Patent GB-822852-A (GB)
Title: Slide viewer
IPC: G02B27/02
Filed: 1957-06-24
Abstract: 822,852. Slide viewers. AIREQUIPT MANUFACTURING CO. Inc. June 24, 1957 [Sept, 25, 1956], No. 19860/57. Class 97(1) A slide viewer includes a slide storage compartment, a. viewing compartment next to the storage compartment containing a slide holder, and manually operable means for transferring a slide from one end of the storage compartment to the slide holder; the slide transfer means being adapted to move the slide holder transversely of the viewing compartment from the viewing position to the slide return position, return the slide from the holder to the other end of the storage compartment, and move the holder back to its orginal position ready to begin a new cycle. As shown in Fig. 1, the viewer has a slide storage compartment 1 housing a plurality of slides adjacent a viewing compartment 2 in which the slides are viewed sequentially by means of magnifying lenses in the compartment 3 whilst being illuminated from the compartment 4. The slide changing mechanism is housed in the casing and is operated by the handle 69 via the rod 68 and is shown in Fig. 7, where the slide holder 106 is at the viewing position in the viewing chamber. Outward movement of the bar 68 causes a follower finger 91 to engage the surface of a spring cam 78 at 86 by means of a slot 74 engaging a pillar 73 and moves a slide expelling finger 71 transversely towards the viewer; further extension of the bar 68 cause the finger 71 to engage the edge of a slide 100 and move it longitudinally along the system and into the slide holder 106 in a position for viewing. The bar 68 at the end of its outward movement actuates means for illuminating the slide. After the slide has been viewed, the bar 69 is pushed in the direction of the arrow 206, initially the impelling finger 71 remains stationary while the bar moves the length of the slot 74, but the rocking member 125 engages the rocking recess 124 in the bar 69 and actuates the lever 135 by contact of the projection 137 by the ledge 138 and thus move the slide holder 106 along the rails 144 in the direction of the arrow to the slide return position. When this point is reached, the far end of the slot co-operates with the column 73 and the member 209 engages the side of the slide 100 remote from the magazine and propels it off the holder 106 and inserts the storage container through the slot 29 in the direction of the arrow 27<SP>1</SP> to take up a position at the opposite end of the magazine from which it came, meanwhile the finger 71 is returned to its original position by a path displaced perpendicular to the direction of motion by means of the cam 78 so as not to impinge upon the transparency awaiting delivery to the viewing position. The slide holder 106 is returned to its original slide receiving position by the ridge 132 on the rocker 125 engaging the projection 137 on the lever 135 to rotate the latter in a clockwise direction and thus move the holder 106 back along the rails to the position shown in Fig. 17. At this stage the control arm is in its original position ready to commence another cycle of operation. The slides are urged towards the face 26 of the slide container by means of leaf springs. The apparatus may be used in a projecting device, and also for the viewing of single slides in which case they are inserted directly into the holder 106 through a slot in the roof of the casing whilst the contact arm 68 is fully extended.