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:
Mar. 27, 1979
Filed:
Jan. 12, 1978
Kurt Klundt, Hirschhorn, DE;
Abstract
A sewing machine having a rotatable main shaft connected to a needle to reciprocate it includes an impeller or air fan which has a hub portion which is connectable to the main shaft of the sewing machine for rotation thereby. The impeller housing also includes a plurality of radially extending fans defining air flow passages therebetween and a central axially extending tubular inlet forming the inlet for inward axial flow and then radial outward flow and peripheral discharge for circulation of the air through a cooling chamber defined in the sewing machine below the oil pan housing part. The impeller also includes an exterior groove around the tubular part which defines a pulley for a V-belt so that the impeller may function as a drive for the shaft. In addition, a hand wheel is secured around the periphery of the tubular part to facilitate hand rotation of the shaft. The hand wheel advantageously includes an opening aligned with the opening of the impeller for the inflow of air therethrough.