Hydraulic automatically ascending apparatus with a volume-variable oil tank
US4784362A · kind A · utility
Inventor
Key dates
| Filing date | Sep 21, 1987 |
| Grant date | Nov 15, 1988 |
| Priority date | — |
| Expiry date | Sep 21, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C3/30
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic automatically ascending apparatus includes a hydraulic cylinder including a piston and a piston rod which extends from the piston to connect with an article, a volume-variable oil tank, an elastometric body for biasing the oil tank to retract, an oil pipe for intercommunicating with the hydraulic cylinder and the oil tank, and a stop valve mounted in the oil pipe for being manually closed to stop oil flow between the hydraulic cylinder and the oil tank. When the stop valve is opened and when the article is loaded, the article can be descended and thus positioned at a desired position. When the stop valve is opened and when the article is unloaded, the article can be ascended to an upper limit position. A throttle valve is preferably installed within the oil pipe for slowing the movement of the piston rod.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.