CA1053862A - Vacuum cleaner having automatic filter cleaner - Google Patents
Vacuum cleaner having automatic filter cleanerInfo
- Publication number
- CA1053862A CA1053862A CA243,342A CA243342A CA1053862A CA 1053862 A CA1053862 A CA 1053862A CA 243342 A CA243342 A CA 243342A CA 1053862 A CA1053862 A CA 1053862A
- Authority
- CA
- Canada
- Prior art keywords
- dust removing
- dust
- vacuum cleaner
- case
- set forth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/20—Means for cleaning filters
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/26—Incorporation of winding devices for electric cables
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filters For Electric Vacuum Cleaners (AREA)
- Electric Vacuum Cleaner (AREA)
- Electric Suction Cleaners (AREA)
Abstract
A VACUUM CLEANER
ABSTRACT OF THE DISCLOSURE
A vacuum cleaner including a filter having a fine mesh and received in a dust case, and a cord reel received in a case for automatically winding a cord by the force of a coil spring. In this vacuum cleaner, a dust removing mechanism is automatically driven by utilizing the turning force of the cord reel generated by rolling up and drawing the cord to remove the dust clinging to the aforesaid filter therefrom.
ABSTRACT OF THE DISCLOSURE
A vacuum cleaner including a filter having a fine mesh and received in a dust case, and a cord reel received in a case for automatically winding a cord by the force of a coil spring. In this vacuum cleaner, a dust removing mechanism is automatically driven by utilizing the turning force of the cord reel generated by rolling up and drawing the cord to remove the dust clinging to the aforesaid filter therefrom.
Description
BACKGROU~D OF THE INVENTION
This invention relates to a vacuur cleaner for automatically removing dust clinging to a filter by utilizing the turning force of a cord reel.
With the prior art vacuum cleaner of this type, there has been proposed an attempt to operate a dust removing mechanism upon drawing and winding a length of a cord from or around a cord reel. However, such an a.ttempt suffers from a shortcoming in that a coil spring having a large amount cf torque is required to wind the cord around the cord reel with the result of increasing the force to draw the cord out of the cord reel. For this reason, the dust removing mechanism is operable onl~ upon dra.wing out a cord from the reel, and is inoperable upon winding the cord around the reel ~ , .
.. , .. . . ~ .. . . ... ... . .
1053~36Z
1 so tha.t the spring built in the cord reel is used only for the purpose of winding the cord around the reel.
However, the cord is normally drawn from the cord reel prior to starting up cleaning, so that the dust clinging to the filter during the cleaning can not automa.tically be removed after the completion of clea.ning with the cleaner of the above-mentioned construction. -Accordingly, in order to efficiently remove the dust clinging to the filter, it is desirable to remove the dust from the filter both upon dra.wing a.nd winding a cord, that is, before and after the cleaning opera.tion. ~;
~ . .
S~ARY OF THE INVENTION
It is an object of the present invention to provide a vacuum cleaner which can automatically remove `.
dust clinging to a filter upon drawing and winding a cord without the need of increasing a torque required for a spring built in a cord reel.
To attain the above-mentioned object, the present invention has a feature in that the rotational .
20 speed of a dust removing element for slidingly striking .:
the back surface of a.filter body is smaller than that .
of a cord reelO
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a longitudinal cross-sectional view of a vacuum cleaner according to the present invention;
Fig. 2 is an exploded perspective view of a dust case section;
Fig. 3 is an exploded perspective view of a.
3 ~S386Z `
1 body case; ~ r Fig. 4 is a cross-sectional view of the essential portion of a cord reel portion;
Fig. 5 is an exploded perspective view of the cord reel section;
Fig. 6 is an enlarged perspective view of -the essential part of a coupling section;
Fig. 7 is an enlarged cross-sectional view showing the coupling section in an engaged condition; ~ -Fig. 8 is an enlarged cross-sectional view taken along a line I-I of Fig. l; c ~ ; ~
Fig. 9 is a cross-sectional view taken along -a line II-II of Fig. 8;
Fig. lC is an enlarged view of the coupling section of Fig. l;
Fig. 11 is a perspective view of a packing; ;-:, .
Fig. 12 is an enlarged view of the essential part of a filter device;
Fig. 13 is an enlarged perspective view of -~
the essential part of the filter device of Fig. 2;
Fig. 1~ is an enlarged view taken along a line III-III of Fig. 2;
- Fig. 15 is a view showing the operation of the filter device according to the present invention Flg. 16 is a view showing the operations of the dust removing means and a transmission means;
Fig. 17 is a view showing the operation of a -~
dust removing element;
Fig, 18 is a cross-sectional view of the dust removing element;
,
This invention relates to a vacuur cleaner for automatically removing dust clinging to a filter by utilizing the turning force of a cord reel.
With the prior art vacuum cleaner of this type, there has been proposed an attempt to operate a dust removing mechanism upon drawing and winding a length of a cord from or around a cord reel. However, such an a.ttempt suffers from a shortcoming in that a coil spring having a large amount cf torque is required to wind the cord around the cord reel with the result of increasing the force to draw the cord out of the cord reel. For this reason, the dust removing mechanism is operable onl~ upon dra.wing out a cord from the reel, and is inoperable upon winding the cord around the reel ~ , .
.. , .. . . ~ .. . . ... ... . .
1053~36Z
1 so tha.t the spring built in the cord reel is used only for the purpose of winding the cord around the reel.
However, the cord is normally drawn from the cord reel prior to starting up cleaning, so that the dust clinging to the filter during the cleaning can not automa.tically be removed after the completion of clea.ning with the cleaner of the above-mentioned construction. -Accordingly, in order to efficiently remove the dust clinging to the filter, it is desirable to remove the dust from the filter both upon dra.wing a.nd winding a cord, that is, before and after the cleaning opera.tion. ~;
~ . .
S~ARY OF THE INVENTION
It is an object of the present invention to provide a vacuum cleaner which can automatically remove `.
dust clinging to a filter upon drawing and winding a cord without the need of increasing a torque required for a spring built in a cord reel.
To attain the above-mentioned object, the present invention has a feature in that the rotational .
20 speed of a dust removing element for slidingly striking .:
the back surface of a.filter body is smaller than that .
of a cord reelO
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a longitudinal cross-sectional view of a vacuum cleaner according to the present invention;
Fig. 2 is an exploded perspective view of a dust case section;
Fig. 3 is an exploded perspective view of a.
3 ~S386Z `
1 body case; ~ r Fig. 4 is a cross-sectional view of the essential portion of a cord reel portion;
Fig. 5 is an exploded perspective view of the cord reel section;
Fig. 6 is an enlarged perspective view of -the essential part of a coupling section;
Fig. 7 is an enlarged cross-sectional view showing the coupling section in an engaged condition; ~ -Fig. 8 is an enlarged cross-sectional view taken along a line I-I of Fig. l; c ~ ; ~
Fig. 9 is a cross-sectional view taken along -a line II-II of Fig. 8;
Fig. lC is an enlarged view of the coupling section of Fig. l;
Fig. 11 is a perspective view of a packing; ;-:, .
Fig. 12 is an enlarged view of the essential part of a filter device;
Fig. 13 is an enlarged perspective view of -~
the essential part of the filter device of Fig. 2;
Fig. 1~ is an enlarged view taken along a line III-III of Fig. 2;
- Fig. 15 is a view showing the operation of the filter device according to the present invention Flg. 16 is a view showing the operations of the dust removing means and a transmission means;
Fig. 17 is a view showing the operation of a -~
dust removing element;
Fig, 18 is a cross-sectional view of the dust removing element;
,
- 2 -, l Fig. 19 is a view showing the operation of the prior art dust removing means;
Figs. 20 and 21 are plots showing the relation-ship between the dust collecting capacity and a suction force;
Fig. 22 is an enlarged view of a filter body;
Fig. 23 is an enlarge view of the prior art filter body;
Fig. 24 is a view showing a filter body according to the present inve~tion; and Fig. 25 is a view showing the operation of the prior art filter body. `
:
DESCRIPTION OF THE PRRFERRED EMBODIMENTS
These and other objects and features of the present invention will be apparent from reading the following explanation with reference to the accompanying drawings.
