrated a support 91 is provided between the brace 83 and the rest extension 60 and serves to effectively maintain the extension 60 horizontally disposed When the-parts are in operating position, as shown in Figs. 2 and 6 of the drawings. In the case illustrated the support 91 is pivotally connected to the brace 83 by a hinge 92 and it is pivotally connected to the outer edge of rest 60 by a hinge 93. With this construction the rest 60 is connected to the brace 83 so that these parts can be collapsed or folded together and into a collapsed position adjacent the base 82, as shown in Fig. 3 of the drawings.

In accordance with the present invention the base 82 pivoted to the case A and pivotally connecting the brace 83 is in the nature of a shallow cup-like element opening upwardly when in operating position, and it is shaped and proportioned so that when the brace 83 and the elements 91 and 68 are folded into it, as shown in Fig. 3, it can be swung upwardly in the direction indicated by the arrow X in Fig. 4, to a vertical position adjoining or abutting the front wall 11 of case A, in which position, it in effect, forms a complete cover for a wall 11 and serves to encase or cover the folded support as well as the folded Wall 70. The support D and wall 70 are related so that they both fold in to be together and against the front 11 of the case A and where the support D has a projecting bracket 85 and opening 97 is provided in the wall 11 to accommodate the projection so that the support can be arranged vertically and adjacent the wall 11. In the preferred arrangement the support D folds down or in and bears against the front 11 of the case, following which the well 7.0 folds up and in t overlie the rest D, whereupon the ,base 82 can lye-folded ,or-swung up to cover the other parts and ,to overlie the front 'l ltof the :case. A suitable fastener or fastening device 93 is provided for releasablysecuring the base :82 in the folded position where it is vertically disposed and covers the front of the case, as ,shown .in Fig. 1 0f the drawings.

The-light projector .G is provided to occur at a point suitably spaced above the support D and serves to receive light passed vertically through the panel of support D and to project and direct that light horizontally onto a screen, or the like. In the case illustrated the light projector involves a housing having a horizontal bottom 100, a vertical front 102, vertical sides 103 and a pitched or inclined back 104. The housing is thus substantially rectangular when viewed as illustrated in Fig. 2 ref the drawings. A suitable light handling lens or projector 105 is carried by the bottom of the housing anda suitable reflector 106 is carried in the housing so that light passed by the projector lens .102 strikes the reflector 106 and is directed horizontally through the front wall 102, which is provided with a transparent section 107 that passes the light. In the case illustrated the reflector 106 is carried by a pivotal mounting 108 and ;a suitable screw means 109 is provided for shifting or adjusting the reflector so that the light issuing .hor' izontally ,is suitably directed onto a screen or the like.

The mounting means H for the light projector supports the projector in vertical alignment with the rest D and in .the preferred form of the invention it involves, generally, ,a post 110 and a head 111 on the post and carrying the housing of the projector. The post 110 is slidably or telescopically engaged with the case An opening 112 is provided in the top 13 of the case, preferably at one corner of the case, and the post enters the case through the opening 112. A post guide 113 is provided in the case, for instance in the compartment of the case at one corner thereof, to slidably accommodate orcarry the post. In the preferred construction the guide 113 is a tubular longitudinally split guide and is provided with a clamp screw 114 so that it can be adjusted or .set from time to time to engage the post with the desired friction. The partitions in the case are provided with openings 116 in vertical alignment with the guide 13 so that the post can be operated into a collapsed position where it is entirely within the case and an extended position where its lower end portion is in the guide 113 while the balance of the post projects above the case, as shown in Fig. 2. A suitable means is provided for releasably securing the post in the last mentioned or working position. This means is shown as involving a pin 12.0 on the lower end portion of the case cooperating with a suitable bayonet slot 121 in the guide. By suitable reciprocation and rotation of the post it can be set in or released from the working position.

