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:
Oct. 04, 1977
Filed:
Jan. 09, 1976
Applicant:
Inventors:
Ferenc Meckl, Tatabanya, HU;
Peter Piuk, Tatabanya, HU;
Assignee:
Banyaszati Kutato Intezet, Budapest, HU;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01V / ;
U.S. Cl.
CPC ...
73 712 ; 340 / ;
Abstract
The invention concerns apparatus for measuring the velocity of low frequency mechanical vibrations, comprising two springs between which a vibratable mass is secured, two electric coils mechanically coupled to the mass, a permanent magnet core in each coil which is stationary relative to its associated coil, one coil being a measuring coil while the other is a feedback coil; and a current generator having a control input to which the measuring coil is connected while the feedback coil is connected to the generator output, the connection polarities being so selected as to produce negative feedback.