Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Reexamination Certificate
1999-09-08
2001-06-12
Morris, Terrel (Department: 1771)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
C428S141000, C428S156000, C428S192000, C428S195100, C442S381000, C442S400000, C442S401000, C019S262000, C015S209100
Reexamination Certificate
active
06245413
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a disposable cleaning sheet for attachment to a cleaning mop or the like, for wiping dust from a surface to be cleaned such as floor, and more particularly to a cleaning sheet which has its dust collecting ability enhanced by making it possible to use the whole wiping area of the cleaning sheet efficiently.
BACKGROUND OF THE INVENTION
In general, the “disposable cleaning sheet” collects dust by making use of complicatedly entangled fibers on its surface, and during use is attached, for example, to a plate with a flat bottom face which is provided at the leading end of a cleaning mop.
In the above case of attaching the cleaning sheet to a mop in order to perform a wiping operation, a problem arises due to the flat bottom face of the plate. Specifically, the cleaning sheet can not readily collect the dust at its middle region, which covers the center of the bottom face of the plate while collecting the dust at its peripheral edge regions covering the edge portions of the plate. As a result, the entire cleaning sheet cannot be effectively exploited.
FIG. 8
is a side section showing a prior art cleaning sheet for eliminating the aforementioned defect while attached to a cleaning mop;
FIG. 9
is a side section showing another prior art cleaning mop for eliminating the aforementioned defect while having a cleaning sheet attached thereto; and
FIG. 10
is a side section showing the cleaning sheet of the prior art shown in
FIG. 8
in actual use.
The cleaning sheet, as shown in
FIG. 8
, belongs to the same kind as that disclosed in Unexamined Published Japanese Patent Application No. 10-5163, for example. A sheet
31
is made thicker at its middle region
31
a
than the peripheral edge regions
31
b
and
31
b
. When this sheet
31
is attached to a cleaning mop M or the like, the middle region
31
a
is positioned at the central region of a plate Mp of the cleaning mop M. When a surface to be cleaned such as a floor is cleaned with that sheet
31
, the middle region
31
a
comes into abutment against the surface to be cleaned while forming an indented space
32
a
between the peripheral edge region
31
b
and the surface to be cleaned. By moving the cleaning mop M along the surface to be cleaned to perform the wiping operation, a relatively large piece of dust can be collected in the indented space
32
a
to enhance the dust collecting effect.
In the prior art device shown in
FIG. 9
, unlike that shown in
FIG. 8
, the bottom face of the plate Mp of the cleaning mop M itself is formed into a bulging shape to form indented spaces
32
b
and
32
b
between a central portion M1 and edge portions M2 and M2, respectively. When the wiping operation is performed with the bottom face (including the central portion M1, the indented spaces
32
b
and the edge portions M2) of the cleaning mop M covered with a flat cleaning sheet (or a flat sheet)
31
′, the relatively large piece of dust can be collected in the indented spaces
32
b.
However, the prior art thus far described suffers from the following problems. In the prior art shown in
FIGS. 8
or
9
, either the area of the middle region
31
a
of the cleaning sheet
31
or the area (i.e., the area of the cleaning sheet
31
′ in contact with the surface to be cleaned) of the central portion M1 of the cleaning mop M is smaller than the entire area of the bottom face of the cleaning mop M. As a result, the cleaning mop M is liable to become unstable with respect to the surface to be cleaned. For example, the frictional force acting upon the cleaning mop M when the cleaning mop M is moved in a direction X along the surface to be cleaned is liable to incline the plate Mp with respect to the surface to be cleaned, as shown in FIG.
10
. In this state in which the plate Mp of the cleaning mop M takes the inclined position, the cleaning mop M cannot be smoothly moved with respect to the surface to be cleaned during the wiping operation.
In the aforementioned structure, furthermore, the dust collecting effect is enhanced by trapping a relatively large piece of dust in the indented spaces
32
a
or
32
b
. If the cleaning mop M is moved in the inclined position, however, an end of the peripheral edge portion
31
b
of the sheet
31
, as shown in
FIG. 8
, or the edge portion M2 of the cleaning mop M, as shown in
FIG. 9
, comes into contact with the surface to be cleaned. As a result, the leading side of the indented space
32
a
or
32
b
in the direction of movement (i.e., the direction X) of the cleaning mop M becomes closed. This prevents the entrance of dust into the indented space
32
a
or
32
b
and raises the problem that the dust collecting effect is not sufficiently achieved.
SUMMARY OF THE INVENTION
The present invention solves the aforementioned problems in the prior art and has an object to provide a cleaning sheet enabling collecting dust in a stable position while enhancing the dust collecting ability.
The present invention provides a cleaning sheet which is to be attached to a cleaning tool during use, the cleaning sheet comprising a wiping region having a wiping layer and attaching regions positioned on both sides of the wiping region, wherein
a plurality of recesses are formed at intervals along boundaries between the wiping region and the attaching regions such that the recesses extend from the boundaries toward the center of said wiping region.
With this invention, when the cleaning sheet is attached to the cleaning tool (a cleaning mop, for example), the recesses can trap a relatively large piece of dust and guide fine dust particles to the center of the wiping region while preventing the cleaning sheet from inclining with respect to a surface to be cleaned (the floor, for example).
REFERENCES:
patent: 4298649 (1981-11-01), Meitner
patent: 5962112 (1999-10-01), Haynes et al.
patent: 6013349 (2000-01-01), Takeuchi et al.
patent: 6143393 (2000-11-01), Abe et al.
patent: 05192284 (1993-08-01), None
patent: 05245090 (1993-09-01), None
patent: 0774229A2 (1997-05-01), None
patent: 0777997A2 (1997-06-01), None
patent: 10005163 (1998-01-01), None
patent: 0777997A3 (1998-01-01), None
patent: 0774229A3 (1998-04-01), None
patent: 0865755A1 (1998-09-01), None
patent: 0943425A1 (1999-09-01), None
patent: 05245090 (1993-09-01), None
patent: 09149873 (1997-06-01), None
Fujiwara Masatoshi
Kenmochi Yasuhiko
Tanaka Yoshinori
Darby & Darby
Morris Terrel
Torres Norca L.
Uni-Charm Corporation
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