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A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 5101317 | Overload protector for telecommunications systems An overload protector for a telecommunications system with an overcurrent protection device for each signal line in a chamber formed between a housing and a base and in which the base carries the line and ground pins and also an overvoltage device for eac... | 03/31/1992 |
| 5051859 | Current-limiting load cutout A current-limiting load cutout includes at least one contact pair (1, 2) with one contact (3, 5) rigidly linked to electrodynamic current limiter (9, 10) that is electrically connected to controllable pulse current supply (17), and at least one emergency ... | 09/24/1991 |
| 5038246 | Fault powered, processor controlled circuit breaker trip system having reliable tripping operation A fault-powered, processor-based tripping system includes a solenoid for interrupting a current path in response to a trip signal generated by a processor. The processor analyzes current provided by a current sensor, by way of an interface circuit, to det... | 08/06/1991 |
| 5036420 | Surge absorber A surge absorber utilizes a varistor electrically connected to a surge absorbing element. The varistor voltage and nonlinearity factor are chosen so that the varistor has a preselected voltage-current characteristic which prevents the varistor from breaki... | 07/30/1991 |
| 5034621 | Inductive proximity switch exhibiting magnetic field immunity A proximity switch assembly (10) for signaling the location of a movable member (36) at either of opposite end limits of movement relative to a stationary frame (44, 46) includes a compact elongate housing (58) adapted to be mounted on the frame to extend... | 07/23/1991 |
| 5034846 | Plug protector A terminal connector or plug protector is selectively configurable for coupling or coupling and protecting an electronic communication circuit to a communication line. The plug protector has a housing and a circuit board which is received in the housing. ... | 07/23/1991 |
| 5032946 | Electrical surge suppressor and dual indicator apparatus Surge suppression is provided by varistors connected between, respectively, hot and neutral conductors and hot and ground conductors, each through a common fuse that avoids hazardous overvoltages on the varistors. A first indicator circuit portion provide... | 07/16/1991 |
| 5028807 | Load cell with base plate A load cell includes a load sensing section which is formed by a rigid load introduction section, a rigid load support section and a strain sensing section, and a base plate having a neck and two parallel plate-shaped rigid sections. One part of the plate... | 07/02/1991 |
| 5029039 | Current adaptive fault indicator A fault indicator which senses current in a cable, resets in response to a minimum current and arms a trip arrangement in response to current rising a predetermined amount with respect to time. If the rising current also opens a circuit breaker within a p... | 07/02/1991 |
| 5023744 | Temperature switching device A temperature switching device for an electrotechnical part to be protected against an excess temperature due to a fault, with a first bimetallic switch and an ohmic resistor connected in parallel thereto, so that, after opening the bimetallic switch as a... | 06/11/1991 |
| 5023746 | Suppression of transients by current sharing A multiple element current sharing surge voltage protector is connected in parallel between a voltage source and the input of an electrical load. The protective network includes a low pass shunt capacitor filter, a first suppressor having a selenium varis... | 06/11/1991 |
| 5023747 | Meter base surge suppresion system A meter base surge suppression system is mountable on a meter mounting panel and is adapted to receive and hold a conventional electric meter. The surge suppression system includes a base plate having a plurality of openings through which contact prongs m... | 06/11/1991 |
| 5023468 | Safety device for car passengers A safety device for a vehicle occupant comprising a restraint for the vehicle occupant, a sensing circuit for evaluating a vehicle condition, a control circuit for actuating the restraint in response to a predetermined vehicle condition, and two separate ... | 06/11/1991 |
| 5023743 | Device for protecting a delay-line modulator A device for protecting delay-line modulators of this type by detecting turn-off of the discharge thyristor by a comparator so as to prevent closing of the charge thyristor as long as the discharge thyristor is in the conducting state. This has the effect... | 06/11/1991 |
| 5023470 | Electronic flash charging circuit An electronic flash charging circuit for use with a camera having a power source common to a microcomputer that controls a plurality of camera functions and to an electronic flash. The charging circuit has a booster circuit for boosting a charging voltage... | 06/11/1991 |
| 5021914 | Superconducting switch and current limiter using such a switch There is disclosed a superconducting switch including two superconducting coils wound on a common bobbin wherein these coils have the same critical current value, and are connected in parallel so that magnetomotive forces which are the same in magnitude a... | 06/04/1991 |
| 5018042 | Tingle voltage filter A tingle voltage filter, comprising a saturating reactor connected between the neutral and the local bonding to ground of an electrical service so as to reduce ground currents, is associated with a device to determine whether the potential, referred to a ... | 05/21/1991 |
| 5016133 | Apparatus for flicker protection when a servo-motor starts An apparatus for flicker protection when a servo motor driven sewing machine starts utilizing comparators. Setting the original voltage as the reference voltage and the dropped voltage as the monitor voltage, the comparator compares the voltages and, if t... | 05/14/1991 |
| 5014153 | Transformer differential relay An apparatus for monitoring phased currents in a first winding and a second winding of a transformer and for disconnecting the transformer from a power source supplying the transformer when a difference between the magnitude of the current in the first wi... | 05/07/1991 |
| 5008771 | Diagnostic circuit for units providing current control and protection against excessive heat dissipation for semiconductor power devices The diagnostic circuit comprises a comparator having a first input connected to the power device and a second input connected to a reference voltage generator. A signal generator is connected to the output of comparator so as to generate a diagnostic sign... | 04/16/1991 |
