Microprocessor-controlled hoist system
US4636962A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1983 |
| Grant date | Jan 13, 1987 |
| Priority date | — |
| Expiry date | May 24, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C3/00
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Load position limits and incremental lowering of a load are controlled by a microprocessor forming an interface between an operator's control station and the hoist. Other hoist status conditions such as underspeed and overspeed of the hoist motor are detected by the microprocessor based upon hoist speed during the position limit setting cycle. Still other hoist status data such a motor overheating, number of power-up cycles, number of under and overspeed shut-downs, number of power failures, etc. are input to the microprocessor and all such data as up-dated are entered into a non-volatile memory which, when extracted, permits maintenance scheduling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.