U.S. patent application number 12/611544 was filed with the patent office on 2010-05-06 for electric vacuum cleaner.
Invention is credited to Tatsuo Kikkawa, Toru Odachi.
Application Number | 20100107357 12/611544 |
Document ID | / |
Family ID | 42129675 |
Filed Date | 2010-05-06 |
United States Patent
Application |
20100107357 |
Kind Code |
A1 |
Odachi; Toru ; et
al. |
May 6, 2010 |
ELECTRIC VACUUM CLEANER
Abstract
Provided are rotary brush unit which is disposed inside suction
port portion and in which two rotary shaft bodies each having brush
are disposed in series and driving motor which separately rotates
each of the rotary shaft bodies. With such a configuration, since
it is possible to change a self-propelling direction of the suction
port portion to the left and right direction in addition to the
forward direction, it is possible to remarkably reduce the effort
involved in an operation of changing the direction of the suction
port portion.
Inventors: |
Odachi; Toru; (Shiga,
JP) ; Kikkawa; Tatsuo; (Shiga, JP) |
Correspondence
Address: |
Brinks Hofer Gilson & Lione/Panasonic
P.O. Box 10395
Chicago
IL
60610
US
|
Family ID: |
42129675 |
Appl. No.: |
12/611544 |
Filed: |
November 3, 2009 |
Current U.S.
Class: |
15/389 |
Current CPC
Class: |
A47L 9/0411
20130101 |
Class at
Publication: |
15/389 |
International
Class: |
A47L 5/26 20060101
A47L005/26 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 4, 2008 |
JP |
2008-282714 |
Claims
1. An electric vacuum cleaner comprising: a cleaner body portion
which has an electric blower for generating a suction wind; a
suction port portion which sucks dust together with the suction
wind; a handle portion which moves the suction port portion; a
rotary brush unit which is disposed inside the suction port portion
and in which two rotary shaft bodies each having a brush are
disposed in series; a rotary brush unit driving portion which
separately rotates each of the rotary shaft bodies; and a rotation
speed difference generating mechanism which generates a difference
in the rotation speed between the two rotary shaft bodies.
2. The electric vacuum cleaner of claim 1, wherein the suction port
portion propels itself in accordance with the rotation of the
rotary shaft bodies.
3. The electric vacuum cleaner of claim 1, wherein the rotary brush
unit driving portion is configured as a driving motor which is
disposed inside each of the rotary shaft bodies.
4. The electric vacuum cleaner of claim 1, wherein the handle
portion includes a switch lever portion which is operable in the
left and right direction, and controls the rotation of the two
rotary shaft bodies of the rotary brush unit so that a direction of
the suction port portion is changed to the operation direction of
the switch lever portion.
5. The electric vacuum cleaner of claim 1, wherein the handle
portion is twistable in the left and right direction, and wherein
when the handle portion is twisted in the left and right direction,
the rotation of the two rotary shaft bodies of the rotary brush
unit is controlled so that a direction of the suction port portion
is changed to the twisting direction of the handle portion.
6. The electric vacuum cleaner of claim 1, wherein stiffness of
each of the brushes in the vicinity of both ends of the rotary
brush unit is set to be harder than that in the vicinity of the
center thereof.
7. The electric vacuum cleaner of claim 1, wherein an outer
diameter of each of the rotary shaft bodies at both ends of the
rotary brush unit is set to be larger than that in the vicinity of
the center, wherein a length of each of the brushes in the vicinity
of both ends of the rotary brush unit is set to be shorter than
that in the vicinity of the center thereof, and wherein an outer
diameter of each of the brushes up to the end of its bristles in
the vicinity of both ends of the rotary brush unit is set to be
same as that in the vicinity of the center thereof
8. The electric vacuum cleaner of claim 1, wherein a length of each
of the brushes in the vicinity of both ends of the rotary brush
unit is set to be longer than that in the vicinity of the center
thereof.
9. The electric vacuum cleaner of claim 1, wherein a density of
each of the brushes in the vicinity of both ends of the rotary
brush unit is set to be higher than that in the vicinity of the
center thereof.
10. The electric vacuum cleaner of claim 9, wherein the brushes of
the rotary shaft bodies are formed in a comb tooth shape, and a
pitch of the comb tooth shape of each of the brushes in the
vicinity of both ends of the rotary brush unit is set to be
narrower than that in the vicinity of the center thereof.
