Richard J Graefe, Age 8528825 Winthrop Cir, Bonita Springs, FL 34134

4634951, Jan 6, 1987

Jun 3, 1985

6/743862

Julian C. Kampf - Grafton WI
Jeffrey A. Reichard - Milwaukee WI
James T. Libert - Waukesha WI
Earl J. Curran - South Milwaukee WI
Richard J. Graefe - Bayside WI

Square D Company - Palatine IL

H02P 128
H02P 130

318778

Gradual starting of an electric motor is provided by increasing the voltage applied to the motor. A reduced voltage starter controls the application of a voltage derived from a line voltage to a motor by using a voltage ramp acceleration control circuit comprising, means for generating a ramp voltage having a predetermined rate of rise, means for controlling the voltage applied to the motor in response to the ramp voltage, means for sensing that the motor is running at substantially full speed, and means responsive to the means for sensing that the motor is running at substantially full speed for increasing the predetermined rate of rise of the ramp voltage, whereby under conditions where the motor is running at substantially full speed before the voltage applied to the motor reaches the line voltage, then the voltage applied to the motor will rise at the increased predetermined rate of rise of the ramp voltage.

4345288, Aug 17, 1982

May 4, 1981

6/260545

Julian C. Kampf - Grafton WI
Richard J. Graefe - Bayside WI
Mark V. Profio - Wauwatosa WI

Square D Company - Palatine IL

H02H 7085
H02H 709

361 31

A solid state overload relay protective apparatus for electric motors which includes not only the overload feature, but the additional features of underload and single phase protection. Small current transformers for sensing the current flow in each phase of the motor are utilized, like those found in the ground fault sensing art because a current-to-voltage converter circuit reflects a short circuit back to the secondary of the transformers. The signal from the current transformers which is proportional to the sensed current in the motor is fed through the converter, a scaling and summing amplifier adjustable for a wide range of motor full load currents, an ideal diode peak detector, a time integrator amplifier, to one input of a comparator circuit having a trip reference voltage signal at another input. The comparator provides an output signal to a transistorized trip level circuit that deenergizes a coil of an overload relay opening its contacts and interrupting power to the motor.

4714977, Dec 22, 1987

Jun 5, 1987

7/059248

John S. Hoelzer - Wauwatosa WI
Richard J. Graefe - Milwaukee WI
James T. Libert - Waukesha WI

Square D Company - Palatine IL

H01H 4732

361196

A machine tool timing relay has immunity from electrical noise on a control signal, and has an oscillator capable of generating pulses having a predetermined frequency, a means for adjusting the predetermined frequency over a continuous range of frequencies, a counter capable of counting the pulses and capable of generating an output signal after a predetermined number of the pulses are counted, means responsive to a start signal for initiating the counter to count the pulses, an optical isolator circuit responsive to the control signal for generating a light, detecting the light, and generating the start signal in response to detecting the light in order to isolate the counter from electrical noise mixed with the control signal, an electrical contact, and an output circuit responsive to the output signal for operating the electrical contact when the counter generates the output signal so that the contact is operated after the counter counts a predetermined number of the pulses. The contact is controlled after an interval of time required for the oscillator to generate the predetermined number of pulses. An electromechanical relay serves as the contact.