Vacuum extraction apparatus
US4672711A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 29, 1985 |
| Grant date | Jun 16, 1987 |
| Priority date | — |
| Expiry date | Nov 29, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF26B13/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Improved method and apparatus for automatically adjustably sealing the exposed end portions of the vacuum slot of a vacuum extractor pipe of vacuum extraction equipment over which a running length of web material is passed for vacuum removal of materials therefrom, comprising an elongate flexible element anchored at one end in fixed position adjacent the end of the vacuum pipe slot with the element extending inwardly of the end to overlie and sealingly engage the end portion of the slot, and fluid-actuated motor means operatively attached to other end of the flexible element for exerting a pulling force thereon to lift the element from sealing engagement with the end portion of the slot. The fluid-actuated motor is a pneumatic piston operatively connected to the interior of the vacuum extractor pipe so that variations in vacuum in the vacuum extractor pipe proportionally vary the pulling force of the piston on the flexible sealing element to assist in its sealing engagement with the end portion of the vacuum pipe slot up to the side edge of the web passing thereover.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.