11. The electric vacuum cleaner of claim 9, wherein the brushes of
the rotary shaft bodies are formed in a stripe shape, and the
number of lines of the brushes in the vicinity of both ends of the
rotary brush unit is set to be larger than that in the vicinity of
the center thereof.
Description
RELATED APPLICATIONS
[0001] This application claims priority under 35 U.S.C. .sctn.119
to Japanese Patent Application No. JP2008-282714 filed on Nov. 4,
2008, the entire content of which is hereby incorporated by
reference.
TECHNICAL FIELD
[0002] The present invention relates to an electric vacuum cleaner
having a suction port portion and a handle portion.
BACKGROUND ART
[0003] In an existing electric vacuum cleaner, dust collecting
performance using a sweeping-up rotary brush is good in regards to
a floor surface and particularly a carpet surface. However, since
the electric vacuum cleaner is equipped with a motor for driving
the rotary brush, it is disadvantageous in that the suction port
portion easily becomes heavy and the cleaning operation is
wearisome. In order to solve the disadvantage, for example,
Japanese Patent Unexamined Publication No. 2-7923 discloses a
technology in which a suction port portion is provided with a
self-propelling roller or a rotary brush itself is actively brought
into contact with a floor surface so as to have a self-propelling
property.
[0004] However, in the above-described technology, it is possible
to reduce the effort upon operating the suction port portion
forward or backward, but it is necessary to change a direction of
the suction port portion by twisting a wrist upon changing the
direction in the left and right direction. For this reason, it is
not possible to reduce the effort involved. Particularly, in an
upright cleaner having a heavy suction port portion, it takes a
good deal of effort to change the direction of the suction port
portion. Since the direction of the suction port portion is
frequently changed during an actual cleaning operation,
particularly at this time, a large burden is applied to the wrist.
As a result, the wrist feels fatigued after a long-time cleaning
operation.
SUMMARY OF THE INVENTION
[0005] An object of the invention is to provide an electric vacuum
cleaner capable of changing a direction of a suction port portion
to a desired changing direction and reducing the burden applied to
a user's wrist.
[0006] According to an aspect of the invention, there is provided
an electric vacuum cleaner including: a cleaner body portion which
has an electric blower for generating a suction wind; a suction
port portion which sucks dust together with the suction wind; a
handle portion which moves the suction port portion; a rotary brush
unit which is disposed inside the suction port portion and in which
two rotary shaft bodies each having a brush are disposed in series;
a rotary brush unit driving portion which separately rotates each
of the rotary shaft bodies; and a rotation speed difference
generating mechanism which generates a difference in the rotation
speed between two rotary shaft bodies.
[0007] According to the invention, the rotary brush unit includes
two rotary shaft bodies, and the rotation speed difference
generating mechanism generates a difference in the rotation speed
between two rotary shaft bodies. For this reason, it is possible to
easily change the direction of the suction port portion to the
desired changing direction. Accordingly, since it is possible to
remarkably reduce a burden during a cleaning operation, it is
possible to more comfortably perform the cleaning operation which
is a comparatively heavy labor in the housework.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 is an entire perspective view showing a cleaner body
portion of an electric vacuum cleaner according to a first
embodiment of the invention.
[0009] FIG. 2 is a partially sectional view showing a suction port
portion according to the embodiment.
[0010] FIG. 3 is a block diagram showing a configuration of an
electric controller according to the embodiment.
[0011] FIG. 4 is an entire perspective view showing the cleaner
body portion of the electric vacuum cleaner according to a second
embodiment of the invention.
[0012] FIG. 5 is a plan view showing a rotary brush unit of the
electric vacuum cleaner according to a third embodiment of the
invention.
[0013] FIG. 6 is a plan view showing the rotary brush unit of the
electric vacuum cleaner according to a fourth embodiment of the
invention.
[0014] FIG. 7 is a plan view showing the rotary brush unit of the
electric vacuum cleaner according to a fifth embodiment of the
invention.
[0015] FIG. 8 is a plan view showing the rotary brush unit of the
electric vacuum cleaner according to a sixth embodiment of the
invention.
[0016] FIG. 9 is a plan view showing the rotary brush unit of the
electric vacuum cleaner according to a seventh embodiment of the
invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0017] Hereinafter, exemplary embodiments of the invention will be
described with reference to the accompanying drawings. In addition,
the invention is not limited to the embodiments.
First Embodiment
[0018] FIG. 1 is an entire perspective view showing a cleaner body
portion of an electric vacuum cleaner according to a first
embodiment of the invention. FIG. 2 is a partially sectional view
showing a suction port portion according to the embodiment when
seen from the bottom of the suction port portion.
