Oil cylinder for a stand carriage
US5887431A · kind A · utility
Inventor
Key dates
| Filing date | Nov 6, 1997 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Nov 6, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/1415
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An oil cylinder has a valve body, an oil pressure chamber, and an oil storage chamber. A shaft extends from the oil pressure chamber. The valve body has a piston chamber, an arc-shaped through hole, an enlarged hole receiving a rotating post, a first oil passage, a second oil passage, a third oil passage, a fourth oil passage, an oil hole, a first channel, and a second channel. A piston is disposed in the piston chamber. A trip lever passes through the arc-shaped through hole. The trip lever is connected to the rotating post. A big ball is placed in the third oil passage. A small ball is placed in the second oil passage. A compression spring is connected to the bolt and the big ball. A coiled spring is connected to the big ball and the small ball. A swivel rod is connected to the rotating post. A V-ring oil seal encloses the piston. An oil relief device is disposed on the valve body and inserted in the first channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.