Referring to Figs. l and 3, there is shown at 1 a main body case made of a synthetic resin. The case 1 is of a split type, and thus consists of a lefthand case lb and a righthand case la~ and is formed - integrally with a first handle 2. Sho~n at 3 and 4 are -ribs which are provided in facing relation to each , other within the lefthand and righthand cases lb, la, and serve to divide the interior of the case l into a chamber 5 for an electric blower, a chamber 6 for a -cord reel, and an exhaust chamber 7. Cushion rubbers designated by the reference-numerals 8 and 9 serve to support an electric blower lO within the electric blower
Figs. 20 and 21 are plots showing the relation-ship between the dust collecting capacity and a suction force;
Fig. 22 is an enlarged view of a filter body;
Fig. 23 is an enlarge view of the prior art filter body;
Fig. 24 is a view showing a filter body according to the present inve~tion; and Fig. 25 is a view showing the operation of the prior art filter body. `
:
DESCRIPTION OF THE PRRFERRED EMBODIMENTS
These and other objects and features of the present invention will be apparent from reading the following explanation with reference to the accompanying drawings.
Referring to Figs. l and 3, there is shown at 1 a main body case made of a synthetic resin. The case 1 is of a split type, and thus consists of a lefthand case lb and a righthand case la~ and is formed - integrally with a first handle 2. Sho~n at 3 and 4 are -ribs which are provided in facing relation to each , other within the lefthand and righthand cases lb, la, and serve to divide the interior of the case l into a chamber 5 for an electric blower, a chamber 6 for a -cord reel, and an exhaust chamber 7. Cushion rubbers designated by the reference-numerals 8 and 9 serve to support an electric blower lO within the electric blower
- 3 -j .- ~- . . - , . - . . ,, , .. :
~5386Z
chamber 5. A shielding plate l] fabrica.ted of steel is interposed between the rib 3 and the cushion rubber 9. A reel supporting plate 12 of a 'U' shape intimately contacts the rib 4. A dust portion 13 is defined by ~.
the reel supporting plate 12 and shielding pla.te 11 :
for introducing or guiding air flow from the electric ~:
blower chamber 5 to the exhaust chamber 7. Shown at 14 is a contact mount which is secured, together with the .-reel shaft 15, to the reel supporting plate 12 by means of a screw 30. Shown at 16 is a cord reel which is rotatably supported on the reel shaft 15. Provided on .
the side wall of the cord reel 16 is a braking ring 19 for a stopper 18 which is adapted to limit the winding operation of the cord 17. Shown at 20 is a coil spring, 15 whose one end is secured to the reel shaft 15 and whose ~:
other end is secured to the cord reel 16. The winding .. ..
operation of the cord 17 is effected by means of the .`~
pre-loaded coil spring 20. ~
Designated by the reference numeral 21 is ^ : .
20 a transmission means which consists of a first gea.r 21a integrally formed on the side wall of the cord reel -.
16; a drive gear 22 fabricated of a synthetic resin .
for meshing with the first gear 21a.; a face gear 24 fabricated of a synthetic resin for meshing with the 25 drive gear 22 and turning the direction of a. rota.ry shaft 23 of the gear 22 through an angle of 90;
and a drive coupling 26 integral with the face gea.r 24. .- .. -.
The respective components of sa.id transmission means are all secured on the cord reel supporting plate 12, :
30 as shown in Figs. 4 and 5.
, _ 1~ _ ~, , ~ ~ 5 3 ~6 Z
1 Provided in the eord reel supporting plate 12, as best shown in Fig. 5, are an attaching hole 27 for the cord reel 16 and contact mount 14, an attaching -hole 28 for the face gear 24, and an attaching hole 29 for the drive gear 22. As shown in Fig. 4, angles ~, a g s ~1~ Q2~ ~3~ Q4 have close bearing on the engagement of the respective parts and are dependent merely on the accuracy of the cord reel supporting plate alone. The contaet mount 14 and cord reel 16 are secured 10 by means of a screw 30 to the cord reel supporting plate ~-12. Rotary shafts 23, 25~ as best shown in Fig. 4, are secured to the eord reel supporting plate 12.
Turning to Figs. 1 and 2, shown at 31 is a dust indieator for indieating the eondition of dust being eollected. The dust indieator is positioned within the handle portion 2 of the case 1 by means of an indieator attaehing tube 32. Shown at 33 are air exhaust openings 33 for discharging air flow from the ~ -exhaust air chamber 7 outside the case 1. A elean filter 34 is positioned inwardly of the exhaust openings 33.
The elean filter 34 is intended for the dual purposes of reetifying the air flow and arresting the sound, and is fabrieated of a porous material sueh as urethane foam and the like. Shown at 35 in Figs. 1 and 2 is a 25 dust ease made of a syntehtie resin, whieh eollects ',t therein the dust being fed through a hose not shown.
The interior of the dust case 35 is divided into a rough dust chamber 37 and fine dust chamber 38 by means of the rib 36. As is clear from Fig. 1, shown at 39 is a suction port? to which is connected a hose, and at 40 a iO5386Z ::
1 reverse flow preventive or check valve provided in the suction port 39. Shown at 41 in Fig. 2 is a second handle portion which is secured to the dust case 35 by means of screws 41a and 41b Referring to Figs. 1 and 2, shown at 43 is a movable locking portion adapted to removably attach the dust case 35 to the main body case 1, and the locking portion 43 consists of a locking piece 43a and a spring 43b. The locking piece 43a is slidingly fitted in the second handle portion 41.
As shown in Fig. 1, a filter means 44 is removably fitted in an opening in the dust case 35, and consists of a net filter 45 made of synthetic resin, a filter body 46, a dust removing assembly 47 and a pack-ing 48 for h~lding same.
The dust removing assembly 47 includes a dust removing element 49 adapted to slidingly strike the back surface of a filter-body 46j a dust removing gear 50 fabricated of synthetic resin, a transmission gear 51 fabricated of synthetic resin for meshing with -the dust removing gear 50, a force receiving coupling 53 fabricated of synthetic resin and fitted on a shaft 52 of the - transmission gear 51, and a supporting plate 54 having - a plurality of drag openings or slits 54a, as seen in 25 Fig. 12.
- ~s indicated in Figs. 8 and 9, the stopper ;
means 60 consists of a stopper 18, a lever 62 mounting same thereon so as to allow pivotal movement of the stopper 18, a spring 63 for pulling the lever 62 in the direction of an arrow Po, and a braking wall 65 which : ' .
~053~
1 defines a wedge shaped space 64 together with the braking ring 19 and is adapted-to brake the cord reel 16 with the aid of the braking ring 19 with the stopper 18 maintained bit therebetween, i.e., in the space 64.
Shown at 66 is a screw for sècuring the braking wall 65 to the main body case 1, and at 67 a pedal for forcing the stopper 18 in the direction of an arrow Qo to release the cord reel 16 from the braked condition to wind the cord 17 therearound. The pedal 67 is pivotally supported by means of a pin 68.
As shown in Figs. 10 and 11, a packing 48 includes a peripheral packing portion 48a which is fitted around the filter body 46, thereby removably holding the ~ilter means 44 against the dust case 35 in air tight relation; and a packing portion 48b interposed between the supporting body 54 and a front wall lc of the case 1. -The packing 48 serves to efficiently help suck the dust carried by the air flow which have been produced due to a vacuum or negative pressure P2 within ~he dust case 35, rather than due to the atmospheric pressure Pl when the dust case 35 is installed in the case 1 and the electric blower 10 is maintained in operation. -Referring to Fig. 18~ a striking portion 49a is formed by bending the end of a wire such as a piano wire into an arcuate or spherical form, and the remain-ing portion of the wire serves as a dust removing body portion 49b. A dust removing element 49 consists of the striking portion h9a thus formed and the dust removing i~386Z :
1 body portion ~9b. The other end of the dust removing body portion 49b is bent into a screw-retaining portion 49c. The dust-removing element 49 is secured to the dust removing gear 50 by securing the screw-retaining portion 4~c to the dust removing gear by means of a -screw 70. Provided in the stri~ing portion 49a is a protective material 49d made of a resilient resin and the like.
Shown at 53a in Figs. 6 and 7 is a projection formed on the force receiving coupling 53, while the outer peripheral portion of the projection 53a is chamfered in view of safety in the case of the rotation of the projection exposed. Shown at 69 is a pin which has been press fitted in the shaft 52 for transmitting a drive force by engaging the rib 53b. Shown at 26a is a groove defined in the drive coupling 26, while the projection 53a is fitted in the groove 26a to thereby -transmit a torque. In addition, the edge 26b of the groove 26a is chamfered in view of safety, while the width of the groove 26a is set to less than 10 mm so as not to allow a finger to be inserted therein. The outer peripheral portion 26c of the drive coupling 26 is chamfered in view of safety in the rotating condition thereof and for facilitating the engagement between the driven coupling 53 and the drive coupling 26 upon installing the dust case 35.
