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An extension member is attachable to a trailer hitch and extends away from the vehicle and is connected to a seating frame supporting a toilet seat.
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| Number | Title | Issue Date |
| 5052899 | Anti-surge compressor loading system A compressor coupled to a load of smaller capacity is provided for loading with a setpoint adjusting circuit substituting a pseudo-setpoint signal for the pressure signal derived from the load, so that the master-controller operates in response to a signa... | 10/01/1991 |
| 5046928 | Long term compressor control apparatus In a compressor control system, a subcontroller is coupled with the master-controller in order to detect, when the bypass valve is being modulated, whether there is a deviation between the minimum inlet valve position assigned to the system and the actual... | 09/10/1991 |
| 5043687 | Adjustable walking beam interlock mechanism A walking beam for interlocking control devices such as circuit breakers is characterized by a central bracket for supporting, on a mounting plate of the control devices, the beam through its central pin, and a single screw is provided for adjusting the c... | 08/27/1991 |
| 5032062 | Compressor demand control system for long term compressor operation In a compressor control system, surge upon a sharp demand for lower airflow is avoided by placing an offset value above the minimum airflow absolute limit. When reaching downward under inlet valve modulation such offset limit, the master-controller initia... | 07/16/1991 |
| 5006777 | AC input system for computer-based control system In a computer-based motor drive, a microcomputer is responsive to a plurality of input signals drived from the motor AC lines whenever contacts, or pushbuttons, commanding specific control operations to be performed, are closed. In such case, opto-coupler... | 04/09/1991 |
| 5005104 | Clip-connected terminal conductor assembly A clip-connected terminal conductor uses a terminal lug for tightening together with a screw the line cable and the conductor end. A channel is provided in the lug for inserting therein, and guided by lateral wall of the channel, a spring-like member havi... | 04/02/1991 |
| 4965499 | Parametric path modeling for an optical automatic seam tracker and real time robotic control system A control processor in a robotic system treats optically sensed locations along the path ahead of the tool, which are classified in relation to elapsed distances and identified in 3-D coordinates and 3-axes tool orientation, to apply in real time and unde... | 10/23/1990 |
| 4962339 | Pole-tying current control apparatus An induction motor torque/flux control system the motor flux is forced down while accelerating and force up while decelerating to maintain a required flux level at all speeds. This is achieved through vector control by generating a direct current componen... | 10/09/1990 |
| 4962406 | Compact DC/AC circuit breaker with common arc extinguishing capability A circuit breaker combines DC and AC arc extinguishing capabilities by associating a magnet applied permanently upon the outside wall of the insulating housing of the breaker and a U-shaped member of ferromagnetic material lodged and held inside the housi... | 10/09/1990 |
| 4952772 | Automatic seam tracker and real time error cumulative control system for an industrial robot A control processor in a robotic system treats optically sensed locations along the seam path ahead of the tool, which are classified in relation to elapsed distances and identified in 3-D coordinates and 3-axes tool orientation, to apply in real time and... | 08/28/1990 |
| 4940391 | Compressor surge detection system In a compressor system, surge detection is provided by sensing the current of the motor driving the compressor and reading oscillations of the current about the average thereof and above and below two opposite threshold levels from such average current an... | 07/10/1990 |
| 4896242 | Direct AC-DC converter fault protection system In a direct AC/AC converter, fault protection is performed with a minimal number of fault detecting devices and the rating of such fault detecting devices is reduced while still being able to respond quickly to a fault current. This is achieved by using a... | 01/23/1990 |
| 4876634 | Multi-pulse converter system In a multiphase AC/DC converter system a single transformer is used having phase shifted tappings drawn from a polygonal succession of long and short windings wherein some of the windings carry only the difference between the outputted currents derived fr... | 10/24/1989 |
