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:
Feb. 27, 1996
Filed:
Oct. 24, 1994
August Layer, Ohringen, DE;
Hans Rudolf, Sulzbach, DE;
Bernd Grammer, Beilstein, DE;
Heinz Veitinger, Murrhardt, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A method for tightening a screw utilizes a power-impact or pulse driver. The prestressing force in the screw to be tightened is increased step-by-step during the tightening operation and evaluated. By detecting the prestressing force in the screw on a step-by-step basis, the step heights pertaining to the increase in the prestressing force and the change in the step heights are used as criteria for the screw-coupling quality and for controlling the screw-coupling operation. In the same way, the number of impacts or pulses is also used as a criterion for the screw-coupling quality and for controlling the screw-coupling operation.