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7245085 |
Lamp fault detector
The continuity of a series-wired, lamp circuit is restored after interruption caused by failure of a lamp filament by providing a control relay that is wired in parallel with each lamp. A power...
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7221106 |
Cordset based appliance controller
An apparatus and method for distributed control of an electrical appliance having a plug and a load and two power carrying conductors connecting the plug to the load, comprising locating power...
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6326882 |
Apparatus and method for controlling a ventilation device
The invention provides a method and apparatus for controlling a ventilation device. When the power switch of a room is turned on, the light of the room is turned on and the fan of the room is also...
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6206538 |
Miser light for cordless battery operated hand tools
This invention provides a means to selectively, by single finger pressure of one hand on the operating switch of a cordless battery operated hand tool, turn the illumination of the work area on...
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6134094 |
Remotely controlled rotary switch for simulating multi-position, rotary, wafer-type, switches
The present invention employs rotary switches that can be electromechanically set or reset remotely. Typical, although not limiting, is the use of the switch of the present invention by a trainer...
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6031335 |
Electrical power control system for lighting systems
An electrical power system to provide a selected voltage to a load such as a fluorescent lighting system is characterized by a winding 3 having a positive end connected to a positive rail and is...
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5811892 |
Power supply system including mechanical output switches for use with a plurality of display tubes
A low voltage power inverter utilizes reed switches to control a number of display tubes. The reed switches are controlled by magnetic coils or permanent magnets. The magnetic coils receive a...
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5581134 |
Bypass switch for RF networks
A make-before-break bypass switch is combined with a pair of probes projecting from a support where a member is provided with sockets to slidably receive the probes. The probes define a gap in a...
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5554895 |
Electronic latching circuit for momentary contact switches
A switch circuit for activating and deactivating a motor vehicle cruise control includes a 555 model timer integrated circuit which has a trigger terminal, a reset terminal, a threshold terminal, a...
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5394018 |
Microprocessor based electrical apparatrus with false AC input rejection
False ac signals produced by a noise suppression capacitor across a switch applying a switched ac line voltage signal to a logic input of a microprocessor in an electrical apparatus such as, for...
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5087825 |
Capacity responsive keyboard
A capacity responsive keyboard which eliminates the necessity for metal films on the touch surface includes an insulated substrate having a plurality of electrically conductive plate members...
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4945256 |
Device for producing even closing of a circuit breaker
A circuit breaker for opening and closing contacts disposed on each phase of a multiphase electric power line has a photo-diode array and a light emitting diode array disposed on opposite sides of...
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4939618 |
Lightning protected electric fence controller system and method
An electric fence controller (20) interconnected to electric fence terminals (136, 138) by a three terminal spark gap arrangement (140) one terminal (142) being interconnected to the fence hot...
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4907122 |
Relay circuit having a pulse generator for closing contacts
In a relay circuit, a stationary contact of a relay is coupled to a DC voltage source and a moving contact of the relay is coupled to a load circuit. The moving contact is switched to the...
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4901192 |
Electrical circuit for driving a load with a large force applied intermittently
An electrical circuit is employed for receiving current from a small battery and converting it into a large intermittent force which will move a heavy load. In the example shown the load is a clock...
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4859868 |
Electric fence energizer
This invention relates to an electric fence energizer, including: two or more transformers, the primary windings of said transformers being connected to the main circuitry of the energizer and the...
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4859819 |
Staged opening switch
A staged switch for conducting a large electrical current for an indefinite time period and then rapidly switching the current into a load circuit. The switch comprises a first stage which can...
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4841165 |
D. C. power controller
A DC power controller for controlling the rate at which direct current is furnished to a load. A signal generator provides a periodic signal having a first value during a first portion of each...
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4709615 |
Electrical firing systems
An electrical firing arrangement for the sequential firing of a plurality of mortars stacked in end-to-end relationship within a single launching barrel. The firing arrangement comprises a pulse...
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4710645 |
Device for monitoring the state of an electric switch or an electric relay
A device for monitoring the state of a relay comprises an electrical insulation transformer whose secondary winding is connected, through a rectifier, to the output terminals of the relay. The...
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4695739 |
Multi-function switch-controlled lamp circuit
A multi-function circuit controller provides auxiliary control functions for an existing single-pole, single-throw toggle switch by counting the number of changes of state of the switch that occur...
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4678926 |
Christmas tree lighting control
This invention relates generally to ornamental lighting controls and particularly to a lighting control for Christmas tree lighting having preferably at least four duty cycle outputs and wherein...
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4672232 |
Microprocessor operated timing controller
The timing controller includes a triac, a receptacle, and an AC wall outlet coupled in series. A sensor is coupled across the receptacle to sense when a lamp plugged therein is turned on or off. A...
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4658154 |
Piezoelectric relay switching circuit
To control the operation of a piezoelectric relay, control circuitry is disclosed for direct ohmic connection to a utility AC source to draw the minimal power required to actuate the relay's...
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4626699 |
Pulse generator
An electromechanical pulse generator includes a toothed disk driven by a rotating shaft to operate two pairs of contacts to generate one pulse output and one direction-of-rotation output. The pulse...
