CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation-in-part of U.S. application Ser. No. 07/591,052 entitled &#34;IMPROVED PHOTO DISPLAY DEVICE&#34; as filed on October 1, 1990, now U.S. Pat. No. 5,163,240. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates generally to a rotary-type photo display device and, more particularly, but not by way of limitation, it relates to an improved form of device capable of exhibiting a much greater number of photographs in either automatic or manually controlled mode of operation. 
     2. Description of the Prior Art 
     There have been a number of different developments in the past that relate to card or picture display devices of the rotary type. Card index devices are of general interest only since they are generally characterized by the fact that only one side of the card need be displayed after indexing. An early U.S. Pat. No. 1,813,442 discloses a mechanized rotary-type sign display which includes the two fields of view, i.e., the front of the top card is displayed simultaneously with the backside of the bottom card. U.S. Pat. No. 1,126,814 discloses another form of picture display device wherein rotary cartridges each containing a number of pictures can be selectively displayed. 
     The U.S. Pat. No. 1,214,732 in the name of Hopkins et al discloses a rotary indexing apparatus for bringing successive single pictures into view. There is no viewing of the backside of the photo holder and only a single card or picture presentation is made. The U.S. Pat. No. 978,162 discloses a different form of sign or picture exhibiting apparatus wherein the multiple of pictures is rotated in a horizontal plane about a vertical axis. U.S. Pat. No. 3,218,743 discloses a picture exhibiting apparatus that uses an album-type collection of individual photographs wherein each album can be inserted in the display device for subsequent individual viewing of the pictures. Finally, the U.S. Pat. No. 421,266 discloses a rotary-type photograph viewing exhibitor in combination with parlor or office furniture wherein the picture exhibitor may be selectively rotated to exhibit photos while other utilitarian aspects of the combination are available. In this case, an extremely delicate and complicated structure of hinge-stubs, pintles, tubes and spaces are utilized to hingedly secure the individual album-leaves for selective rotary viewing. 
     SUMMARY OF THE INVENTION 
     The present invention is an improved type of rotary picture exhibiting device wherein a great number of individual picture-holding envelopes, displaying pictures from both sides, are secured about an album spindle that may be removably placed in the viewing device. Control knobs having spaced bearing races and timing belt pulleys are force-fit into the ends of the spindle which can then be received into the housing in journal bearing races. A front frame also having mating Journal bearing races is then secured to the housing member to movably retain the album spindle which can then be rotated uni-directionally either manually or automatically to intermittently exhibit respective pairs of photographs, i.e., a backside photo of one envelope and the front side photo of a succeeding envelope. 
     Therefore, it is an object of the present invention to provide an attractive and functional photo display device that is adaptable to blend in with room decor. 
     It is also an object of the present invention to provide a device that offers protective storage of photographs while at the same time keeping the photos accessible for viewing. 
     It is still further an object of the present invention to provide a manual or automatically controlled photograph display device that is capable of exhibiting a greater number of photographs. 
     Finally, it is an object of the present invention to provide a photo display device that is economical to make and sell while being structurally reliable and capable of achieving pleasing aesthetic effect. 
    
    
     Other objects and advantages of the invention will be evident from the following detailed description when read in conjunction with the accompanying drawings which illustrate the invention. 
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a front view of the display device of the present invention; 
     FIG. 2 is a side view in exploded form of the housing member and front frame of the present invention; 
     FIG. 3A is a top plan view of an envelope as used in the present invention; 
     FIG. 3B is a side view in elevation of the envelope of FIG. 1A; 
     FIG. 4A is a top plan view of an envelope as it is heat welded onto a spindle in accordance with the present invention; 
     FIG. 4B is a side view in elevation of the envelope and spindle; 
     FIG. 5 is a side view in elevation of the spindle with a full complement of envelopes partially shown; 
     FIG. 6 is a sectional view taken along lines 6--6 of FIG. 1; 
     FIG. 7 is a partial side view with parts shown in phantom illustrating the drive mechanism of the present invention; 
     FIG. 8 is a side view in elevation of a spindle knob as used in the present invention; 
     FIG. 9 is a bottom plan view of the knob of FIG. 8; 
     FIG. 10 is a block diagram of electric control circuitry for the present invention; 
     FIG. 11 is a side view in vertical cross-section of an improved housing design for the display device; and 
     FIG. 12 is a front view in elevation of the housing member with front frame and interior components removed. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to FIGS. 1 and 2, a photograph display device 10 includes a front frame 12 as snap-fit over a housing 14. The front frame 12 includes opposite sides 16 and 18, top 20 and bottom 22 formed into a rectangular shape that provides a double or dual picture field of view. A comb 23 is formed around the inner edge of frame 12. Thus, the front viewing area 24 is divided into an upper area 26 for viewing a first picture and a lower viewing area 28 displaying a second picture. The viewing areas 26 and 28 are each adapted to receive standard-sized photographs, e.g., 31/2 by 5 inch snapshot prints. 
