The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 22, 1980
Filed:
Jul. 14, 1978
Loring C Chien, Houston, TX (US);
Dresser Industries, Inc., Dallas, TX (US);
Abstract
The pumping rate of an oil well pump or other recurring event is determined by providing a force sensor, such as an accelerometer, and a transmitter arranged in a housing adapted to be affixed to the pump piston rod or drive train which move in a vertical plane. As the piston rod or drive train moves, the sensor measures gravitational and centrifugal forces, the former providing a sinousoidally varying sensor output having a period equal to the rotational or reciprocal period of the piston rod or drive train. The transmitter is a battery-powered R.F. device which is activated once each stroke or revolution by an amplifier-detector coupled to the output of the force sensor. A one-shot multivibrator is used to transmit a short burst during the on-time and such burst may be modulated for better noise rejection by the receiver. The receiver is located remote from the sensor/transmitter package and comprises an R.F. detector, amplifier and, if required, a demodulator. Each output pulse from the receiver circuit represents one rotation or oscillation of the machine element.