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4591731 |
Circuit for controlling the stopping of equipment
The circuit for controlling the stopping of equipment comprises a switch with two contacts and with a pushbutton able to bring about the switching of the contacts into an open position and a closed...
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4555640 |
Automatic high insulation switch
Automatic high insulation switch with low consumption level and small overall dimensions. The switch is associated with an apparatus for measuring very low currents (10 -7 to 10 -14 amperes)...
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4409493 |
Method and device for the transmission of electric power between parts turning at low speed
Device and method for transmission of electric power between two parts turning at low relative speed. A flexible electrical conductor connects an intermediate part to the turning. A driving device...
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4394583 |
Electric fence energizers
An electric fence energizer which comprises a capacitor connected across a power supply to an output transformer. An SCR is provided between the capacitor and the primary stage of the transformer...
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4367416 |
Random electric timer having a reversible motor
A random timer including a reversible electric drive motor, an output means, and a power circuit connecting a power supply to the drive motor and output means and where two dissimilar cam type...
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4219741 |
Random timer apparatus
A random timer including a drive motor, an output means, and a power circuit connecting a power supply to the drive motor and output means and where two dissimilar timing elements are controlled by...
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4215277 |
Sequencing light controller
A controller for sequentially energizing a plurality of lights, such as commercial display lighting or Christmas tree light strings, includes a plurality of outlet receptacles into which the lights...
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4200809 |
Apparatus for generating electric shock pulses
An apparatus for generating electric pulses is disclosed. The apparatus comprises a generator or oscillator for charging a storage capacitor and a control circuit for controlling the discharge of...
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4173721 |
Window shade controls and method associated therewith
A method and device according to which it becomes possible to operate a window shade automatically. Thus, by way of this method and device a window shade can be automatically closed during the...
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4084103 |
System-state and operating condition sensitive control method and apparatus for electric power delivery systems
This invention provides a method and apparatus for determining a precise switching sequence for the power switching elements of electric power delivery systems of the on-off switching type and...
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3988594 |
Electric fences
An electric fence controller for controlling the charge on an electrified fence. A charging circuit is provided which includes a ferro-resonant input transformer. The transformer is provided with...
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3898553 |
Circuit for supplying power to a load
A circuit which periodically switches a load between its "off" (non-conducting) and "on" (conducting) states. The duration of each state is controllable, with states having periods in excess of one...
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3873847 |
Control system for an electrified fence
An automatic as well as manually operated switching system for selectively applying relatively high voltage pulses to an electrified fence from one of a pair of fence charger units commonly...
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3772529 |
PROGRAMMABLE UNIJUNCTION FENCE CHARGER
A portable fence charger which comprises a relaxation oscillator having a programmable unijunction transistor for producing repetitive pulses, circuitry for amplifying and applying said pulses to a...
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3676759 |
ON-OFF MOTOR CONTROL PUSH BUTTON SWITCH FOR PHOTOGRAPHIC APPARATUS
Pressing a release turns on, or triggers, a bistable electronic switch, such as a multivibrator or a semiconductor tetrode, which in turn renders an amplifying transistor conductive through which...
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3655994 |
ELECTRIC FENCE CHARGER
A device for periodically applying a high potential on an electric fence has means for applying such potential for very short times at periodic intervals. The time between successive charging...
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3655995 |
AUTOMATIC ELECTRIC FENCE CHARGING SYSTEM
A fence charging system includes a sensing circuit connected to a fence to be charged. The sensing circuit applies a harmless low voltage which normally maintains a fence charger below operating...
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3617815 |
IMPEDANCE SWITCHING TIMER
The timing circuit is connected in series relation with the coil of a contactor and the same includes a charging circuit and a conducting circuit. A resistor of high ohmic value and a series...
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3581299 |
ELECTRIC FENCE CHARGER HAVING GROUND DETECTOR
An electric fence charger that is energized from a utility power supply wherein one utility supply line is grounded, said charger having a circuit to provide, in respect to a separate ground...
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3571610 |
GENERAL PURPOSE FLASHER DEVICE FOR AUTOMOTIVE USE
This is an RC coil circuit which can be used as an alternator, a hazard-warning flasher, a turn signal flasher and a buzzer depending on the switch activated.
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3569727 |
CONTROL MEANS FOR PULSE GENERATING APPARATUS
A condenser discharge type electrical pulse generating circuit, such as for a combustion engine ignition system, in combination with means for automatically disabling said circuit after operation...
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3567956 |
AUTOMATIC DECELERATION WARNING SWITCH
The subject invention relates to a switching device which will be activated by the sudden release of an automotive accelerator pedal. A pendulum arm is secured to the accelerator linkage and will...
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3562603 |
MAGNETIC REED PROXIMITY DETECTOR
This device detects the proximity of magnetic objects, and comprises a permanent magnet associated with a spaced reed relay which has its contact normally held in an actuated position by the flux...
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3562599 |
CYCLING DELAY CIRCUIT TESTING DEVICE
A voltage cycling testing device for a delay circuit. A unijunction relaxon oscillator delivers a trigger pulse to a monostable multivibrator which activates a relay to apply power to a circuit...
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3546479 |
LONG PERIOD ELECTRONIC TIMER FOR AEROSOL DISPENSER OR THE LIKE
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