[0019] As shown in FIG. 1, an electric vacuum cleaner according to
this embodiment includes suction port portion 1 which sucks dust,
handle portion 11 which moves suction port portion 1, and cleaner
body portion 12 of which a lower portion is provided with suction
port portion 1 and an upper portion is provided with handle portion
11. Cleaner body portion 12 includes an electric blower for
generating a suction wind. Suction port portion 1 sucks dust
together with the suction wind generated by the electric blower.
Switch lever portion 10 is attached onto handle portion 11. Switch
lever portion 10 is attached to a position where switch lever
portion 10 is operable by a finger when gripping handle portion 11
using a hand. When switch lever portion 10 is pushed down in the
left and right direction, as depicted by the arrow, suction port
portion 1 is controlled so that the direction thereof is changed to
the direction in which switch lever portion 10 is pushed down.
[0020] As shown in FIG. 2, rotary brush unit 2 is disposed inside
suction port portion 1. Rotary brush unit 2 includes two rotary
shaft bodies 2A and 2B. Brush 3 is disposed in surfaces of rotary
shaft bodies 2A and 2B.
[0021] In FIG. 2, brush 3 is formed as a so-called bristle
transplant brush in which bristles are tied and transplanted inside
a hole, but may be formed as a brush in which a narrow raised
fabric is inserted and fixed into an undercut groove or a bonded
brush.
[0022] Each of the rotary shaft bodies 2A and 2B is provided with
driving motor 4 and decelerating gear 5. Driving motor 4 is
connected to decelerating gear 5 to thereby form a rotary brush
unit driving portion. An output shaft of decelerating gear 5 is
fixed to each of rotary shaft bodies 2A and 2B. With such a
configuration, when driving motors 4 are driven, rotary shaft
bodies 2A and 2B located in the peripheries thereof rotate.
[0023] Likewise, a rotary mechanism is constituted by only rotary
brush unit 2 in such a manner that driving motor 4 and decelerating
gear 5 are disposed inside each of rotary shaft bodies 2A and 2B.
Accordingly, it is not necessary to dispose a large component such
as a driving motor in the inside of suction port portion 1. For
this reason, it is possible to decrease the size of suction port
portion 1. That is, it is possible to realize suction port portion
1 which can move and turn slightly and has good operability or
cleaner body portion 12 which is small in size and low in
weight.
[0024] The length of brush 3 is set to a length at which brush 3
slightly comes into contact with a floor surface. For this reason,
when rotary shaft bodies 2A and 2B rotate in a direction (positive
direction) in which suction port portion 1 is pushed forward,
suction port portion 1 propels itself, thereby improving the
operability of cleaner body portion 12. That is, when driving
motors 4 inside rotary shaft bodies 2A and 2B rotate at the same
speed (including substantially the same speed) in the same
direction (positive direction), suction port portion 1 propels
itself forward.
[0025] In addition, each of rotary shaft bodies 2A and 2B is driven
by a separate driving motor 4. For this reason, it is possible to
independently change the rotation speeds thereof. When the right
driving motor on the user side rotates faster than the left driving
motor or only the right driving motor rotates, a direction of
suction port portion 1 is changed to the left direction. On the
other hand, when the left driving motor rotates faster than the
right driving motor or only the left driving motor rotates, the
direction of suction port portion 1 is changed to the right
direction.
[0026] In addition, when the driving motor located in the desired
rotation direction rotates in the reverse direction and the
opposite driving motor rotates in the positive direction, it is
possible to further strongly change the direction of suction port
portion 1.
[0027] Switch lever portion 10 controls driving motors 4 inside
rotary shaft bodies 2A and 2B through the electric controller shown
in FIG. 3. FIG. 3 is a block diagram showing a circuit of the
electric vacuum cleaner according to this embodiment. In FIG. 3,
motor 35 for driving the electric blower generating the suction
wind is connected in parallel to AC power source 36. Power switch
portion 37 controlling an on-off state of motor 35 is disposed
close to handle portion 11 of cleaner body portion 12 (not shown in
FIG. 1). Driving motor 38A (one driving motor 4 shown in FIG. 2)
for driving rotary shaft body 2A is connected in series to rotary
shaft body switch portion 39A for controlling the on-off state of
driving motor 38A. In the same manner, driving motor 38B (the other
driving motor 4 shown in FIG. 2) for driving rotary shaft body 2B
is connected in series to rotary shaft body switch portion 39B for
controlling an on-off state of driving motor 38B. The two serial
connection portions are connected in parallel to motor 35. Rotary
shaft body switch portions 39A and 39B are operated in an
interlocking manner as depicted by the dotted line by switch lever
portion 10.