In Fig. 7, 'J' represents an axis of rotation of the driven coupling 53, 'H' an axis of rotation of the drive coupling 26, and ~ a deviation between the both axes of rotation J and H which has been caused by 1~386Z
l the sum of the dimensional tolerances of the respective parts. 'G' represents -a locus described by the tip 'F' of the projection 53a at the time of the attachment or removal of the dust case 35., and '~' does the maximum 5 deviation of the locus 'G'. The difference in width between the projection 53a and the groove 26a is determined so a.s to be larger than twice the sum of .
'~' and '~'. As a result, there may not take place an excessive loss of torque and damage on the dust case lO 35 due to the diviation 'S' between the axes of rotation 'J' and 'H'. ~:
Upon installation of the dust case 35 to the ;
main body case l, the driven coupling 53 is placed so as to abut the drive coupling 26 from above obliquely.
15 However, the driven coupling 53 is readily fitted to the drive coupling 26 because of the chamfered outer .
peripheral portions 26c and 53c, while compressing the .
spring 41, thereby bringing the dust case 35 into engagement with the main body case l. Thereafter~ when 20 the drive coupling 53 is also rotated in an idle condition mtil the position of the projection 53a coincides with the position of the groove 26aO Thus, a torque can be - transmitted thereafter. .
- The dust removing assembly 47 is positioned 25 in the rear of the filter body 46. The dust removing gear 50 is rotatably mounted on the supporting pla.te 54 and mounts thereon a dust removing element 49 adapted to slide on the rear surface of the filter body 46. :
A rotary disc 55 is secured to the hub portion ..
30 50a of the dust-removing gea.r 50 by means of a screw 55a.
- _ 9 _ -' - .
~0~;~86~ `~
1 to rotate the gear 50, and integra.lly mounts a knob 56 thereon. The dust removing knob 56 is manually opera.ble -only when the dust case 35 is removed from the main .
body case 1. .:
The transmission gear 51 is rigidly secured on the shaft 52 according to press-fitting or by means .. :
of a screw, and attached to the supporting plate 54 ~
in such a manner as to mesh with the dust removing gear 50. .
The engagement of the driven coupling 53 with the drive coupling 26 on the slde of the ma.in body ca.se 1 permits turning force of the cord reel 16 to be transmitted to the dust removing element 49 by way of ;~ -gear 21, drive gear 22, face gear 24~ drive coupling 26, :-driven coupling 53, transmission gear 51, and dust removing gear 50, so that the dust removing element 49 is rotated to rub the rear surfa.ce of the filter body 46. Shown at 58 are tra.velling wheels mounted on the case 1, and at 59 is a travelling wheel mounted on the dust case 35.
As shown in the drawings, assume Nl as the number of teeth of the gea.r 21 mounted on the cord reel 16, N2 as the number of teeth of the drive gear 22, N3 as the number of teeth of the face gear 24, N~ as the number 25 of teeth of the transmission gear 51, and N5 as the -number of teeth of the dust removing gear 50. Then?
the rotational speed of the shaft 50a of the dust-removing gea.r 50 can be given by multiplying the ~ -rotational speed of the rotary shaft 16 of the cord ..
N x N
reel 16 by ~ .
-105386~2 1 Accordingly, if the value f N1 x N4 is ]ess than 1, then the rotational speed of the dust-removing gear 50 is less than that of the cord reel 16.
In order to accomodate the transmission means 21 and the dust removing means 47 within the case 1 of a practical size and the dust case 35, respectively, it is desirable to render the value of N x N
Nl x N4 between 1/2 and 1/5. In the embodiment, the numbers Nl, N2, N3, N4 and N5 of teeth of the respective gears are 53, 13, 41, 13 and 70, respectively.
The filter body 46 consists of a corrugated filter medium 46a, and a frame body 46b made of synthetic resin and holding the corrugated filter medium 46a.
Provided in the groove portions of the corrugations of the corrugated filter medium 46a, i.e., on the side opposite to the side of the filter, which is rubbed by the dust removing element 49, i.e., in the corners right behind the ridge 46c of the corrugated filter medium 46a are spacers 71 having a triangular cross section and made of synthetic resin. As shown in Fig. 13, ~ ~ there are provided reinforcing members 46d on the ridges of the corrugations of the corrugated filter medium 46a on the side opposite to the side of the corrugation, which ~
is rubbed by the dust removing element 49. ;
~he spacers 71 and the reinforcing members ~ 46b are connected by connecting ribs 46e, as best - shown in Figs. 12 to 14.
Shown at 72 is a plug for a potential source, which is secured to the end of the cord 17, and shown at 73 is a cover for an opening 74 for drawing out the .. . .
-:~S3~6Z
1 cord 17 therethrough. A transparent cover 75 for a dust indicator 31 is positioned in the first handle portion 2.
The cord reel 16 includes upper and lower side plates 16a, 16b which are provided separately and secured in position by means of a screw 76.
A condensor 77 is secured to the electric blower 10 by means of a supporting piece 78 and a ~-screw 79. A carbon brush is designa-ted by the reference ;
numeral 80.
Shown at 81 is a screw which couples together the lefthand and righthand cases lb and la, and at 82 a change - over switch secured to the rear, top surface of the main body case 1 by means of a metal piece 83 to select either of the watt consumptions 450 watt and 600 watt.
Wheels 59 are attached to the undersurface of the dust case 35 by means of a support plate 84,~`
washer 85, screw 86 and nut 87. A check valve 40 is -20 attached in position in the air intake opening by means i-of a spring 88. An air intake opening cover 90 is -~
attached to the front surface of the dust case 35 by means of a screw 89. A packing 91 is used for sealing between the intake air-opening cover 90 and the dust case 35. A lead wire 92 is provided for the remote control of a manual switch and provided on a hose to be inserted into the intake air opening 39. The lead wire 92 is received within the second handle 41. Shown at 93 is a remote control relay, and at 94a, 94b, 94c and 94d silencing members positioned on the outer , , :
1 periphery of the electric blowel 10 and made of a flame proof material. Sho~.n at 95 is a stationary locking `;
portion.
With the above-mentioned arrangement~ when the electric blower 10 is operatedj then the dust which ha.s been introduced through the air inta.ke opening 39 is removed or remains on the net filter 45 and filter 46.
The air flow which has passed through the filter 46 travels through the exhaust air chamber 7 from the ..
exhaust opening 33 outside the ma.in body case 1, while cooling the electric blower 10 on their way to outside.
The rough dust is collected in the rough dust chamber 37 by means of the net filter 45, while fine dust is collected in a fine dust chamber 38 by means of the filter 45.
The drawing out or winding of the cord 17 causes the cord reel 16 to rota.te. The rotation of the .
cord reel 16 is transmitted to the dust removing :
element 49 by way of first gear 21, drive gear 22, fa.ce gear 24, drive coupling 26, driven coupling 53, transmis-sion gear 51, and dust removing gear 50, thus rotating the dust removing element 49. ;
The dust removing element 49 rubs the back .
surface of the filter body 46 during its rotation, so that the dust clinging to the filter body 46 drops in the fine-dust chamber 38.
The shaft of the dust removing gea.r 50 for rotating the dust removing element 49 produces a. torque~
. N x N
of which value amounts to -3'~ , that is, approxima.tely
~5386Z
chamber 5. A shielding plate l] fabrica.ted of steel is interposed between the rib 3 and the cushion rubber 9. A reel supporting plate 12 of a 'U' shape intimately contacts the rib 4. A dust portion 13 is defined by ~.
the reel supporting plate 12 and shielding pla.te 11 :
for introducing or guiding air flow from the electric ~:
blower chamber 5 to the exhaust chamber 7. Shown at 14 is a contact mount which is secured, together with the .-reel shaft 15, to the reel supporting plate 12 by means of a screw 30. Shown at 16 is a cord reel which is rotatably supported on the reel shaft 15. Provided on .
the side wall of the cord reel 16 is a braking ring 19 for a stopper 18 which is adapted to limit the winding operation of the cord 17. Shown at 20 is a coil spring, 15 whose one end is secured to the reel shaft 15 and whose ~:
other end is secured to the cord reel 16. The winding .. ..
operation of the cord 17 is effected by means of the .`~
pre-loaded coil spring 20. ~
Designated by the reference numeral 21 is ^ : .
