U.S. patent number 3,591,888 [Application Number 04/887,055] was granted by the patent office on 1971-07-13 for electrically operated vacuum cleaner equipped with automatic filter-cleaning means.
This patent grant is currently assigned to Matsushita Electric Industrial Co., Ltd.. Invention is credited to Shigeyuki Asanari, Tetsuya Nakamura, Katsuo Sawada, Chuji Takeda.
United States Patent |
3,591,888 |
Takeda , et al. |
July 13, 1971 |
**Please see images for:
( Certificate of Correction ) ** |
ELECTRICALLY OPERATED VACUUM CLEANER EQUIPPED WITH AUTOMATIC
FILTER-CLEANING MEANS
Abstract
An electrically operated vacuum cleaner having automatic
filter-cleaning means, said means comprising a filter-cleaning
member adapted to be driven by the rotation of cord takeup means
transmitted through power-transmitting means, the movement of the
filter-cleaning member being utilized to apply deflection and
impact to the filter for removing dusts therefrom.
Inventors: |
Takeda; Chuji (Toyonaka-shi,
JA), Sawada; Katsuo (Suita-shi, JA),
Asanari; Shigeyuki (Suita-shi, JA), Nakamura;
Tetsuya (Osaka, JA) |
Assignee: |
Matsushita Electric Industrial Co.,
Ltd. (Osaka, JA)
|
Family
ID: |
27424952 |
Appl.
No.: |
04/887,055 |
Filed: |
December 22, 1969 |
Foreign Application Priority Data
|
|
|
|
|
Dec 27, 1968 [JA] |
|
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43/785/69 |
|
Current U.S.
Class: |
15/323; 55/300;
15/352 |
Current CPC
Class: |
A47L
9/20 (20130101); A47L 9/26 (20130101) |
Current International
Class: |
A47L
9/20 (20060101); A47L 9/26 (20060101); A47l
009/20 () |
Field of
Search: |
;15/323,339,352
;55/300 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Scheel; Walter A.
Assistant Examiner: Moore; C. K.
Claims
What we claim is:
1. An electrically operated vacuum cleaner equipped with automatic
filter-cleaning means, said cleaner comprising a filter housed
within a cleaner body having an intake and an exhaust port, an
electrically operated blower, and automatic filter-cleaning means,
said means comprising a filter-cleaning member adapted to beat the
crests of pleats formed on said filter to cause deflection and
vibration thereof so that dusts are removed therefrom, cord takeup
means for taking up a power supply cord of the cleaner, and power
transmission means for transmitting the rotation of the cord takeup
means to said filter-cleaning member.
2. An electrically operated vacuum cleaner equipped with automatic
filter-cleaning means, said cleaner comprising a filter housed
within a cleaner body having an intake and an exhaust port, an
electrically operated blower, and automatic filter-cleaning means,
said means comprising a filter-cleaning member adapted to beat the
crests of pleats formed on said filter to cause deflection and
vibration thereof so that dusts are removed therefrom, cord takeup
means for taking up a power supply cord of the cleaner, and power
transmission means for transmitting the rotation of the cord takeup
means to said filter-cleaning member, said power transmission means
including a gear formed on the outer periphery of a reel frame of
said cord takeup means and another gear of smaller diameter meshing
with said first mentioned gear for transmitting the rotation of the
cord takeup means with a multiplied speed.
3. An electrically operated vacuum cleaner equipped with automatic
filter-cleaning means, said cleaner comprising a filter housed
within a cleaner body having an intake and an exhaust port, an
electrically operated blower, and automatic filter-cleaning means,
said means comprising a filter-cleaning member adapted to beat the
crests of pleats formed on said filter to cause deflection and
vibration thereof so that dusts are removed therefrom, cord takeup
means for taking up a power supply cord of the cleaner, and power
transmission means for transmitting the rotation of the cord takeup
means to said filter-cleaning member, said filter-cleaning member
being disposed between said filter and said blower at the side
opposite to the filter surface on which dusts are accumulated.
