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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 |
| 7511933 | System and method for protecting transient-suppressing elements against over-voltage conditions An over-voltage protection system including a phase bus connected to a phase conductor of an electrical system and one or more transient-suppressing lines connected to the phase bus. Each of the transient-suppressing lines includes a contactor and a transient-suppre... | 03/31/2009 |
| 7439639 | Safety switching apparatus for safe disconnection of an electrical load A safety switching apparatus for safe disconnection of an electrical load has at least one input for connecting a signaling device. The safety switching apparatus further has an evaluation and control unit and at least one switching element which can be controlled b... | 10/21/2008 |
| 7365451 | Power converter A power converter that can continue to operate after suffering a partial failure. The power converter includes multiple array transformers; normally-on switches connected respectively in series with the ends of each of the primary windings of the array transformers;... | 04/29/2008 |
| 7336165 | Retrofitting detectors into legacy detector systems The disclosure includes improvements in the field of retrofit-detector installation such as adapters that simplify retrofit of addressable detectors onto previously installed zone-type system hardware. Each adapter includes electrical circuitry for electrically conn... | 02/26/2008 |
| 7336461 | Method for determining the moment of closure of a circuit breaker on a high voltage line A method for determining the reclose time of a circuit breaker on a three-phase high-voltage electric network after separation of contacts 7A, 8A, 7B, 8B, 7C, 8C in the presence of a fault on one of the three phases A, B or ... | 02/26/2008 |
| 7321981 | Multi-port line card redundancy technique for an intermediate network node A multi-port line card redundancy technique automatically reconfigures ports on line cards of an intermediate network node, such as an aggregation router, in the event of a failure to one of the ports. The technique includes a circuit that automatically enables one ... | 01/22/2008 |
| 7291940 | Pressure sensitive switches including touch sensor structures An electronic circuit for use with an exhaustible power source and at least one load such as a light bulb, a radio or motor, includes a microchip with an input that transmits a signal to the microchip when the load is activated or deactivated. The input does not for... | 11/06/2007 |
| 7292528 | Method and apparatus to facilitate independent protection switching in a distributed network A method and apparatus to establish independence between nodes in a distributed network during protection switching. A translation module that may include a cross connect table is introduced onto a backplane of a line card between a switch fabric and an egress time ... | 11/06/2007 |
| 7292011 | Electrical protection of a generator controller A generator system includes a generator control for providing electrical power to a main generator. The main generator is mechanically coupled to an electrical power source that provides electrical power to the generator control during operation of the main generato... | 11/06/2007 |
| 7279905 | Method and an apparatus for supervising the operation of current transformers A method of supervising the operation of a plurality of current transformers arranged in respective groups and connected to a protection relay forming part of a three-phase electrical power system includes determining a current ratio at an output of each group of cu... | 10/09/2007 |
| 7266758 | Network monitoring program, network monitoring method, and network monitoring apparatus A network monitoring program automatically sorts fault producing locations on a network. A memory unit stores a fault location determining table containing events indicative of failures of communications via the network, the events being associated with classified e... | 09/04/2007 |
| 7266841 | Security and communications module The invention provides a module for use in a central service provider interface having access to security system and voice and data communications. The module is configured to allow the security system to seize the telephone line when necessary to indicate a securit... | 09/04/2007 |
| 7170730 | Multiple suite audio line isolator A method for isolating suites includes the steps of isolating the suites when an alarm is initiated, setting a timer during isolation creating a window of time to clear a short circuit, clearing said short circuit, removing isolation from the suites as the timer rea... | 01/30/2007 |
| 7158012 | Non-invasive powerline communications system A non-invasive powerline communications system includes: means for generating communication signals at a first location for transmission on a powerline; means for reactively coupling the communication signals to the powerline; and means for receiving said communicat... | 01/02/2007 |
| 7154722 | Loop control for distribution systems The invention contemplates a technique for providing loop control on a faulted overhead or underground loop system, while preventing restored current from being fed or back fed into the fault. In particular, the invention provides a method, device, and system for re... | 12/26/2006 |
| 7154884 | Stackplane architecture A scalable multi-service node system uses a stackplane architecture which allows the transport capacity to be flexibly expanded while providing first traffic mode and second traffic mode link channels. The primary channel bank is provided, and one or more secondary ... | 12/26/2006 |
| 7119459 | Intelligent switch for connecting power to a load A switching circuit includes a microchip which, in response to a signal from a signal switch, controls the operation of a power switch which, when closed, connects a load to a battery. The microchip can monitor the status of the battery and control the power switch ... | 10/10/2006 |
| 7110231 | Adaptive protection system for a power-distribution network A preferred embodiment of a system comprises a recloser electrically coupled to a voltage source of a power-distribution network and adapted to isolate a section of a distribution feeder of the power-distribution network from the voltage source in response to an ove... | 09/19/2006 |
| 7068483 | Circuit breaker lockout A circuit breaker lockout device is provided that prevents the breaker contacts from being closed when the circuit breaker is in a lockout state in response to a lockout signal and permits the breaker contacts to be closed when the circuit breaker is an enable state... | 06/27/2006 |
| 7039732 | Method and apparatus for providing redundancy between card elements in a chassis According to one embodiment of the invention, a method for providing redundancy for a card in a chassis includes providing first and second cards in a chassis. Each card has an output node connected to a common bus and a respective input node. The method also includ... | 05/02/2006 |