The head 111 involves a sleeve 130 engaged with the upper end portion ofthe post 110 and an arm 131 projects from the sleeve and is pivoted to the housing, preferably .to the back 104 .of the housing, by a pivot pin 132. -In the preferred construction the sleeve 130 is a split sleeve provided with a clamp screw 133 and it is thus such that itcan be applied to or removed from the upper end portion of the post as desired, and it can be positioned so that the arm 131 projects in the desired direction to support .the housing with the lens 105 in suitable alignment with the support D. With the construction and arrangement just described the sleeve 130 can be removed from the post and the arm 131 swung from the working position shown in Fig. 2 to a position where "it overlies and is adjacent the back 104 .of the housing, whereupon the projector G with the head 111 of means H attached thereto can be inserted or stored in the compartment '20 of the case, as indicated in dotted lines 'in'Fig. '1. With the elements just mentioned in- 8 r d in the comp rtm 2 t e o u e 2' -.an be swung up and latched closed.

From the foregoiug description it will be apparent that the construction, arrangement and relationship of parts provided by the present invention makes possible the provision .of a case A of limited size and of .convenient form, accommodating all .of .the other-elements of the structure, whether .in working position such as is shown in 2, or in collapsed and assembled position as shown in Fig. 1 Furthermore, the parts are such that they can be easily, quickly, and conveniently operated between the two positions and it will be apparent that the structure, when in ope-rating condition, is such as to efiectivelyandefiiciently handle the light generated by the lamp and serves to effectively project an image from the work rest, whether it be an image drawn thereon, applied thereto, or on a film or other transparency applied thereto. When the structure is in the folded .or collapsed condition, as shown in Fig. 1, it is of limited size, so that it can be readily stored, it is convenient to handle, and if desired, a suitable handle can be pro.- vided on the case, for instance, on the top thereof, as shown in the drawings.

Having described only a typical preferred form and application of my invention, I do not wish to be limited or restricted to the specific details herein set forth, but wish to reserve to myself any variations or modifications that may appear to those skilled in the art and fall within the scope of the following claims.

Having described my invention, I claim:

1. An air cooled picture projecting apparatus of the character described including, an elongate vertically dis.- posed case with horizontal top and bottom end walls and vertical front, side and rear walls, horizontally disposed upper and lower perforated partitions cooperating With the walls of the case to define a lower compartment, a middle compartment above the lower compartment and an upper compartment above the middle compartment, light generating means arranged in fixed position in the middle compartment adapted to direct a beam of light horizontally from the front side of the case including, a socket fixed to the lower partition and carrying a lamp and a condenser lensfixed to the front wall of the case adjacent the lamp, air circulating means having a motor driven fan arranged in fixed position in the lower compartment adapted to draw air into the lower compartment and to direct it up through the lower perforated partition into the middle compartment and up through the upper perforated partition into the upper compartment, there being an opening in the rear wall of the case for passage of air from the case and providing access to the upper compartment, a hinged closure for said opening, the upper partition in the case being releasably engaged in the case to be shiftable from its normal position to provide access to the lamp through the opening in the case, a light projector, means releasably supporting the projector on the exterior of the case above the case, an apertured film restbelow the projector and hinged to the front wall of the case and normally projecting horizontally therefrom, and a folding light handling device hinged to the front wall of the case below the rest and including a reflector adapted to normally receive the horizontal beam of light directed from the light generating means and directing it upwardly through the film est and to the projector, the film rest and the said light handling device being foldable one over the other and against the case, the means supporting the projector including a post telescopically engaged with the case to be wholly within the case when not in use and the pro.- jector adapted to be stored in the upper compartment when released from said supporting means. i

2. An air cooled picture projecting apparatus of the character described including, an elongate vertically disposed case with horizontal top and bottom end walls and vertical front, side and rear Walls, horizontally dis.-

posed upper and lower perforated partitions cooperating with the walls of the case to define a lower compartment, a middle compartment above the lower compartment and an upper compartment above the middle compartment, light generating means arranged in fixed position in the middle compartment adapted to direct a beam of light horizontally from the front side of the case including, a socket fixed. to the lower partition and carrying a lamp and a condenser lens fixed to the front wall of the case adjacent the lamp, air circulating means having a motor driven fan arranged in fixed position in the lower compartment adapted to draw air into the lower compartment and to direct it up through the lower perforated partition into the middle compartment and up through the upper perforated partition into the upper compartment, there being an opening in the rear wall of the case for passage of air from the case and providing access to the upper compartment, a light projector mounted on the exterior of the case to project upwardly and forwardly from the top thereof, an elongate film rest having one end pivoted to the front of the case and normally projecting horizontally therefrom to occur below the projector, and a folding light handling device pivoted to the front of the case to occur below the rest and including a reflector adapted to normally receive the beam of light from the light generating means and direct it upwardly through the film rest and to the projector, the said light handling device including an elongate forward wall carrying the reflector and having one end pivoted to the case and the other end engaging the other end of the rest and sides pivoted to the said forward wall and normally extending therefrom to the rest and to the front of the case, the sides being adapted to fold together and against the forward wall and the film rest being adapted to fold downwardly against the front of the case and the forward wall being adapted to fold upwardly over the folded rest.

