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A forehead support apparatus for resting a standing users forehead against a wall above a bathroom commode or urinal or beneath a showerhead.
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| Number | Title | Issue Date |
| 6577089 | Pressure control system using input current sensing A method and apparatus for controlling the output function of a permanent magnet brushless DC motor (20), by sensing an input current to the motor (20), by computing an output torque generated by the motor (20) as a function of the input current to the mo... | 06/10/2003 |
| 6504338 | Constant CFM control algorithm for an air moving system utilizing a centrifugal blower driven by an induction motor A method and apparatus for achieving constant air flow rate economically utilizes an induction blower motor with control settings determining the motor excitation voltage. A memory stores, for a variety of motor speeds, a graph of the speeds plotted again... | 01/07/2003 |
| 6337949 | System for controlling an electric motor of a fan associated with heat exchangers in a motor vehicle The system comprises a pressure sensor for providing a signal indicative of the pressure of the refrigerant fluid of the air-conditioning system at the output or delivery of the compressor of the system, a sensor for detecting the temperature of the liqui... | 01/08/2002 |
| 6052636 | Apparatus and method for positioning an excavator housing An apparatus and method for rotatably positioning a machine housing is disclosed. A pump produces pressurized fluid to a motor that responsively rotates the machine housing. A control valve regulates fluid flow from the pump to the motor. A position senso... | 04/18/2000 |
| 6043622 | Motor drive controller A one-phase electromagnetic motor drive controller includes a one-phase electromagnetic motor, a position detection mechanism for detecting a rotational position of the motor and a control mechanism for controlling the drive of the one-phase electromagnet... | 03/28/2000 |
| 5736823 | Constant air flow control apparatus and method Air handling apparatus (10) delivers a volume of air at a generally constant flow rate regardless of changes in the operating conditions of a system with which the apparatus is used. A blower (12) pushes air from one point to another. The blower is operat... | 04/07/1998 |
| 5680021 | Systems and methods for controlling a draft inducer for a furnace Draft inducer systems and methods for use with a furnace. A motor drives a fan in response to a motor control signal for inducing a draft which is a function of motor speed and motor torque. A processor defines a speed/torque operating curve having a mini... | 10/21/1997 |
| 5447414 | Constant air flow control apparatus and method Air handling apparatus (10) for delivering a volume of air at a generally constant flow rate regardless of changes in the operating conditions of a system with which the apparatus is used. A blower (12) pushes air from one point to another. The blower is ... | 09/05/1995 |
| 5448148 | Apparatus for positioning an excavator housing A method and apparatus for positioning a housing of an excavator housing. A motor receives pressurized fluid to cause rotation of the excavator housing. A motor position sensor determines the rotational position of the housing and responsively produces a ... | 09/05/1995 |
| 4933614 | Motor drive control circuit A blower motor drive control circuit is configured to maintain a fixed value of motor driving current to maintain a constant amount of air supply from an air conditioner regardless of changes in the amount of intake air.... | 06/12/1990 |
| 4763054 | Level detector A level detector includes first and second comparators each having two inputs and an output wherein the first comparator receives an input signal and a first reference signal at the two inputs thereof and develops a first comparison signal when the input ... | 08/09/1988 |
| 4728869 | Pulsewidth modulated pressure control system for chemical vapor deposition apparatus A low pressure control system for chemical vapor deposition (CVD) apparatus, including a vacuum pressure chamber and an exhaust pump, is provided by a vacuum pump DC motor which is supplied power from a DC motor speed controller coupled to a DC control in... | 03/01/1988 |
| 4673850 | Universal motor control system An electrical control means useful in systems wherein a motor, such as a blower motor for an air handling unit, must be run at different speed levels and wherein low voltage power must simultaneously be supplied to another part of the system such as a con... | 06/16/1987 |
| 4644238 | Airflow control apparatus An apparatus for controlling an airflow to a boiler or the like and maintaining a desired quantity thereof. The apparatus comprises a controller for generating a control signal of a level corresponding to a required airflow, a variable-frequency power sup... | 02/17/1987 |
| 4639650 | Control system for a cooling fan in an impact printer A control system for an impact printer having a cooling fan, in which a current for driving a printing device is detected as a voltage and the detected voltage is compared with a reference value. When the detected voltage is lower than the reference value... | 01/27/1987 |
| 4629954 | Closed loop control method for hydraulic apparatus A non-linear function f(A) of an effective value D' with respect to a desired value A regarding speed, pressure or the like of an actuator of a hydraulic apparatus in a closed loop control for the hydraulic apparatus is operated and a value regarding quan... | 12/16/1986 |
| 4588934 | Automobile fan control with non-periodic fluctuation signal generator An automobile fan controller comprises: a fluctuation signal generator for generating a fluctuation signal; a pulse-width-modulation circuit including a triangle generator for generating a triangle-waveform signal having a constant amplitude and a constan... | 05/13/1986 |
| 4587808 | Control system for hydraulic circuit means A control system for a hydraulic circuit having a variable displacement hydraulic pump, and an actuator driven by the pump, in which a pump control controls a displacement volume varying member of the pump based on an operating signal giving a command wit... | 05/13/1986 |
| 4567414 | Method and a device for controlling a brush-commutator assembly of an electric machine A method and a device for controlling a brush-commutator assembly of a machine under application of an electrical processing and control unit, by sensing one or more operating parameters of the electric machine, the sensing values being processed and conv... | 01/28/1986 |
| 4391362 | Speed controlled infeed conveyor system A speed controlled conveyor system in which the motor driving an input conveyor is speed regulated to control the axial product pressure. This pressure is measured by the outward bowing of the column of articles as it moves along a downwardly curving chut... | 07/05/1983 |
| 4384825 | Personal sampling pump A portable battery powered pump providing constant mass flow of air sample through a particular filter or vapor trap in which the pump drive motor speed is controlled by an amplifier having a reference voltage input and an inverse feedback signal related ... | 05/24/1983 |
| 4236103 | Control circuit for a direct current motor A control circuit for a direct current electric motor including a rectifying bridge for supplying the motor with direct current and a regulating circuit including a triac, the energizing angle of which is determined by a capacitor connected in series with... | 11/25/1980 |
| 4135121 | Variable-speed drive system with hydrostatic transmission and electric shunt motor A drive system for a utility vehicle, such as a fork-lift truck, comprises a hydrostatic transmission whose pump is driven by an electric shunt-wound motor having a field winding so energized, under the control of a potentiometer responsive to the fluid p... | 01/16/1979 |
| 4109190 | Circuit for increasing the operating speed range of a velocity servo system A velocity servo system for driving a motor to control the movement of a member. The system is comprised of means coupled to the motor for generating a signal indicative of the actual velocity of a member being driven by the motor, integrator means respon... | 08/22/1978 |
| 4044287 | Circuit for energizing the electromotor driving a blower A constant current source is provided for the energizing circuit of an electromotor driving a blower. The constant current source includes a battery connected in parallel with a series circuit including the energizing circuit of the motor, the emitter-col... | 08/23/1977 |
| 4016467 | Servodrive apparatus for driving the postage printing drum in a postage meter A servodrive apparatus is disclosed for a postage meter having a postage printing drum mounted for rotation from and to a home position in single revolution increments and a conveyor for transporting individual pieces of mail into operative engagement wit... | 04/05/1977 |
| 3991349 | Droop adjustable control apparatus for direct current motor drives A field-controlled direct current motor is provided with a circuit responsive to armature current which is adjustable as to the amount of armature current representative signal, and the adjusted current representative signal is used to provide a selected ... | 11/09/1976 |
