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. 20, 1989
Filed:
Mar. 23, 1988
Masayuki Katahira, Maebashi, JP;
Nippon Seiko Co., Ltd., Tokyo, JP;
Abstract
This invention provides a ball screw apparatus complying with high-cleanliness specifications insofar as the apparatus has an axial through hole open at one end of the shaft and a large number of smaller holes on the periphery of the shaft which communicate with the hole, and an air sucking mechanism having a port communicating with the axial hole on the shaft so as to apply a negative pressure to the axial hole thereof. The shaft of this ball screw apparatus acts as a sucking duct so as to allow the use of ordinary grease lubrication even within a clean-room without the necessity of changing lubrication conditions depending on the type of greases. It can effectively prevent contamination of the surrounding area by the forcible sucking of dispersed grease particles, cooling the shaft with the stream of sucked air to prevent faults due to thermal expansion, and is most suitable for a ball screw apparatus of the machines and tools installed in clean-rooms and semiconductor manufacturing plants where dust presents a critical problem.