Note: Descriptions are shown in the official language in which they were submitted.
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Mop Head
TECHNICAL FIELD
[0001] The present invention relates to a mop head, and more particularly to a
mop head
with an upper-hole-free concave connecting portion capable of being tightly
connected
with a cleaning member.
BACKGROUND
[0002] Recently, a flat mop has been popular since the flat mop is with merit
of low
height mop head for deeper cleaning and of occupying space saving. In
addition, the
mop strips, i.e., cotton strips, of the flat mop could effective and
convenient work for
cleaning since the flat mop itself could be cleaned in a folded condition.
Therefore, the
flat mop is with merit in cleaning and storing effect. However, with the
popularity of the
flat mop, the advanced assembling method for assembling the mop strips on the
flat mop
head is required.
[0003] One kind of prior known flat mops is a mop head providing with a
plurality of
.. through holes, i.e., a connecting portion having a top opening and a bottom
opening. In
its assembling method for assembling the mop strips on the flat mop head, a
punch is
applied to punch the mop strip through connecting through hole in a vertical
direction in
such a manner that the portion of the mop strips pushed against by the punch,
which is
taken as a punch-in portion, is punched from the bottom opening of the
connecting
through hole and pass through a middle friction part of the connecting through
hole until
the punch-in portion is exposed outside the top opening of the connecting
through hole,
and thereafter a volume of the exposed punch-in portion expands and the punch-
in
portion is then pulled back to pass through the middle friction part to thus
get the middle
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portion of the mop strip stuck by the middle friction part of the through
hole. In one
another assembling method thereof, the exposed punch-in portion is covered on
the top
opening of the connecting through hole after the above assembly.
[0004] However, the above flat mop providing with connecting through holes in
the
vertical direction is with a shortcoming of accumulating dust, dirt or hair
after being
frequently used, especially accumulated in the gap between the exposed punch-
in
portion and the top opening of the connecting through holes. It thus is not
only
unaesthetic but is with flaw that the dust, dirt or hair may be detached from
the gap
while cleaning, or the dust, dirt or hair may drop to a dewater tank while the
mop head is
in rotation cleaning. All of the above are required to be overcome.
[0005] Accordingly, a solution for the above is a mop head frame having a
concave
connecting portion with only a bottom opening but is not with an upper
opening.
However, such concave connecting portion of map head frame without the upper
opening faces a problem that it is difficult to firmly stick the cleaning
member to the
mop head frame in the assembly. The reason is that, upon the requirement that
the
cleaning member needs to get stuck by the middle friction part of the concave
connecting portion, a punch is difficult not to destroy the structure of the
middle friction
part when the punch is pulled back and exits from of the concave connecting
portion.
The problem is an issue to be solved.
SUMMARY
[0006] Accordingly, an objective of the present invention is to provide a
structure of
concave connecting portion with only a bottom opening but is not with a upper
opening
for a flat mop head frame of a mop head, by which the cleaning member could be
firmly
connected to the concave connecting portion.
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[0007] To solve the issues above, the present invention provides a mop head,
comprising:
a mop head frame, which is formed by injection molding through a mold, the
mold has a
plurality of protruding portion by which a plurality of concave connecting
portions are
formed on a bottom surface of the mop head frame, each concave connecting
portion
includes a bottom opening, a closed roof portion, a side wall and a narrow
connecting
portion, wherein an upper surface of the mop head frame seals the mop head
frame to
form the closed roof portion, the side wall is disposed between the bottom
opening and
the closed roof portion, the narrow connecting portion includes a first set of
protruding
elements, a first hollow portion, a second set of protruding elements and a
second hollow
portion in such a manner that, in sequence, the first set of protruding
elements, the first
hollow portion, the second set of protruding elements and the second hollow
portion
surround the side wall thereby enabling the first set of protruding elements
and the
second set of protruding elements, which are formed by injection molding to
extend
from the side wall toward a vertical axis of the concave connecting portion
such that the
first hollow portion is a hollow space neighboring between one side edge of
the first set
of protruding elements and one side edge of the second set of protruding
elements, the
second hollow portion is a hollow space neighboring between another side edge
of the
first set of protruding elements and another side edge of the second set of
protruding
elements, in which the first hollow portion is disposed opposite to the second
hollow
portion, and a concave accommodating portion is formed between the closed roof
portion and the narrow connecting portion, wherein after the injection
molding, the
protruding portion presses against and passes through the first set of
protruding elements
and the second set of protruding elements to compulsively demold from the
concave
connecting portion, and a cleaning member having a punch-in portion, a squeeze-
in
portion and a non-squeeze-in portion, wherein a I-shaped punch presses the
punch-in
portion to enable the I-shaped punch with the width and thickness to pass
through the
first hollow portion and the second hollow portion such that the punch-in
portion and the
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squeeze-in portion are squeezed into the concave accommodating portion, and
then the
I-shaped punch moves in an opposite direction to pass through the first hollow
portion
and the second hollow portion to draw back from the concave connecting
portion.
