Fastener driving device having full cycle valve
US5669542A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 1996 |
| Grant date | Sep 23, 1997 |
| Priority date | — |
| Expiry date | May 17, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25C1/043
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A pneumatically operated fastener driving device includes a pilot pressure operated main valve movable from a normally closed position into an opened position closing an exhaust path and allowing a supply of air under pressure to be communicated with a piston chamber to initiate and effect the movement of a piston and fastener driving element through a fastener drive stroke. First passage structure is provided between a pilot pressure chamber and an exhaust port. A secondary valve member is mounted with respect to the first passage structure so as to be movable between an opened position permitting communication between the pilot pressure chamber and the exhaust port and a closed position preventing communication between the pilot pressure chamber and the exhaust port. Second passage structure communicates the piston chamber with the secondary valve member and with the exhaust path. Pressure over the drive piston in the piston chamber communicates with the secondary valve member to move the secondary valve member to its closed position preventing communication between the pilot pressure chamber and the exhaust port thereby causing the main valve to move to its closed position. The …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.