| 4870338 | Load commutated inverter (LCI) induction motor drive A current source inverter for a load commutated induction motor drive is controlled in relation to the direct and quadrature components of the current vector as assigned in response to stator voltage, speed reference and actual speed. Control is on the in... | 09/26/1989 |
| 4866714 | Personal computer-based dynamic burn-in system An installation for the dynamic burn-in testing of a plurality of digital circuits, and/or microcomputer-controlled circuits, mounted in a burn-in chamber for testing includes a personal computer; power supply for the digital circuits, and a bilateral lin... | 09/12/1989 |
| 4862054 | Tacho-less vector control adaptive system for motor drive Adaptive control is used in an asynchronous motor drive. A reference model based on the model equation of the motor is combined with an adjustable model responsive to the direct and quadrature components of the current and to an estimated speed. An adapti... | 08/29/1989 |
| 4849679 | Image processing system for an optical seam tracker An image processing system uses the digital expression of the video image of a light stripe derived optically from a seam to create a 1-D signal representative of a one-pixel wide line. The target coordinates for the tool operating on the seam is converte... | 07/18/1989 |
| 4847747 | Commutation circuit for load-commutated inverter induction motor drives In a load commutated inverter induction motor drive a parallel capacitor bank is used in part to force-commutate the thyristors of the inverter as triggered by auxiliary thyristors and turned off by the other part of the capacitor bank.... | 07/11/1989 |
| 4843287 | Path contriving system for look-ahead sensor in a robotic control system A look-ahead sensor attached to the its effector end deviates upon each control action upon the robot toward a new position along the seam path. The chord across the seam path from the present effector end to the contemporaneously sensed seam path locatio... | 06/27/1989 |
| 4833381 | Optical automatic seam tracker and real time control system for an industrial robot A control processor in a robotic system treats optically sensed locations along the seam path ahead of the tool, which are classified in relation to elapsed distances and identified in 3-D coordinates and 3-axes tool orientation, to apply in real time and... | 05/23/1989 |
| 4833389 | Current source inverter control system for load commutated induction motor drive In a load commutated induction motor drive stability is achieved in a runaway situation by generating in response to the motor speed reference signal a signal representative of the desired power factor angle and in using such signal to delay by that much ... | 05/23/1989 |
| 4833588 | Direct AC/AC converter system In a direct AC to AC converter system the normal rectifier assistance functions are phase modulated by a 30° lag and by a 30° lead, and switching between lagging and leading function is effected at a high frequency according to a duty cycle: ##EQU1... | 05/23/1989 |
| 4811236 | Transmission line voltage detector for static VAR generator In order to maintain low telephone interference (IT factor) during its normal operation and to establish rapid-post-fault voltage support to preserve the integrity of electric power transmission lines in the presence of degraded system impedance and harmo... | 03/07/1989 |
| 4788635 | Converter system combining a two-quadrant voltage-source rectifier and a four-quadrant voltage-source inverter, and a motor drive embodying the same In an AC motor drive, a voltage-source inverter is provided in the DC-link thereof with a GTO switching arrangement which upon braking allows matching the voltage, current domains for the forward power and regeneration modes, the GTO devices being interru... | 11/29/1988 |
| 4771224 | Digital pulse generator for controlled thyristor switches and motor drive embodying the same In a microcomputer-based multi-function thyristor-controlled AC induction motor drive, the microcomputer effectuates the several control functions of the motor drive during respective time intervals corresponding to the sequence of firing of the thyristor... | 09/13/1988 |
| 4757435 | Static-controlled current-source AC/DC power converter and DC/AC power converter, and protection system embodying the same In a current-source GTO converter, protection against a DC fault or a commutation fault condition is provided by immediately interrupting the conduction of a GTO device which is ON and by turning ON another GTO device to allow fault current to bypass the ... | 07/12/1988 |