[0028] In the normal state where no operation is performed, switch
lever portion 10 turns on rotary shaft body switch portions 39A and
39B, and rotates driving motors 38A and 38B at the same speed in
the same direction (positive direction). Accordingly, suction port
portion 1 propels itself forward. When switch lever portion 10 is
pushed down in the left and right direction, as described above,
switch lever portion 10 controls driving motors 38A and 38B inside
rotary shaft bodies 2A and 2B so that the direction of suction port
portion 1 is changed to the direction in which switch lever portion
10 is pushed down.
[0029] That is, when switch lever portion 10 is pushed down in the
right direction, only left driving motor 38B on the user side
rotates in the positive direction. For this reason, it is possible
to easily change the direction of suction port portion 1 to the
right direction. At this time, when switch portion 39A of rotary
shaft body 2A and switch portion 39B of rotary shaft body 2B are
interlocked with each other so that right driving motor 38A on the
user side rotates in a direction opposite to the rotation direction
of driving motor 38B, it is possible to more easily change the
direction of suction port portion 1 to the right direction. In the
same manner, when switch portion 39A of rotary shaft body 2A and
switch portion 39B of rotary shaft body 2B are interlocked with
each other so that right driving motor 38A on the user side rotates
slower than driving motor 38B, it is possible to more easily change
the direction of suction port portion to the right direction. In
any case, there is a difference in the rotation speed between
rotary shaft bodies 2A and 2B.
[0030] On the contrary, in order to further change the direction of
suction port portion 1 to the left direction, switch portion 39A of
rotary shaft body 2A and switch portion 39B of rotary shaft body 2B
are interlocked with each other as below. Switch portion 39A of
rotary shaft body 2A and switch portion 39B of rotary shaft body 2B
are interlocked with each other so that only right driving motor
38A on the user side rotates in the positive direction, left
driving motor 38B on the user side rotates in a direction opposite
to the rotation direction of driving motor 38A, or left driving
motor 38B on the user side rotates more slowly than driving motor
38A when switch lever portion 10 is pushed down in the left
direction.
[0031] That is, in this embodiment, rotation speed difference
generating mechanisms are separately disposed in each of rotary
shaft bodies 2A and 2B, and include separately rotating driving
motors 38A and 38B, rotary shaft body switch portions 39A and 39B,
and switch lever portion 10.
[0032] As described above, in this embodiment, the direction of
suction port portion 1 can be changed by generating a difference in
the rotation speed between two rotary shaft bodies 2A and 2B. For
this reason, it is possible to reduce a burden applied to an arm or
wrist upon changing the direction of suction port portion 1 in the
left and right direction.
[0033] In this embodiment, suction port portion 1 propels itself in
accordance with the rotation of rotary shaft bodies 2A and 2B. For
this reason, since suction port portion 1 propels itself forward or
backward during a cleaning operation, it is possible to reduce the
burden during the cleaning operation.
[0034] In this embodiment, suction port portion 1 propels itself in
accordance with the rotation of rotary shaft bodies 2A and 2B. For
this reason, since there is a difference in the rotation speed
between two rotary shaft bodies 2A and 2B, it is possible to reduce
the burden applied to the arm or wrist upon changing the direction
of suction port portion 1.
[0035] In this embodiment, driving motor 4 is disposed inside each
of rotary shaft bodies 2A and 2B. For this reason, it is possible
to decrease the size of suction port portion 1 and to easily handle
suction port portion 1 in a narrow space. In addition, it is
possible to dispose rotary brush unit 2 in substantially the entire
width of suction port portion 1, and to improve a cleaning
performance for cleaning a side wall.
[0036] In this embodiment, handle portion 11 includes switch lever
portion 10 which is operable in the left and right direction, and
the rotation of two rotary shaft bodies 2A and 2B of rotary brush
unit 2 is controlled so that the direction of suction port portion
1 is changed to the direction in which switch lever portion 10 is
operated. For this reason, it is possible to change the direction
of suction port portion 1 just by using a finger tip without
performing a large action in which handle portion 11 is twisted or
pushed down.
Second Embodiment
[0037] FIG. 4 is an entire perspective view showing the electric
vacuum cleaner according to a second embodiment of the invention.
