Geared elevator system
US5433294A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 18, 1994 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | May 18, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B11/0446
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A geared traction elevator includes a worm shaft, supported by a pair of tapered roller bearings in a gear box housing, one end of which projects out of an opening in the gear box housing and is coupled to the motor. The motor end bearing assembly is secured against axial movement by a retainer ring, which is secured in a groove in the gear box housing, and the motor end of the worm shaft is sealed by a dynamic seal, also secured in the housing. A cap bears against the bearings at the other end of the shaft, to pre-load the bearings to a predetermine level. In this manner, the dynamic seal may be replaced without affecting the pre-load setting. Preferably, the bearings are disposed in openings at opposite ends of the gear box housing which are large enough to allow the worm shaft to be removed through either end. The arrangement simplifies the manufacture of the gear box, and reduces the time and parts necessary to replace the dynamic seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.