4. An electrically operated vacuum cleaner equipped with automatic
filter-cleaning means, said cleaner comprising a filter housed
within a cleaner body having an intake and an exhaust port, an
electrically operated blower, and automatic filter-cleaning means,
said means comprising a filter-cleaning member adapted to beat the
crests of pleats formed on said filter to cause deflection and
vibration thereof so that dusts are removed therefrom, cord takeup
means for taking up a power supply cord of the cleaner, and power
transmission means for transmitting the rotation of the cord takeup
means to said filter-cleaning member, a chamber being provided
below said filter for receiving dusts removed from said filter,
said chamber having a partition wall for preventing intake air from
flowing into said chamber.
5. An electrically operated vacuum cleaner equipped with automatic
filter-cleaning means, said cleaner comprising a filter housed
within a cleaner body having an intake and an exhaust port, an
electrically operated blower, and automatic filter-cleaning means,
said means comprising a filter-cleaning member adapted to beat the
crests of pleats formed on said filter to cause deflection and
vibration thereof so that dusts are removed therefrom, cord takeup
means for taking up a power supply cord of the cleaner, and power
transmission means for transmitting the rotation of the cord takeup
means to said filter-cleaning member, said power transmission means
including a large gear formed on the real frame of the cord takeup
means, a small gear meshing with said large gear and a rotatable
shaft having one end connected to said small gear and extending
within said cleaner body along the side of said blower.
6. An electrically operated vacuum cleaner in accordance with claim
2, in which said filter-cleaning member has at least one projection
for thrusting into the pleats on the filter and is so arranged that
it moves substantially perpendicularly to said pleats, said power
transmission means serves, in response to either one of cord takeup
or cord drawout movements of said cord takeup means, to transmit
the rotation with a multiplied speed to said filter cleaning member
so as to reciprocate it.
7. An electrically operated vacuum cleaner in accordance with claim
1 in which said power transmission means transmits the rotation of
the cord takeup means only when the power supply cord is being
drawn out.
8. An electrically operated vacuum cleaner equipped with automatic
filter-cleaning means said cleaner comprising a filter housed
within a cleaner body having an intake and an exhaust port, an
electrically operated blower, and automatic filter-cleaning means,
said means comprising a filter-cleaning member adapted to beat the
crests of pleats formed on said filter to cause deflection and
vibration thereof so that dusts are removed therefrom cord takeup
means for taking up a power supply cord of the cleaner, and power
transmission means for transmitting the rotation of the cord takeup
means to said filter-cleaning member, said blower, said cord takeup
means and said power transmission means being mounted within a rear
casing of the cleaner body having said exhaust port, said
filter-cleaning member being movably mounted at the front face of
said rear casing provided with air passage means, the projection of
said member being so arranged that it thrusts into the pleats of
the filter formed on the face opposite to the one on which dusts
are accumulated, said filter being removably mounted within a front
casing of the cleaner body which is removably connected with the
rear casing, said power transmission means comprising a large gear
formed on the outer periphery of the reel frame of the cord takeup
means, a small gear meshing with said large gear, a rotatable shaft
having one end connected to the small gear and disposed along the
side of said blower, and means for converting the rotation of said
shaft into a reciprocating movement and transmitting to said
filter-cleaning member.
9. An electrically operated vacuum cleaner equipped with automatic
filter-cleaning means, said cleaner comprising a filter housed
within a cleaner body having an intake and an exhaust port, an
electrically operated blower, and automatic filter-cleaning means,
said means comprising a filter-cleaning member adapted to beat the
crests of pleats formed on said filter to cause deflection and
vibration thereof so that dusts are removed therefrom, cord takeup
means for taking up a power supply cord of the cleaner, and power
transmission means for transmitting the rotation of the cord takeup
means to said filter-cleaning member, said power transmission means
including a large gear formed on the reel frame of the cord takeup
means, a small gear meshing with said large gear and a rotatable
shaft having one end connected to said small gear and extending
along the side of said blower, said filter-cleaning member being so
arranged with respect to its support member that a gap is formed
therebetween and provided with a resilient member which can yield
when the projection of said filter cleaning member passes over the
crests of the filter pleats.
10. An electrically operated vacuum cleaner equipped with automatic
filter-cleaning means, said cleaner comprising a filter housed
within a cleaner body having an intake and an exhaust port, an
electrically operated blower, and automatic filter-cleaning means,
said means comprising a filter-cleaning member adapted to beat the
crests of pleats formed on said filter to cause deflection and
vibration thereof so that dusts are removed therefrom, cord takeup
means for taking up a power supply cord of the cleaner, and power
transmission means for transmitting the rotation of the cord takeup
means to said filter-cleaning member, said power transmission means
including a gear formed on the outer periphery of the reel frame of
said cord takeup means and another gear of a smaller diameter
whereby the rotation of the cord takeup means is transmitted with a
multiplied speed to the filter-cleaning member to rotate it.
