Control specifically for animal buildings

Claim 2

In a control mechanism for controlling ventilation, a sensing element having a variable resistor, a transistor switching mechanism energized and connected to the sensing mechanism to respond to its change in resistance, a relay connected to the output side of the transistor switching mechanism, a series of ventilators, and means controlled by energizing the relay to operate the ventilators, in which the transistor switching mechanism includes a PNP junction transistor and a NPN junction transistor, the input side of the switching mechanism being connected with the collector of the PNP junction transistor and the base of the NPN junction transistor being also connected to the input, and the output side of the transistor switching mechanism being connected with the collector of the NPN junction transistor, and the base of the PNP junction transistor being connected to the output, the respective emitters of the transistors being connected to the high and low side of the power source.

Claim 3

A mechanism in accordance with claim 1, having a time delay network interposed between the sensing resistor and the input of the transistor switching mechanism.

Claim 4

A mechanism of claim 2, in which the time delay network includes a time delay capacitor and time delay resistors, a first time delay resistor being connected in series with the capacitor between the sensing resistor and the input of the switching transistors, and a second time delay resistor being connected in parallel with the condenser and in series with the first time delay resistor.

Claim 5

A mechanism of claim 3, in which the first and second time delay resistors are part of a potentiometer, which includes means for increasing and reducing their resistance in unison.

Claim 6

A mechanism of claim 4, in which the time delay network also includes a third time delay resistor in parallel with the first time delay resistors and with the capacitor.

Claim 7

A mechanism of claim 5, in which the time delay network also includes a fourth time delay resistor and a fifth time delay resistor which are in series with the first time delay resistor and in parallel with the capacitor, and the second time delay resistor, the input of the switching transistors being connected between the fourth and fifth time delay resistors.

Claim 8

A mechanism of claim 6, in which the switching transistor mechanism includes a first PNP junction transistor, a second NPN junction transistor and a third PNP junction transistor, and first, second and third switching resistors, the first transistor being connected with its collector on the input side, its emitter connected through the first switching resistor to the high side of the power source and its basE connected through the second switching resistor to the base of the third switching resistor, the second switching transistor having its base connected to the input, its emitter connected to the grounded side of the power source, and its collector connected to the second switching resistor and through it to the base of the third switching transistor, the third switching resistor being connected between the base of the third switching transistor and the high side of the power source, the emitter of the third switching transistor being connected to the high side of the power source, and the collector of the third switching transistor being connected to one side of the relay.

Claim 9

In a control mechanism, a device to be under control, electromechanical means to operate the device, relay means to energize and deenergize the electromechanical means, a sensor including a variable resistance operatively connected in the circuit and a transistor switching unit operatively connected at the input side to the sensor resistor and the output side to the relay including a PNP junction transistor and a NPN junction transistor, the PNP junction transistor havings its collector connected to the input and the NPN junction transistor having its base connected to the input, the PNP junction transistor having its base connected to the output and the NPN junction transistor having its collector connected to the output and the transistors having their emitters connected across the power source.

Claim 10

In a control mechanism, a device to be under control, electromechanical means to operate the device, relay means to energize and deenergize the electromechanical means, a sensor including a variable resistance operatively connected in the circuit and a transistor switching unit operatively connected at the input side to the sensor resistor and the output side to the relay including a PNP junction transistor and a NPN junction transistor, the PNP junction transistor havings its collector connected to the input and the NPN junction transistor having its base connected to the input, the PNP junction transistor having its base connected to the output and the NPN junction transistor having its collector connected to the output and the transistors having their emitters connected across the power source.

Claim 11

A mechanism of claim 8, including a time delay network between the sensor resistor and the input of the switching transistors, evaluating the presence and intensity of the sun, said time delay network including a first and a second time delay resistor, a time delay capacitor in series with the first time delay resistor and in parallel with the second time delay resistor, the said first and second time delay resistors being gang connected so that they can increase and reduce their resistance in unison.

Claim 12

A mechanism of claim 9, in which the time delay network includes a third time delay resistor in series with the sensor resistor and in parallel with the series connected first time delay resistor and capacitor, and a fourth and fifth time delay resistor in parallel with the capacitor and in parallel with the second time delay resistor but in series with the first time delay resistor, the output to the transistor switching unit being connected intermediate between the fourth and fifth time delay resistors, and the fifth time delay resistor being connected to ground.

Claim 13

In a control mechanism for controlling ventilation, a sensing element having a variable resistor, an integrating time-delay means receiving the signal from the sensing element and responsive to its time and intensity, a transistor switching means energized by and connected to the time-delay means to respond to it after an interval determined by it if the time and intensity is sufficient to cause any response, a relay connected to the output side of the transistor switching mechanism, a series of ventilators, and means controlled by energizing the relay to operate the ventilators.

Claim 14

In a control mechanism for controlling ventilation, a sensing element having a variable resistor, an integrating time-delay means receiving the signal from the sensing element and responsive to its time and intensity, a transistor switching means energized by and connected to the time-delay means to respond to it after an interval determined by it if the time and intensity is sufficient to cause any response, a relay connected to the output side of the transistor switching mechanism, a series of ventilators, and means controlled by energizing the relay to operate the ventilators.

Claim 15

In a control for ventilators, a sensing resistor whose resistance is responsive to the duration and intensity of a quantity sensed, means providing a steady state voltage imposed on the sensing resistor, an electronic timer having a capacitor in circuit with the sensing resistor and the source of steady stage voltage, a transistor switching unit responsive to the voltage from the capacitor, relay means receiving the output from the switching unit, a reversible motor having two fields, one field for each direction of operation, limit switches electrically connected to the fields and mechanically connected to the ventilators, one of which is closed when the other is open corresponding to the position of the ventilators, and circuit means connecting the relay means, the switches and the fields with a source of electric power.

Claim 16

In a control for ventilators, a sensing resistor whose resistance is responsive to the duration and intensity of a quantity sensed, means providing a steady state voltage imposed on the sensing resistor, an electronic timer having a capacitor in circuit with the sensing resistor and the source of steady stage voltage, a transistor switching unit responsive to the voltage from the capacitor, relay means receiving the output from the switching unit, a reversible motor having two fields, one field for each direction of operation, limit switches electrically connected to the fields and mechanically connected to the ventilators, one of which is closed when the other is open corresponding to the position of the ventilators, and circuit means connecting the relay means, the switches and the fields with a source of electric power.