Matches 1 - 50 out of 111 1 2 3 >
Match Document Document Title
6778938 Fan speed detection in the presence of PWM speed control  
A circuit is arranged to pulse-width modulate the duty cycle of a power supply signal that is used to control the rotational speed of a fan in a temperature-controlled system. The control system...
6659895 Motion sensor for use with a bicycle sprocket assembly  
A sensor retainer for a bicycle sprocket assembly includes an annular member for mounting and rotating coaxially with the bicycle sprocket assembly and a sensor element fixed to the annular member....
6528987 Method and apparatus for determining fan speed  
An operating circuit ( 1 ) for controlling the speed of a cooling fan motor ( 3 ) for computer cabinetry ( 7 ), and for determining an under-speed condition in the fan motor ( 3 ) comprises a...
6101879 Rotation speed sensor  
In the present invention, a detection coil and a cancellation coil are closely provided and electrically connected in series to cancel induction noise. The cancellation coil may be disposed at a...
5606252 Circuit for mooting broken or chipped teeth of encoder wheels via comparing temporal fluctuations between rising or falling edges and using edge with least fluctuation  
A method and a device for detecting rotational speed with an inductive sensor in which a sinusoidal potential is induced by a magnet wheel and then fed to a filter with a comparator connected...
5511435 Apparatus for measuring vehicle running condition  
A battery-powered rotation detector detects passing of a rotating magnet attached to a vehicle wheel to generate and transmit a rotation signal. A receiver receives the rotation signal. A processor...
5424635 Shaft speed signal indicator  
A shaft speed signal indicator including a hub, bearing, switch assembly and housing which are mounted as a compact and integral unit to a free end of a revoluble shaft. The signal indicator...
5317258 Device for evaluating periodic signals from inductive pick-ups having a pulse former stage influenced as a function of the pick-up signal amplitude  
A device for evaluating periodic signals from inductive pick-ups compensates for the lag of the pick-up signal. This lag increases with increasing frequency as a consequence of the inductance of...
5138639 Pulse position measurement type meter-driving circuit capable of improving measurement accuracy  
A pulse control circuit generates latch signals in response to edges of externally-input pulses and generates a resetting signal after each of the latch signals is generated. A pulse position...
5008647 Wireless bicycle wheel monitor system  
A wireless data display system has a receiver/display unit tuned to the same frequency as a sensor/transmitter unit for monitoring wheel rotation for a vehicle such as a bicycle. The two units are...
4939455 Sensor having two-wire connection to load  
A sensor is connectable with a load circuit via two conductors. The sensor receives its electrical power from the load circuit via the two conductors and similarly provides its output signal...
4931966 Method of measuring vehicle speed  
In a method for measuring vehicle speed, initial vehicle speed measurement after a vehicle speed measurement power supply is turned on, is based on the predicted number of pulses to occur during a...
4841238 Gauge driving system  
An air-core gauge comprising two coils in quadrature has a driving system with switches on a junction terminal and end terminals of the two coils, and a drive circuit controlling the switches so...
4787072 Structure of electronic watch  
In an electronic watch, a sensor of the closed type which consists of an upper circular cover (10), a shell (20), a rotary turning disk (30), clamped between the upper cover and shell, the shell...
4769595 Pulse length indicator  
A pulse length indicator, for signaling when the length of a pulse from a cyclic signal source has exceeded a chosen duration, has a ramp signal generator, coupled to the cyclic signal source,...
4549163 Slip indicating system for a four-wheel drive vehicle  
Speed detectors are provided for detecting speeds of each of the four wheels of a vehicle. An electric circuit is provided to compare the speeds of all wheels and to turn on at least one lamp when...
4482859 Object displacement sensor and device for measuring the rotation speed and vibration frequency of a rotor  
An object displacement sensor specifically adapted for high speed counting of passing nonmagnetic objects is disclosed which has a resonant circuit made up of at least one inductive element 2 and a...
4470012 Apparatus for generating rate signals  
Apparatus operable by the player of a video or electronic game to generate pulses at a rate proportional to the speed of rotation of a rotatable member by closing one of a pair of switches...
4409548 Piezoelectric apparatus for generating electrically distinguishable bipolar signals  
This specification discloses an apparatus and method for providing electrically distinguishable signals occurring as a function of the position of a moving element. The electrical signals are...
4376915 Tachometer  
A tachometer comprises a magnet having north and south magnetic poles and a magnetically operated switch for sensing movement of the magnet and for producing an output signal in response thereto....
4352063 Self-calibrating speedometer/odometer  
A speedometer/odometer system for use on a bicycle which system uses a magnet/coil arrangement and a signal processing means for providing a count of the spokes of a wheel as they pass the...
4266192 Rotational speed detecting apparatus  
An apparatus for obtaining a signal relative to rotational speed of a rotary element is disclosed. The apparatus comprises a permanent magnet and a magnetic body which relatively approaches or...
4266147 Circuit arrangement for forming a speed-proportional output voltage from a speed-proportional pulse sequence  
Input variables are varied cyclically and sequentially in the same direction until the sign of the differential quotient of the magnitude of the error with respect to time changes.