Description
The present invention relates to an electrically operated vacuum
cleaner equipped with automatic filter-cleaning means.
According to the present invention, there is provided an
electrically operated vacuum cleaner equipped with automatic
filter-cleaning means, said cleaner comprising, within a cleaner
body having an intake and an outlet port, a filter having a
plurality of pleats, a filter-cleaning member, an electrically
operated blower, and cord takeup means, which are arranged in this
order from the intake end of the cleaner body, the arrangement
being such that the rotation of the cord takeup means is
transmitted through power-transmitting means provided in the
cleaner body to the filter-cleaning member, and the filter-cleaning
member is adapted, upon movement, to beat the crests of the pleats
to apply deflection and vibration to the filter so as to remove
dusts therefrom.
In a conventional electrically operated vacuum cleaner, a rotatable
brush is provided for brushing a dusted surface of a filter member
to take the dust off the filter surface, the brush being rotatably
connected with the rotatable shaft of cord takeup means. In this
known arrangement, since the rotation of the cord takeup means is
transmitted to the rotatable brush without being increased in
speed, a highly efficient filter-cleaning operation cannot be
expected. Further, since the rotatable brush is always maintained
in forced contact with the filter surface, the frictional force
between the filter and the rotatable brush is increased resulting
in an increase in the force required for taking up or drawing out
the power supply cord. This is disadvantageous in that the normal
function of the cord takeup means is impeded and thus the
rotational speed of the brush itself is correspondingly decreased,
with the result that the filter-cleaning function is adversely
affected.
An object of the present invention is to make it possible to obtain
a highly efficient operation of an electrically operated vacuum
cleaner by preventing clogging of filter and to perform a
filter-cleaning operation with ease and with a hygienically
recommendable manner.
Another object of the present invention is to obtain a highly
efficient filter-cleaning operation by transmitting, with a
multiplied speed, the rotation of the cord takeup means to a
filter-cleaning member through power transmission means which is
conveniently provided by a large gear formed on the outer periphery
of the reel frame of the cord takeup means, said gear being in
meshing engagement with a small gear.
A further object of the present invention is to provide a
filter-cleaning member adapted to beat the crests of pleats on the
filter at the side opposite to the surface of the filter on which
dusts are normally accumulated, so as to apply deflection and
vibration to the filter to prevent the dust from accumulating
thereon and to make it possible to fully utilize the filtering
area.
Still further object of the present invention is to provide a
chamber below the filter for temporarily receiving the dust shaken
off the filter, said chamber having a partition wall provided
therein for preventing the cleaning air from flowing into the
chamber, whereby the dust collected in the chamber is prevented
from being recirculated toward the filter even when the cleaner is
used without disposing the dust in the chamber, and thus the
necessity for disposing the dust prior to using the cleaner can be
minimized so that the advantageous feature of the automatic
filter-cleaning means can be fully utilized.
Another object of the present invention is to transmit the rotation
of cord takeup means in one direction of either the cord takeup
movement or cord drawout movement to a filter-cleaning member by
increasing in speed and converting into a reciprocating movement
through power transmission means, so as to increase filter-cleaning
efficiency without giving any adverse effects on the cord
drawing-out or taking-up operation of the cord takeup means.
Still further object of the present invention is to transmit the
rotation of the cord takeup means to a filter-cleaning member
through power transmission means only when the power supply cord is
being drawn out, so that the filter-cleaning operation can be
positively performed without affecting the cord takeup operation of
the electric cord takeup means.
According to the present invention, an electrically operated vacuum
cleaner having automatic filter-cleaning means comprises a filter
having a plurality of pleats each of substantially triangular shape
in cross section, a filter cleaning member having at least one
projection for thrusting into the pleats of the filter and adapted
to move substantially perpendicularly to the pleats, and power
transmission means for transmitting the rotation of cord takeup
means during either the cord drawout movement or cord takeup
movement to the filter-cleaning member by increasing in speed and
converting into a reciprocating movement.
