Impact device
US4218888A · kind A · utility
Inventor
Key dates
| Filing date | Feb 12, 1979 |
| Grant date | Aug 26, 1980 |
| Priority date | — |
| Expiry date | Feb 12, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25C1/182
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An automatic impact delivering device or tool of the internal combustion type having a self-contained fuel supply, wherein: PA1 1. valving is an integral function of the piston; PA1 2. a pre-compression chamber and a combustion chamber are provided in the same structure; PA1 3. there is only one major moving part; PA1 4. a spark plug is fired by an ignition means, the ignition means being movable to enable the operator to change the power output of the device by changing the compression ratio of the fuel and air mixture in the combustion chamber; PA1 5. a fuel metering system is an integral part of the piston and cylinder, thus not requiring any additional moving parts; and PA1 6. the device is loaded by a single spring disposed wholly internally thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.