Hoist with load shifted gear, detector, and motor speed changer
US5284325A · kind A · utility
21Cited by
16References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1992 |
| Grant date | Feb 8, 1994 |
| Priority date | — |
| Expiry date | Mar 18, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19847
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An electric hoist comprising an electric motor and a sheave driven by the electric motor via a reduction gear. The reduction gear comprises a pair of helical gears meshing with each other. One of the helical gears is axially movably arranged on a shaft and is moved in the axial direction thereof when there is a load on the load chain supported by the sheave, and when the axial movement of the movable helical gear is detected by a sensor, the speed of rotation of the electric motor is automatically changed from a higher speed to a lower speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.