| 4746850 | Start-up system for a synchronous motor drive In a load commutated inverter (LCI) motor drive, the motor is started from a rotor rest position by modulating the rotor winding with a field current at a constant rate to induce stator voltages which are detected in terms of signs, so as to identify the ... | 05/24/1988 |
| 4743832 | Protection system for thyristor-controlled reactors To a static VAR generator of the split reactor type, a scaled down model is associated to be controlled concurrently with the static switches of the split reactor and to generate under proportional line voltage a simulated reactive current which is matche... | 05/10/1988 |
| 4740738 | Reluctance motor control system and method A reluctance motor control system is stabilized by a load angle feedback control loop provided by a computation of the load angle from sensed voltage and current on the terminals of the motor with the assist of a derived frequency signal. The motor is ope... | 04/26/1988 |
| 4727305 | Multi-function control system for an induction motor drive In an induction motor drive controlled by SCR devices connected in the AC power supply phase lines of the motor, a plurality of channels establish, on a common input to a digital gate pulse generator of the SCR's, various signals occurring in the course o... | 02/23/1988 |
| 4719402 | VAR generator system with minimal standby losses In a hybrid switched-capacitor controlled-reactor static VAR compensator including a fixed-capacitor, hysteresis on switching-OFF a switchable capacitor of the capacitance bank is performed with a minimal fixed-hysteresis at the entrance of the standby re... | 01/12/1988 |
| 4719398 | Coasting AC motor restart system and method A variable frequency adjustable speed motor drive allows restart of a spinning induction motor by initially increasing the frequency of the associated inverter while keeping the DC voltage source thereof low, then by decreasing the frequency of the invert... | 01/12/1988 |
| 4713745 | Vector-controlled unrestricted frequency changer (UFC) system and variable speed AC motor drive using such a system A UFC is controlled with polar coordinates, a phase checked loop combining with an angular demand to establish a predetermined and tuned sequence of switch combinations between the converters of the UFC, to generate between the output phase-loads the desi... | 12/15/1987 |
| 4713743 | Load-commutated inverter and synchronous motor drive embodying the same In a load commutated inverter system, the recovery time of the outgoing static switch is extended by applying an auxiliary commutation voltage in series with the associated phase line. This action is triggered in response to the gating signal of the on-co... | 12/15/1987 |
| 4710703 | Direction sensing system for an AC power supply and AC motor drive with such direction sensing system The direction of rotation of a three-phase voltage is determined by simultaneous reading of counters triggered by the respective phase zero crossings. Such determination is used in an AC motor drive to dispense of using a tachometer.... | 12/01/1987 |
| 4707651 | Voltage-controlled field-oriented induction motor control system An induction motor drive control system is controlled according to a torque demand and a rotor flux amplitude demand while using only a shaft position feedback and providing an open loop equivalent of a vector voltage control approach to the control of th... | 11/17/1987 |
| 4707777 | Precommutated current source inverter In an auto-sequential commutated current source inverter (ASCI) system, an auxiliary bridge of thyristors is connected between auxiliary terminals, and a capacitor is charged and discharged resonantly by controlling a corresponding auxiliary thyristor of ... | 11/17/1987 |
| 4698739 | 12-Pulse motor drive The present invention relates to an AC motor drive including two sets of inverters, wherein one transformer is converted on the output of one of the two inverters, the output of the transformer being connected in series with the output of the other invert... | 10/06/1987 |
| 4697131 | Voltage source inverter and variable frequency, constant voltage AC motor drive embodying the same A constant voltage voltage-source inverter of a motor drive includes in its DC-link the combination of diode means, a GTO device and an auxiliary thyristor, the GTO device and the auxiliary thyristor upon transferring to the regenerating mode being cyclic... | 09/29/1987 |
| 4697230 | AC power supplied static switching apparatus having energy recovery capability A three-phase matrix converter including switches having snubber circuits associated thereto, is provided with a common voltage clamp capacitor for limiting the voltage applied to the snubber capacitor, and energy is accumulated in the clamp capacitor whi... | 09/29/1987 |
