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8842010 Method for alerting physical approach  
A method and apparatus is described to detect the physical approach. The method is useful for passively detecting the presence of people, pets, or robots in proximity to a sensor. It is portable,...
8786482 Integrated circuit with pin for setting digital address  
In one embodiment, an integrated circuit includes a pin and a current source for driving current through the pin into an external resistor such as a resistor on a circuit board to generate a pin...
8699200 Secure non-contact switch  
A redundant non-contact switch reports a status as closed or open for a first member and a second member that move relative to each other between an open state and a closed state. In some...
8624751 Capacitive proximity alarm circuit and system  
An alarm system for emitting an alarm includes a distance detecting circuit, a gate circuit, a voltage conversion circuit, a distance judging circuit and an alarm circuit. The distance detecting...
8456792 Secure non-contact switch  
A redundant non-contact switch reports a status as closed or open for a first member and a second member that move relative to each other between an open state and a closed state. In some...
8009045 Method for alerting physical approach  
A method and apparatus is described to detect the physical approach. The method is useful for passively detecting the presence of people, pets, or robots in proximity to a sensor. It is portable,...
7932643 Lighting control system  
A lighting control system comprises a plurality of toggle switches, a plurality of pushbuttons, a plurality of timer circuits, a plurality of relays, and a plurality of photocells to control a...
7932644 Safety switch  
A safety switch configured to determine whether a magnetically operated switch which forms part of the safety switch has been welded closed. The safety switch is configured to establish a first...
7663492 Method and means for controlling the operation of a machine based upon the wearing of a sensor by a machine operator  
A method and means for controlling the operation of a machine by an operator having a transmitter mounted to a machine, a sensor attached to an operator or an operator's clothing, and a tracking...
7459910 Contact welding detecting device for relay  
A contact welding detecting device includes: a relay including a first contact for permitting and breaking transmission of a first DC input potential to a first output and a second contact for...
7365955 Material processing machine  
A material processing machine such as a wood chipping machine, a press, a cane cutting machine or other machine comprising an operating region having at least one processing element and an access...
7218498 Touch switch with integral control circuit  
A touch switch apparatus for detecting the presence of an object such as a human appendage, the apparatus having a touch pad, an electric field generated about the touch pad and also having a...
7202796 Device and method for triggering a sensor for cables  
In order to provide a triggering signal for a cable stripping device that is also capable of dealing with very thin wires, it is suggested to use a piezoelectric sensor, the output signal from...
7193833 Electric switch  
An electric switch (1) comprising a capacity sensor circuit (2) provided with a signal input (3) arranged to be connected to an actuating line, and which is provided with a relay device (4)...
7177132 Method and apparatus for determining a switching signal state  
A technique for controlling a switching circuit includes one or more sensing circuits that generate signals based upon the presence of an actuating object and upon a randomly applied strobe...
7082023 Method and circuit arrangement for function monitoring of an electronic-mechanical position switch  
In a method for function monitoring of an electronic-mechanical position switch in which the wiper voltage of a potentiometer acted upon by an actuation tappet is evaluated in comparison to a...
7076381 Adaptive proximity sensing  
Some embodiments provide a sensor element, a shield element capacitively coupled to the sensor element and to ground, a coupling circuit to receive an input signal, and to electrically couple the...
6900728 System to detect user entry into a defined danger zone  
A system and method for detecting user entry into a defined danger zone surrounding a saw blade includes a non-conducting member defining an opening therein for receiving a saw blade. The...
6885365 Glass touch sensing circuit  
A glass touch sensing circuit which is capable of accurately detecting a sense signal resulting from a user's touch under no influence of variations in temperature. The glass touch sensing circuit...
6744391 System for sampling a signal in an electronic instrument using a unipolar A/D converter  
The system includes a unipolar A/D converter, which samples analog signal inputs thereto, the A/D converter being used in a protective relay for electric power systems. The unipolar A/D converter...
6717514 Alarm system and method  
An alarm system and method is provided for preventing injuries as may occur within a manufacturing plant using lathes, milling equipment, metal shears and other machinery. The alarm system is so...
6683778 Device for use in electric vehicles for detecting adhesion in relay due to melting  
A relay adhesion detecting device (10) of the invention is installed in an electric motor vehicle wherein a relay (14) is provided between a power source unit (12) comprising a plurality of...
6664661 Proximity switch  
A proximity switch is described, specifically a capacitive proximity switch, with two signal transmitters (1, 2) and with one signal receiver (3), a first signal output (4, 5) of each of the two...
6647133 Fingerprint identification device-equip with a touch sensor for detecting a human finger  
A fingerprint identification device judges that the input fingerprint is identical to the fingerprint in the database only when a the touch sensor detects the human finger and a the fingerprint...
6452501 Automatic shut-off and indication device for an electric heating appliance and electric pressing iron comprising such a device  
An automatic shut-off and indication device for an electric heating appliance is provided which includes: a sensor (2) for sensing usage of the appliance and for providing a usage-signal (US)...