4264905 Drive belt movement detecting system  
A belt movement sensor detects the movement of a belt having signal generating means embedded in or emplaced on the surface of a drive belt, and actuates a warning signal and/or controls the drive...
4262641 Combined RPM limiter, and electronic tachometer with shift point indicator  
A multi-function device using two ICs, with the precision ignition pulse frequency-to-voltage converted signal produced in the RPM portion being used as input to both ICs. Chatter pulses produced...
4246790 Combination speed transducer and speedometer cable  
A speedometer cable for a vehicle driven from the vehicle transmission has a speed transducer incorporated in the end fitting which attaches to the transmission housing. The speed transducer...
4197748 Distance-measuring apparatus  
Distance-measuring apparatus for attachment to a speedometer cable comprising a sensing assembly and a digital counter; the sensing assembly including a drum portion having a bore therethrough for...
4167734 Shaft speed and hot bearing indicating apparatus  
A shaft speed and hot bearing indicating apparatus is described having a transducer actuating means mounted on the shaft immediately adjacent the supporting bearing for actuating an electrical...
4156190 Electronic bicycle odometer and speedometer  
An electronic odometer and speedometer for bicycles computes distance and speed based upon input signals generated by interruption of a light beam by each spoke and the valve stem of a wheel of the...
4024473 Stroboscopic device  
An arrangement for use in indicating the speed of rotation of a body including a switch operated by elements which rotate according to the rotation of the body, a frequency generator which has an...
3936754 Device for detecting the opening of throttle valve of diesel engine for vehicle  
A device for detecting the opening of a throttle valve of a diesel engine for vehicles. The device comprises a magnetic shield adapted to be rotated responsive to the opening of the throttle valve,...
3887870 Pulse repetition rate meters  
A pulse repetition rate meter has a time base for generating a fixed plurality of auxiliary pulses in response to each pulse received of a train of pulses whose repetition rate is to be measured. A...
3875505 Data collection system and apparatus suitable for use therein  
A system for producing an indication of the number of occurrences of certain events, such as the traversal of miles by a vehicle, in which a single-pole double-throw reed switch is operated between...
3781677 VARIABLE RATE MEASURING DEVICE  
A variable rate measuring device is provided for accurately measuring the rate in which a series of input signals are provided. The device operates by means of an energy storage RC network which is...
3777121 ELECTRONIC COUNTER  
An electronic counter is provided with a built-in timer and is fabricated primarily of logic gates having a NAND function. Two of these gates are cross-connected in such a way that one of them is...
3771122 MOTOR VEHICLE AUTOMATIC HAZARD WARNING SYSTEM  
A motor vehicle automatic hazard warning system for automatically energizing the hazard warning flasher lights and horn at a predetermined speed. An operational amplifier responsive to a vehicle...
3701139 APPARATUS FOR DETECTING INTERRUPTION IN THE CYCLIC MOVEMENT OF A MEMBER  
A single-pole double-throw magnetic reed switch responds to the passage of one or more magnets on the periphery of a rotating air-to-air energy exchange wheel to signal through an interval timing...
3686507 PULSING MECHANISM  
An improved device for transforming shaft rotation into a predetermined number of electrical pulses per shaft revolution, with means to prevent the creation of spurious pulses at the electrical...
3678474 MARINE SPEEDOMETER AND ANEMOMETER WITH DIGITAL READOUT  
A marine speedometer and anemometer utilizing a common computer circuit and having an electro-luminescent display. A selector switch connects a pulse source and at the same time selects the proper...
3675126 COMMUTATED MOTOR SPEED MEASURING MEANS  
A device for measuring the speed of a commutated electric motor such as a d-c or universal motor uses a current transformer and band-pass filter for sensing power line perturbations caused by motor...
3672230 METHOD AND APPARATUS FOR TESTING PRODUCTION OF HIGH FREQUENCY CABLES  
The production of HF cables is supervised by indicating speed deviations from the desired cable speed. Cable speed is represented by a pulse source providing pulses leaving frequency proportionate...
3652937 SPEED AND FAULT INDICATOR FOR A MODEL VEHICLE  
A visual indicator is provided which monitors the operating conditions of a model track system having electrically propelled vehicles and simultaneously provides an indication of the speed of the...
3611343 RATE-MEASURING SYSTEM  
Rate-measuring system for measuring the velocity of rotation of a shaft, the rate of reciprocable movement of a part or for similar applications. A switch, preferably a magnetically operated reed...
3594845 PROGRAM CIRCUIT FOR AUTOMATIC BUFFING EQUIPMENT  
A program circuit for an automatic buffing system having a pulse generator for generating a sequence of signals which are keyed to the movement of a conveyor which carries the object to be buffed....
3546530 DIGITAL TACHOMETER CIRCUIT  
3541847 FLUID FLOW ANALYZING METHOD AND APPARATUS  
3433065 MARINE SPEEDOMETER AND ODOMETER  
3429182 FLUID FLOW METERS  
3417289 Speed sensing switch for rotary drums and the like  
3414770 Speed control apparatus  
Matches 1 - 50 out of 111 1 2 3 >