Thus, the filter-cleaning member is reciprocatingly moved with an
increased speed through the transmission means to apply violent
vibrations to the filter, whereby a highly efficient
filter-cleaning operation can be performed.
Further, according to the present invention, the filter-cleaning
member is caused to move along the filter surface by the rotation
of the cord takeup means in only one direction of either the cord
takeup or cord drawout movement, and by designing the device so
that the filter-cleaning member is actuated when the power supply
cord is being drawn out, the frictional force between the filter
and the filter-cleaning member will not have any adverse effects on
the cord takeup operation. Thus, the present invention is effective
to facilitate the filter-cleaning function. Particularly, it should
be noted that, since the rotation of the cord takeup means is
transmitted to the filter-cleaning member with a multiplied speed,
a sufficient filter-cleaning operation can be obtained even if the
rotational speed of the cord takeup reel is low.
Further, if the arrangement is such that the filter-cleaning member
is operated when the power supply cord is being taken up, the
member will be reciprocated with much faster speed than the
arrangement in which the member is moved when the power supply cord
is being drawn out, whereby the filter will be subjected to a very
intense vibration so that a highly efficient filter-cleaning
operation can be expected.
According to the inventor's experiment, an excellent result could
be obtained with 1.5 to 3.0 mm. of the depth of engagement between
the pleats of the main filter and the projections of the
filter-cleaning member and with the gear ratio of 5:1.
Further, according to the present invention, since the rotation of
the cord takeup means is transmitted to the filter-cleaning member
with a multiplied speed through the power transmission mechanism,
the filter-cleaning member can be operated with an increased speed
to obtain an effective result.
In a preferred mode of the present invention in which the power
transmission means for multiplying the speed of the cord takeup
means comprises a large gear formed on the outer periphery of the
reel frame and an small gear which meshes with the large gear, the
structure can be made simple with reduced number of parts. Further,
in such a type of vacuum cleaner which comprises an electrically
operated blower and a cord takeup means disposed behind the blower,
the arrangement utilizing a large gear formed on the outer
periphery of the cord takeup reel is advantageous in that the power
transmission having a small gear for meshing engagement with the
large gear can be disposed in the dead space formed around the
blower, and that the rotation of the cord takeup means can be
transmitted to the filter-cleaning member disposed in front of the
blower without being interrupted by the existence of the blower.
Thus, the automatic filter-cleaning means can be provided with a
preferable manner without giving any adverse effects on the
location of the blower itself.
According to one aspect of the present invention, the vacuum
cleaner comprises a filter, a filter-cleaning member for removing
the dust adhered on the filter, and power transmission means for
transmitting the rotation of cord takeup means to said
filter-cleaning member, the arrangement being such that the
rotation of the cord takeup means is not transmitted to the
filter-cleaning member when the power supply cord is being taken
up, but is transmitted by the power transmission means only when
the power supply cord is being drawn out. This arrangement provides
the following advantages.
a. Since the vacuum cleaner cannot be put into operation unless the
power supply cord is drawn out, the filter can be positively and
readily cleaned every time when the cleaner is used irrespective of
whether the operator intends to do so or not, whereby the vacuum
cleaner can always be operated with the highest suction force.
b. The speed of movement of the filter-cleaning member can be
controlled by controlling the speed in which the power supply cord
is drawn out, so that the rate of the filter cleaning can be
adjusted in accordance with the amount of filter clogging.
c. Since the power supply cord can be taken up without any
frictional force between the filter and the filter-cleaning member,
the cord takeup operation can smoothly and positively be performed
while, on the other hand, the cleaning of the filter is also
sufficiently performed.
According to another aspect of the present invention, the
electrically operated vacuum cleaner comprises a filter having a
plurality of pleats of substantially triangular cross section, a
filter-cleaning member having at least one projection for thrusting
into the pleats of the filter and adapted to move substantially
perpendicularly to the pleats, and power transmission means for
converting the rotation of the cord takeup means to a reciprocating
movement and transmitting to the filter-cleaning member, said
filter-cleaning member, said power transmission means and said cord
takeup means being housed, together with an electrically operated
blower, within a casing having an exhaust port, said filter being
removably housed in a second casing which has an intake port and is
removably connected to the first casing.