6442013 Apparatus having capacitive sensor  
An electronic device (1), e.g. a mobile telephone having a front cover (6) and a capacitive proximity sensor, comprising: a first electrode (9; 27) and a second electrode (8; 21, 20), said first...
6418004 Safety system utilizing a passive sensor to detect the presence of a hand of a worker and provide a signal to interrupt the operation of a machine  
A safety system for a machine such as a wood chipping machine. The safety system has a passive sensor that may be worn on the machine operator's wrist, a sensing coil mounted to a feed chute of...
6366442 Vehicular input device including single manual operating unit for operating various electronic devices mounted on vehicle  
A vehicular input device is disclosed which can afford a high stability of movable portions and an excellent power saving characteristic without impairing the operability of a manual operating...
6335855 Battery powered programmable remote switch controller  
A battery powered radio programmable remote switch controller and a separate hand held programming unit (programmer) designed to conserve the life of the life of the controller batteries using a...
6281803 Control mat monitoring and warning apparatus and method  
A control mat monitoring and warning apparatus and method in which the resistance of a control mat is monitored continuously while the mat remains in use. Deviations of the pattern of control mat...
6274829 Wireless inductive coupled switch  
A device is provided for allowing detection of a switch closure across an air gap between components. The device comprises a wireless inductive coupled switch designed for use with any suitable...
6212052 Contactless safety switch  
The invention relates to a contactless safety switch for detecting the shut position of a shutting part in relation to a closeable part, with a switch unit, supplied with current by an electrical...
6176207 Electronically controlling the landing of an armature in an electromechanical actuator  
Sensing magnetic flux in an electromechanical actuator having dual axially opposed stators and dual springs, a control system modifies the rise of flux in such a manner to produce a substantially...
6160322 Pulse signal generation method and apparatus  
A pulse signal generator comprises a magnetic element capable of causing a large Barkhausen jump, a detector provided in relation to the magnetic element, a magnetic field source provided in the...
6130489 Inductive proximity switch  
An inductive proximity switch includes a coil that is supplied with periodic transmitting current pulses. Signals which correspond to voltages induced in the coil after the end of a transmitting...
6115229 Apparatus for identifying the position of an element, in particular a lock bolt of a motor vehicle lock, which can be moved between two end positions, and a method of driving the apparatus  
In order to identify the position of a movable element, such as a lock bolt, a resonant circuit is subjected to the element or a part that moves with the element. The resonant circuit is thereby...
6104100 Charge transfer load sensor  
A charge transfer load sensor. A first and second electrode are disposed a fixed distance apart, and a third electrode is disposed between the first and second electrodes. The third electrode is...
6060796 Protective circuit  
The invention concerns a protective circuit for monitoring an object which can move between two end positions, for example a displaceable safety door (1) of an electric machine. This type of...
6029578 Method and device for starting a machine  
A method and a device for starting a machine, in particular, a printing press, using a sensor or sensor field which emits a start signal during the approach of a part of the body of a machine...
5991142 Detection of ophthalmic surgical handpiece by injecting current signal  
An apparatus to detect the presence of a surgical handpiece is provided. The handpiece is electrically isolated from its source of electric power by a transformer having two primary windings and...
5984513 Very low current microcontroller operated motion sensor  
A multivoltage (120 VAC to 277 VAC) input, low leakage current type, microcontroller-based, wall switch mounted, IR motion sensor with a latching relay having zero watt load switching capability,...
5923101 Non-contact key  
A non-contact switch movs from an off position to an on position when a lossy material enters a sensitive area of the switch. The non-contact switch comprises a transmitting element and a sensing...
5844204 Device for detection of electric current by micro-leakage  
A detection device associated with an electrical apparatus for detecting by contact the presence of a user, composed of an electronic circuit for detecting a presence of a user by detecting a...
5818681 Electromagnetic relay drive circuit  
The invention relates to an electromagnetic relay drive circuit which generates an electromagnetic relay excitation signal after first verifying that the electromagnetic relay make contact points...
5818129 Non-contact proximity switch and method for programming it  
In order to improve a non-contact proximity switch, and a method for programming it, with an resonant circuit that can be influenced by objects approaching from outside and an evaluation circuit...
5812356 Computer docking system having an electromagnetic lock  
A method and apparatus for electromechanically locking a docking station to a computer using an electromagnetic attractive force is disclosed. In a preferred embodiment, the docking station...
5796341 Safety and security system for work area  
A safety device and an alarm system controller of a workspace providing bidirectional communication for determining whether the required safety devices are used by the work persons entering the...
5716129 Proximity switch for lighting devices  
A proximity switch for controlling lighting devices includes an oscillator operating at a nominal frequency. When a hand is positioned near a sensing antenna, the frequency of the oscillator...
5666010 Safety system for machine tools  
A safety device and a supply power controller of a machine tool providing bidirectional communication for determining whether the safety device is appropriate for the particular machine tool, and...
5554973 Electrostatic capacitance-type sensor  
A proximity sensor of the electrostatic type has a pulse-generating circuit and first and second delay circuits which are respectively connected to an output of the pulse-generating circuit. The...

Matches 1 - 50 out of 217 1 2 3 4 5 >