Automatic-type fastener driving device
US5829660A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1995 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Dec 7, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25C1/041
- 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 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. A first passage structure communicates 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 such communication. A second passage structure communicates the piston chamber with the secondary valve member. An operative cycle is initiated upon exhausting pilot pressure in the pilot pressure chamber causing the main valve to move to its opened position thereby initiating the fastener drive stroke. A build-up of pressure over the drive piston in the piston chamber communicates with the secondary valve member moving it to its closed position thereby preventing communication between the pilot pressure chamber and th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.