Multiple transparency display unit and sequencing control therefor

Claim 2

A multiple transparency display unit and sequencing control comprising means for supporting a plurality of transparencies, illumination means for each transparency, a stepping switch including a plurality of fixed contacts and a movable contact successively engageable with said fixed contacts, means for stepping said movable contact from one fixed contact to the next adjacent fixed contact, a plurality of individually adjustable means for controlling said stepping means to vary the stepping intervals and hence the period of energization of each illumination means, and means connecting at least certain of said fixed contacts in circuit with at least certain of said illumination means whereby those illumination means connected in circuit are energized only when said movable contact engages the particular fixed contact electrically associated with the selected illumination means and whereby only each illumination means is energized for a period determined by the individual adjustment of the particular adjustable means associated therewith.

Claim 3

A multiple transparency display unit and sequencing control comprising a cabinet having a plurality of forwardly facing individual compartments open at the front, a lamp disposed in each compartment adjacent the rear thereof so that light therefrom will pass through the open front of the compartment and any transparency associated therewith, means for selectively energizing each lamp, and an adjustable impedance means for each lamp for determining the period that each lamp is energized, said impedance means including an adjustable resistor for each lamp and a capacitor common to the various lamps to provide a resistance-capacitance circuit for each lamp, said means for energizing said lamp including a stepping switch having a plurality of fixed contacts, a wiper arm successively engageable with said fixed contacts, a coil and armature for advancing said wiper arm from contact to contact, and means controlled by said resistance-capacitance circuit for providing pulses to said coil to effect the successive advancement of said wiper arm from contact to contact after a delay period determined by the setting of the adjustable resistor for the particular fixed contact with which the wiper arm is then engaged.

Claim 4

A multiple transparency display unit and sequencing control comprising a cabinet having a plurality of forwardly facing individual compartments open at the front, a lamp disposed in each compartment adjacent the rear thereof so that light therefrom will pass through the open front of the compartment and any transparency associated therewith, means for selectively energizing each lamp, and an adjustable impedance means for each lamp for determining the period that each lamp is energized, said impedance means including an adjustable resistor for each lamp and a capacitor common to the various lamps to provide a resistance-capacitance circuit for each lamp, said means for energizing said lamp including a stepping switch having a plurality of fixed contacts, a wiper arm successively engageable with said fixed contacts, a coil and armature for advancing said wiper arm from contact to contact, and means controlled by said resistance-capacitance circuit for providing pulses to said coil to effect the successive advancement of said wiper arm from contact to contact after a delay period determined by the setting of the adjustable resistor for the particular fixed contact with which the wiper arm is then engaged.

Claim 5

A multiple transparency display unit and sequencing control comprising means for supporting a plurality of transparencies, illumination means for each transparency, a stepping switch including a plurality of fixed contacts and a movable contact successively engageable with said fixed contacts, means for stepping said movable contact from one fixed contact to the next adjacent fixed contact, adjustable means for controlling said stepping means to vary the stepping intervals aNd hence the period of energization of said illumination means, said controlling means including an adjustable resistor connected in circuit between its associated fixed contact and said stepping means, and means connecting at least certain of said fixed contacts in circuit with at least certain of said illumination means whereby those illumination means connected in circuit are energized only when said movable contact engages the particular fixed contact electrically associated with the selected illumination means.

Claim 6

A multiple transparency display unit and sequencing control comprising means for supporting a plurality of transparencies, illumination means for each transparency, a stepping switch including a plurality of fixed contacts and a movable contact successively engageable with said fixed contacts, means for stepping said movable contact from one fixed contact to the next adjacent fixed contact, adjustable means for controlling said stepping means to vary the stepping intervals aNd hence the period of energization of said illumination means, said controlling means including an adjustable resistor connected in circuit between its associated fixed contact and said stepping means, and means connecting at least certain of said fixed contacts in circuit with at least certain of said illumination means whereby those illumination means connected in circuit are energized only when said movable contact engages the particular fixed contact electrically associated with the selected illumination means.

Claim 7

A multiple transparency display unit and sequencing control in accordance with claim 3 in which a capacitor is included in circuit with said various adjustable resistors, and a unijunction triggered by the time constant provided by said resistors and capacitors, a silicon controlled rectifier gated by said unijunction transistor and in circuit with said stepping means so that pulses are delivered to said stepping means each time that said rectifier is fired by said unijunction transistor.

Claim 8

A multiple transparency display unit and sequencing control in accordance with claim 4 in which said connecting means includes a plurality of conductors each selectively connectable between a fixed contact and an illumination means so that the sequencing of said various illumination means depends upon the selected connection of said conductors with said fixed contacts and also with said various illumination means.