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:
Aug. 07, 1990
Filed:
Sep. 08, 1989
Virgil R Dahlmann, Bloomfield Hills, MI (US);
Karen M Pirrallo, Troy, MI (US);
Kelly A Talaki, Troy, MI (US);
Kenneth J Zielesch, Fraser, MI (US);
Robert Hickling, Oxford, MS (US);
General Motors Corporation, Detroit, MI (US);
Abstract
Valve spring assemblies are checked for proper assembly of keys by ultrasonically scanning a plurality of assemblies along a path crossing the stem, keys and cap to acquire profile data; compensating for temperature effects by determining the average time of flight to the stems, which are nominally the same distance from the ultrasonic sensor, and searching for each individual stem in a window centered on the average time of flight; then defining windows for the keys and cap offset from the measured surface of each stem; and searching the data for points within the respective windows to determine proper positioning of each element. The apparatus includes ultrasonic equipment, a scanning manipulator to move the ultrasonic sensor over the part, and a computer interfaced to the ultrasonic equipment and manipulator for control and data analysis.