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. 23, 2001
Filed:
May. 28, 1999
Hiroshi Misu, Nara-ken, JP;
Tsubaki Nakashima Co., Ltd., Hyogo-ken, JP;
Abstract
Spacers,each of which has a concave surface,complementary to the spherical surface of a ball,at each end thereof are disposed at areas between the adjacent balls,. A ball circulation mechanism comprises; a through hole,which extends in parallel to an axial line,of the ball nut,inside a thick wall part,of the ball nut,; and adapters,having open ends,provided with tongue portions,for scooping up or returning balls,between a ball screw groove,of a ball shaft,and a ball screw groove,of the ball nut,, and the other open ends,being connected to be in communication with the through hole,, and each adapter being fitted into recesses,provided on both axial ends in the thick wall part,of the ball nut,. Therefore, there is no need of upsizing a ball screw, and thus a compact ball screw which has a high load-carrying capacity and is suitable for a reciprocating movement can be provided.