20 a transmission means which consists of a first gea.r 21a integrally formed on the side wall of the cord reel -.
16; a drive gear 22 fabricated of a synthetic resin .
for meshing with the first gear 21a.; a face gear 24 fabricated of a synthetic resin for meshing with the 25 drive gear 22 and turning the direction of a. rota.ry shaft 23 of the gear 22 through an angle of 90;
and a drive coupling 26 integral with the face gea.r 24. .- .. -.
The respective components of sa.id transmission means are all secured on the cord reel supporting plate 12, :
30 as shown in Figs. 4 and 5.
, _ 1~ _ ~, , ~ ~ 5 3 ~6 Z
1 Provided in the eord reel supporting plate 12, as best shown in Fig. 5, are an attaching hole 27 for the cord reel 16 and contact mount 14, an attaching -hole 28 for the face gear 24, and an attaching hole 29 for the drive gear 22. As shown in Fig. 4, angles ~, a g s ~1~ Q2~ ~3~ Q4 have close bearing on the engagement of the respective parts and are dependent merely on the accuracy of the cord reel supporting plate alone. The contaet mount 14 and cord reel 16 are secured 10 by means of a screw 30 to the cord reel supporting plate ~-12. Rotary shafts 23, 25~ as best shown in Fig. 4, are secured to the eord reel supporting plate 12.
Turning to Figs. 1 and 2, shown at 31 is a dust indieator for indieating the eondition of dust being eollected. The dust indieator is positioned within the handle portion 2 of the case 1 by means of an indieator attaehing tube 32. Shown at 33 are air exhaust openings 33 for discharging air flow from the ~ -exhaust air chamber 7 outside the case 1. A elean filter 34 is positioned inwardly of the exhaust openings 33.
The elean filter 34 is intended for the dual purposes of reetifying the air flow and arresting the sound, and is fabrieated of a porous material sueh as urethane foam and the like. Shown at 35 in Figs. 1 and 2 is a 25 dust ease made of a syntehtie resin, whieh eollects ',t therein the dust being fed through a hose not shown.
The interior of the dust case 35 is divided into a rough dust chamber 37 and fine dust chamber 38 by means of the rib 36. As is clear from Fig. 1, shown at 39 is a suction port? to which is connected a hose, and at 40 a iO5386Z ::
1 reverse flow preventive or check valve provided in the suction port 39. Shown at 41 in Fig. 2 is a second handle portion which is secured to the dust case 35 by means of screws 41a and 41b Referring to Figs. 1 and 2, shown at 43 is a movable locking portion adapted to removably attach the dust case 35 to the main body case 1, and the locking portion 43 consists of a locking piece 43a and a spring 43b. The locking piece 43a is slidingly fitted in the second handle portion 41.
As shown in Fig. 1, a filter means 44 is removably fitted in an opening in the dust case 35, and consists of a net filter 45 made of synthetic resin, a filter body 46, a dust removing assembly 47 and a pack-ing 48 for h~lding same.
The dust removing assembly 47 includes a dust removing element 49 adapted to slidingly strike the back surface of a filter-body 46j a dust removing gear 50 fabricated of synthetic resin, a transmission gear 51 fabricated of synthetic resin for meshing with -the dust removing gear 50, a force receiving coupling 53 fabricated of synthetic resin and fitted on a shaft 52 of the - transmission gear 51, and a supporting plate 54 having - a plurality of drag openings or slits 54a, as seen in 25 Fig. 12.
- ~s indicated in Figs. 8 and 9, the stopper ;
means 60 consists of a stopper 18, a lever 62 mounting same thereon so as to allow pivotal movement of the stopper 18, a spring 63 for pulling the lever 62 in the direction of an arrow Po, and a braking wall 65 which : ' .
~053~
1 defines a wedge shaped space 64 together with the braking ring 19 and is adapted-to brake the cord reel 16 with the aid of the braking ring 19 with the stopper 18 maintained bit therebetween, i.e., in the space 64.
Shown at 66 is a screw for sècuring the braking wall 65 to the main body case 1, and at 67 a pedal for forcing the stopper 18 in the direction of an arrow Qo to release the cord reel 16 from the braked condition to wind the cord 17 therearound. The pedal 67 is pivotally supported by means of a pin 68.
As shown in Figs. 10 and 11, a packing 48 includes a peripheral packing portion 48a which is fitted around the filter body 46, thereby removably holding the ~ilter means 44 against the dust case 35 in air tight relation; and a packing portion 48b interposed between the supporting body 54 and a front wall lc of the case 1. -The packing 48 serves to efficiently help suck the dust carried by the air flow which have been produced due to a vacuum or negative pressure P2 within ~he dust case 35, rather than due to the atmospheric pressure Pl when the dust case 35 is installed in the case 1 and the electric blower 10 is maintained in operation. -Referring to Fig. 18~ a striking portion 49a is formed by bending the end of a wire such as a piano wire into an arcuate or spherical form, and the remain-ing portion of the wire serves as a dust removing body portion 49b. A dust removing element 49 consists of the striking portion h9a thus formed and the dust removing i~386Z :
1 body portion ~9b. The other end of the dust removing body portion 49b is bent into a screw-retaining portion 49c. The dust-removing element 49 is secured to the dust removing gear 50 by securing the screw-retaining portion 4~c to the dust removing gear by means of a -screw 70. Provided in the stri~ing portion 49a is a protective material 49d made of a resilient resin and the like.
Shown at 53a in Figs. 6 and 7 is a projection formed on the force receiving coupling 53, while the outer peripheral portion of the projection 53a is chamfered in view of safety in the case of the rotation of the projection exposed. Shown at 69 is a pin which has been press fitted in the shaft 52 for transmitting a drive force by engaging the rib 53b. Shown at 26a is a groove defined in the drive coupling 26, while the projection 53a is fitted in the groove 26a to thereby -transmit a torque. In addition, the edge 26b of the groove 26a is chamfered in view of safety, while the width of the groove 26a is set to less than 10 mm so as not to allow a finger to be inserted therein. The outer peripheral portion 26c of the drive coupling 26 is chamfered in view of safety in the rotating condition thereof and for facilitating the engagement between the driven coupling 53 and the drive coupling 26 upon installing the dust case 35.
In Fig. 7, 'J' represents an axis of rotation of the driven coupling 53, 'H' an axis of rotation of the drive coupling 26, and ~ a deviation between the both axes of rotation J and H which has been caused by 1~386Z
l the sum of the dimensional tolerances of the respective parts. 'G' represents -a locus described by the tip 'F' of the projection 53a at the time of the attachment or removal of the dust case 35., and '~' does the maximum 5 deviation of the locus 'G'. The difference in width between the projection 53a and the groove 26a is determined so a.s to be larger than twice the sum of .
'~' and '~'. As a result, there may not take place an excessive loss of torque and damage on the dust case lO 35 due to the diviation 'S' between the axes of rotation 'J' and 'H'. ~:
Upon installation of the dust case 35 to the ;
main body case l, the driven coupling 53 is placed so as to abut the drive coupling 26 from above obliquely.
15 However, the driven coupling 53 is readily fitted to the drive coupling 26 because of the chamfered outer .
peripheral portions 26c and 53c, while compressing the .
spring 41, thereby bringing the dust case 35 into engagement with the main body case l. Thereafter~ when 20 the drive coupling 53 is also rotated in an idle condition mtil the position of the projection 53a coincides with the position of the groove 26aO Thus, a torque can be - transmitted thereafter. .
- The dust removing assembly 47 is positioned 25 in the rear of the filter body 46. The dust removing gear 50 is rotatably mounted on the supporting pla.te 54 and mounts thereon a dust removing element 49 adapted to slide on the rear surface of the filter body 46. :
A rotary disc 55 is secured to the hub portion ..
30 50a of the dust-removing gea.r 50 by means of a screw 55a.
- _ 9 _ -' - .
~0~;~86~ `~
1 to rotate the gear 50, and integra.lly mounts a knob 56 thereon. The dust removing knob 56 is manually opera.ble -only when the dust case 35 is removed from the main .
body case 1. .:
The transmission gear 51 is rigidly secured on the shaft 52 according to press-fitting or by means .. :
of a screw, and attached to the supporting plate 54 ~
in such a manner as to mesh with the dust removing gear 50. .
