Collapsible filter for a fluid power apparatus
US4961846A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 21, 1989 |
| Grant date | Oct 9, 1990 |
| Priority date | — |
| Expiry date | Jun 21, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T17/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A fluid power apparatus (10) includes a power piston (40) dividing a working chamber (18) from a first chamber (16), the power piston (40) biased toward a rest position by a spring (17) and the piston (40) displaced by means of restricting fluid flow between the working chamber (18) and first chamber (16). In order to keep contaminants from entering the first chamber (16), a collapsible filter (80) is disposed about a piston rod (13) of the power pistion (40), the filter (80) having at an end cap (88) with a central opening (91) through which extends the piston rod (13) and at an opposite end member (98) a flange (95) which serves as a seat (97) for the spring (17). The end member (98) seats sealingly against the power piston (40) while the end cap (88) has a sealing mechanism (92) about the periphery of the central opening (91) to provide sealing between the end cap (88) and input rod (13). If during operation of the fluid power apparatus (10) the end cap (88) should engage an opposite wall (15) of the first chamber (16), the filter (80) collapses and permits continued full stroke displacement of the power piston (40) without damage to the filter (80). Should the filter (80) becom…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.