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:
Jun. 02, 2020
Filed:
Dec. 09, 2016
Atlas Copco Industrial Technique Ab, Stockholm, SE;
John Robert Christian Friberg, Nacka, SE;
ATLAS COPCO INDUSTRIAL TECHNIQUE AB, Stockholm, SE;
Abstract
A method for detecting deviations between an actual angular displacement in a screw joint being tightened by an impulse type power wrench and an angular displacement measured between a power wrench housing and an impulse unit of the power wrench, includes determining a first angular interval (Δϕ) between an end point (A) of a first delivered impulse (A) and an end point (B) of a succeeding second delivered impulse (B), determining a second angular interval (Δϕ) between a start point (B) of the second delivered impulse (B) and a start point (C) of a succeeding third delivered impulse (C), comparing (Δϕ) with (Δϕ) to determine a difference between the intervals, and determining that a deviation exists between the actual angular displacement in the screw joint and the angular displacement measured between the power wrench housing and the impulse unit based on the determined difference between the intervals (Δϕand Δϕ).