Ball-type mechanical transmission
US4199999A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1978 |
| Grant date | Apr 29, 1980 |
| Priority date | — |
| Expiry date | Jul 28, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19786
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A low-friction, light-load, low-cost mechanical transmission for converting rotary motion to linear motion, comprising an elongate screw shaft having a rolled thread groove, a multi-part follower nut comprising a sleeve having a through hole constituting a ball socket and a cylindrical jacket encircling the sleeve, there being a thread-engaging ball disposed in the socket and engaging the walls of the thread groove. The bore of the jacket has a hard surface which engages and provides a back-up for the ball as the latter traverses the length of the screw shaft. The sleeve is held captive within the jacket by a pair of locking rings received in annular grooves in the bore of the latter. Surrounding the nut is a tubular housing. Anti-friction sleeve bearings on the exterior of the jacket slidably engage the inner surface of the housing to enable the nut to move freely therein as the screw shaft is rotatably driven. A tubular connector member is telescopically received in the housing and is immovably secured to the jacket by one of the locking rings which hold the sleeve and jacket assembled. An additional bearing between the housing and connector member maintains the latter centralize…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.