Gas separation – Flexible or collapsible bag type – Valved – self-closing – or apparatus contained bag closing means
Patent
1997-01-21
1998-10-13
Bushey, C. Scott
Gas separation
Flexible or collapsible bag type
Valved, self-closing, or apparatus contained bag closing means
55376, 55472, B01D 4602
Patent
active
058206434
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a dust filter bag for a vacuum cleaner, with a retaining plate comprising a solid paper material, such as cardboard for example, to which a dust bag is joined, for example adhesively, with a closure flap turned towards the inside of the dust bag, hinged on the retaining plate, which closure flap is openable against a spring action and, in closed condition, keeps closed an opening in the retaining plate.
A dust filter bag of this type is known through U.S. Pat. No. 2,070,674. The closure flap turned towards the inside of the dust bag, hinged on the retaining plate and keeping the opening closed, hangs on a hinge flap joined to the retaining plate. A sooket provided with hat brim is inserted through the opening. The socket projects in the direction of the blower pipe of the vacuum cleaner and tapers funnel-shaped in that direction. A blower connection piece penetrates self-supportingly into this funnel opening. The hat brim serves, with its surface on the retaining-plate side, to support the socket on the edge of the opening, while the surface turned towards the inside of the dust bag functions as a bearing surface or valve seat surface of the closure flap. The self-closing action of the closure flap is based on the restoring force of an elastic thread freely bridging over the back of the closure flap. The two ends of the elastic thread are clamped in peripheral clamping slots of the base plate. The securing in position of the elastic thread on the closure-flap side is effected by a relief-cut, bent-out retaining tongue. Since the corresponding bending-out leaves behind a consequential relief-cut hole, this dust filter bag is not entirely impervious. When the filled dust bag is taken hold of, air and dust emerge through this hole. This solution is also quite complicated.
A self-closing arrangement for dust filter bags is also known from DE-OS 16 28 582. There, dispensing with special hinge flaps, a diametrically divided closure flap, that is one having two halves (see FIGS. 17 to 19 of this earlier arrangement) is hinged to the base plate, by rabetted lines. The spring action in the closed position is obtained here from two leaf springs aligned transverse to the aforesaid diametrical division, which leaf springs are mounted between the double-layers of the retaining plate and bias the halves. The opening of the closure flap occurs by means of the penetration of the opening in the retaining plate by the blower connecting piece of the vacuum cleaner.
Through DE-OS 40 11 666 it is finally known positively to control the closure flap, again hinged by means of a hinge flap in respect of its closure, of a dust filter bag. In the closed position, however, the closure flap loses its valve function, because it is held pivoted away from the region of the opening, outside of the retaining plate, that is, on the side turned away from the inside of the dust bag. The closure flap, which is guided back in the direction in the opening of the retaining plate upon lateral pulling-away of the retaining plate, is finally pressed into the suitably large opening. It is therefore necessary to arrange an adhesive strip as closure securing means.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a dust filter bag of this type which is simpler in construction and more advantageous as regards use.
As a result of such the arrangement of the invention, dust filter bag improved with regard to construction and use is realised. The above described closure aids in the form of a special elastic spring or the use of leaf springs as spring elements are just as dispensable as is a hinge construction peculiar to the retaining plate. High-quality cardboard may therefore be dispensed with. Also the sealing effect is not impaired; the relief cut is omitted. For this purpose the procedure is that a band-like spring element is arranged on the closure flap in such a way that, in the closed position, a clearance is formed between a band plane and a hinge axis, lying o
REFERENCES:
patent: 2070674 (1937-02-01), Muentener
patent: 2758667 (1956-08-01), Brace
patent: 2864462 (1958-12-01), Brace
patent: 3432998 (1969-03-01), Downey et al.
patent: 3483679 (1969-12-01), Balbierer
patent: 3495386 (1970-02-01), Bixler et al.
patent: 3724179 (1973-04-01), Leinfelt
patent: 5039324 (1991-08-01), Goldberg
patent: 5158635 (1992-10-01), Schmierer et al.
patent: 5468272 (1995-11-01), Schmierer
Kraut-Reinkober Stefan
Lienenluke Paul
Bushey C. Scott
Farber Martin A.
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