Proximity detector

Claim 2

A fail-safe radiation detector and control sensor to register a signal of the proximity between relatively movable objects each having means to project a radiating signal comprising a radiation detector means having a defined field of view and mounted on one of such objects to receive and respond to said radiating signal from the other object when they are within a preselected range distance of each other, a first and second enclosed sensing element respectively connected in series between a positive voltage and ground to provide a lower positive voltage at their juncture, only said first sensor element positioned to receive said radiation signal, an NPN transistor having its base connected to said juncture and its collector and emitter each connected through a resistor respectively to said positive voltage and to ground, a second NPN transistor having its base connected to a voltage divider between said positive voltage and ground and its collector through a resistor to said positive voltage and its emitter to the emitter of said first transistor to apply bias for the latter, a third PNP transistor having its base connected to the collector of said first transistor and its emitter to said positive voltage and its collector through two resistors to ground, a fourth transistor having its base connected between said two resistors and its emitter connected to ground and its collector to one end of a DC relay the other end of which is connected to said positive voltage, a first contact heel of said DC relay connected to a condenser the other side of which is connected to ground and its front contact connected to said positive voltage and its back contact connected to a signal relay the other side of which is connected to ground, a time delay in opening condenser connected across said signal relay, a radiating signal means enclosed with said exposed sensor element and having one end connected to positive voltage and the other filament end connected to a second back contact of said DC relay the second heel of which is connected to ground.

Claim 3

A fail-safe radiation detector and control sensor to register a signal of the proximity between relatively movable objects Each having means to project a radiating signal comprising a radiation detector means having a defined field of view and mounted on one of such objects to receive and respond to said radiating signal from the other object when they are within a preselected range distance of each other, a first and second enclosed sensing element respectively connected in series between a positive voltage and ground to provide a lower positive voltage at their juncture, only said first sensor element positioned to receive said radiation signal, an NPN transistor having its base connected to said juncture and its collector and emitter each connected through a first and second resistor respectively to said positive voltage and to ground, a second NPN transistor having its base connected to a voltage divider between said positive voltage and ground and its collector through a resistor to said positive voltage and its emitter to the emitter of said first transistor to apply bias for the latter, a third PNP transistor having its base connected to the collector of said first transistor and its emitter to said positive voltage and its collector through tow resistors to ground, a fourth transistor having its base connected between said two resistors and its emitter connected ground and its collector to one end of a DC relay the other end of which is connected to said positive voltage, a first contact heel of said DC relay connected to ground and its front and back contact connected to the opposite ends of a primary transformer the center tap of which is connected to said positive voltage, a secondary of said transformer connected through rectifiers to supply DC to energize a signal relay which functions when deenergized, a radiating signal means enclosed with said exposed sensor element and having one end connected to positive voltage and the other filament end connected to a second back contact of said DC relay the second heel of which is connected to ground.

Claim 4

A fail-safe radiation detector and control sensor to register a signal of the proximity between relatively movable objects Each having means to project a radiating signal comprising a radiation detector means having a defined field of view and mounted on one of such objects to receive and respond to said radiating signal from the other object when they are within a preselected range distance of each other, a first and second enclosed sensing element respectively connected in series between a positive voltage and ground to provide a lower positive voltage at their juncture, only said first sensor element positioned to receive said radiation signal, an NPN transistor having its base connected to said juncture and its collector and emitter each connected through a first and second resistor respectively to said positive voltage and to ground, a second NPN transistor having its base connected to a voltage divider between said positive voltage and ground and its collector through a resistor to said positive voltage and its emitter to the emitter of said first transistor to apply bias for the latter, a third PNP transistor having its base connected to the collector of said first transistor and its emitter to said positive voltage and its collector through tow resistors to ground, a fourth transistor having its base connected between said two resistors and its emitter connected ground and its collector to one end of a DC relay the other end of which is connected to said positive voltage, a first contact heel of said DC relay connected to ground and its front and back contact connected to the opposite ends of a primary transformer the center tap of which is connected to said positive voltage, a secondary of said transformer connected through rectifiers to supply DC to energize a signal relay which functions when deenergized, a radiating signal means enclosed with said exposed sensor element and having one end connected to positive voltage and the other filament end connected to a second back contact of said DC relay the second heel of which is connected to ground.

Claim 5

A fail-safe radiation detector and control sensor to register a signal of the proximity between relatively movable objects each having means to project a radiating signal comprising a radiation detector means having a defined field of view and mounted on one of such objects to receive and respond to said radiating signal from the other object when they are within a preselected range distance of each other, a first and second enclosed sensing element respectively connected in series between a positive voltage and ground to provide a lower positive voltage at their juncture, only said first sensor element positioned to receive said radiation signal, an NPN transistor having its base connected to said juncture and its collector and emitter each connected respectively through a first and second resistor to said positive voltage and ground, a second NPN transistor having its base connected to a voltage divider between said positive voltage and ground and its collector connected through a resistor to said positive voltage and its emitter to the emitter of said first transistor to apply bias for the latter, a third PNP transistor having its base connected to the collector of said first transistor and its emitter to said positive voltage and its collector through two resistors to ground, a fourth transistor having its base connected between said two resistors and its emitter connected to ground, a condenser connected in parallel with said first resistor, a radiating signal means enclosed with said exposed sensor element and having one end connected to a positive voltage and its other end excited by a controlled pulsating current, a first transformer having its secondary connected through bridge connected rectifiers to supply DC to energize a signal relay, a pair of transistors having their collectors connected to the opposite ends of the primary of said first transformer and their emitters connected through respective resistors to a mid tap of the secondary of a second transformer and to ground and their bases connected respEctively to the opposite ends of said second transformer secondary and said second transformer primary having one end connected to the collector of said fourth transistor and its other end to positive voltage.

