Pressure tube piston unit
US5137124A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 1990 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Sep 18, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/56
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A pressure tube piston unit (10) with a pressure tube (11) which is subdivided into a first working space (14) and a second working space (15) by a piston (12) adapted to be extended and retracted on a piston rod (13). The two working spaces are adapted to be in a lockable flow connection with each other via an externally actuable valve arrangement (18). The piston (12) is radially externally provided with an encircling groove (19) and a packing ring (20) is inserted into the groove. The groove (19) is provided with a radially inwardly directed widened portion, the widening being of a predeterminable height. The packing ring (20) inserted into the bottom of the groove (19) is capable of being displaced axially into the widened portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.