3. An air cooled picture projecting apparatus of the character described including, an elongate vertically disposed case with horizontal top and bottom end walls and vertical front, side and rear walls, horizontally disposed upper and lower perforated partitions cooperating with the walls of the case to define a lower compartment, a

middle compartment above the lower compartment, and an upper compartment above the middle compartment, light generating means arranged in fixed position in the middle compartment adapted to direct a beam of light horizontally from the front side of the case including, a socket fixed to the lower partition and carrying a lamp and a condenser lens fixed to the front wall of the case adjacent the lamp, air circulating means having a motor driven fan arranged in fixed position in the lower compartment adapted to draw air into the lower compartment and to direct it up through the lower perforated partition into the middle compartment and up through the upper perforated partition into the upper compartment, there being an opening in the rear wall of the case for passage of air from the case and providing access to the upper com partment, a light projector mounted on the exterior of the case thereof, an elongate apertured film rest pivoted to the front of the case and normally projecting horizontally therefrom to occur below the projector, a folding light handling device pivoted to the case adjacent the lamp compartment and beneath the rest and including a reflector adapted to normally receive the beam of light from the generating means and directing it upwardly through the film rest and to the projector, the film rest and said light handling device being foldable one over the other and against the front of the case, and supporting means for the film rest and said light handling device including a base pivoted to and projecting forwardly from the bottom edge of the case and a brace pivoted to and projecting upwardly from the base and releasably connected to the film rest and said light handling device.

4. An air cooled picture projecting apparatus of the character described including, an elongate vertically disposed case with horizontal top and bottom end walls and vertical front, side and rear walls, horizontally disposed upper and lower perforated partitions cooperating with the walls of the case to define a lower compartment and an upper compartment above the middle compartment, light generating means arranged in fixed position in the middle compartment adapted to direct a beam of light horizontally from the front side of the case including, a socket fixed to the lower partition and carrying a lamp and a condenser lens fixed to the front wall of the case adjacent the lamp, air circulating means having a motor driven fan arranged in fixed position in the lower compartment adapted to draw air into the lower compartment and to direct it up through the lower perforated partition into the middle compartment and up through the upper I perforated partition into the upper compartment, there being an opening in the rear wall of the case for passage of air from the case and providing access to the upper compartment, a light projector mounted on the exterior of the case to project upwardly and forwardly therefrom, an

apertured film rest pivoted to the front of the case and normally projecting horizontally therefrom to occur below the projector, a folding light handling device pivoted to the front of the case below the rest and including a reflector adapted to normally receive the beam of light from the generating means and directing it upwardly through the film rest and to the projector, the rest and said device being foldable one over the other and against the front of the case, the film rest having a bracket thereon and the 1 said light handling device having a tongue engaging the bracket, and supporting means for the rest and said device including a base projecting forwardly from the front of the case at the bottom thereof and a brace projecting upwardly from the base and connected to the film rest and said light handling device where the tongue engages the bracket.

