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:
Feb. 26, 1980
Filed:
Jun. 29, 1977
Toshio Yamashita, Chuo-Ku, Tokyo, JP;
Hisashi Kaburagi, Kita-Ku, Tokyo, JP;
Other;
Abstract
The speed reduction means comprises a stationary hollow cylindrical body supporting for rotation about a common axis coaxially arranged rotary input body and rotary output body. A primary set of power transmitting balls is arranged at regular intervals in two mutually shifted rows forming a zig-zag pattern between the power input rotary body and the power output rotary body. A secondary set of power transmitting balls arranged at regular intervals in a single row is disposed between the power output body and the two rows of balls in the primary set. The bearing surface of the power input body defines an eccentric portion which compresses at one point the primary set of balls in radial direction thus displacing the secondary set of balls in axial direction to meander between the two rows of balls. One of the sets of balls is held in a fixed position by the stationary body and the single row in the secondary set includes n balls and each row in the primary set includes n+1 balls so that a speed reduction ratio of 1/(n+1) of the input rotational speed is obtained.