[0008] According to one embodiment of the present invention, a first hollow
width of the
first hollow portion in the side wall and a second hollow width of the second
hollow
portion in the side wall are both larger than a spacing width between two
neighboring
angular protruding elements which respectively belongs to the first set of
protruding
elements or the second set of protruding elements.
[0009] According to one embodiment of the present invention, the first set of
protruding
elements is a plurality of neighboring angular protruding elements, and the
second set of
protruding elements is a plurality of neighboring angular protruding elements,
and the
plurality of angular protruding element are neighboring formed to surround the
side wall.
[0010] According to one embodiment of the present invention, two sides, in a
radial
direction, of the bottom opening of the first hollow portion are parallel to
two sides, in a
radial direction, of the bottom opening of the second hollow portion.
[0011] According to one embodiment of the present invention, the first set of
protruding
elements are a plurality of protruding elements with a continuous thickness in
a radial
direction of a bottom opening, the second set of protruding elements are a
plurality of
protruding elements with a continuous thickness in a radial direction of a
bottom
opening.
[0012] According to one embodiment of the present invention, a buffering
distance is
formed, in an axial direction of the bottom opening, between the bottom
opening and the
first set of protruding elements and between the bottom opening and the second
set of
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protruding elements.
[0013] The structure of the present invention enables, upon the cleaning
member 2 to be
stuck in the narrow connecting portion 15 of the concave connecting portion
11, the
punch to exit from the concave connecting portion 11 without damaging the
narrow
connecting portion 15, as shown in Fig. 2. As shown in Fig. 6, in the present
invention, a
force, applying to the punch P for enabling the punch P to punch the cleaning
member 2
to the concave connecting portion 11, could be less. Similarly, a force,
applying to the
punch P for enabling the punch P to exit from the concave connecting portion
11 without
affecting the connection between the cleaning member 2 and the narrow
connecting
portion 15, could also be less.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 illustrates a schematic diagram of a mop head mounting on a mop
according to a first embodiment of the present invention;
FIG. 2 illustrates a bottom view of a schematic diagram of a mop head frame
of the mop head according to the embodiment of the present invention;
FIG. 3 illustrates a top view of a schematic diagram of the mop head frame of
the mop head according to the embodiment of the present invention;
FIG. 4a illustrates a bottom view of the mop head frame of the mop head
according to the embodiment of the present invention;
FIG. 4b illustrates a bottom view of a comparison of the size of the mop head
and the size of the punch;
FIG. 5 illustrates a side sectional view of the mop head frame of the mop head
according to the embodiment of the present invention;
FIG. 6 illustrates a side sectional view of a cleaning member being punched
into a concave connecting portion by an I-shaped punch according to the
embodiment of
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the present invention;
FIG. 7 illustrates a side sectional view of the mop head according to the
embodiment of the present invention;
FIG. 8 illustrates a schematic diagram of molds which forms the mop head
according to the embodiment of the present invention;
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0015] The preferred embodiments of the present invention are described in
detail below
with reference to Fig. 1 to Fig. 8. The description is used for explaining the
embodiments of the present invention only, but not for limiting the scope of
the claims.
[0016] Fig. 1 illustrates a mop base B, a mop handle H and a mop head 100
according to
one embodiment of the present invention. The mop head 100 comprises: a mop
head
frame 1 and a cleaning member 2. Specifically, for each of two mop heads 100
of the
present invention, an upper portion of the mop head frame 1, as shown in Fig.
3, is
detachably mounted at a side portion and a bottom portion of the mop base B.
In Fig. 1,
both of the two mop heads are assembled with the mop bases. The mop base B is
connected to the mop handle H to allow the floor mopping. In the present
embodiment,
the cleaning member 2 can be cotton strips. However, the embodiments are not
limit to
this.
