Hydraulic drive for operating an elevator
US3965802A · kind A · utility
Inventor
Key dates
| Filing date | Nov 26, 1973 |
| Grant date | Jun 29, 1976 |
| Priority date | — |
| Expiry date | Nov 26, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/20444
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A hydraulic drive for operating an elevator and disposed inside the elevator shaft on one side of the load-lifting member of the elevator comprises a hydraulic ram cylinder having two straight cylinder portions connected by a portion forming an arcuate bend. One straight cylinder portion extends up the path of ascent of the load-lifting member of the elevator, whereas the other straight cylinder portion slidably contains a hydraulic ram piston attached to one end of a universally flexible thrust-transmitting strand. The other end of the flexible strand is attached to a cylindrical body arranged to slide up and down said one straight cylinder portion and is provided with a carrier arm projecting to the outside through an axial slot in said one straight cylinder portion for supporting the load-lifting member of the elevator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.