The engagement of the driven coupling 53 with the drive coupling 26 on the slde of the ma.in body ca.se 1 permits turning force of the cord reel 16 to be transmitted to the dust removing element 49 by way of ;~ -gear 21, drive gear 22, face gear 24~ drive coupling 26, :-driven coupling 53, transmission gear 51, and dust removing gear 50, so that the dust removing element 49 is rotated to rub the rear surfa.ce of the filter body 46. Shown at 58 are tra.velling wheels mounted on the case 1, and at 59 is a travelling wheel mounted on the dust case 35.
As shown in the drawings, assume Nl as the number of teeth of the gea.r 21 mounted on the cord reel 16, N2 as the number of teeth of the drive gear 22, N3 as the number of teeth of the face gear 24, N~ as the number 25 of teeth of the transmission gear 51, and N5 as the -number of teeth of the dust removing gear 50. Then?
the rotational speed of the shaft 50a of the dust-removing gea.r 50 can be given by multiplying the ~ -rotational speed of the rotary shaft 16 of the cord ..
N x N
reel 16 by ~ .
-105386~2 1 Accordingly, if the value f N1 x N4 is ]ess than 1, then the rotational speed of the dust-removing gear 50 is less than that of the cord reel 16.
In order to accomodate the transmission means 21 and the dust removing means 47 within the case 1 of a practical size and the dust case 35, respectively, it is desirable to render the value of N x N
Nl x N4 between 1/2 and 1/5. In the embodiment, the numbers Nl, N2, N3, N4 and N5 of teeth of the respective gears are 53, 13, 41, 13 and 70, respectively.
The filter body 46 consists of a corrugated filter medium 46a, and a frame body 46b made of synthetic resin and holding the corrugated filter medium 46a.
Provided in the groove portions of the corrugations of the corrugated filter medium 46a, i.e., on the side opposite to the side of the filter, which is rubbed by the dust removing element 49, i.e., in the corners right behind the ridge 46c of the corrugated filter medium 46a are spacers 71 having a triangular cross section and made of synthetic resin. As shown in Fig. 13, ~ ~ there are provided reinforcing members 46d on the ridges of the corrugations of the corrugated filter medium 46a on the side opposite to the side of the corrugation, which ~
is rubbed by the dust removing element 49. ;
~he spacers 71 and the reinforcing members ~ 46b are connected by connecting ribs 46e, as best - shown in Figs. 12 to 14.
Shown at 72 is a plug for a potential source, which is secured to the end of the cord 17, and shown at 73 is a cover for an opening 74 for drawing out the .. . .
-:~S3~6Z
1 cord 17 therethrough. A transparent cover 75 for a dust indicator 31 is positioned in the first handle portion 2.
The cord reel 16 includes upper and lower side plates 16a, 16b which are provided separately and secured in position by means of a screw 76.
A condensor 77 is secured to the electric blower 10 by means of a supporting piece 78 and a ~-screw 79. A carbon brush is designa-ted by the reference ;
numeral 80.
Shown at 81 is a screw which couples together the lefthand and righthand cases lb and la, and at 82 a change - over switch secured to the rear, top surface of the main body case 1 by means of a metal piece 83 to select either of the watt consumptions 450 watt and 600 watt.
Wheels 59 are attached to the undersurface of the dust case 35 by means of a support plate 84,~`
washer 85, screw 86 and nut 87. A check valve 40 is -20 attached in position in the air intake opening by means i-of a spring 88. An air intake opening cover 90 is -~
attached to the front surface of the dust case 35 by means of a screw 89. A packing 91 is used for sealing between the intake air-opening cover 90 and the dust case 35. A lead wire 92 is provided for the remote control of a manual switch and provided on a hose to be inserted into the intake air opening 39. The lead wire 92 is received within the second handle 41. Shown at 93 is a remote control relay, and at 94a, 94b, 94c and 94d silencing members positioned on the outer , , :
1 periphery of the electric blowel 10 and made of a flame proof material. Sho~.n at 95 is a stationary locking `;
portion.
With the above-mentioned arrangement~ when the electric blower 10 is operatedj then the dust which ha.s been introduced through the air inta.ke opening 39 is removed or remains on the net filter 45 and filter 46.
The air flow which has passed through the filter 46 travels through the exhaust air chamber 7 from the ..
exhaust opening 33 outside the ma.in body case 1, while cooling the electric blower 10 on their way to outside.
The rough dust is collected in the rough dust chamber 37 by means of the net filter 45, while fine dust is collected in a fine dust chamber 38 by means of the filter 45.
The drawing out or winding of the cord 17 causes the cord reel 16 to rota.te. The rotation of the .
cord reel 16 is transmitted to the dust removing :
element 49 by way of first gear 21, drive gear 22, fa.ce gear 24, drive coupling 26, driven coupling 53, transmis-sion gear 51, and dust removing gear 50, thus rotating the dust removing element 49. ;
The dust removing element 49 rubs the back .
surface of the filter body 46 during its rotation, so that the dust clinging to the filter body 46 drops in the fine-dust chamber 38.
The shaft of the dust removing gea.r 50 for rotating the dust removing element 49 produces a. torque~
. N x N
of which value amounts to -3'~ , that is, approxima.tely
4.2 in the case of this embodiment times the torque of .
~05386Z : ~:
1 the reel shaft 15 of the cord reel 16, so that thetorque produced on the reel shaft 15 of the cord reel 16 may be approximately 1/4.2 times the torque on the ~ -shaft of the dust removing gear 39. Accordingly, the ~ .
coil spring 20 is required to p:roduce a toraue, sufficient to wind the cord 17, in addition to a torque amounting .
to approximately 1/4.2 times the torque produced on :
the shaft of the dust removing gear 39.
In contrast thereto, Figo 19 shows the prior 10 art cord reel assembly, wherein the rotation or turning .
force of the cord reel 160 is transmitted through a .
first gear 210 to a drive gear 220 and then to the .
ratchet type coupling 260. Then, the rotation i9 transmitted from the coupling 260 to the ratchet type 15 coupling 530 which is so designed as to rotate only ..
in one direction by means of a coupling spring 410, then . :
from the coupling 530 to a mount 550 mounting the dust removing element 490 thereon, for turning the mount 550.
In this case, assume Na as the number of teeth of the gear 210, and Nb as the number of teeth of the drive ; -.
gear 220, and the value of Na./Nb is larger than one.
Then, for rotating the dust removing element 490, a. ~
- tGrque required for the reel shaft of the cord reel 160 ~ ~;
should be Na/Nb times the torque required for rotating : . ..
25 the dust removing element 490. As a. result, the torque ~:
to be produced by the coil spring will be considera.ble. . .
Assume Tl as the torque required for winding the cord 17, and T2 as the torque required for rotating the dust removing element 49. Then 5 the torque To to be produced by means.of the coil spring 20 in this embodiment - 14 _ 1~538~iiZ -1 and a torque T to be produced by means of the prior art coil spring are given as follows:
To ~ Tl ~ (1/2 to 1/5) x T2 T = Tl ~ (one or more than one) x T2.
As can be seen from this, the torque T2 required for rotating the dust removing element 49 is considerably small as compared with the torque Tl required for winding the cord 17, in the case of this embodiment.
As a result, the embodiment shown permits the dust removing element 49 to be operated without the need of increasing a torque to be produced by the coil spring 20 either in the drawing out direction or in the winding direction of the cord 17.
As is apparent from the foregoing, the dust removing element 49 slidingly strikes the top edge portion 46c of the corrugations of the filter body 46 from the both directions,-as shown in Fig. 17, both upon winding and drawing out the cord 17, so that the top edge portions 46c of the corrugations of the filter body 46 will not be deformed. In this respect, according to the prior art dust removing element, the ridged portions 46c of the corruga-tions of the filter body 46 is hit by the dust removing element only in one direction, so that the repetition of such an operation leads to the deformation of the ridged portions 46c with the resulting failure of the dust removing element in stri~ing the ridged portions of the corrugations sufficiently. In - 15 - `~
,., ' ~,.
1~5386Z :
1 addition, according to this embodiment, a suction force whose level is lowered down to a point X after the cleaning operation as shown in Fig. 20 may be recovered to a point Y according to the winding operation of the
~05386Z : ~:
1 the reel shaft 15 of the cord reel 16, so that thetorque produced on the reel shaft 15 of the cord reel 16 may be approximately 1/4.2 times the torque on the ~ -shaft of the dust removing gear 39. Accordingly, the ~ .
coil spring 20 is required to p:roduce a toraue, sufficient to wind the cord 17, in addition to a torque amounting .
to approximately 1/4.2 times the torque produced on :
the shaft of the dust removing gear 39.
