Device for forming demonstration cleaning-test bags and for attaching the same to vacuum cleaners
US4157252A · kind A · utility
Inventor
Key dates
| Filing date | Nov 10, 1976 |
| Grant date | Jun 5, 1979 |
| Priority date | — |
| Expiry date | Nov 10, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47L9/00
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A device for forming demonstration cleaning-test bags and for attaching them to vacuum cleaners comprises basically a cylindrical tube adapted for placement over the air-discharge port of a sweeper, and a co-operating plunger for pushing the central area of a flexible filter cloth or sheet into the tube. The end of the plunger has fixed thereto a hook-type VELCRO disc for engagement with a co-operating loop-type VELCRO disc cemented or stitched centrally of the filter sheet. Thus the inserted sheet can be turned inside-out to form a bag but after the sheet margin has been anchored to the outer lip surface of the cylindrical tube by a contracting coil-spring band which is rolled thereover from an annular plunger seat encircling said lip. For adjustment to different sizes of bag-forming sheets, the band-holding plunger-seat can be slidable along the plunger, or the plunger body can be length-adjustably formed from telescoping sections. The plunger handle can be of truncated conical shape to hold a plurality of contractable bands. The plunger body is desirably hollow to hold a quantity of sand, salt, etc., for sprinkling onto a rug as a part of the cleaning demonstration. The cylindri…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.