Filter assembly featuring displaceable filter head plunger for locking into filter cartridge detent
US4915831A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1989 |
| Grant date | Apr 10, 1990 |
| Priority date | — |
| Expiry date | Jan 23, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/17
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
According to the present invention, a locking means is provided for a filter cartridge and head unit. This locking means comprises a spring driven plunger, which preferably is supported by the head and comprises at least one detent, which preferably is disposed in the cartridge in the top wall upper surface thereof, whereby inadvertent disengagement of the cartridge from the head is prevented by engagement of the plunger and the detent, and whereby replacement of the cartridge is permitted by first lifting the plunger before rotating the cartridge through a requisite 90 degrees for disengagement thereof. By using the spring driven plunger and cooperating detent, the problem is avoided of a person, or a child, being able to inadvertently disengage the securing tabs from the securing tab receptacles. Also, in the case of the usual fluid dispensing machine where the head is fixedly attached to the underside of the dispensing machine, the problem of not having a suitable locking means is avoided and no special tools are required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.