| 5003426 | Faulted current indicators and inrush restraints therefor A faulted circuit indicator includes an inrush restraint circuit that suppresses a trip signal when an inrush current rises from below a minimum value to a trip value within a predetermined time and then drops again to another value such as the trip value... | 03/26/1991 |
| 5001587 | Protection circuit for railroad signaling high voltage surge protection circuit A surge suppressor suitable for protecting railroad switching systems from lightning directly striking a rail of a railroad track includes a pair of spark gap surge suppressors each coupled between a ground conductor and a corresponding rail. A spark gap ... | 03/19/1991 |
| 4996624 | Fault location method for radial transmission and distribution systems A method of locating a phase-to-ground fault in a radial distribution system with a tapped load. The method includes determining the positive-sequence impedance from the residual current, the residual current compensation factor and the phase-to-ground vo... | 02/26/1991 |
| 4994933 | Ground fault circuit interrupter having loss of neutral or loss of ground protection A ground fault circuit interrupter is described which provides protection in the event of loss of neutral or ground, excess potential between neutral and ground and reversed input connections. Separate, independent tripping circuits are used for these lat... | 02/19/1991 |
| 4992904 | Hybrid contactor for DC airframe power supply A contactor (12) for controlling connection of a DC power supply to an electrical load (14) in includes a series circuit (19) disposed between a nonground DC potential and a load having first (20) and second (22) relays each having a pair of contacts (26)... | 02/12/1991 |
| 4991052 | Differential protective relay apparatus An apparatus for differential-protection of a bus bar having a plurality of terminals which includes a plurality of trunk lines, in which an impedance of a differential circuit connected in parallel to a current transformer provided in each of the termina... | 02/05/1991 |
| 4985599 | Transformer bushing cap A bushing cap is provided for mounting to a transformer bushing or to a lightening arrestor. The bushing cap when mounted to the bushing acts as an umbrella for the bushing to protect the same from airborne contaminates such as salt spray which can form a... | 01/15/1991 |
| 4984124 | Faulted current indicator with inrush restraint The disclosed faulted current indicator senses current in a line having a breaker or fuse, and avoids tripping in response to current inrush signals by producing a trip signal in response to an overcurrent occurring for an overcurrent duration which is in... | 01/08/1991 |
| 4984125 | Arrester apparatus In a gas-filled arrester, a pair of main electrodes and a ground electrode are air-tightly fitted to an insulating tubular member. A springy, electrically-conductive short-circuiting element having an arcuate shape is fitted around the outer wall of the g... | 01/08/1991 |
| 4982306 | Method of limiting starting current in a DC converter and device for performing the method In a method and device for limiting the starting current of a DC converter, at least one buffer capacitor is initially charged through a load resistor. The current going through the load resistor is measured with a monitor. The monitor switches on a DC co... | 01/01/1991 |
| 4982307 | Thermal protection circuit for an integrated circuit subscriber line interface A thermal protection circuit for an integrated circuit subscriber line interface is disclosed. The thermal protection circuit monitors the temperature of the integrated circuit and develops an output voltage signal that shuts-down the integrated circuit w... | 01/01/1991 |
| 4980790 | Fault indicating means The reset circuit of a fault indicator is coupled to a transformer secondary winding by a cable having an elongated conductor and a resistance close to the secondary winding. The resistance is capable of withstanding a minimum transient impulse of 10 kv.... | 12/25/1990 |
| 4979071 | Protection circuit for a semiconductor circuit A protection circuit for a semiconductor circuit for protecting it from a thunder surge and overcurrent or overvoltage. A surge absorbing element and a Zenor diode are in parallel connected to the semiconductor circuit. A first fuse are connected before b... | 12/18/1990 |
| 4979072 | Lamp output protective circuit in electronic controller A lamp output protective circuit for an electronic controller having a first npn transistor connected to an output terminal through which a lamp is supplied with electric power, a resistor connected between the emitter of said first npn transistor and the... | 12/18/1990 |
| 4977477 | Short-circuit protected switched output circuit A short-circuit protected switched output circuit having: an input node (I10) for receiving an input switching signal; an output node (O10) for outputting a switched output signal; switch means (Q10) connected between the input and output nodes; and a Sch... | 12/11/1990 |
| 4977332 | Power switching apparatus A power switching apparatus is provided with a plurality of power switching elements in which each power switching element is configured to receive an input signal, a carry-in signal and two partial duty cycle signals. The power switching element is also ... | 12/11/1990 |
| 4975797 | Arrester with external isolator An arrester for an under oil transformer is connected between a primary bushing lead and an insulator/isolator penetrating the wall of a housing which encloses the oil, arrester, and transformer parts. A ground wire outside the housing is removably connec... | 12/04/1990 |
| 4975796 | Reverse discharge diode capacitor A device which enables a self-healing capacitor with more than one group of sections in series to undergo repetitive clearing without generating the resulting potential differences between the series sections which causes additional failures. In one embod... | 12/04/1990 |
| 4975798 | Voltage-clamped integrated circuit An automobile alternator regulator integrated circuit having a voltage-supply or -sense node (6) for connection to an external voltage, and a voltage clamp comprising: a pnp bypass transistor (Q1) having a base electrode, an emitter electrode coupled to t... | 12/04/1990 |
| 4972292 | Inductor with centertap switching transistor for reduced radio frequency emissions There is disclosed herein a modular, high power, flyback transformer based power supply with step up and step down capability. The power supply uses multiple flyback transformers having switching transistors which may be either connected to one terminal o... | 11/20/1990 |