In this arrangement, when it is desired to dispose the dust shaken
off the filter by the filter-cleaning member, the first casing can
be disconnected from the second casing leaving only the filter
within the second casing. Thus, the second casing can conveniently
be carried and the dust collected therein can readily be disposed
only by removing the filter.
Further, in contrast to a conventional structure in which a
filter-cleaning member is actuated to shake the dust off the filter
after the second casing is disconnected from the first casing, the
aforementioned arrangement is convenient in cleaning the filter
since the work is performed utilizing the rotation of the cord
takeup means.
In such an arrangement in which the filter-cleaning member is
connected with the filter and the member is actuated by utilizing
the rotation of the cord takeup means, it is very difficult to
removably connect the filter cleaning member and the power
transmission means for transmitting the rotation of the cord takeup
means in order to allow the removal of one casing from the other.
However, according to the present invention, the filter-cleaning
member, the power transmission means and the cord takeup means are
mounted in a single casing, so that it is not necessary to
disconnect them once they are assembled and that they can be
mounted with a simple and conventional manner.
Further, in the present invention, the filter can be washed in a
more simple manner than in a conventional arrangement.
The other objects and the advantages of the present invention will
become apparent from the following descriptions relating to
electrically operated vacuum cleaners having automatic
filter-cleaning means made in accordance with the present invention
and shown in the accompanying drawings, in which;
FIG. 1 is a side elevational view showing one embodiment of the
electrically operated vacuum cleaner in accordance with the present
invention;
FIG. 2 is a longitudinal section of the cleaner shown in FIG.
1;
FIG. 3 is a plan view of the electrically operated vacuum cleaner
shown in FIG. 1 with parts broken away to show the interior of the
cleaner;
FIG. 4 is an enlarged cross-sectional view showing the relationship
between the filter-cleaning member and the filter in the vacuum
cleaner shown in FIG. 1;
FIG. 5 is a perspective view showing the relationship between the
cord takeup means, the power transmission means and the
filter-cleaning member provided in the vacuum cleaner shown in FIG.
1;
FIG. 6 is an exploded view of the power transmission means;
FIG. 7 is a longitudinal section of an electrically operated vacuum
cleaner showing the second embodiment of the present invention;
FIG. 8 is a plan view of the cleaner shown in FIG. 7; and,
FIG. 9a and 9b are, respectively, a fragmentary sectional view of
the filter-cleaning means, and a perspective view of the
filter-cleaning member.
Referring to FIGS. 1 to 6 which show the first embodiment of the
present invention, the reference numeral 1 shows a rear casing of
cleaner body having an electrically operated blower 2 and cord
takeup means 3 housed therein. The rear casing 1 is provided with a
handle 4 on the upper surface, and exhaust port 5 on the rear
surface, air passage hole 6 on the front surface, and wheels 7 on
the lower surface. The numeral 8 shows a front casing of the
cleaner body having a removable dust collector means 9 mounted at
the rear opening thereof. The front casing 8 is provided with a
handle 10 at the top surface and an intake port 11 at the front
surface. The front casing 8 is removably secured to the front end
of the rear casing 1 by detent and groove connection 12 and locking
means 13. The cord takeup means 3 comprises a reel frame 15 for
winding a length of power supply cord 14 therearound, a spiral
spring 17 adapted to rotate the reel frame 15 about a fixed shaft
16 with an energy charged during withdrawal of the power supply
cord 14, and a brake mechanism 18 for stopping the rotation of the
reel frame 15. The numeral 19 shows a power transmission shaft
rotatably supported in the rear casing 1. The shaft 19 is provided
at its rear end with a small gear 20 which is in meshing engagement
with a large gear 21 formed on the outer periphery of the reel
frame 15, so that the rotation of the reel frame 15 is multiplied
and transmitted to the shaft 19. The numeral 22 shows a clutch
member secured to the front end of the power transmission shaft 19,
and 23 a crankshaft which is rotatably supported on a support plate
26 and has an eccentric front end 24. The numeral 25 shows a
filter-cleaning member having a central shaft 28 inserted into the
slot 27 of the support plate 26. The member 25 is transversely
movable along the slot 27 and has a plurality of substantially
conically shaped projections 29 for beating a plurality of
longitudinally extending pleats 31 substantially perpendicularly
thereto at their crests so as to apply deflection and vibration to