This embodiment is different from the first embodiment in that
switch lever portion 10 is not provided. Instead of switch lever
portion 10, handle portion 11 which is twistable in the left and
right direction is provided. The rotation speed of two rotary shaft
bodies 2A and 2B disposed in rotary brush unit 2 inside suction
port portion 1 is controlled through the electric controller (not
shown) so that the direction of suction port portion 1 is changed
to the twisting direction of handle portion 11. When the twisting
amount becomes large, the difference in the rotation speed between
rotary shaft bodies 2A and 2B becomes large, and the turning amount
becomes large. In the case where handle portion 11 is not twisted,
suction port portion rotates forward. Since the other
configurations are same as those of the first embodiment, detailed
description thereof will be omitted.
[0038] As described above, in this embodiment, handle portion 11 is
twistable in the left and right direction. When handle portion 11
is twisted in the left and right direction, the rotation of two
rotary shaft bodies 2A and 2B of rotary brush unit 2 is controlled
so that the direction of suction port portion 1 is changed to the
twisting direction of handle portion 11. Accordingly, it is
possible to change the self-propelling direction of the suction
port portion while having the same feeling of operation as with a
general cleaner having an oscillation mechanism.
Third Embodiment
[0039] FIG. 5 is a plan view showing rotary brush unit 2 inside
suction port portion 1 of the electric vacuum cleaner according to
a third embodiment of the invention. Rotary shaft bodies 2A and 2B
constituting rotary brush unit 2 are rotatably connected to each
other through connection portion 30. Connection portion 30 is
formed as a simple bearing, and a difference in the rotation speed
between rotary shaft bodies 2A and 2B is absorbed by connection
portion 30. Brush 3 is attached to surfaces of rotary shaft bodies
2A and 2B.
[0040] Stiff brushes 3A depicted by the solid line are attached to
predetermined ranges 101 of rotary brush unit 2. Soft brush 3B
depicted by the dotted line is attached to predetermined ranges 102
at the center of rotary brush unit 2. Since the other
configurations are the same as those of the first embodiment,
detailed description thereof will be omitted.
[0041] With such a configuration, since a large self-propelling
force is generated at a position far from the turning center, it is
possible to more efficiently turn suction port portion 1.
[0042] In this embodiment, the direction of the suction port
portion is changed by generating a difference in the rotation speed
between the driving motors using switch lever portion 10 of the
first embodiment or handle portion 11B, which is twistable, of the
second embodiment. At this time, in this embodiment, since the
brush 3 includes stiff brushes 3A in the vicinity of both ends of
rotary brush unit 2 and soft brushes 3B in the vicinity of the
center thereof, it is possible to more efficiently turn suction
port portion 1.
[0043] As described above, in this embodiment, the stiffness of
each of the brushes 3 in the vicinity of both ends of rotary brush
unit 2 is set to be larger than that in the vicinity of the center
thereof. Accordingly, since it is possible to improve the direction
changing force of suction port portion 1, it is possible to change
the self-propelling direction even on a floor surface having a high
resistance such as a deep carpet.
Fourth Embodiment
[0044] FIG. 6 is a plan view showing rotary brush unit 2 inside
suction port portion 1 of the electric vacuum cleaner according to
a fourth embodiment of the invention. In rotary shaft bodies 2A and
2B constituting rotary brush unit 2, the outer diameter of range
110 in the vicinity of the center of rotary brush unit 2 is small,
and the outer diameter becomes large toward both ends. The length
of brush 3 attached to rotary shaft bodies 2A and 2B becomes
shorter as the outer diameters of rotary shaft bodies 2A and 2B
become larger. That is, in each of rotary shaft bodies 2A and 2B,
brush 3 includes brushes 3C and 3D of which the lengths becomes
short in a direction from the center to both ends. Accordingly, as
depicted by one-dot dashed line P1, the outer diameter of brush 3
up to the end of the bristle is substantially uniform throughout
the entire width of the rotary brush unit 2. Since the other
configurations are same as those of the first embodiment, detailed
description thereof will be omitted.
[0045] With such a configuration, since the brush is hardly pushed
down due to the short length of the brush, it is possible to
improve the self-propelling force at both ends of rotary brush unit
2 even in the case of using a brush formed of the same material.
That is, it is possible to more efficiently turn suction port
portion 1.
