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:
Dec. 03, 1991
Filed:
Jan. 10, 1991
Kunihiko Morita, Koganei, JP;
Nippon Thompson Co., Ltd., Tokyo, JP;
Abstract
A multi-mode splined ball screw assembly includes a first shaft, a hollow second shaft and a hollow third shaft. The first shaft extends into the hollow second shaft and a ball spline structure is provided between the first and second shafts so that they may move relative to each other in the longitudinal direction. The second shaft extends into the third shaft and a ball screw structure is provided between the second and third shafts so that they may rotate relative to each other. The first shaft is rotatably supported by a housing and the third shaft has an outer peripheral surface, a part of which is defined as a ball spline surface section and another part of which is defined as a ball screw surface section. Another ball spline structure is provided between the housing and the ball spline surface section and another ball screw structure is provided between the housing and the ball screw surface section. Thus, the present assembly has a nested structure and can provide a number of different modes of operation.