Apparatus for remotely controlling a slide projector

Claim 2

In an improved control mechanism for remotely controlling an automatic slide projector having operatable means for applying an electrical signal of alternating polarity to said projector and a housing in which is included means energizable foR effecting a particular predetermined projector control operation, and an electrical cable having at least one conductor interconnecting the housing and said control mechanism for selectively controlling said projector, said control mechanism compising: a. switch means connected to said one conductor leading to said projector and movable into first and second positions; and b. electrical circuit means operatively associated with said switch means, said electrical circuit means including means for defining a first circuit when said switch means is in said first position responsive to a particular polarity of the alternating electrical signal for actuating said operatable means to remove electrical power for said projector and means for defining a second circuit when said switch means is in said second position responsive to a polarity of the alternating signal opposite to said particular polarity for enabling said energizable means to be energized so that the predetermined projector control operation can be effected.

Claim 3

In an improved control mechanism for remotely controlling an automatic slide projector having operatable means for applying an electrical signal of alternating polarity to said projector and a housing in which is included means energizable foR effecting a particular predetermined projector control operation, and an electrical cable having at least one conductor interconnecting the housing and said control mechanism for selectively controlling said projector, said control mechanism compising: a. switch means connected to said one conductor leading to said projector and movable into first and second positions; and b. electrical circuit means operatively associated with said switch means, said electrical circuit means including means for defining a first circuit when said switch means is in said first position responsive to a particular polarity of the alternating electrical signal for actuating said operatable means to remove electrical power for said projector and means for defining a second circuit when said switch means is in said second position responsive to a polarity of the alternating signal opposite to said particular polarity for enabling said energizable means to be energized so that the predetermined projector control operation can be effected.

Claim 4

In an improved control mechanism for remotely controlling an automatic slide projector having operatable means for applying an electrical signal of alternating polarity to said projector and a housing in which is included means energizable foR effecting a particular predetermined projector control operation, and an electrical cable having at least one conductor interconnecting the housing and said control mechanism for selectively controlling said projector, said control mechanism compising: a. switch means connected to said one conductor leading to said projector and movable into first and second positions; and b. electrical circuit means operatively associated with said switch means, said electrical circuit means including means for defining a first circuit when said switch means is in said first position responsive to a particular polarity of the alternating electrical signal for actuating said operatable means to remove electrical power for said projector and means for defining a second circuit when said switch means is in said second position responsive to a polarity of the alternating signal opposite to said particular polarity for enabling said energizable means to be energized so that the predetermined projector control operation can be effected.

Claim 5

In an improved remote control mechanism for an automatic slide projector having relay means operatable for applying an electrical input signal of alternating polarity to said projector and a housing in which is included a focusing lens, a focus drive motor selectively energizable to movably position the focusing lens, and means automatically energizable for movably positioning the focusing lens in forward and reverse directions relative to a projector focal plane independent of said focus drive motor, and an electrical cable having at least first and second conductors interconnecting said housing and said remote control mechanism for selectively controlling said projector, said control mechanism comprising: a. first switch means connectable to said focus drive motor over said first conductor and movable to a first position to enable current to be supplied thereto in a first direction whereby the focusing lens is moved in a focus forward direction and a second position to enable current to be supplied to said focus drive motor in a second direction opposite to said first direction whereby the focusing lens is moved in a focus reverse direction; b. second switch means connected to said second conductor leading to said projector and movable into first and second positions; and c. electrical circuit means operatively associated with said second switch means, said electrical control means including means, including said second conductor, for defining a first circuit when said second switch means is in its first position responsive to a signal of one polarity for actuating said operatable means so as to interrupt said electrical signal to said projector and means, including said second conductor, for defining a second circuit when said second switch means is in said second position responsive to a current signal of a polarity opposite to said one polarity for transmitting a control signal to said projector along said second conductor, said control signal having one component for actuating said operatable means to restore said electrical signal to said projector and having a second component for overriding said automatically energizable means so that actuation of said first switch means is effective to supply current to said focus drive motor.

