Strap sealer with fast-acting dual action piston
US6422272B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 4, 2001 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Apr 4, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B13/188
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A strap sealer has a dual action piston. A seal forming assembly is operably connected to the piston. The sealer includes a housing that defines a cylinder and has a penetration therein. A piston is disposed in the cylinder for reciprocating movement. The piston defines upper and lower pressure regions of the cylinder. The sealer includes a compressed air inlet, first and second flow paths between the inlet and the upper and lower pressure regions and a valve assembly for providing flow communication between the inlet to supply air to and exhaust air from the upper and lower pressure regions. A ram is mounted to the piston for reciprocating movement therewith. The ram traverses through the housing penetration. The ram has first and second cross-sectional areas that are different from each other. As the piston reciprocates, the ram traverses through the housing penetration. When the first cross-sectional area resides at the housing penetration a seal is formed and when the second cross-sectional area passes through the housing penetration a vent path is provided from the lower pressure region outwardly to vent air from the lower pressure region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.