Cushioned hydraulic lift mechanism with slot in cylinder wall
US5461965A · kind A · utility
23Cited by
22References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1993 |
| Grant date | Oct 31, 1995 |
| Priority date | — |
| Expiry date | Jun 24, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B15/222
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A hydraulically operated piston apparatus including an outer cylinder having an inner telescopically received piston rod. An elongated slot forms a hydraulic fluid outlet through the wall of the cylinder adjacent the closed end of the cylinder. The piston extends from the open end of the cylinder and, in one aspect of the invention, is rigidly secured to an examination chair to provide for vertical adjustment of the chair. One end of the piston is adapted to gradually block the elongated fluid outlet slot to provide for smooth, linear deceleration of the piston to a stop at the end of its stroke.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.