Claim 6

In an improved remote control mechanism for an automatic slide projector having relay means operatable for applying an electrical input signal of alternating polarity to said projector and a housing in which is included a focusing lens, a focus drive motor selectively energizable to movably position the focusing lens, and means automatically energizable for movably positioning the focusing lens in forward and reverse directions relative to a projector focal plane independent of said focus drive motor, and an electrical cable having at least first and second conductors interconnecting said housing and said remote control mechanism for selectively controlling said projector, said control mechanism comprising: a. first switch means connectable to said focus drive motor over said first conductor and movable to a first position to enable current to be supplied thereto in a first direction whereby the focusing lens is moved in a focus forward direction and a second position to enable current to be supplied to said focus drive motor in a second direction opposite to said first direction whereby the focusing lens is moved in a focus reverse direction; b. second switch means connected to said second conductor leading to said projector and movable into first and second positions; and c. electrical circuit means operatively associated with said second switch means, said electrical control means including means, including said second conductor, for defining a first circuit when said second switch means is in its first position responsive to a signal of one polarity for actuating said operatable means so as to interrupt said electrical signal to said projector and means, including said second conductor, for defining a second circuit when said second switch means is in said second position responsive to a current signal of a polarity opposite to said one polarity for transmitting a control signal to said projector along said second conductor, said control signal having one component for actuating said operatable means to restore said electrical signal to said projector and having a second component for overriding said automatically energizable means so that actuation of said first switch means is effective to supply current to said focus drive motor.

Claim 7

In an improved remote control mechanism for an automatic slide projector having relay means operatable for applying an electrical input signal of alternating polarity to said projector and a housing in which is included a focusing lens, a focus drive motor selectively energizable to movably position the focusing lens, and means automatically energizable for movably positioning the focusing lens in forward and reverse directions relative to a projector focal plane independent of said focus drive motor, and an electrical cable having at least first and second conductors interconnecting said housing and said remote control mechanism for selectively controlling said projector, said control mechanism compRising: a. a first switch means connectable to said focus drive motor over said first conductor and movable to a first position to supply current thereto in a first direction whereby the focusing lens is moved in a focus forward direction and a second position to supply current to said focus drive motor in a second direction opposite to said first direction whereby the focusing lens is moved in a focus reverse direction; b. a selector switch having first and second actuatable positions; c. first circuit means including said second conductor energizable when said selector switch is in its first position for producing a control signal to operate said relay means to interrupt power to said projector; and d. second circuit means including said second conductor energizable when said selector switch is in its second position for producing a control signal over said second conductor to override said automatically energizable means to enable said focus drive motor to drive the focusing lens in either direction upon actuation of said first switch means.

Claim 8

In an improved remote control mechanism for an automatic slide projector having relay means operatable for applying an electrical input signal of alternating polarity to said projector and a housing in which is included a focusing lens, a focus drive motor selectively energizable to movably position the focusing lens, and means automatically energizable for movably positioning the focusing lens in forward and reverse directions relative to a projector focal plane independent of said focus drive motor, and an electrical cable having at least first and second conductors interconnecting said housing and said remote control mechanism for selectively controlling said projector, said control mechanism compRising: a. a first switch means connectable to said focus drive motor over said first conductor and movable to a first position to supply current thereto in a first direction whereby the focusing lens is moved in a focus forward direction and a second position to supply current to said focus drive motor in a second direction opposite to said first direction whereby the focusing lens is moved in a focus reverse direction; b. a selector switch having first and second actuatable positions; c. first circuit means including said second conductor energizable when said selector switch is in its first position for producing a control signal to operate said relay means to interrupt power to said projector; and d. second circuit means including said second conductor energizable when said selector switch is in its second position for producing a control signal over said second conductor to override said automatically energizable means to enable said focus drive motor to drive the focusing lens in either direction upon actuation of said first switch means.

Claim 9

A control mechanism as set forth in claim 3 wherein said first circuit means includes current control means for preventing said relay means from being energized when said second circuit means is energized.

Claim 10

A control mechanism as set forth in claim 3 wherein said second circuit means includes means for applying an electrical signal of alternating polarity to said second circuit means, current control means rendering said second circuit means conductive when said electrical signal has a predetermined polarity, electronic switching means having control input means coupled to said current control means for rendering said electronic switching means conductive and nonconductive, and a capacitor coupled to said electronic switching means and adapted to produce a signal to maintain said electronic switching means conductive during time intervals said electrical signal is of a polarity opposite to said particular polarity.