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. 15, 1979
Filed:
Jan. 05, 1978
Kurt Klundt, Hirschhorn, DE;
Abstract
The sewing machine includes a drive shaft which is rotatably mounted in a housing and is connected to a needle to reciprocate the needle at a stitching area in order to effect sewing of material. A fan blade or impeller is affixed to the main shaft for rotation therewith, and it rotates in a chamber in the housing and is constructed with a central inlet opening to pull in air centrally and to discharge it radially downwardly into a lower extension below the oil pan of the sewing machine. The lower extension includes a plurality of ribs extending downwardly from the bottom wall of the oil pan which forms heat exchanger surfaces over which air from the blower is directed. The heat exchange surfaces are arranged in the form of longitudinally extending ribs which extend substantially parallel to the shaft and they define air flow channels therebetween.