In contrast thereto, Figo 19 shows the prior 10 art cord reel assembly, wherein the rotation or turning .
force of the cord reel 160 is transmitted through a .
first gear 210 to a drive gear 220 and then to the .
ratchet type coupling 260. Then, the rotation i9 transmitted from the coupling 260 to the ratchet type 15 coupling 530 which is so designed as to rotate only ..
in one direction by means of a coupling spring 410, then . :
from the coupling 530 to a mount 550 mounting the dust removing element 490 thereon, for turning the mount 550.
In this case, assume Na as the number of teeth of the gear 210, and Nb as the number of teeth of the drive ; -.
gear 220, and the value of Na./Nb is larger than one.
Then, for rotating the dust removing element 490, a. ~
- tGrque required for the reel shaft of the cord reel 160 ~ ~;
should be Na/Nb times the torque required for rotating : . ..
25 the dust removing element 490. As a. result, the torque ~:
to be produced by the coil spring will be considera.ble. . .
Assume Tl as the torque required for winding the cord 17, and T2 as the torque required for rotating the dust removing element 49. Then 5 the torque To to be produced by means.of the coil spring 20 in this embodiment - 14 _ 1~538~iiZ -1 and a torque T to be produced by means of the prior art coil spring are given as follows:
To ~ Tl ~ (1/2 to 1/5) x T2 T = Tl ~ (one or more than one) x T2.
As can be seen from this, the torque T2 required for rotating the dust removing element 49 is considerably small as compared with the torque Tl required for winding the cord 17, in the case of this embodiment.
As a result, the embodiment shown permits the dust removing element 49 to be operated without the need of increasing a torque to be produced by the coil spring 20 either in the drawing out direction or in the winding direction of the cord 17.
As is apparent from the foregoing, the dust removing element 49 slidingly strikes the top edge portion 46c of the corrugations of the filter body 46 from the both directions,-as shown in Fig. 17, both upon winding and drawing out the cord 17, so that the top edge portions 46c of the corrugations of the filter body 46 will not be deformed. In this respect, according to the prior art dust removing element, the ridged portions 46c of the corruga-tions of the filter body 46 is hit by the dust removing element only in one direction, so that the repetition of such an operation leads to the deformation of the ridged portions 46c with the resulting failure of the dust removing element in stri~ing the ridged portions of the corrugations sufficiently. In - 15 - `~
,., ' ~,.
1~5386Z :
1 addition, according to this embodiment, a suction force whose level is lowered down to a point X after the cleaning operation as shown in Fig. 20 may be recovered to a point Y according to the winding operation of the
5 cord 17, and then further recovered to a point Z according `- `
to the drawing out operation of the cord 17 at the sta.rt of the cleaning operation. As a result, the cleaning operation ma.y be started under a. strong suction force. ~
In addition, if the cord 17 is wound after the completion of the cleaning operation, then the dust clinging to the filter 46 may be automatically removed, ~ n thus presenting convenience for the cleaning operation. :
I~ the normal operation, the dust removing operation is carried out automa.tically by winding and ~
15 drawing out the cord 17 in the normal cleaning opera.tion, `: . .
presenting a characteristic as shown by a curve l Ut in ~. :
Fig. 21. A curve 'W' in Fig. 21 represents the ~ -characteristic in the case of the dust removing opera~
tion which is carried out only manually. The comparison ...
of the curve 'U' with the curve 'W' reveals that the 'U
curve allows the collection of dust of a much more amount as compared with the curve 'W'. In other words, the curve 'U' allows the cleaning under a strong suction force, in terms of the same amount of dust being collected. However, in case the filter body 46 is clogged~ then a suction force may be recovered only up to the point X in Fig. 21, in the case of the dust removing operation utilizing the turning force of the cord reel .6.
In such a. case, the movable locking po~tion 42 1053136;~ `
1 is unlocked, so that the dust Gase 35 may removed from the main body case 1. As a result~ the dust removing assembly 47 may be separated from the transmission assembly 21 along the line Ql ~ Ql' in Fig. 16, i.e.
into the side of the main body case 1 and the side of the dust case 35, so that the dust removing knob 56 becomes exposed. Then, the dust removing knob 56 is rotated, so that the dust removing element 49 may hit the top edge portions 46c of the corrugations of the filter body 46. In this manner, the suction force or quantity of air can be recovered to the point X3 in Fig. 21.
In this embodiment, when the dust removing ;
knob 56 is rotated, the transmission gear 51 and the driven coupling 53 remain idling, so that the dust removing element 49 may be rotated with ease.
In case the striking portion 49a and the dust removing body portion 49b are placed in parallel with the surface of the filter 46, then the distance from the filter ~6 to the dust removing body portion 49b is shortened by the width of the striking portion 49a, as compared with the prior art arrangement, wherein the striking portion 49a is positioned between the filter 46 and the dust removing body portion 49b. In other words, the dust removing assembly 47 7 electric blower 10 and cord reel 16 may be placed closer to each other by the width of the striking portion 49a. As a result, the cleaner case consisting of the main body case 1 and the dust case 35 may be rendered smaller in size than that of the conventional cleaner caseO Particularly in :~ .
, - : ~ . - . . . . .. :. . . .. ... . .. .. ..
10531362 :
1 case the dust rernoving element 49 is ma.de of a wire a.s in this embodiment, the width of the striking portion 49a of a bent wire will be only the distance from the filter 46 to the dust removing body portion 49b, so 5 that the size of the cleaner case ma.y be rendered smaller -in size. In addition, the dust removing element 49 -is formed by simply bending a wire, so that the manufac- .
turing steps are much simplified. Since the protective material covers the end portion of the dust removing .
lO element 49, the damage and wear in the filter body 46 :
may be prevented.
As shown in Fig. 23, if the filter is bent into a corrugated shape having sharp corners as in the filter 460, the relatively small-sized dust or sand .
would be caught in the groove portions of the corruga-tions. In contrast thereto~ as shown in Figs. 22 and - 24~ the filter body 46 shown has spacers 71 in the groove portions of the corrugations, so that there is no risk of dust 99 being caught in the groove portions of the corrugations, but the dust tends to cling to the side surface of the groove portions or drops in the fine-dust chamber 38 in the dust case 35. :
In addition, if the dust removing element 49slidingly hits or rubs the back surface of the filter body 46 free of the spacers 71, then there arises a possibility of cracking or tear in the top edge portions ~
of the corruga.tions on the back surfa.ces of the filter -body 460. In contrast thereto, a.s shown Figs. 22 and 24, with the filter body 46 having spacers 71, if the filter surface causes wear of a depth of X4 as shown .~
' ~' .
.~ - - - - . . , . , . ~ . , :
.- . :, . , . . : . . , 1~5;~36Z
1 in Fig. 24, then there results only exposed spacers 71 presenting no possibility of causing cracking holes or tear in the surface of the filter body ~6. In addition, the spacers 71 protect the corrugated filter 46a ~rom wear and damage due to the rubbing motions of the dust removing element 49, while the reinforcing member 46b protects the corrugated filter 46a from damage due to inadvertent external force of the user. In other words, in the case of the prior art arrangement as shown in Fig. 25, if an external force P3 is exerted on the top edge portions of the corrugations of the filter 460, then there is created an abnorma1 stress in the joint portion between the corrugated filter 461 and the holding frame 462~ thus leading to cracking 463 in the filter 461 made of paper and having a low mechanical strength.
In contrast thereto, in the case of this embodiment as sho~ in Fig. 15, even if an external force P4 is applied to the filter, the reinforcing member 46b is deformed elastically, thereby preventing the creation of the abnormal stress in the joint portion between the corrugated filter medium 46a and the frame body 46b, with the resulting prevention of the filter 46 from damage.
On the other hand, if the filter body 46 is exposed to moisture, the filter body causes linear expansion, so that the corrugated filter 46a is bent or wrinkled, failing to achieve the intended dust remov-- ing effect. In this embodiment, however, the spacers 71 and reinforcing members 46b absorb the moisture and thus cause the linear expansion, thereby preventing the waving phenomenon or wrinkles of the corrugated filter.
- 19 ~
1~)53862 ~
1 As shown in Fig. 14~ the spacers 71 and reinforcing members 46d are placed on the same side of .
the filter 46, so tha.t the reinforcing members L~6a and frame body 46b may be molded integra.lly by using a .