a main filter 30 to shake off the dust on the filter. The numeral
32 shows a crank arm having one end connected to the shaft 28 of
the filter-cleaning member 25 and the other end pivotally connected
to the front end 24 of the crankshaft 23. The arm 32 is
transversely reciprocated in response to the rotation of the
crankshaft 23 with an amplitude corresponding to the eccentricity
of the front end 24 of the crankshaft 23, so that the
filter-cleaning member 25 is correspondingly reciprocated. The
numeral 33 shows a second clutch member mounted on the rear end of
the crankshaft 23. The clutch member 33 is axially slidable
relative to the crankshaft 23 but rotates therewith. A coil spring
34 biases the clutch member 33 toward the clutch member 22 so as to
engage therewith. The clutch means constituted by the clutch
members 22 and 33 is a one way clutch which transmit the rotation
only when the power supply cord 14 is being drawn out but slips
when the cord 14 is being taken out. Thus, when the power supply
cord 14 is being taken out, the rotation of the reel frame 15 is
transmitted through the gears 21 and 20, the power transmission
shaft 19, the clutch members 22 and 33, the crankshaft 23 and the
crank arm 32 to the filter-cleaning member 25 so as to transversely
reciprocate it. On the other hand, when the power supply cord 14 is
being taken up, the rotation of the reel frame 15 is transmitted
through the gears 21 and 20, and the power transmission shaft 19 to
the clutch member 22, however, since the clutch member 33 is
rearwardly forced against the action of the coil spring 34 when the
clutch member 22 is rotated, the members 22 and 33 slip with each
other so that the rotation is not transmitted to the
filter-cleaning member 25.
The purpose of this arrangement is, as briefly explained
previously, to secure smooth rotation of the reel frame 25 when the
power supply cord 14 is being taken up by reducing the frictional
resistance between the filter-cleaning member 25 and the main
filter 30 so that the electric cord 14 can be completely taken up.
Thus, by this arrangement, the filter-cleaning operation can be
performed without having any adverse effects on the function of the
cord takeup means 3 since the filter-cleaning member 25 is actuated
only when the power supply cord 14 is being drawn out.
The reference numeral 35 shows a guide shaft for the
filter-cleaning member 25, and 36 shows a leaf spring secured at
its intermediate portion to the rear surface of the filter-cleaning
member 25 and having end portions 37 curved toward the support
plate 26 and pressed onto the surface of the support plate 26.
Thus, the leaf spring 36 biases the filter-cleaning member 25
toward the filter 30 with a biasing force which is smaller than the
force acting on the member 25 from the filter 30 when the
projections 29 of the member 25 pass on the pleats 31 of the filter
30.
Therefore, when the projections 29 of the filter-cleaning member 25
pass over the crests of the pleats 31 of the filter 30, the main
filter 30 is deflected and, at the same time, the leaf spring 36 is
deformed as shown by dotted lines in FIG. 4. After the projections
29 of the member 25 pass through the crests of the filter pleats
31, the member 25 is returned under the action of the leaf spring
36 from the position shown by dotted lines to that shown by solid
lines in FIG. 4. Thus, as the projections 29 of the member 25 pass
through the crest portions of the filter pleats 31, they apply
transverse and forward beats to the filter 30. Accordingly, if the
filter-cleaning member 25 is reciprocated with a high speed, the
main filter 30 is subjected to an intense vibration.
The reference numeral 38 shows a stopper provided on the shaft 28
of the filter-cleaning member 25 for maintaining a minimum distance
between the member 25 and the support plate 26. The numeral 39
shows a primary filter which is coarser than the main filter and
removably mounted on the front opening of a dust hopper 40. The
numeral 41 shows a packing ring for supporting the periphery of the
rear end of the hopper 40 as well as the upper and lower ends of
the main filter 30, so that the primary filter 39, the dust hopper
40 and the main filter 30 are connected together. The numeral 42
shows a dust collecting chamber provided within the hopper 40 for
collecting the dust removed from the main filter 30 by the member
25 and dropped through the space between each pleat 31. The numeral
43 shows a partition wall interrupting the front opening of the
dust collecting chamber 42 for preventing the air flow from
entering said chamber. Thus, the partition wall 43 serves to
prevent the dust in the chamber 42 from being flown up by the air
flow toward the main filter 30. By this arrangement, the necessity
for disposing the dust collected in the chamber 42 can be reduced,
since it would only be necessary to dispose the dust only when the
chamber 42 became full of the dust. Accordingly, the usage of the
dust-collecting chamber 42 can be promoted.