[0046] In this embodiment, the direction of the suction port
portion is changed by generating a difference in the rotation speed
between the driving motors using switch lever portion 10 of the
first embodiment or handle portion 11B, which is twistable, of the
second embodiment. At this time, in this embodiment, since brush 3
includes brushes 3C and 3D of which the lengths become short in a
direction from the center of rotary brush unit 2 to both ends
thereof, it is possible to more efficiently turn suction port
portion 1.
[0047] As described above, in this embodiment, the outer diameter
of each of rotary shaft bodies 2A and 2B in the vicinity of both
ends of rotary brush unit 2 is set to be larger than that in the
vicinity of the center thereof. In addition, the length of each of
brushes 3 in the vicinity of both ends of rotary brush unit 2 is
set to be shorter than that in the vicinity of the center thereof,
and the outer diameter of each of brushes 3 up to the end of the
bristle in the vicinity of both ends of rotary brush unit 2 is set
to be same as that in the vicinity of the center thereof.
Accordingly, it is possible to improve the direction changing force
of suction port portion 1, and to change the self-propelling
direction even on a floor surface having a large sliding resistance
such as a deep carpet. Further, since the outer diameter of each of
brushes 3 up to the end of the bristle is set to be uniform, it is
possible to have uniform contact with a floor surface. Accordingly,
it is possible to obtain a uniform suction function and a uniform
self-propelling function throughout the entire width of rotary
brush unit 2.
Fifth Embodiment
[0048] FIG. 7 is a plan view showing rotary brush unit 2 inside
suction port portion 1 of the electric vacuum cleaner according to
a fifth embodiment of the invention. In brush 3 attached to the
surfaces of rotary shaft bodies 2A and 2B constituting rotary brush
unit 2, the length of brush 3 is short in range 110 in the vicinity
of the center of rotary brush unit 2, and becomes longer toward
both ends. The outer diameter of brush 3 up to the end of the
bristle is depicted by one-dot chain line P2. That is, brush 3
includes brushes 3E and 3F which are respectively disposed in
rotary shaft bodies 2A and 2B so that the lengths thereof become
longer in a direction from the center of rotary brush unit 2 to
both ends thereof. Since the other configurations are same as those
of the first embodiment, detailed description thereof will be
omitted.
[0049] With such a configuration, brush 3 at both ends of rotary
brush unit 2 strongly comes into contact with the floor surface to
thereby generate a large self-propelling force. As a result, it is
possible to more efficiently turn suction port portion 1.
[0050] In this embodiment, the direction of the suction port
portion can be changed by generating a difference in the rotation
speed between the driving motors using switch lever portion 10 of
the first embodiment or handle portion 11B, which is twistable, of
the second embodiment. At this time, in this embodiment, since
brush 3 includes brushes 3E and 3F of which the lengths become
longer in a direction from the center of rotary brush unit 2 to
both ends thereof, it is possible to more efficiently turn suction
port portion 1.
[0051] As described above, in this embodiment, the length of each
of brushes 3 in the vicinity of both ends of rotary brush unit 2 is
set to be longer than that in the vicinity of the center thereof.
Accordingly, since it is possible to improve the direction changing
force of suction port portion 1, it is possible to change the
self-propelling direction even on a floor surface having a large
resistance such as a deep carpet. Further, since the distance from
the center of the attachment portion of brush 3 is uniform, it is
possible to easily perform a transplanting operation using an
automatic machine.
Sixth Embodiment
[0052] FIG. 8 is a plan view showing rotary brush unit 2 inside
suction port portion 1 of the electric vacuum cleaner according to
a sixth embodiment of the invention. In the same manner as the
above-described embodiments, brush 3 is attached to the surfaces of
rotary shaft bodies 2A and 2B constituting rotary brush unit 2. The
pitch between brushes 3 attached to predetermined ranges 120 of
both ends of rotary brush unit 2 is narrow. The pitch at
predetermined range 121 in the vicinity of the center of rotary
brush unit 2 is wide. That is, brush 3 includes high-density brush
3G attached to both ends of rotary brush unit 2 and low-density
brush 3H attached to the vicinity of the center thereof. Since the
other configurations are same as those of the first embodiment,
detailed description thereof will be omitted.
[0053] Accordingly, it is possible to generate a large
self-propelling force at both ends of rotary brush unit 2. For this
reason, it is possible to more efficiently turn suction port
portion 1.
