Hydraulically-actuatable elevator system
US4066148A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 17, 1976 |
| Grant date | Jan 3, 1978 |
| Priority date | — |
| Expiry date | Mar 17, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B9/04
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Generally described is a hydraulically-actuatable elevator system wherein the vertically reciprocatable cargo-carrying carrier member is suspended from a lofty superstructure by at least one hydraulically-actuatable elongate piston of the casing/plunger type. An electrically powered pump means, having a fluids reservoir co-movably mounted with the carrier, forceably introduces hydraulic fluid along a primary-line into the piston casing thereby decreasing the piston overall length causing the carrier to ascend, and controlled withdrawal of hydraulic fluid from the piston to the reservoir through a secondary-line (provided with an electrically governable checkvalve) allowing the weighty carrier member to descend. An emergency-line communicating between the piston casing and reservoir parallels the secondary-line and bypasses the pump means and the checkvalve and has a normally-closed barrier which is mechanically openable by a carrier passenger whereby the carrier can be made to descend in the contingency of electrical power failure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.