FIGS. 7 to 9 show the second embodiment of the present invention,
in which corresponding parts are designated by the same reference
numerals used in the first embodiment and the detailed explanations
thereof are omitted. The specific features of this embodiment will
now be described.
In this embodiment, a gear 20' is provided at the front end of the
power transmission shaft 19 and meshes with teeth 45 formed on the
outer periphery of a circular filter-cleaning member 25' which is
rotatably supported on the support plate 26 by a shaft 44 formed
thereon. Thus, the rotation of the cord takeup means 3 is
transmitted through the gear 20, the power transmission shaft 19
and the gear 20' to the filter-cleaning member 25'. The numeral 29'
shows a plurality of conical projections provided on the member 25'
for beating the crests of the pleats 31 of the main filter 30 so as
to give deflection and vibration to the filter. In this case, the
filter-cleaning member 25' is rotated and beats, by its projections
29', the crests of the pleats 31 of the filter 30. Since the pleats
are of substantially triangular cross section and extend
longitudinally, the projections 29' of the member 25' abut the
pleats 31 substantially perpendicularly thereto. Thus, by this
arrangement, a similar operation to the first embodiment can be
obtained. In this embodiment, it is preferred to make the outer
diameter of the filter-cleaning member 25' as small as possible,
because an excessively large diameter of the filter-cleaning member
25' will not provide a sufficient multiplication of the speed. Even
if the diameter of the member 25' is small, a sufficient result
will be obtained by increasing the number of the projections
29'.
In the first embodiment, when the blower 2 is started, the air is
taken into the front casing 8 through the intake port 11 as shown
by an arrow in FIG. 2, and passes through the primary filter 39,
the main filter 30, the air passage holes 6 and the blower 2, and
exhausted through the exhaust port 5. The arrows in FIG. 2 show the
air flow path.
The dust contained in the intake air is captured by the primary
filter 39 which captures large particles of the dust to collect
them in the front casing 8 and thereafter by the main filter 30
which captures fine particles passed through the primary filter
39.
The dust collected by the dust-collecting means 9 is removed as
follows.
When the power supply cord 14 is drawn out, the reel frame 15 is
rotated, and the rotation is transmitted through the gears 21 and
20, the crankshaft 23 and the crank arm 32 to the filter-cleaning
member 25. Thus, the member 25 is reciprocatingly moved with an
amplitude corresponding to the eccentricity of the front end 24 of
the crankshaft 23 and beats, by its projections 29, the crests of
the pleats 31 of the main filter 30 to cause the vibration of the
filter. The dust on the main filter 30 is thus removed therefrom
and collected in the dust-collecting chamber 42 of the hopper
40.
The large particles collected in the front casing 8 and the fine
particles in the chamber 42 are disposed as follows.
The locking means 13 of the body is unlocked and the front casing 8
is disconnected from the rear casing 1. Then, the front casing 8 is
carried to a desired location with the main filter 30 and the
primary filter 39 housed therein. Thereafter, the main filter 30
and the primary filter 39 are taken out of the casing 8 and the
large particles are disposed from the rear opening of the casing.
Then, the primary filter 39 is opened and the fine particles in the
chamber 42 are disposed.
It should be noted that the fine dusts in the chamber 42 should not
necessarily be disposed every time when the large particles are
disposed.
According to this embodiment of the present invention, as the power
supply cord 14 is drawn out to operate the vacuum cleaner, the
rotation of the reel frame 15 is utilized to move the
filter-cleaning member 25 so that the fine dusts on the main filter
30 is removed therefrom. Since the fine dusts removed from the main
filter are collected in the chamber 42 and they are prevented, by
the partition wall 43, from being flown up by the air flow, the
vacuum cleaner can be used without disposal of the collected fine
dusts until the chamber 42 becomes full of fine dusts.
Further, by providing the chamber 42 below the hopper 40 having the
main filter 30 housed therein and by providing the partition wall
43 with the frame of the primary filter 39 closing the front
opening of the hopper 40, the structure can be made very simple
and, since the fine particles are not disposed simultaneously when
the large particles are captured by the primary filter 39 the
cleaner can be handled without dusting.
* * * * *