Percussion tool
US4909419A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1988 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Nov 1, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25C1/045
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A percussion tool of the repeatedly operating type includes a housing, a striking cylinder received in the housing for movement therealong, and a driving piston received in the striking cylinder for movement therealong. The striking cylinder cooperates with the housing to provide a switch valve means which is responsive to the movement of the striking cylinder along the housing for selectively interrupting fluid communication between the interior of the striking cylinder and a discharge port and communicating the interior of said striking cylinder with a compressed air source when the striking cylinder is at its lower position to thereby move the striking piston to cause an associated striking driver to strike a driven element and for selectively interrupting the communication between the interior of the striking cylinder and the compressed air source and communicating the interior of the striking cylinder with the discharge port as the striking cylinder is moved from its lower to upper position. Air within that portion of the interior of the striking cylinder between a lower face of the driving piston and a lower end of the striking cylinder is compressed by the striking piston mo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.