Air filtration bag replacement device
US4277874A · kind A · utility
Inventors
Key dates
| Filing date | Sep 17, 1979 |
| Grant date | Jul 14, 1981 |
| Priority date | — |
| Expiry date | Sep 17, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/53657
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Apparatus for facilitating the insertion of a cylindrical frame into a filter bag used for collecting airborne particulate matter is disclosed. A cylindrical member is provided which has an axial discontinuity in its sidewalls. The outer diameter of the cylindrical member is at least equal to the inner diameter of the mouth of the bag. The inner diameter of the cylindrical member is no less than the outer diameter of the frame. A device is provided for drawing the sidewalls of the cylindrical member together at the discontinuity so that the outer diameter of the cylindrical member is decreased to slightly less than the inner diameter of the mouth of the bag. The mouth of the bag is then inserted over the end of the cylindrical member, which is released to capture the mouth of the bag. With the mouth of the bag held open by the apparatus of the present invention, the frame can readily be inserted through the other end of the cylindrical member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.