[0054] In this embodiment, the direction of the suction port
portion is changed by generating a difference in the rotation speed
between the driving motors using switch lever portion 10 of the
first embodiment or handle portion 11B, which is twistable, of the
second embodiment. At this time, in this embodiment, since brush 3
includes high-density brush 3G attached to both ends of rotary
brush unit 2 and low-density brush 3H attached to the vicinity of
the center thereof, it is possible to more efficiently turn suction
port portion 1.
[0055] As described above, in this embodiment, the density of each
of brushes 3 in the vicinity of both ends of rotary brush unit 2 is
set to be higher than that in the vicinity of the center thereof.
Particularly, brush 3 of each of rotary shaft bodies 2A and 2B is
formed with a comb tooth shape, and the pitch of the comb tooth
shape of each of brushes 3 in the vicinity of both ends of rotary
brush unit 2 is set to be denser than that of each of brushes 3 in
the vicinity of the center thereof. Accordingly, since it is
possible to improve the direction changing force of suction port
portion 1, it is possible to change the self-propelling direction
even on a floor surface having a high resistance such as a deep
carpet. In addition, since it is possible to make the type,
stiffness, and length of the bristles of brush 3 uniform throughout
the entire width of brush unit 2, it is possible to improve the
productivity.
Seventh Embodiment
[0056] FIG. 9 is a plan view showing rotary brush unit 2 inside
suction port portion 1 of the electric vacuum cleaner according to
a seventh embodiment of the invention. In the same manner as the
above-described embodiments, brush 3 is attached to the surfaces of
rotary shaft bodies 2A and 2B constituting rotary brush unit 2. In
brushes 3, four lines of brushes 3I are respectively attached to
predetermined ranges 130 of both ends of rotary brush unit 2. Two
lines of brushes 3J are attached to range 131 in the vicinity of
the center of rotary brush unit 2. Since the other configurations
are same as those of the first embodiment, detailed description
thereof will be omitted.
[0057] Accordingly, it is possible to generate a large
self-propelling force at both ends of rotary brush unit 2. For this
reason, it is possible to more efficiently turn suction port
portion 1.
[0058] In this embodiment, the direction of the suction port
portion is changed by generating a difference in the rotation speed
between the driving motors using switch lever portion 10 of the
first embodiment or handle portion 11B, which is twistable, of the
second embodiment. At this time, in this embodiment, since brush 3
includes four lines of brushes 3I in both ends of rotary brush unit
2 and two lines of brushes 3J in the vicinity of the center
thereof, it is possible to more efficiently turn suction port
portion 1.
[0059] As described above, brushes 3 of rotary shaft bodies 2A and
2B are formed in a stripe shape, and the number of lines of brushes
3 in the vicinity of both ends of rotary brush unit 2 is larger
than that of brushes 3 in the vicinity of the center thereof.
Accordingly, since it is possible to improve the direction changing
force of suction port portion 1, it is possible to change the
self-propelling direction even on a floor surface having a high
resistance such as a deep carpet. In addition, since it is possible
to make the type, stiffness, length, and transplanting pitch of the
bristles of brush 3 uniform throughout the entire width of brush
unit 2, it is possible to improve the productivity.
[0060] As described above, the electric vacuum cleaner according to
the invention includes the cleaner body portion which has the
electric blower for generating a suction wind; the suction port
portion which sucks dust together with the suction wind; the handle
portion which moves the suction port portion; the rotary brush unit
which is disposed inside the suction port portion and in which two
rotary shaft bodies each having a brush are disposed in series; the
rotary brush unit driving portion which separately rotates each of
the rotary shaft bodies; and the rotation speed difference
generating mechanism which generates a difference in the rotation
speed between two rotary shaft bodies.
[0061] With such a configuration, it is possible to reduce the
burden applied to the arm or wrist upon changing the direction of
suction port portion in the left and right direction.
[0062] In the invention, the suction port portion propels itself in
accordance with the rotation of the rotary shaft bodies. With such
a configuration, since the suction port portion propels itself
forward or backward during the cleaning operation, it is possible
to reduce the burden applied to the arm or wrist.
[0063] In the invention, the rotary brush unit driving portion is
configured as the driving motor disposed inside each of the rotary
shaft bodies. With such a configuration, it is possible to decrease
the size of the suction port portion and to easily handle the
suction port portion in a narrow space. In addition, it is possible
to dispose the rotary brush unit in substantially the entire width
of the suction port portion, and to improve the cleaning
performance for cleaning a side wall.
[0064] In the invention, the handle portion includes the switch
lever portion which is operable in the left and right direction,
and controls the rotation of two rotary shaft bodies of the rotary
brush unit so that the direction of the suction port portion is
changed to the operation direction of the switch lever portion.