     Spindle knobs 30L and 30R, of identical construction, are disposed on each side of front frame 12. Referring also to FIG. 2, the assembled knobs 30L and 30R with spindle 32 (to be described) are maintained in operative position by assembly of front frame 12 and housing 14. Housing 14 is a unitary piece having side members 34L and 34R and curved back member 36 which extends all the way around from housing peak 38 to the forward portion of base 40. A semi-circular journal bearing race 42 is formed on each of housing sides 34L and 34R as a small upper race portion 44L and 44R of the race 42 formation serve as a pawl to coact with an annular groove of the respective spindle knob 30L to prevent back-up movement, as will be further described below. 
     As shown in FIG. 2, the front frame 12 is also formed with mating support races. The frame sides 16 and 18 each include semi-circular Journal race formations 46L and 46R that are adapted to coact with the race formations 42L and 42R to rotatably support the spindle assembly, to be further described. The front frame 12 may include a plurality of catch formations 48 which coact with mating bar formations (not shown) in the housing 14 to provide a removable snap-in closure. 
     Referring to FIGS. 3A and 3B, a photograph envelope 50 is constructed by folding a rectangular sheet of plastic slightly offset from bisection along a fold line 52 to form sides 54 and 56 while leaving a tab portion 58. A heat weldment 60 is then drawn across the envelope 50 to form the compartment having opposite sides 54 and 56. While any of several plastic films may be utilized, very good results have been achieved using polypropylene. 
     As shown in FIGS. 4A and 4B, the individual envelopes 50 are secured to the spindle 62 in like manner. Thus, the spindle 62 is formed from tube stock of similar plastic, e.g., polypropylene, and another heat seal or weldment 64 is drawn along the tab portion 58 of envelope 50 to cause secure adherence to the spindle 62. The use of the same types of polymer for formation of the envelopes 50 and spindle 62 enables an easy, secure weldment to be achieved. As shown in FIG. 5, a large plurality of envelopes 50 can then be secured around the spindle 62 in close spacing with each envelope 50 freely movable in hinge-like attachment. With about a one inch diameter spindle 62, as many as 50 envelopes can be secured in the array, thus accommodating 100 photographs with two per envelope. 
     FIG. 6 is a sectional view taken along the lines 6--6 indicated in FIG. 1 and showing disposition of the internal components within the housing 14. Thus, a lower rear compartment 66 provides mounting structure for containing a suitable type of gear motor 68 providing reduced speed rotational output to a drive pulley 70 driving a timing belt 72 (see FIG. 9). The timing belt 72 is led upward and meshed into engagement with a timing belt sprocket, as will be further described in FIGS. 7-9. 
     The spindle 62 is maintained in position by the journal bearing races 42L and R formed in housing side panels 34L and 34R as they coact in assembly with frame bearing races 46L and 46R (see FIG. 2). Actually, the tubular spindle 62 having inside cylindrical surface 74 receives spindle knobs 30L and 30R in opposite ends in force-fit. Referring to FIG. 8, each of the spindle knobs 30 includes a reduced diameter portion 76 having roughed surface adapted to press-fit into the inside diameter 74 of the spindle 62, and this formation extends into a timing belt sprocket gear formation 78 which, in turn, extends to a smooth circular bearing race 80 that provides rotational support within the housing/frame journal bearings. The outer end of spindle knob 30 is then formed with a knurled knob 82 that serves for manual rotation. As shown in FIG. 9, the underside of knurled knob portion 82 includes an annular recess 84 that includes ratchet notches 86 for coaction with the ratchet pawls 44L and 44R as shown in FIG. 2, which serve to prevent backward rotation of spindle 62. 
     Referring to FIG. 6, the spindle 62 rotates to move successive envelopes 50 past the upper horizontal comb 23a whereupon the envelope 50 falls forward to the lower position to bring two new photos into view. Actually comb 23a functions as an escapement mechanism which delays release of each upper envelope 50 thereby to provide a viewing pause for each pair of photos in the field of view, as is further discussed below. 
