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. 19, 1990
Filed:
Dec. 19, 1988
Karl Nitschmann, Schorndorf, DE;
Werner Hartmann, Ostfildern, DE;
Other;
Abstract
The invention is directed to a saw chain for a motor-driven chain saw equipped with a guide bar and for which lubricating oil is continuously supplied during operation. The oil reaches the guide groove of the guide bar and is directed to the pivotal joints of the saw chain. The oil is taken up by the foot portions of the center links of the saw chain which engage the guide groove. Groove-like channels are provided in a side face of these foot portions via which the lubricating oil is conducted to the pivotal joints. Lubricant pockets are provided in the foot portions of the center links of the saw chain which are supplementary to the channels so that the center links can take along a greater quantity of lubricant. This lubricant then reaches the pivotal joints through the channels especially at the forward end of the guide bar where the saw chain changes direction. This flow of the lubricant to the pivotal joints occurs at the turn-around location because of the centrifugal force which acts on the lubricant as the saw chain moves around the forward end of the guide bar so that an adequate lubrication is assured even at this forward region and also at the lower portion of the turn-around region where the cutting action of the saw chain takes place.