Claim 6

A fail-safe radiation detector and control sensor to register a signal of the proximity between relatively movable objects each having means to project a radiating signal comprising a radiation detector means having a defined field of view and mounted on one of such objects to receive and respond to said radiating signal from the other object when they are within a preselected range distance of each other, a first and second enclosed sensing element respectively connected in series between a positive voltage and ground to provide a lower positive voltage at their juncture, only said first sensor element positioned to receive said radiation signal, an NPN transistor having its base connected to said juncture and its collector and emitter each connected respectively through a first and second resistor to said positive voltage and ground, a second NPN transistor having its base connected to a voltage divider between said positive voltage and ground and its collector connected through a resistor to said positive voltage and its emitter to the emitter of said first transistor to apply bias for the latter, a third PNP transistor having its base connected to the collector of said first transistor and its emitter to said positive voltage and its collector through two resistors to ground, a fourth transistor having its base connected between said two resistors and its emitter connected to ground, a condenser connected in parallel with said first resistor, a radiating signal means enclosed with said exposed sensor element and having one end connected to a positive voltage and its other end excited by a controlled pulsating current, a first transformer having its secondary connected through bridge connected rectifiers to supply DC to energize a signal relay, a pair of transistors having their collectors connected to the opposite ends of the primary of said first transformer and their emitters connected through respective resistors to a mid tap of the secondary of a second transformer and to ground and their bases connected respEctively to the opposite ends of said second transformer secondary and said second transformer primary having one end connected to the collector of said fourth transistor and its other end to positive voltage.

Claim 7

A fail-safe radiation detector and control sensor to register a signal of the proximity between relatively movable objects each having means to project a radiating signal comprising a radiation detector means having a defined field of view and mounted on one of such objects to receive and respond to said radiating signal from the other object when they are within a preselected range distance of each other, a first and second enclosed sensing element respectively connected in series between a positive voltage and ground to provide a lower positive voltage at their juncture, only said first sensor element positioned to receive said radiation signal, an NPN transistor having its base connected to said juncture and its collector and emitter each connected respectively through a first and second resistor to said positive voltage and ground, a second NPN transistor having its base connected to a voltage divider between said positive voltage and ground and its collector connected through a resistor to said positive voltage and its emitter to the emitter of said first transistor to apply bias for the latter, a third PNP transistor having its base connected to the collector of said first transistor and its emitter to said positive voltage and its collector through two resistors to ground, a fourth transistor having its base connected between said two resistors and its emitter connected to ground, a condenser connected in parallel with said first resistor, a radiating signal means enclosed with said exposed sensor element and excited by a controlled pulsating current, a first transformer having its secondary connected through rectifiers to supply DC to energize a signal relay, a pair of transistors having their collectors connected to the opposite ends of the primary of said first transformer and their emitters connected through respective resistors to a mid tap of the secondary of a second transformer and to ground and their bases connected respectively to the emitters of two amplifying transistors the emitters of each being also connected through a respective resistor to ground and their collectors each being connected through a respective resistor to said positive DC voltage and their bases connected respectively to the opposite ends of said second transformer secondary, said second transformer primary having one end connected to the collector of said fourth transistor and its other end connected through a resistor to positive voltage with a condenser in parallel.

Claim 8

A fail-safe radiation detector and control sensor to register a signal of the proximity between relatively movable objects each having means to project a radiating signal comprising a radiation detector means having a defined field of view and mounted on one of such objects to receive and respond to said radiating signal from the other object when they are within a preselected range distance of each other, a first and second enclosed sensing element respectively connected in series between a positive voltage and ground to provide a lower positive voltage at their juncture, only said first sensor element positioned to receive said radiation signal, an NPN transistor having its base connected to said juncture and its collector and emitter each connected respectively through a first and second resistor to said positive voltage and ground, a second NPN transistor having its base connected to a voltage divider between said positive voltage and ground and its collector connected through a resistor to said positive voltage and its emitter to the emitter of said first transistor to apply bias for the latter, a third PNP transistor having its base connected to the collector of said first transistor and its emitter to said positive voltage and its collector through two resistors to ground, a fourth transistor having its base connected between said two resistors and its emitter connected to ground, a condenser connected in parallel with said first resistor, a radiating signal means enclosed with said exposed sensor element and excited by a controlled pulsating current, a first transformer having its secondary connected through rectifiers to supply DC to energize a signal relay, a pair of transistors having their collectors connected to the opposite ends of the primary of said first transformer and their emitters connected through respective resistors to a mid tap of the secondary of a second transformer and to ground and their bases connected respectively to the emitters of two amplifying transistors the emitters of each being also connected through a respective resistor to ground and their collectors each being connected through a respective resistor to said positive DC voltage and their bases connected respectively to the opposite ends of said second transformer secondary, said second transformer primary having one end connected to the collector of said fourth transistor and its other end connected through a resistor to positive voltage with a condenser in parallel.

