The Singer Company

Mechanical Ingenuity Corp.

Other

Atlas Roll-lite Door Corporation

Automatic Doorman, Inc.

Joseph L. Brooks Manufacturing Corp.

Howard L Beckerman

Allan M Dob

Russell J Pepe

John W Wurst

Walter H Marsh

William S Trimmer

Robert Louis Sedlatschek

Charles L Mauro, Jr

Joshua D Costell

Peter J Manning

This invention discloses an electronic control system for an Industrial Motor Operator that uses standard steady state logic to improve reliability in rough service wet and dirty environments. It includes means of providing electronic snow limit to close limit sensing removing the need for two switches and radically improving its accuracy. A low voltage switch reverses the high voltage motor wires and at the same time reverses the open limit, close limit, and snow limit sensors mechanical positions. It discloses a system using lamps to indicate that the power wiring is connecting to three-phase motors in the correct sequence or that single-phase motors have their windings correctly phased.

Electronic industrial motor operator control system

A one wire interface for optical emitter-detectors is disclosed that is fail-safe, simple, and includes diagnostics, noise and static protection. Two indicator lamps are used for diagnostics indicating four conditions; a) Ready, b) Not Connected, c) Blocked Beam, d) No power. This allows single or two conductor systems to have the same troubleshooting information as the 4-wire systems.

Fail safe one wire interface for optical emitter-detector photo-eye systems with diagnostics

A simple non-moving passive electric probe detects the height of a solution along its surface. Liquid resistance and thin water films are disregarded and setting of the liquid level is accomplished electronically without moving the probe. An output signal proportional to the height of a solution along the probe length is provided. Means are disclosed electrically pierce though oil films, soap foams or grease layers that can coat a probe, preventing contact with the solution. The system will sense distilled water, city water, sewage, wine, milk, soda, juice, alcohol, latex paint or any other water based solutions.

Electronic water solution level detector

A method and apparatus for controlling refrigerant gas pressure in a low pressure refrigeration system including a warm surface within a container. Liquid refrigerant is removed from the refrigeration system evaporator and sprayed on the warm surface, thereby vaporizing. The resulting pressure differential between the container and the evaporator causes the vaporized refrigerant to be returned to the evaporator through an open return line. The warm, surface is downwardly concave so that non-volatile liquid which had been mixed with the refrigerant can be collected from the bottom of the surface and transported to a location remote from the evaporator, thereby separating contaminants from refrigerant.

Method and apparatus for controlling refrigerant gas in a low pressure

A variable speed control system for a single phase AC induction motor wherein a controllable switch is in series with the main winding of the motor, while the auxiliary winding of the motor, which is in series with a capacitor, is continuously energized. The switch is opened whenever the current through the main winding passes through zero. While the switch is open, the back e.m.f. in the main winding is sensed to provide a measure of the speed of the motor. This is compared with a desired speed signal and the comparison is utilized to control closure of the switch. The speed of the motor then remains constant at the desired speed, even with a varying load.

Single phase AC motor speed control system

An arrangement for detecting a motor overload condition by examining the phase angle relationship between the motor voltage and current. As the load increases, the phase angle difference approaches zero. By measuring the zero crossings of the voltage and current and providing a signal representative of the time difference between these crossings, the phase angle relationship is determined and, accordingly, so is the motor load. Specifically, a saturable ferromagnetic core is utilized to detect the current zero crossings.

Motor overload indicating arrangement

A safety arrangement for an automatic door operator wherein the door edge has mounted thereon a stretched electrically conductive cable which, when deflected upon encountering an obstruction, will change the inductance of a loop of which the cable forms a part. A capacitor is in parallel with this loop so that the capacitor together with the inductance of the loop form a resonant tank circuit. The tank circuit is electrically driven by a voltage controlled oscillator. The phase of the loop current is compared with the phase of the voltage across the capacitor and the phase difference is utilized to control the voltage controlled oscillator to maintain the tank circuit in resonance (i.e, zero phase difference). The detection of a sudden change in phase difference, which occurs when the loop inductance is suddenly changed due to the encountering of an obstruction by the door edge, results in the generation of an obstruction signal for activating the safety feature of the door operator.

Safety arrangement for automatic door operator

An emergency light control and battery charging system utilizes a temperature compensated switched voltage regulator for charging the battery. Energization of the emergency light is effected through a field effect transistor which is turned on through a voltage doubler circuit enabled when there is a failure in the power supply. The system is arranged with a latch that insures that the light is not turned on when the battery is connected until after line power is initially applied. A low battery voltage detector insures that the battery is protected from a deep cycle discharge if line voltage is not restored.

Emergency light control and battery charging system

A method and apparatus for electronically pressure sealing and leak testing an idle centrifugal chiller system wherein a small positive differential is maintained between the internal refrigerant vessel pressure of the chiller system and the ambient atmosphere. This differential pressure is maintained by selectively applying heat to the refrigerant.

Method and apparatus for electronically pressure sealing and leak

A transient voltage surge suppressor including first and second clamping stages with a surge reactor between the stages. The first stage comprises a metal oxide varistor and the second stage comprises a silicon surge suppressor diode. The surge reactor comprises first and second coils wound with the same polarity on a single ferromagnetic core.

Transient voltage surge suppressor

An improved arrangement for controlling the speed and direction of rotation of a DC motor responds to a variable bipolar input signal. A bipolar threshold detector coupled to the motor is used for the selective triggering of a triac during the appropriate half wave polarity of an AC source. Triac failure is prevented by a protection circuit. The arrangement incorporates a speed servo and senses the voltage across the triac to detect the speed of the motor.

Arrangement for controlling the speed of a DC motor

An automatic door operator system is provided with a first potentiometer having its wiper arm coupled to a pivoting member whose angular position varies in accordance with the magnitude and direction of an obstructive load applied to the door. A second potentiometer is provided having its wiper arm coupled to a movable member whose position corresponds to the position of the door. The potentiometers are connected as voltage dividers and the voltages provided at their wiper arms are utilized for controlling the movement of the door.

Automatic door operator

An electronically controlled sewing machine is provided with an arrangement for displaying a pictorial representation of a pattern to be sewn by the sewing machine. When the sewing machine user operates controls to alter the size and/or shape of the pattern, the display is correspondingly altered.

Pattern display arrangement for an electronically controlled sewing

A multiple pattern sewing machine is provided with a first group of switches which are always visible and functional for selecting a pattern from a first group of stitch patterns which the sewing machine is capable of sewing. A second group of switches is concealed beneath a cover member. Also concealed by the cover member is a plurality of information bearing pivotally mounted plates. The machine contains circuitry for sensing which of the plates is exposed and dependent thereupon, the second group of switches may be actuated by an operator for selecting a pattern from a second group of patterns which the machine is capable of sewing.

Pattern selection arrangement for a multiple pattern sewing machine

The combination of an electronically controlled sewing machine and an auxiliary memory comprising pages of a book, or the like, each page having optical bar coded stitch pattern data printed thereon and in obvious association with a graphic representation of the actual stitch pattern. The coded data is sensed by a hand held optical reader which transfers the data, for a desired stitch pattern, to internal memory of the sewing machine.

Growing community of inventors

Middletown, NJ, United States of America

Howard L Beckerman