Seal means for a master cylinder
US4685300A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1986 |
| Grant date | Aug 11, 1987 |
| Priority date | — |
| Expiry date | Mar 3, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T11/22
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A master cylinder (10) having a sleeve (24) for positioning first (22) and second (30) seal members within a bore (14) of the housing (12). The first (22) and second (30) members each have a primary seal (52), a retainer (58) and secondary seals (54 or 55). The primary seals (52) have a base member (60), a peripheral ring (64) and a flexible bellows section (66). The retainers (56) have a groove (70) for holding the base member (60), radial slots (74, 74') connect to a source of fluid and either a rib (100) or projection (94) for positioning the secondary seals (54 or 56). First (38) and second (40) pistons which engage the first (30) and second (22) seal members, have communication passages (80, 82) through which the radial slots (74, 74') (75, 75' ) are connected to first (46) and second (42) chamber. In response to an input force, the first (38) and second (40) pistons move into the first (46) and second (42) chambers, respectively, to pressurize fluid therein after interrupting communication through the passages (74, 74') (75, 75'). The fluid pressure acts on the base members (60, 60') to seal the chambers (46, 42) from the source of fluid (23). The sleeve (24) radially expands…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.