Mounting collar for a filter bag

Details Mounting collar for a filter bag Mounting collar for a filter bag

2002-04-02

2004-04-06

Pham, Minh-Chau T. (Department: 1724)

Gas separation

Flexible or collapsible bag type

Closure means other than coupler to flow line for filter or...

C055S361000, C055S374000, C055S375000, C055S377000, C055S378000, C055SDIG002, C055SDIG003, C015S347000

Reexamination Certificate

active

06716262

ABSTRACT:

BACKGROUND
A filter bag collects debris that is removed from household surfaces by a vacuum cleaner. The filter bag has a mounting collar with an opening that provides access to the interior of the bag. The bag is removably mounted on a vacuum cleaner fill tube by insertion of the fill tube through the opening in the collar.
A prior art mounting collar
10
is shown in
FIG. 1A
adjacent a section of a vacuum cleaner fill tube
11
. The collar
10
has a rigid frame
12
with an inner edge
14
defining an opening
16
. The inner edge
14
defines a circle that is interrupted by the top and bottom ends
18
and
20
of a tab
22
that extends across the opening
16
. The bottom end
20
of the tab
22
is narrow and thus easily torn away from the frame
14
. An elastomeric diaphragm
24
located behind the tab
22
extends across the opening
16
. The diaphragm
24
has a slit
26
in the shape of a figure eight, as shown in FIG.
1
B.
The fill tube
11
can be inserted through the opening
16
of the frame
12
and through the slit
26
in the diaphragm
24
. In this process, the tube
11
tears the bottom end
20
of the tab
22
away from the frame
12
. The tab
22
, pivoting about its top end
18
, is pushed through the slit
26
of the diaphragm
24
along with the tube
11
. As shown in
FIG. 2
, the diaphragm
24
is elastically engaged about the tube
11
. The tab
22
is lodged in-between the tube
11
and the diaphragm
24
.
SUMMARY
The present invention is a mounting collar for supporting a vacuum cleaner filter bag in a mounted condition over a vacuum cleaner fill tube. The fill tube has a cylindrical outer surface. A panel of the mounting collar is configured to be attached to the filter bag. The panel has a first inner edge defining a first opening for receiving the fill tube. An elastomeric diaphragm of the collar extends across the first opening. The diaphragm has a second inner edge defining a second opening. The second inner edge is configured to be elastically stretched circumferentially about the fill tube and to be in contact with the cylindrical outer surface about the entire circumference of the cylindrical outer surface when the first opening receives the fill tube. A lobe of the diaphragm is defined by the second inner edge and a baseline. The baseline extends from a first point on the second inner edge to a second point on the second inner edge and is located entirely on the diaphragm.
In an embodiment of the invention, the lobe is defined by a section of the second inner edge and the baseline, and the section is arcuate. The distance between any two points on the inner edge is less than the diameter of the fill tube. An infinite line containing the baseline does not extend across the second opening, and the height of the lobe is shorter than the length of the baseline in an original condition of the diaphragm. The entire area of the lobe is stretched and elastically pressed against the tube when the first opening receives the fill tube.
Preferably, the second opening includes a slit. The slit is defined by two sections of the edge that engage each other along their lengths in the original condition of the diaphragm. Two opposite ends of the slit are the most distantly separated locations on the slit. An infinite line containing the baseline does not extend across the second opening, and the slit does not extend into the lobe.


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