Resiliently expandable ring seal for combustion chamber of propellant tool
US5749509A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | May 12, 1998 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25C1/082
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A tool for driving a nail or other fastener is actuated by a caseless propellant charge formed of combustible material that is transported into a combustion chamber on a strip. The propellant charge is ignited by striking a sensitizer portion of the charge at an oblique angle. The ignition member intermixes the sensitizer material with an oxidizer layer of the surface of the propellant charge, resulting in combustion of the charge. When ignited, the propellant charge is compressingly interposed between an orifice plate and a movable portion of the combustion chamber. The orifice plate includes a pedestal with an annular compression surface that separates the surface of the ignition area from the remaining surfaces of the charge, insuring that ignition gases are forced through the charge. An annular C-shaped ring is interposed between the orifice plate and the movable portion of the combustion chamber. When the charge is ignited, the resulting gas pressure resiliently expands the annular C-shaped ring and urges opposite axial ends of the C-shaped ring into sealing relationship between the relatively movable components of the combustion chamber. Combustion gases are communicated thro…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.