5. An air cooled picture projecting apparatus of the character described including, an elongate vertically disposed case with horizontal top and bottom end walls and vertical front, side and rear walls, horizontally disposed upper and lower perforated partitions cooperating with the walls of the case to define a lower compartment, 21 middle compartment above the lower compartment and an upper compartment above the middle compartment, light generating means arranged in fixed position in the middle compartment adapted to direct a beam of light horizontally from the front side of the case'- including, a socket fixed to the lower partition and carrying a lamp and a condenser lens fixed to the front wall of the case adjacent the lamp, air circulating means having a motor driven fan arranged in fixed position in the lower compartment adapted to draw air into the lower compartment and to direct it up through the lower perforated partition into the middle compartment and up through the upper perforated partition into the upper compartment, there being an opening in the rear wall of the case for passage of air from the case and providing access to the upper compartment, a light projector mounted on the exterior of the case to project upwardly and forwardly therefrom, an apertured film rest pivoted to the front of the case and normally projecting horizontally therefrom, a folding light handling device pivoted to the front of the case below the rest and including a reflector normally receiving light from the generating means and directing it upwardly through the film rest and to the projector, the film rest and said light handling device being foldable one over the other and against the front of the case, and a support for the film rest and said light handling device including, a base pivoted to the front of the case and normally projecting forwardly therefrom and a brace pivoted to the base and normally projecting upwardly therefrom to releasably engage and support the film rest and said light handling device, the brace being adapted to fold against the base and the base being adapted to fold against the 11 front of the case and over the f olde c 1 film rest and folded light handling device.

1 .An ai ool d Pi tu e Pmje t appara us of the character described including, an elongate vertically disposed casewith horizontal top and bottom ,end walls and vertical front, side and re l Walls, horizontally disposed upper and lower perforated partitions cooperating with the walls of the case to define a lower compartment, a middle compartment above the lower compartment and an upper compartment above the middle compartment, ligh gene a hig m ans arran ed in fi e p s n in the middle ,compa itment adapted to direct a beam of light horizontally from the front side of the case including, a sockt t fix d to the lower partition and carrying a lamp and acondenser lens fixed to the front wall of the case adjacent the lamp, air circulating means having a mOtor driven fan arranged in fixed position in the lower compartment adapted to draw air into the lower compartment and to direct it up through the lower perforated partition into the mi d c mpa t en and p through the pp perforated partition into the upper compartment, there being an opening in the rear wall .of the case for passage of air from the case and providing access to the upper compartment, a light projector, means releasabl-y supporting the projector on the exterior of the case including a post telescopically engaged With-the case from its top end wall and a head detachable from the post and carrying the projector, an apertured film rest pivoted to the front wall of the case and normally projecting horizontally therefrom, a folding light handling device below the rest and pivoted to the front wall of the case and including a reflector normally receiving light from :the generating means and directing it upwardly through the rest and to the projector, the rest and said device being foldable one over the other and against the front wall of the case, and a support for the film rest and said light handling device including, a base pivoted to the front wall of the case at the bottom thereof and normally projecting horizontally therefrom and a brace pivoted to the base and normally projecting upwardly therefrom to support the film rest and said light handling device, the brace being adapted to fold downwardly against the front of the base and over the folded .film rest and folded light handling device.

References Cited in the file of this patent UNITED STATES PATENTS 1,172,945 Cook Feb. 22, 1916 1,262,180 Davies Apr. 9, 1918 1,319,820 Williams Oct. 28, 1919 1,458,911 Blankenberg June 12, 1 923 1,666,307 Proctor Apr. 17, 1928 1,794,147 Chidester Feb. 24, 1931 1,831,762 Blohm Nov. 10, 1931 1,873,016 Oplinger et a1 Aug. 23, 1932 1,952,249 Halloran Mar. 27, 1934 1,966,531 Tint July 17, 1934 2,221,160 Worthington Nov. 12, 1940 2,330,799 Cocker et al. Oct. 5, 1943 2,381,260 Cooker Aug. 7, 1945 2,401,506 Pechkranz June 4, 1946 2,496,647 Woodbury Feb. 7, 1950 2,564,057 Fitzgerald Aug. 14, 1951

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Referenced by
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US2828666 *Jan 9, 1956Apr 1, 1958Victorlite Ind IncOverhead projector apparatus
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US4969733 *Oct 2, 1989Nov 13, 1990Dukane CorporationFoldable portable overhead projector
DE3622472A1 *Jul 4, 1986Jan 14, 1988DemoluxOverhead projector
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Classifications
U.S. Classification353/57, 353/99, 353/DIG.300, 353/119
International ClassificationG03B21/132
Cooperative ClassificationY10S353/03, G03B21/132
European ClassificationG03B21/132