With such a configuration, it is possible to change the direction
of the suction port portion just by using a finger tip without
performing a large action in which the handle portion is twisted or
pushed down.
[0065] In the invention, the handle portion is twistable in the
left and right direction. When the handle portion is twisted in the
left and right direction, the rotation of two rotary shaft bodies
of the rotary brush unit is controlled so that the direction of the
suction port portion is changed to the twisting direction of the
handle portion. With such a configuration, it is possible to change
the self-propelling direction of the suction port portion while
having the same feeling of operation as with a general cleaner
having an oscillation mechanism.
[0066] In the invention, the stiffness of each of the brushes in
the vicinity of both ends of the rotary brush unit is set to be
larger than that in the vicinity of the center thereof. With such a
configuration, since it is possible to improve the direction
changing force of the suction port portion, it is possible to
change the self-propelling direction even on a floor surface having
a high resistance such as a deep carpet.
[0067] In the invention, the outer diameter of each of the rotary
shaft bodies in the vicinity of both ends of the rotary brush unit
is set to be larger than that in the vicinity of the center
thereof. In addition, the length of each of the brushes in the
vicinity of both ends of the rotary brush unit is set to be shorter
than that in the vicinity of the center thereof, and the outer
diameter of each of the brushes up to the end of the bristle in the
vicinity of both ends of the rotary brush unit is set to be same as
that in the vicinity of the center thereof
[0068] With such a configuration, it is possible to improve the
direction changing force of the suction port portion, and to change
the self-propelling direction even on a floor surface having a
large sliding resistance such as a deep carpet. Further, since the
outer diameter of the brush up to the end of the bristle is set to
be uniform, it is possible to have uniform contact with a floor
surface. Accordingly, it is possible to obtain a uniform suction
function and a uniform self-propelling function throughout the
entire width of the rotary brush unit.
[0069] In the invention, the length of each of the brushes in the
vicinity of both ends of the rotary brush unit is set to be longer
than that in the vicinity of the center thereof With such a
configuration, since it is possible to improve the direction
changing force of the suction port portion, it is possible to
change the self-propelling direction even on a floor surface having
a large resistance such as a deep carpet. Further, since the
distance from the center of the attachment portion of the brush is
uniform, it is possible to easily perform a transplanting operation
using an automatic machine.
[0070] In the invention, the density of each of the brushes in the
vicinity of both ends of the rotary brush unit is set to be higher
than that in the vicinity of the center thereof With such a
configuration, since it is possible to improve the direction
changing force of the suction port portion, it is possible to
change the self-propelling direction even on a floor surface having
a high resistance such as a deep carpet. In addition, since it is
possible to make the type, stiffness, and length of the bristles of
the brush uniform throughout the entire width of the brush unit, it
is possible to improve the productivity.
[0071] In the invention, the brushes of each of the rotary shaft
bodies are formed with a comb tooth shape, and the pitch of the
comb tooth shape of each of the brushes in the vicinity of both
ends of the rotary brush unit is set to be denser than that in the
vicinity of the center thereof.
[0072] With such a configuration, since it is possible to improve
the direction changing force of the suction port portion, it is
possible to change the self-propelling direction even on a floor
surface having a high resistance such as a deep carpet. In
addition, since it is possible to make the type, stiffness, and
length of the bristles of the brush uniform throughout the entire
width of the brush unit, it is possible to improve the
productivity.
[0073] In the invention, the brush of the rotary shaft body is
formed in a stripe shape, and the number of lines of the brushes in
the vicinity of both ends of the rotary brush unit is set to be
larger than that in the vicinity of the center thereof.
[0074] With such a configuration, since it is possible to improve
the direction changing force of the suction port portion, it is
possible to change the self-propelling direction even on a floor
surface having a high resistance such as a deep carpet. In
addition, since it is possible to make the type, stiffness, and
length of the bristles of the brush uniform throughout the entire
width of the brush unit, it is possible to improve the
productivity.
[0075] As described above, the advantage of the invention is
particularly apparent in a heavy electric vacuum cleaner such as an
upright cleaner. For this reason, it is possible for even an old
person, a woman, or a child to perform a cleaning operation using
the electric vacuum cleaner, and to suppress fatigue even during a
lengthy cleaning operation. In addition, regardless of age, sex or
whether used at home or the office, it is possible to reduce the
effort involved during a cleaning operation.
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