Fluid-powered cylinder
US5692429A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 1995 |
| Grant date | Dec 2, 1997 |
| Priority date | — |
| Expiry date | Oct 18, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B15/22
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A double-acting pneumatic cylinder is characterised by the provision of a pair of sealing elements respectively located on either side of the piston by means of rods slidably mounted in longitudinal bores formed in the piston. At the commencement of the cylinder's in-stroke, the rod and its associated sealing element is in an extended position and serves to seal off the main exhaust port while the piston is still relatively distantly located from the end of its in-stroke. During further in-stroking the piston, air can therefore exhaust only through the auxiliary exhaust port and the motion is thus cushioned. The out-stroke of the cylinder is similarly cushioned over a relatively large distance by virtue of the sealing element adopting an extended position and closing off the main exhaust port, the air exhausting through the auxiliary exhaust port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.