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:
Jan. 18, 1983
Filed:
Dec. 01, 1980
Kouichi Okamoto, Kobe, JP;
Masaki Sakuyama, Ashiya, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A shaft sealing device stable in sealing effect and which causes no seal breakdown is provided by changing the groove depth of a thread cut in a rotary shaft in the axial direction in such a manner that the groove depth of the thread on the high liquid pressure side is larger than that on the low liquid pressure side. In one embodiment, the groove depth on the high pressure side is larger than on the low pressure side of the thread with the groove depth varying continuously from the high pressure side to the low pressure side. In another embodiment, the groove depth is constant in a portion of the shaft on the low pressure side and decreases towards the low pressure in a portion of the shaft on the high pressure side.