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US4157252A Expired / Lapsed US ⏱️ 0.0 years remaining

Device for forming demonstration cleaning-test bags and for attaching the same to vacuum cleaners

Assignee: Individual
•
Filing: 1976-11-10
•
Granted: 1979-06-05
•
Expires: 1996-11-10
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Abstract

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 cylindrical tube alternately can be attached over the air-intake port (after nozzle removal) to demonstrate sweeper suction strength.

Inventors

  • 👤 Thomas E. Baird

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 00:59
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/14; A47L9/1427

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 133 words
A device for forming a demonstration cleaning-test bag and for attaching it to a vacuum sweeper, comprising: an elongated tubular element including means for attaching one end thereof sealingly to the air-discharge port of a vacuum cleaner, an elongated plunger member insertable axially into the other end of said tubular element for pushing the center of a flexible filter lamina into said tubular element, said plunger having an annular portion of a diameter greater than the diameter of said tubular element and having a circumferentially disposed seat for holding a stretched band positioned for axial movement therefrom over and onto the margin of a filter lamina, when said lamina is folded forwardly over said other end of said tubular element prior to plunger withdrawal, to anchor the bag thus-formed to said tubular element.
Claim 2
Independent Claim 133 words
A device for forming a demonstration cleaning-test bag and for attaching it to a vacuum sweeper, comprising: an elongated tubular element including means for attaching one end thereof sealingly to the air-discharge port of a vacuum cleaner, an elongated plunger member insertable axially into the other end of said tubular element for pushing the center of a flexible filter lamina into said tubular element, said plunger having an annular portion of a diameter greater than the diameter of said tubular element and having a circumferentially disposed seat for holding a stretched band positioned for axial movement therefrom over and onto the margin of a filter lamina, when said lamina is folded forwardly over said other end of said tubular element prior to plunger withdrawal, to anchor the bag thus-formed to said tubular element.
Claim 3
Dependent Claim 28 words
A device according to claim 1, said annular portion additionally including radially extending stop means for engaging said other end of said tubular element to limit plunger penetration.
Claim 4
Dependent Claim 24 words
A device according to claim 2, said annular portion being slidable along said plunger to adjust said device for forming bags of different sizes.
Claim 5
Dependent Claim 25 words
A device according to claim 1, said other end of said tubular element having a circumferential groove near its end to form a band-retaining seat.
Claim 6
Dependent Claim 29 words
A device according to claim 1, said plunger member additionally comprising a truncated-conical handle portion for holding a plurality of said stretched bands behind said seat for sequential use.
Claim 7
Dependent Claim 19 words
A device according to claim 1, said plunger member being hollow to hold a quantity of granular demonstration material.
Claim 8
Dependent Claim 28 words
A device according to claim 6 and additionally comprising a perforated shaker-type member partially closing the chamber in said plunger, and a sealing cover for said perforated member.
Claim 9
Dependent Claim 17 words
A device according to claim 1, said plunger comprising a plurality of telescoping tubes for length adjustment.
Claim 10
Dependent Claim 39 words
A device according to claim 1, wherein the forward end of said plunger has a quickly engageable-and-detachable means for gripping the center of a filter lamina to facilitate its insertion into and its subsequent withdrawal from said tubular element.
Claim 11
Dependent Claim 31 words
A device according to claim 9, said last-mentioned means being a piece of hook-type tape for engagement with a piece of loop-type tape fastened to the center of a filter lamina.

References Cited (Backward Citations)

US1075903A Cited
US2093991A Cited
US2315109A Cited
US3203551A Cited
US3790986A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1982-06-04 1982-12-04 1983-06-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1986-06-04 1986-12-04 1987-06-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1990-06-04 1990-12-04 1991-06-05 $7700.00 Window Closed / Lapsed

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