Shock absorber with improved extension damping
US4132395A · kind A · utility
Inventor
Key dates
| Filing date | Nov 17, 1977 |
| Grant date | Jan 2, 1979 |
| Priority date | — |
| Expiry date | Nov 17, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7927
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A shock absorber, particularly adapted for use in the rear suspension of a motorcycle, comprises a tubular housing having a piston reciprocally mounted therein. A first chamber is defined between the housing and the head end of the piston whereas a second chamber is defined between the rod end of the piston and the housing. An inflatable bladder is disposed in a hollow rod of the piston and defines the third chamber with the rod which is in open communication with the first chamber. The chambers are at least partially filled with oil and the first chamber and bladder are air-pressurized to selectively set the spring rates of the shock absorber. A plurality of circumferentially disposed ports are formed through a head of the piston and are normally closed by a spring washer to prevent communication of oil from the first chamber to the second chamber upon extension of the shock absorber and for permitting such communication upon compression thereof. An orifice is also formed through the head of the piston to meter oil from the second chamber to the first chamber upon extension of the shock absorber. A check valve is also mounted in the head to cooperate with the orifice to also meter…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.