Claim 9

The fail-safe radiation detector and control sensor of claim 4 characterized by a multivibrator circuit to supply a controlled pulsating current to energize said radiating signal means and comprising a third pair of transistors with their emitters connected together to ground and the base of one transistor connected through a diode means a condenser and a resistor means to one side of said radiating signal means and the base of the other transistor connected through a diode and resistor to the other side of said radiating signal means, and the collector of said one transistor connected through a condenser and said last diode to the base of said one transistor.

Claim 10

The fail-safe radiation detector and control sensor of claim 8 characterized by said controlled pulsating current consisting of a sixth transistor having its collector connected directly to one side of said radiating signal means and its base connected through a resistor to its collector and also connected through a diode to said other end of said primary winding of said second transformer and its emitter connected through a resistor to a diode of a first base of a third pair of transistors and a connection from said sixth transistor base through a resistor and condenser in parallel to ground and the collectors of said third pair to transistors which function as a multivibrator circuit to supply said radiating signal means.

Claim 11

The fail-safe radiation detector and control sensor of claim 4 characterized by said controlled pulsating current consisting of a sixth transistor having its collector connected directly to said other side of said radiating signal means and its base connected through a resistor to its collector and also connected through a diode to said other end of said primary winding of said second transformer and its emitter connected through a resistor to said diode means of the base of said third pair of transistors and a connection from said sixth transistor base through a resistor and condenser in parallel to ground and to the collectors of said third pair of transistors.

Claim 12

The fail-safe radiation detector and control sensor of claim 5 characterized by said resistor means including a sixth transistor having its collector connected directly to the other side of said radiating signal means and its base connected through a resistor to its collector and also connected through a diode to said other end of said primary winding of said second transformer and its emitter connected through a resistor to said diode of the base of said one of said third pair of transistors and a connection from said sixth transistor base through a resistor and a condenser in parallel to ground and the collectors of said third pair of transistors.

Claim 13

A fail-safe radiation detector and control sensor to register a signal of the proximity between relatively movable objects each having means to project a radiating signal comprising a radiation detector means having a defined field of view and mounted on one of such objects to receive and respond to said radiating signal from the other object when they are within a preselected range distance of each other, a pulsating radiating signal means effective on a sensor of a mobile object, a tubular housing pivotally mounted to be positioned at a preselected angle, first and second sensors enclosed in said housing and connected in series between positive voltage and ground to provide a lower positive voltage at their juncture, a partition in said housing having a vertical rectangular aperture to expose said first sensor to said radiation signal means from one end of said housing and said second sensor enclosed and subjected to the same ambient temperature to balance against each other so that their sensitivity remains constant over a wide range of temperature, a base of a first transistor connected to said sensor juncture, a voltage divider to apply voltage to the base of a second transistor, their respective collectors connected through their respective first and second resistors to positive voltage with a first condenser paralleling said first resistor and their emitters of said first and second transistors connected together and through a third resistor to ground to preset the bias voltage on the emitter of said first transistor to determine the point at which it conducts, a third transistor having its base connected to the collector of said first transistor and its emitter to positive voltage while its collector is connected through one end of the seventh and eighth resistors in series to ground, and a fourth transistor having its base connected to the juncture of said seventh and eighth resistors with its emitter to ground and its collector to pulse said radiation signal means effective on said first sensor.

Claim 14

A fail-safe radiation detector and control sensor to register a signal of the proximity between relatively movable objects each having means to project a radiating signal comprising a radiation detector means having a defined field of view and mounted on one of such objects to receive and respond to said radiating signal from the other object when they are within a preselected range distance of each other, a pulsating radiating signal means effective on a sensor of a mobile object, a tubular housing pivotally mounted to be positioned at a preselected angle, first and second sensors enclosed in said housing and connected in series between positive voltage and ground to provide a lower positive voltage at their juncture, a partition in said housing having a vertical rectangular aperture to expose said first sensor to said radiation signal means from one end of said housing and said second sensor enclosed and subjected to the same ambient temperature to balance against each other so that their sensitivity remains constant over a wide range of temperature, a base of a first transistor connected to said sensor juncture, a voltage divider to apply voltage to the base of a second transistor, their respective collectors connected through their respective first and second resistors to positive voltage with a first condenser paralleling said first resistor and their emitters of said first and second transistors connected together and through a third resistor to ground to preset the bias voltage on the emitter of said first transistor to determine the point at which it conducts, a third transistor having its base connected to the collector of said first transistor and its emitter to positive voltage while its collector is connected through one end of the seventh and eighth resistors in series to ground, and a fourth transistor having its base connected to the juncture of said seventh and eighth resistors with its emitter to ground and its collector to pulse said radiation signal means effective on said first sensor.