Harris Corporation

Fibreboard Corporation

Russell A Johnson

John Warner Shipley

Warren H Miller

Thomas Harvey Otten

Willie T Burton, Jr

Jeffery R Anderson

Charles E Devrick

Nicholas J Houmis

A linear force actuator system for stabilizing a support structure employs a linear dc motor whose primary winding is driven by a pulse width modulation control signal representative of a force input, through which the secondary member of the motor which acts as an inertial mass, is to be controllably translated. For improved control accuracy, the actuator system of the invention employs a pair of feedback loops, one of which monitors the current in the motor's primary winding to maintain a constant force output to the secondary member and a secondary of which monitors long term deviations from the center of the secondary member and corrects for centering offsets. An opto-electronic position sensing arrangement monitors the movement of the secondary member whereby precise control of commutation of the coils of the primary winding and a smooth translation of the secondary member are obtained.

Linear dc motor vibration controller

Apparatus for cutting an annular groove about a rotating cylindrical member includes a rotating cutter positioned in cutting relation to the outer surface of the cylindrical member and including a plurality of cutting edges, each forwardly angled in relation to the direction of rotation of the cutter. The cylindrical member and cutter rotate in the same direction so that an annular groove or channel is cut in and along the outer surface of the cylindrical member. Sealing apparatus is included for providing sealing between the outer surface of such member and the inner surface of a member overlying such first-mentioned member. The sealing apparatus is of resilient material and is seated in the channel. The sealing apparatus includes a pair of elongated ribs angled in the same direction, and in contact with each other when in such sealing situation, with the elongated side surface of one of such ribs in sealing contact with the inner surface of such overlying member.

Apparatus for cutting a member and seal means for association with such

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Brandon, FL, United States of America

Russell A Johnson