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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 |
| 5869800 | Phase distortion compensated time base for a welder control A phase controlled weld controller system provides a stable timebase phase reference which has improved transient response in the presence of spurious noise generated by other external equipment coupled to the same voltage source. The system estimates a p... | 02/09/1999 |
| 5821491 | Multiple single phase weld control systems coupled to a polyphase power source A weld control system, supplied by a polyphase voltage source, consists of an isolation contactor supplying power to separate single phase weld controllers. The single phase weld control systems have their separate power modules combined into a single pow... | 10/13/1998 |
| 5760361 | Multiple single phase weld control systems from a polyphase power source A weld control system, supplied by a polyphase voltage source, consists of multiple and separate single phase weld controllers. The single phase weld control systems have their separate power modules combined into a single power module assembly for more e... | 06/02/1998 |
| 5607604 | Apparatus for detecting voltage across thyristor in alternating-current resistance welding machine A thyristor voltage detector includes a current-limiting resistor having a high resistance (e.g., 30 kilo-ohm) and a switching device (e.g., photo MOS FET) of a switching photo coupler which are serially connected between a thyristor and a waveform conver... | 03/04/1997 |
| 5585997 | Hydrogen thyratron modulator A single resonant DC charging circuit provides both the power and timing for the pedestal insertion is, likewise, controlled by a single trigger circuit input and by a saturable reactor which controls the firing of a thyratron switch.... | 12/17/1996 |
| 4963707 | Resistance welding control system A resistance welding control system is disclosed which comprises a resistance detection unit for detecting an interelectrode resistance by measuring welding current and voltage applied between electrodes; a compensation section for comparing a resistance ... | 10/16/1990 |
| 4945201 | Rack mountable weld controller A rack mountable weld controller for use as a plug in card within a rack of a programmable logical controller (PLC) system. All signals between the PLC and the weld controller are through the backplane of the rack in which the weld controller is installed... | 07/31/1990 |
| 4885451 | Automatic stepper for resistance welding A method is disclosed for controlling the magnitude of current delivered through welding electrodes to a workpiece to be welded using resistance welding techniques, in order to prevent weld expulsion and concomitant diminishment of weld quality. Weld expu... | 12/05/1989 |
| 4876431 | Microprocessor welder controller A welding system controller for controlling the welding of a workpiece including a switch for selectively applying power to a welding transformer and a controller for controlling the power delivered to the welding transformer by the switch to set the powe... | 10/24/1989 |
| 4851635 | Method and apparatus for determining the power factor of a circuit Structure for and method of controlling the firing point of thyristors in a phase controlled contactor in a resistance welding circuit in accordance with variations in current line voltage and/or one of resistance and inductive impedance in the welding ci... | 07/25/1989 |
| 4745255 | Method and apparatus for welding current regulation for a resistance welding machine A method and arrangement are described for regulating the welding operation in a resistance welding machine by sensing the welding current and controlling the welding time. A first integrator (20) determines the desired total energy to be supplied to a we... | 05/17/1988 |
| 4716267 | Three phase high frequency spike welding system A resistance-type welder employing a three phase, pulsed power supply and a pair of opposed electrodes which a workpiece may be clamped under pressure, includes a microcomputer based control system for allowing precise selection and control of welding seq... | 12/29/1987 |
| 4700042 | Device for controlling electrical resistance welding apparatus, particularly for controlling apparatus for welding parts of motor vehicles bodies In electrical resistance welding apparatus comprising two welding electrodes connected through respective supply cables to an electrical power supply which can generate welding current with selectively-variable effective values, a control device is provid... | 10/13/1987 |
| 4628176 | Apparatus for setting schedules of a resistance welding machine Items constituting a resistance welding schedule are set to desired numerical values by pressing three kinds of keys, namely a shift key for designating one item after another, and increment and decrement keys for setting or changing a numerical value cor... | 12/09/1986 |
| 4560852 | Spike welding system having improved power supply A power supply for a pulse type electrical resistance welder includes an A.C. source of electrical power, a firing circuit for delivering spikes of current to a pair of welding electrodes and a precharging circuit for precharging the firing circuit with a... | 12/24/1985 |
| 4532399 | Apparatus and method of welding nails to wires An improvement in a method of welding the shanks of successive nails to a pair of wires to form a series of wire connected nails suitable for packaging and use in a power driven fastener driving device which includes the steps of connecting a pair of elec... | 07/30/1985 |
| 4493040 | Apparatus and method of phase control for resistance welding and other resistive-inductive loads A computer-controlled welding apparatus includes a phase-controlled resistance welding circuit (A) for selectively conducting pulses of a welding current to a workpiece (B) and a control circuit (C) for controlling the conduction of the welding current. T... | 01/08/1985 |
