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:
May. 23, 1989
Filed:
Nov. 03, 1986
Applicant:
Inventor:
John T Boys, Birkenhead, NZ;
Assignee:
SPS Technologies, Inc., Newtown, PA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23Q / ;
U.S. Cl.
CPC ...
173-1 ; 7386236 ; 173 12 ;
Abstract
A method of tightening and a tightening system using the method. The method includes the steps of providing pulse with modulated waveforms from an inverter, driving an AC induction motor by the waveforms in a highspeed low torque mode or a low speed high torque mode or causing the motor to stop, by controlling the inverter to vary the pulse width of the waveforms, and driving a fastening device by the AC induction motor.