Shock-absorbing fluid-actuated fastener installation tool
US4878372A · kind A · utility
36Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1988 |
| Grant date | Nov 7, 1989 |
| Priority date | — |
| Expiry date | Dec 16, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/53748
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A push-pull tool for setting multi-piece fasteners includes a piston that is movable back and forth within a cylinder in response to fluid forces on opposite faces of the piston. One of the fluids is an air-oil foam mixture that acts essentially as an incompressible liquid force-transmitter, while being somewhat compressible so as to absorb shock loadings associated with rapid piston movements. A check valve is included in the system to admit atmospheric air into the air-oil foam mixture, to thereby partially compensate for oil leakage that might inadvertantly take place across the piston seals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.