Filter/pressure relief assembly for an adhesive supply unit
US5672269A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 29, 1996 |
| Grant date | Sep 30, 1997 |
| Priority date | — |
| Expiry date | Feb 29, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/03
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter and pressure relief assembly for an adhesive supply unit comprises an adhesive supply hopper (12), a filter basket (20) disposed within a cavity (18) defined within a filter block (16), and a filter plug (22) for retaining the filter basket (20) within the filter block (16). Inlet port (32) provides an infeed of adhesive from the hopper (12), an outlet port (36) leads to an applicator, and a return port (54) and conduit (56) return adhesive back to the hopper (12). The filter plug (22) contains a pressure relief valve (44) which opens and connects the inlet port (32) to the return port (54) and conduit (56) so as to return adhesive to the hopper (12) under over-pressurized conditions, and a pair of O-ring members (100, 102) for respectively engaging small and large diameter regions (104, 106) of the cavity (18). A slide plate (66) is movable between three positions (82, 80, 78) and is operatively engaged with the filter plug (22) so as to respectively retain the filter plug (22) at a full retention and a partial retention position within the filter block (16), or permit release of the filter plug (22) and the filter basket (20) from the filter block (16). When the filter b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.