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. 23, 1984
Filed:
Sep. 28, 1982
Applicant:
Inventor:
Yoshiaki Kakino, Sakyo-ku, Kyoto-Shi, JP;
Assignees:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; G08B / ; B23B / ;
U.S. Cl.
CPC ...
408-6 ; 408-9 ; 408 11 ; 73104 ; 340683 ; 409134 ; 409194 ;
Abstract
When a drill is overloaded, while cutting a hole in a workpiece, a torque limiter disconnects the drill from a main spindle. As the drill is disconnected from the main spindle, the torque limiter generates high-level elastic waves. The elastic waves are converted by a transducer into a voltage signal. The level of the voltage signal is compared with a threshold value.