5 plastic material. In such a ca.se, a.s shown, a gate .
100, through which the plastic material is injected, may be placed only in a cavity for the reinforcing member 46d, thus allowing the molding of the both ^;
spacers 71 and the reinforcing members 46d. This avoids the provision of the gate 100 as well as a gate to be positioned in the cavities for the groove portions, in .
the casting mold. As a resul-t, productivity can be much improved, without the need of providing such excessive gates 100.
Still furthermore~ as shown in Fig. 4, the .
cord reel 16 and the transmission components associated therewith are placed as one block, or a sub-assembly, so that these components may be built in the main body i~
case 1 with ease, but without a risk of the transmission components being out of engagement.
Meanwhile, with this embodiment, the dust case .-35 is installed in the case 1, and then the stationary :
- locking portion 95 is fitted, after which the movable locking portion 43 is engaged. In this case, however, 25 the coupling portion is pla.ced close to the stationary `-locking portion 95, so that there is no possibility of the coupling portion being da.ma.ged, due to their low .. : .
impinging speed. Still furthermore, this fa.cilita.tes ~:.
the alignment of the both axes of rotations a.t the time `.
of engagement of.coupling~ thus minimizing the loss , ~ - 20 -~053862 1 in torque in the coupling porti.on, with the accompan~ing positive transmission of torqueO . ..
As is apparent from the foregoing description, -the vacuum cleaner a.ccording to the present invention 5 permits smooth dust removing operations both upon .
drawing out and winding the cord from and around the cord reél.
to the drawing out operation of the cord 17 at the sta.rt of the cleaning operation. As a result, the cleaning operation ma.y be started under a. strong suction force. ~
In addition, if the cord 17 is wound after the completion of the cleaning operation, then the dust clinging to the filter 46 may be automatically removed, ~ n thus presenting convenience for the cleaning operation. :
I~ the normal operation, the dust removing operation is carried out automa.tically by winding and ~
15 drawing out the cord 17 in the normal cleaning opera.tion, `: . .
presenting a characteristic as shown by a curve l Ut in ~. :
Fig. 21. A curve 'W' in Fig. 21 represents the ~ -characteristic in the case of the dust removing opera~
tion which is carried out only manually. The comparison ...
of the curve 'U' with the curve 'W' reveals that the 'U
curve allows the collection of dust of a much more amount as compared with the curve 'W'. In other words, the curve 'U' allows the cleaning under a strong suction force, in terms of the same amount of dust being collected. However, in case the filter body 46 is clogged~ then a suction force may be recovered only up to the point X in Fig. 21, in the case of the dust removing operation utilizing the turning force of the cord reel .6.
In such a. case, the movable locking po~tion 42 1053136;~ `
1 is unlocked, so that the dust Gase 35 may removed from the main body case 1. As a result~ the dust removing assembly 47 may be separated from the transmission assembly 21 along the line Ql ~ Ql' in Fig. 16, i.e.
into the side of the main body case 1 and the side of the dust case 35, so that the dust removing knob 56 becomes exposed. Then, the dust removing knob 56 is rotated, so that the dust removing element 49 may hit the top edge portions 46c of the corrugations of the filter body 46. In this manner, the suction force or quantity of air can be recovered to the point X3 in Fig. 21.
In this embodiment, when the dust removing ;
knob 56 is rotated, the transmission gear 51 and the driven coupling 53 remain idling, so that the dust removing element 49 may be rotated with ease.
In case the striking portion 49a and the dust removing body portion 49b are placed in parallel with the surface of the filter 46, then the distance from the filter ~6 to the dust removing body portion 49b is shortened by the width of the striking portion 49a, as compared with the prior art arrangement, wherein the striking portion 49a is positioned between the filter 46 and the dust removing body portion 49b. In other words, the dust removing assembly 47 7 electric blower 10 and cord reel 16 may be placed closer to each other by the width of the striking portion 49a. As a result, the cleaner case consisting of the main body case 1 and the dust case 35 may be rendered smaller in size than that of the conventional cleaner caseO Particularly in :~ .
, - : ~ . - . . . . .. :. . . .. ... . .. .. ..
10531362 :
1 case the dust rernoving element 49 is ma.de of a wire a.s in this embodiment, the width of the striking portion 49a of a bent wire will be only the distance from the filter 46 to the dust removing body portion 49b, so 5 that the size of the cleaner case ma.y be rendered smaller -in size. In addition, the dust removing element 49 -is formed by simply bending a wire, so that the manufac- .
turing steps are much simplified. Since the protective material covers the end portion of the dust removing .
lO element 49, the damage and wear in the filter body 46 :
may be prevented.
As shown in Fig. 23, if the filter is bent into a corrugated shape having sharp corners as in the filter 460, the relatively small-sized dust or sand .
would be caught in the groove portions of the corruga-tions. In contrast thereto~ as shown in Figs. 22 and - 24~ the filter body 46 shown has spacers 71 in the groove portions of the corrugations, so that there is no risk of dust 99 being caught in the groove portions of the corrugations, but the dust tends to cling to the side surface of the groove portions or drops in the fine-dust chamber 38 in the dust case 35. :
In addition, if the dust removing element 49slidingly hits or rubs the back surface of the filter body 46 free of the spacers 71, then there arises a possibility of cracking or tear in the top edge portions ~
of the corruga.tions on the back surfa.ces of the filter -body 460. In contrast thereto, a.s shown Figs. 22 and 24, with the filter body 46 having spacers 71, if the filter surface causes wear of a depth of X4 as shown .~
' ~' .
.~ - - - - . . , . , . ~ . , :
.- . :, . , . . : . . , 1~5;~36Z
1 in Fig. 24, then there results only exposed spacers 71 presenting no possibility of causing cracking holes or tear in the surface of the filter body ~6. In addition, the spacers 71 protect the corrugated filter 46a ~rom wear and damage due to the rubbing motions of the dust removing element 49, while the reinforcing member 46b protects the corrugated filter 46a from damage due to inadvertent external force of the user. In other words, in the case of the prior art arrangement as shown in Fig. 25, if an external force P3 is exerted on the top edge portions of the corrugations of the filter 460, then there is created an abnorma1 stress in the joint portion between the corrugated filter 461 and the holding frame 462~ thus leading to cracking 463 in the filter 461 made of paper and having a low mechanical strength.
In contrast thereto, in the case of this embodiment as sho~ in Fig. 15, even if an external force P4 is applied to the filter, the reinforcing member 46b is deformed elastically, thereby preventing the creation of the abnormal stress in the joint portion between the corrugated filter medium 46a and the frame body 46b, with the resulting prevention of the filter 46 from damage.
On the other hand, if the filter body 46 is exposed to moisture, the filter body causes linear expansion, so that the corrugated filter 46a is bent or wrinkled, failing to achieve the intended dust remov-- ing effect. In this embodiment, however, the spacers 71 and reinforcing members 46b absorb the moisture and thus cause the linear expansion, thereby preventing the waving phenomenon or wrinkles of the corrugated filter.
- 19 ~
1~)53862 ~
1 As shown in Fig. 14~ the spacers 71 and reinforcing members 46d are placed on the same side of .
the filter 46, so tha.t the reinforcing members L~6a and frame body 46b may be molded integra.lly by using a .
5 plastic material. In such a ca.se, a.s shown, a gate .
100, through which the plastic material is injected, may be placed only in a cavity for the reinforcing member 46d, thus allowing the molding of the both ^;
spacers 71 and the reinforcing members 46d. This avoids the provision of the gate 100 as well as a gate to be positioned in the cavities for the groove portions, in .
the casting mold. As a resul-t, productivity can be much improved, without the need of providing such excessive gates 100.
Still furthermore~ as shown in Fig. 4, the .
cord reel 16 and the transmission components associated therewith are placed as one block, or a sub-assembly, so that these components may be built in the main body i~
case 1 with ease, but without a risk of the transmission components being out of engagement.
Meanwhile, with this embodiment, the dust case .-35 is installed in the case 1, and then the stationary :
- locking portion 95 is fitted, after which the movable locking portion 43 is engaged. In this case, however, 25 the coupling portion is pla.ced close to the stationary `-locking portion 95, so that there is no possibility of the coupling portion being da.ma.ged, due to their low .. : .
impinging speed. Still furthermore, this fa.cilita.tes ~:.
the alignment of the both axes of rotations a.t the time `.
of engagement of.coupling~ thus minimizing the loss , ~ - 20 -~053862 1 in torque in the coupling porti.on, with the accompan~ing positive transmission of torqueO . ..