[0017] Fig. 2 illustrates a bottom view of a schematic diagram of a mop head
frame 1 of
the mop head 100 according to one embodiment of the present invention. A
bottom
surface 17 of the mop head 100 is formed with a plurality of concave
connecting portion
11. Each of the concave connecting portions 11 comprises a bottom opening 12,
closed
roof portion 13, side wall 14 and narrow connecting portion 15. An end of the
closed
roof portion 13 is sealed by an upper surface 18 of the mop head frame 1. The
side wall
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14 is disposed between the bottom opening 12 and the closed roof portion 13.
In other
word, the concave connecting portion 11 is a recess formed on the bottom
surface 17 of
the mop head frame 1. The recess has a bottom opening 12 as its opening and is
sealed
by the upper surface 18 of the mop head frame 1 as shown in Fig. 3. The side
wall 14 of
.. the concave connecting portion 11 is a cylindrical wall surface. Fig. 3 is
a schematic
diagram of the mop head frame 1 of the mop head 100 according to one
embodiment of
the present invention. The upper surface shown in the Fig. 3 is provided to
connect with
the mop base B as shown in Fig. 1.
[0018] As shown in Fig. 4a, the narrow connecting portion 15 has a first set
of
protruding elements 151, a first hollow portion 152, a second set of
protruding elements
153 and a second hollow portion 154 in such a manner that, in sequence, the
first set of
protruding elements 151, the first hollow portion 152, the second set of
protruding
elements 153 and the second hollow portion 154 surround the side wall 14, as
also
shown in Fig. 2. As shown in Fig. 4a, the first set of protruding elements 151
and the
second set of protruding elements 153 are formed by injection molding to thus
extend
from the side wall 14 toward a vertical axis of the concave connecting portion
11. The
first hollow portion 152 is a hollow space neighboring between one side edge
151a of
the first set of protruding elements 151 and one side edge 153a of the second
set of
protruding elements 153. The second hollow portion 154 is a hollow space
neighboring
between another side edge 151b of the first set of protruding elements 151 and
another
side edge 153b of the second set of protruding elements 153. The first hollow
portion
152 is disposed opposite to the second hollow portion 154. As shown in Fig. 5,
a
concave accommodating portion 16 is formed between the closed roof portion 13
and
the narrow connecting portion 15. The forming method of the concave connecting
portion 11, which has the bottom opening 12, the closed roof portion 13, the
side wall 14
and the narrow connecting portion 15, is achieved as follows and is shown in
Fig. 8.
Two molds M approach to each other. One of the molds has protruding portions
M1 and
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another mold M has corresponding recesses (not shown) corresponding to the
protruding
portions Ml. An outer surface of the protruding portion M1 forms a surface of
the
concave accommodating portion 16. Two molds M approach to each other in such a
manner that the protruding portions M1 of a mold M protrudes into the
corresponding
recesses of another mold M. And then the injection molding is performed
between the
two molds to form the first set of protruding elements 151 and the second set
of
protruding elements 153. After the injection molding, the protruding portions
M1 are
pulled back from the corresponding recesses. Through the pulling back
operation, each
protruding portion M1 is changed from being inserted by the first set of
protruding
elements 151 and the second set of protruding elements 153 to enable the first
set of
protruding elements 151 and the second set of protruding elements 153 to
detach away
from inserting into the protruding portion Ml, and thus the first set of
protruding
elements 151 and the second set of protruding elements 153 are compulsively
demolded
from the protruding portion Ml.
[0019] In Fig. 4b, the mop head 100, according to one embodiment of the
present
invention, a first hollow width W1 of the first hollow portion 152 on the side
wall 14 and
a second hollow width W2 of the second hollow portion 154 on the side wall 14
are both
larger than a spacing width W3, W4 between two neighboring angular protruding
elements 151c, 153c, which respectively belong to the first set of protruding
elements
151 or the second set of protruding elements 153.
[0020] As shown in Fig. 4a, Fig. 4b and Fig. 6, the first hollow width W1 is
equal to the
second hollow width W2. The end of punch P is in I-shaped form whose width W
is
larger than thickness T. In another embodiment, the first hollow width W1 and
the
second hollow width W2 are equal to or larger than the thickness T of the
fitting
I-shaped punch P. A diameter of the side wall 14 is equal to or larger than
the width W
of the I-shaped punch P.