| 7038897 | Arc fault detection system A system and method for an arc fault detection system for aircraft wiring system is disclosed. Upon detection of arc fault events, the system transmits a signal that may be sent to an existing circuitry of the aircraft electrical system, which disconnects the power ... | 05/02/2006 |
| 7035065 | Electrical ground isolation and secondary failure reduction detection and isolation A system for isolating electrical ground faults and secondary failures in an electrical system, the system comprising an AC ground isolation state machine for detecting and isolating an AC ground, a DC ground isolation state machine for detecting and isolating a DC ... | 04/25/2006 |
| 6975587 | Mechanism for automatic protection switching in a router In a router, externally received messages addressed to an active line card are bridged to a protection line card. Each line card in the router is programmed to respond to such externally received messages by directing them to the protection line card associated with... | 12/13/2005 |
| 6922318 | Ground relay system in a multiplex direct grounding system A ground relay system is provided which includes: first current transformers located in the respective phases of a sending end of a high-voltage distribution provided from a distribution substation; over-current relays connected to the first transformers; distributi... | 07/26/2005 |
| 6904549 | Method for fault identification in an electrical radial network, an application of the method and an arrangement for fault identification in an electrical radial network A Device for fault identification in an electrical radial network has a section cable and a number of outgoers which can be connected thereto. The device provides that a central control device uses fault direction signals and/or fault signals which are formed by out... | 06/07/2005 |
| 6842319 | Procedure for producing an initiation signal after the current differential protection principle arrangement The invention relates to a method and arrangement for generating a trigger signal according to the current differential protection principle when a fault occurs on a section of an electrical power supply system, in which differential current values and stabilization... | 01/11/2005 |
| 6826027 | Audio line isolator A method for isolating suites includes the steps of isolating the suites when an alarm is initiated, setting a timer during isolation creating a window of time to clear a short circuit, clearing said short circuit, removing isolation from the suites as the timer rea... | 11/30/2004 |
| 6650969 | Electrical fault protection system A fault protection system whose trip logic considers power magnitude and direction at first and second points on a conductor is provided. Under normal operating conditions, power flows in the same direction through first and second points on the conductor... | 11/18/2003 |
| 6611409 | Line module protection method and device utilizing said method The present invention relates to a line module protection method and a device utilizing that method. According to the line module protection method of the present invention, line module protection is performed by switching the connection from a broken lin... | 08/26/2003 |
| 6539287 | Distribution control system capable of isolating fault section without using time limited sequential shift function A distribution control system includes in each of feeder terminal units a controller that updates a value in a latest current value storage area of a memory, every time a current value is detected at a sampling interval. If a distribution line fault takes... | 03/25/2003 |
| 6373669 | Process and arrangement for selective network monitoring for switchgear In switchgear with superordinate power circuit-breakers and a plurality of subordinate power circuit-breakers, the superordinate power circuit-breaker must be triggered in the event of failure of the subordinate power circuit-breakers. This is accomplishe... | 04/16/2002 |
| 6160690 | Distribution control system and distribution control method capable of isolating fault section without fail A distribution control system that can isolate a fault section without fail, even if control of load break switches becomes impossible because of a communication error between a control center and a feeder terminal unit. If a communication error takes pla... | 12/12/2000 |
| 6144110 | Vehicular use power distribution apparatus and vehicular use power source apparatus A vehicular use power distribution apparatus includes a battery mounted in a vehicle; a main control means connected directly to the battery; a first switch means connected to the battery; a power feed line for loads connected to the first switch means an... | 11/07/2000 |
| 6141195 | Data and/or energy transmission device with a disconnecting unit Short-circuits are liable to occur between the two conductors in a system in which data and/or energy is transmitted to a plurality of receivers/users via two conductors. Transmission is then interrupted and the supply source is inadmissibly over-loaded. ... | 10/31/2000 |
| 6075378 | Electrical energy storage capacitor power supply capable of shorting out defective capacitors There is disclosed a power supply for storing electrical energy in capacitors connected in series, the power supply having a function of shorting out capacitors at fault. Shorting means are connected in parallel with the capacitors, respectively. If any o... | 06/13/2000 |
| 5999389 | Repeater for bus with bus fault isolation A repeater for a communication network having an isolation circuit for disabling the transmission of a fault-indicative signal through the repeater onto the network. A retriggerable one-shot starts timing with high to low signal transition. In the absence... | 12/07/1999 |
| 5973899 | Automated power feeder restoration system and method A feeder restoration method starts in response to an overcurrent fault on a feeder (22) that causes a circuit breaker (42) to trip open, reclose once, trip again, and attempt to reclose again. During the time period between the first and second reclosings... | 10/26/1999 |
| 5973410 | Safety device for linking reference grounds in an integrated circuit The safety device, especially in an electronic motor vehicle control system, protects external circuit branches supplied with current from an engine/motor vehicle control unit so that a single short circuit results in failure of only that circuit branch i... | 10/26/1999 |
| 5920129 | Uninterruptible power supply having solid state transfer switch and method of operation thereof An uninterruptible power supply (UPS) for supplying DC power to a load and a method of providing uninterruptible DC power to a load. In one embodiment, the UPS includes: (1) a first stage rectifier that rectifies AC input power received from a primary pow... | 07/06/1999 |
| 5901024 | Apparatus and method for circuit protection Apparatus for redundancy circuit protection includes a controller (20), a plurality of circuits (22) coupled to the controller (20), and a redundancy switch (50) coupled between the plurality of circuits (22) and a network. The redundancy switch (50) is a... | 05/04/1999 |