As is apparent from the foregoing description, -the vacuum cleaner a.ccording to the present invention 5 permits smooth dust removing operations both upon .
drawing out and winding the cord from and around the cord reél.
Claims (15)
1. A vacuum cleaner comprising a dust case having an air-intake opening;
a main body case having an air exhaust opening;
means for releasably locking said dust case and said main body case;
a filter body having a fine mesh and received within said dust case;
an electric blower received within the main body case and adapted to introduce an air flow into said air exhaust opening, which air flow has been relieved of dust introduced from the air-intake opening by the action of the filter body and has passed therethrough;
a cord reel received within said main body case and adapted to be automatically wound by means of a coil spring;
a dust removing means for removing the dust clinging to said filter body; and a transmission means for driving said dust removing means due to the utilization of the turning force of said cord reel produced upon winding and drawing out said cora;
said dust removing means having a dust removing element which rotatively slides on the back surface of said filter body to remove the dust clinging to said filter body therefrom with the rotational speed of said dust removing element being smaller than that of said cord reel.
a main body case having an air exhaust opening;
means for releasably locking said dust case and said main body case;
a filter body having a fine mesh and received within said dust case;
an electric blower received within the main body case and adapted to introduce an air flow into said air exhaust opening, which air flow has been relieved of dust introduced from the air-intake opening by the action of the filter body and has passed therethrough;
a cord reel received within said main body case and adapted to be automatically wound by means of a coil spring;
a dust removing means for removing the dust clinging to said filter body; and a transmission means for driving said dust removing means due to the utilization of the turning force of said cord reel produced upon winding and drawing out said cora;
said dust removing means having a dust removing element which rotatively slides on the back surface of said filter body to remove the dust clinging to said filter body therefrom with the rotational speed of said dust removing element being smaller than that of said cord reel.
2. A vacuum cleaner as set forth in Claim 1, further comprising means for manually actuating said dust removing means without the utilization of the turning force of said cord reel.
3. A vacuum cleaner as set forth in Claim 1, wherein said dust removing element consists of a striking portion for striking ridged portions of a corrugated filter medium constituting said filter body, and a dust removing body portion for supporting said striking portion, and said striking portion and said dust removing body portion being juxtaposed on the back surface of said filter body.
4. A vacuum cleaner as set forth in Claim 3, wherein said striking portion comprises a bent end of a wire, and the remaining part of said wire constitutes said dust removing body portion.
5. A vacuum cleaner as set forth in Claim 4, wherein said striking portion is provided with a protective member.
6. A vacuum cleaner as set forth in Claim 1, wherein said filter body comprises a corrugated filter medium and a frame member for supporting said corrugated filter medium.
7. A vacuum cleaner as set forth in Claim 6, wherein there is provided a spacer member in the groove portions of corrugations on the side surface of said corrugated filter medium opposite to a side surface where the ridged portions of the corrugations are struck by said dust removing element of said dust removing means.
8. A vacuum cleaner as set forth in Claim 7, wherein there is provided a reinforcing member on the ridged portions of the corrugations on the side surface of said corrugated filter medium opposite to a side surface where the ridged portions of the corrugations are struck by said dust removing element of said dust removing means, and wherein said reinforcing member is formed integrally with said frame member.
9. A vacuum cleaner as set forth in Claim 1, further comprising drive and driven couplings which cooperatively transmit the turning force of the cord reel from said transmission means to said dust removing means only when said dust case is locked with said main body case.
10. A vacuum cleaner as set forth in Claim 9, wherein said driven coupling is mounted on the dust removing means, and said drive coupling is mounted on the transmission means, and wherein said driven coupling is elastically supported.
11. A vacuum cleaner as set forth in Claim 1, wherein said transmission means comprises a gear provided on the side wall of said cord reel; a drive gear for meshing with said gear; a face gear for meshing with said drive gear in such a manner as to change the axial direction of rotation through an angle of 90°; and a drive coupling integrally formed on the rotary shaft of said face gear; and wherein said dust removing means comprises a dust removing element for slidingly striking the back surface of said filter body; a dust removing gear mounting said dust removing element thereon; a transmission gear for meshing with said dust removing gear; and a driven coupling mounted on the shaft of said transmission gear.
12. A vacuum cleaner as set forth in Claim 9, wherein there are a first packing for sealing between said filter body and dust case, and a packing formed integrally with said first packing for sealing between said driven and drive couplings.
13. A vacuum cleaner as set forth in Claim 11, wherein the respective components constituting said transmission means are all mounted on a support plate for supporting said cord reel mounted within said main body case.
14. A vacuum cleaner as set forth in Claim 9, further comprising a stationary locking section for locking said dust case to said main body case, and said drive and driven couplings being positioned on the side of said stationary locking section.
15. A vacuum cleaner as set forth in Claim 11, further comprising a braking ring for braking said cord reel against the winding force of said cord reel, and said braking ring and said gears being provided on the same side of one of side walls of said cord reel.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP685675A JPS5181463A (en) | 1975-01-14 | 1975-01-14 | DENKISOJIKI |
| JP685575A JPS5182966A (en) | 1975-01-14 | 1975-01-14 | DENKISOJIKI |
| JP685475A JPS5181464A (en) | 1975-01-14 | 1975-01-14 | DENKISOJIKI |
| JP6431475U JPS51144968U (en) | 1975-05-16 | 1975-05-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1053862A true CA1053862A (en) | 1979-05-08 |
Family
ID=45725577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA243,342A Expired CA1053862A (en) | 1975-01-14 | 1976-01-12 | Vacuum cleaner having automatic filter cleaner |
Country Status (7)
| Country | Link |
|---|---|
| AU (1) | AU476348B2 (en) |
| CA (1) | CA1053862A (en) |
| CH (1) | CH603133A5 (en) |
| DE (1) | DE2601037C3 (en) |
| FR (1) | FR2297596A1 (en) |
| GB (1) | GB1504063A (en) |
| SE (1) | SE7600281L (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4258451A (en) * | 1979-07-23 | 1981-03-31 | Tennant Company | Surface sweeping machine |
| EP0024636B2 (en) * | 1979-08-16 | 1989-10-18 | Hitachi, Ltd. | Vacuum cleaner |
| US6219880B1 (en) | 1998-09-17 | 2001-04-24 | Pullman-Holt Corporation | Vacuum cleaner |
| AU2003231582B2 (en) * | 1999-07-17 | 2005-10-20 | Black & Decker Inc | Improvements in vacuum cleaners |
| GB9916759D0 (en) * | 1999-07-17 | 1999-09-15 | Black & Decker Inc | Improvements in vacuum cleaners |
| EP1188405A3 (en) | 2000-09-19 | 2003-01-29 | Lg Electronics Inc. | Vacuum cleaner with improved cooling |
| DE102004020555B4 (en) * | 2004-04-27 | 2006-09-21 | Fibermark Gessner Gmbh & Co. | Dust filter bag, containing foam layer |
| DE102015106289A1 (en) * | 2015-04-23 | 2016-10-27 | Miele & Cie. Kg | Vacuum cleaner and filter unit for use with a vacuum cleaner |
| CN112854676B (en) * | 2021-01-04 | 2022-09-27 | 陈雨玲 | Automatic chain winding and unwinding device for automatic plastering machine |
-
1976
- 1976-01-09 CH CH19976A patent/CH603133A5/xx not_active IP Right Cessation
- 1976-01-12 GB GB1044/76A patent/GB1504063A/en not_active Expired
- 1976-01-12 CA CA243,342A patent/CA1053862A/en not_active Expired
- 1976-01-13 AU AU10255/76A patent/AU476348B2/en not_active Expired
- 1976-01-13 DE DE2601037A patent/DE2601037C3/en not_active Expired
- 1976-01-13 SE SE7600281A patent/SE7600281L/en unknown
- 1976-01-14 FR FR7600838A patent/FR2297596A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| CH603133A5 (en) | 1978-08-15 |
| DE2601037C3 (en) | 1979-08-30 |
| DE2601037B2 (en) | 1979-01-04 |
| GB1504063A (en) | 1978-03-15 |
| DE2601037A1 (en) | 1976-07-15 |
| AU476348B2 (en) | 1976-09-16 |
| FR2297596B1 (en) | 1978-07-21 |
| SE7600281L (en) | 1976-07-15 |
| AU1025576A (en) | 1976-09-16 |
| FR2297596A1 (en) | 1976-08-13 |
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