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[0021] In the mop head 100 according to the embodiment of the present
invention as
shown in Fig. 4a, 4b and Fig. 6, the first set of protruding elements 151 is
formed with
four neighboring angular protruding elements 151c. Each angular protruding
element
.. 151c is annularly disposed in adjacent on the side wall 14. And the second
set of
protruding elements 153 is formed with four neighboring angular protruding
elements
153c. Each angular protruding element 153c is annularly disposed in adjacent
on the side
wall 14. Each angular protruding element 151c, 153c is formed with an acute
angle to
pierce into the cleaning member 2 easily so as to stabilize the cleaning
member 2. In
other embodiments, the first set of protruding elements 151 and the second set
of
protruding elements 153 respectively have at least two angular protruding
elements 151c,
153c.
[0022] In the mop head 100 according to the embodiment of the present
invention as
shown in Fig. 4a and Fig. 4b, a lower side of the bottom opening 12 of the
first hollow
portion 152 is parallel to a lower side of the bottom opening 12 of the second
hollow
portion 154. A higher side of the bottom opening 12 of the first hollow
portion 152 is
parallel to a higher side of the bottom opening 12 of the second hollow
portion 154. As
shown in Fig. 5, a buffering distance is formed, in an axial direction of the
bottom
.. opening 12, between the bottom opening 12 and the first set of protruding
elements 151
and between the bottom opening 12 and the second set of protruding elements
153. Thus
when the protruding portion M1 is pulled back from the corresponding concave
accommodating portion 16, the first set of protruding elements 151 and the
second set of
protruding elements 153 would not be separated from the side wall 14.
[0023] In the mop head 100 according to the embodiment of the present
invention as
shown in Fig. 2, Fig. 4a, Fig. 4b and Fig. 5, the first set of protruding
elements 151 are a
plurality of protruding elements. Each protruding element is with a gradient
descent
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thickness in a radial direction of the bottom opening. The second set of
protruding
elements 153 are a plurality of protruding elements. Each protruding element
is with a
gradient descent thickness in a radial direction of a bottom opening 12. In
detail, the
thickness of the protruding elements of the first set of protruding elements
151, i.e. the
.. angular protruding element 151c, and the thickness of the second set of
protruding
elements 153, i.e. the angular protruding element 153c, are gradient descent
from the
side wall 14 to the center. In addition, inner wall surfaces 151d of the first
set of
protruding elements 151 and inner wall surfaces 153d of the second set of
protruding
elements 153 are formed declined from the side wall 14 toward the center to
facilitate
the compulsive demolding for the mold M.
[0024] As shown in Fig. 6 and Fig. 7, the cleaning member 2 has a punch-in
portion 21,
a squeeze-in portion 22 and a non-squeeze-in portion 23. An I-shaped punch P
presses
the punch-in portion 21 to enable the I-shaped punch P with the width W and
thickness
T to pass through the first hollow portion 152 and the second hollow portion
154 such
that the punch-in portion 21 and the squeeze-in portion 22 are squeezed into
the concave
accommodating portion 16, and then the I-shaped punch P is pulled back to move
in an
opposite direction to pass through the first hollow portion 152 and the second
hollow
portion 154 to draw back from the concave connecting portion 11.
[0025] Fig. 6 and Fig. 7 show strips of the cleaning member 2 are inserted.
The first set
of protruding elements 151 and the second set of protruding elements 153 of
the narrow
connecting portion 15 clamp the cleaning member 2. The bent portion of the
strip is a
punch-in portion 21. A portion of the strip in the concave accommodating
portion 16 is a
squeeze-in portion 22. A portion exposed outside the concave accommodating
portion
16 is a non-squeeze-in portion 23 which is for cleaning purpose. The present
invention is
not limited to this. One or a plurality of strip can be squeezed in one
concave
accommodating portion 16.
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[0026] The mop head frame 1 is formed by injection molding through a mold M.
Fig. 7
illustrates the molds for forming the mop head 100 of the present invention.
The mold M
has a plurality of protruding portion M1 by which a plurality of concave
connecting
portions 11 are formed on a bottom surface 17 of the mop head frame 1. The
shape of
recesses at the bottom of the protruding portions M1 corresponds to the shape
of the
angular protruding elements 151c of the first set of protruding elements 151
and the
angular protruding elements 153c of the second set of protruding elements 153.
[0027] The above description should be considered as only the discussion of
the
preferred embodiments of the present invention. A person having ordinary skill
in the art
may make various modifications to the present invention. However, those
modifications
still fall within the spirit of the present invention and the scope defined by
the appended
claims.
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