Trigger valve apparatus for pneumatic tool
US6745928B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2001 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | Mar 31, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25C1/043
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A plunger is shiftable in response to a trigger operation by a user. A valve piston has a valve piston chamber therein for slidably accommodating the plunger and an axial bore into which the plunger is inserted. An air passage connects the valve piston chamber to an atmosphere via a clearance between the plunger and the axial bore of the valve piston. A seal member is provided to seal the clearance between the plunger and the axial bore of the valve piston. And, a relief passage is formed on at least one of the plunger and the axial bore of the valve piston to open the air passage, thereby allowing compressed air to exit from the valve piston chamber to the atmosphere under a condition where the plunger is engaged with the axial bore of the valve piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.