| 4490795 | Apparatus for controlling and programming welding guns An apparatus for controlling and programming welding guns, constituted by a set of electronic component circuit boards enclosed in a casing provided with a keyboard and a programming and control display unit which are connected electrically together so as... | 12/25/1984 |
| 4465918 | Method for controlling welding current A method for controlling a welding current in a resistance welder which phase-controls an A.C. power supply voltage by a thyristor to control the welding current to a target value. Prior to supplying the welding current, a test current is supplied to meas... | 08/14/1984 |
| 4463244 | Air core type current pulse and power factor monitoring and control system for a resistance welding apparatus A monitoring and control system for a resistance welding apparatus. The system monitors the quality of a weld as a weld is formed and terminates the welding current when a quality weld is completed. The monitoring function is performed by detecting a chan... | 07/31/1984 |
| 4459456 | Feedback welder control system A control system for resistance welders of the type in which welding current is supplied to a workpiece through a transformer. The system assures weld quality by monitoring the change in resistance across the weld during the welding operation without the ... | 07/10/1984 |
| 4459457 | Feedback welder control system A control system for resistance welders of the type in which welding current is supplied to a workpiece through a transformer. The system assures weld quality by monitoring the change in resistance across the weld during the welding operation without the ... | 07/10/1984 |
| 4458132 | Welding apparatus and control system therefor A resistance-type welder employing a pulsed power supply and a pair of opposed electrodes between which a workpiece may be clamped under pressure, includes a microcomputer based control system for allowing precise selection and control of welding sequence... | 07/03/1984 |
| 4456809 | Microprocessor-controlled controller for resistance welding machines A precision key pad controlled controller for a resistance welding machine is provided which may be set to deliver welding power to each of a multiplicity of welding operations on a precisely controlled repeatable basis. The controller incorporates circui... | 06/26/1984 |
| 4442337 | Method and system for dual control of resistance welding A method and system for controlling resistance welding whereby the preferred quality of resistance welding can be ensured automatically during the welding process by controlling the electrode pressure so that the electrode resistance changes in accordance... | 04/10/1984 |
| 4419559 | Resistive welder having a controlled output voltage unaffected by secondary circuit disconnection A resistance welder is provided having an electronic contactor, a welding transformer coupled in series with the electronic contactor, and a secondary circuit with a welding load connected to the welding transformer. The series circuit of the electronic c... | 12/06/1983 |
| 4387289 | Control system for resistance welding A system for resistance welding in which the welding voltage between the electrodes is controlled by changing the pressure applied to the electrodes or the firing phase angle of the welding current in accordance with a reference voltage curve or a referen... | 06/07/1983 |
| 4306138 | Power supply apparatus for resistance welder including means for preventing polarized transformer excitation A power supply apparatus for a resistance welder has an inverse-parallel thyristor circuit for constrolling the welding current. One of thyristors connected in inverse-parallel relationship is turned on by a first signal whose reference phase is establish... | 12/15/1981 |
| 4301351 | Modular microprocessor-controlled controller for resistance for resistance welding machines A precision resistance welding machine controller is provided which may be set to deliver welding power to each of a multiplicity of welding operations on a precisely controlled repeatable basis. The controller of the invention is modular in nature and is... | 11/17/1981 |
| 4289951 | Power factor monitoring and control system for resistance welding with line disturbance immunity A power factor monitoring and control system with line disturbance immunity for controlling the quality of spot welds made by resistance welding techniques such as those used in the automotive industry on assembly line welders. As is commonly known, quali... | 09/15/1981 |
| 4289948 | Automatic voltage compensation for digital welder control system An automatic voltage compensation control for a microprocessor controlled resistance welder system includes a digital voltmeter for measuring the line voltage cycle by cycle and associated circuitry to compensate the welding current in response to the mea... | 09/15/1981 |
| 4230929 | Control circuit for a welding device A control circuit for accurately controlling the duration of a welding operation. In a preferred embodiment the control circuit includes first and second connectors for connecting the control circuit to a power source, welding and control transformers, th... | 10/28/1980 |
| 4158121 | Spot welder control circuit A phase controlled regulating circuit for a portable spot welder having an output transformer, utilizes a normally saturated transistor across one diagonal of a diode bridge circuit to interrupt the connection between the control voltage source and the re... | 06/12/1979 |
| 4132880 | Seam welding method and apparatus A high speed seam welding system wherein single phase alternating current welding pulses are applied to electrode mechanism during only a less than maximum amplitude fractional portion of the wave form representing each successive current half cycle, and ... | 01/02/1979 |
| 4076974 | Current control device and method A circuit for improved control of current for use in conjunction with an inductive load, for example, a transformer in a welding operation. The circuit of this invention is adapted to maintain the percentage of total RMS current demand directly proportion... | 02/28/1978 |
