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:
Nov. 25, 1980
Filed:
Mar. 26, 1979
Applicant:
Inventor:
Manfred Ackermann, Elmhurst, IL (US);
Assignee:
Union Special Corporation, Chicago, IL (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D05B / ; B65H / ;
U.S. Cl.
CPC ...
112229 ;
Abstract
A bobbin thread tension for a closed end cylindrical body bobbin thread case of a horizontal axis type rotary hook for a lockstitch sewing machine consisting of a diagonally slotted thread aperture in the wall of the bobbin case partially covered by a bobbin thread control that is adjustably mounted on the wall of the bobbin case by a pivot screw at one of its ends and inward a clamp screw passing through an enlarged hole in the bobbin thread control allowing the control to be pivoted to cover an effective amount of the thread aperture thereby increasing or decreasing the bobbin thread tension.