     FIG. 7 illustrates the drive system of the display device 10 in cutaway form as gear motor 68 provides rotational drive output to the drive pulley 70 as drive belt 72 rotates the timing belt sprocket 78 on the spindle knob 30L. Also shown is the ratchet pawl 44L as it rides in annular groove 84 in ratcheting coaction with notches 86L. A suitable type of gear motor 68, either AC or DC, can be selected from commercially available types. Primarily, selection should assure that the revolution rate of drive pulley 70 be slow enough to allow ample viewing time per photograph presentation. 
     A timing disk 90 rotated synchronously with drive pulley 70 includes a notch 92 that controls operation of a cycle switch 94, a selected type of microswitch. Thus, when notch 92 allows outward projection of feeler arm 96 the gear motor is in the OFF position; however, upon rotating by momentary switching or manual rotation whereupon feeler arm 92 is depressed, the energization of gear motor 68 will continue for one full rotation, the equivalent of a complete rotation of photograph spindle 62. An alternative mode of energization is to use a light activated switch that will cause the gear motor 68 to run continually any time there is ambient light, as will be further described. 
     FIG. 10 illustrates the control circuits 100 used with the display device 10. It is contemplated that there be three different types of operation, and these can be provided as separate production units or as a combined unit capable of all three modes of operation. A manual mode of operation is effected simply by rotating the manual control knob 30 to bring up successive pairs of photos for view. A second mode of operation, what may be termed cycle mode, operates under DC power source 102 through the cycle switch 94 to energize drive motor 68. That is, initial movement of manual control 30 moves the timing disk 90 so that microswitch 94 is energized, and this then energizes drive motor 68 for one full revolution or until timing disk 90 completes its revolution to deactivate feeler arm 92. A third or automatic mode of operation functions from an AC power source 104 to energize drive motor 68 through a control switch 106 whenever any ambient light is present and light sensor 108 actuates control switch 106. The gear motor or drive motor 68 must be selected from AC or DC types, depending upon the mode of operation. 
     When the spindle 62 is rotated the picture envelopes 50 are intermittently released from the upper position to the lower position (see FIG. 6). This is due to the positioning of spindle 62 relative to the comb 23a along the upper part 20 of frame 12. It can be seen that the envelopes 50 closest to comb 23a drag downward therealong before release for a certain short duration of arcuate movement of spindle 62. When envelope 50 clears comb 23a it then falls down to the lower level and the display includes in view the next photo from each of the top envelope and bottom envelope. The amount of time of view for successive pairs of pictures is a function of the rotational output speed of gear motor 68. 
     FIGS. 11 and 12 illustrate an improved form of housing 14a that includes a pair of stabilizer segments 110 and 112. The basic shape and formation of housing 14a remain the same or similar with curved back member 36, base 40 and side walls 34L and 34R. The bearing races 42 and 42R are also similarly formed with pawl portions 44L and 44R. The point of departure comes with inclusion of stabilizer segments 110 and 112 on opposite interior sides of the housing 14a. 
     Stabilizers 110 and 112 are each affixed to the housing back wall 36 to extend in parallel to a point just inside of the respective bearing race 42L and 42R. The segments 110 and 112 extend from the secured back edge 114 to define a front edge 116L and 116R that lies generally parallel with and slightly inside of the front edge of respective side members 34L and 34R. The front edges 116L and 116R are then formed with a respective semicircular cut-out 118L and 118R which are disposed in juxtaposition to respective journal bearing races 42L and 42R but of slightly larger radius. 
     Thus, when a spindle 62 of photo envelopes 50 is put in the housing 14a for viewing, the segments 110 and 112 will be closely positioned on each side of the envelopes 50 to prevent any sideways movement of photographs from within their respective envelope 50. Segments 110 and 112 tend to maintain orderly positioning of the multiple of photographs thereby to enhance the viewing sequence while also protecting the individual pictures. 
     The foregoing discloses a much improved form of photograph display device that has the capability of reliable exposition of a large number of photographs. The unit is trim and capable of achieving desirable aesthetic effect, and it may be utilized in any of several different modes of operation, depending upon the exigencies of the particular usage. Additionally, picture storage is effected by the use of a plurality of spindle/envelope units, each of which may contain upwards of 100 photographs and each being readily interchangeable in the exposition device. 
     Changes may be made in combination and arrangement of elements as heretofore set forth in the specification and shown in the drawings; it being understood that changes may be made in the embodiments disclosed without departing from the spirit and scope of the invention as defined in the following claims.
A device for storage and display of photographs consisting of a housing with front frame and a spindle containing photo envelopes supported mid-way across the front frame. The spindle is formed in unique manner to carry a large plurality of photo envelopes by heat welding each envelope to the spindle in close spacing. Each envelope contains two photos back-to-back, and rotation, either manually or motor controlled, indexes intermittent display of the successive photos with two photos always in view in the frame.