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EP0430146B1 - Indicateur de remplissage du sac à poussière d'un aspirateur - Google Patents

Indicateur de remplissage du sac à poussière d'un aspirateur Download PDF

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Publication number
EP0430146B1
EP0430146B1 EP19900122569 EP90122569A EP0430146B1 EP 0430146 B1 EP0430146 B1 EP 0430146B1 EP 19900122569 EP19900122569 EP 19900122569 EP 90122569 A EP90122569 A EP 90122569A EP 0430146 B1 EP0430146 B1 EP 0430146B1
Authority
EP
European Patent Office
Prior art keywords
pointer
tube
valve
dust collection
dust
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 - Lifetime
Application number
EP19900122569
Other languages
German (de)
English (en)
Other versions
EP0430146A1 (fr
Inventor
Hidenori Kitamura
Motoi Miyoshi
Akihiro Hirano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP30701289A external-priority patent/JPH03165725A/ja
Priority claimed from JP2063188A external-priority patent/JPH0824644B2/ja
Priority claimed from JP14111290A external-priority patent/JPH0433629A/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0430146A1 publication Critical patent/EP0430146A1/fr
Application granted granted Critical
Publication of EP0430146B1 publication Critical patent/EP0430146B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/19—Means for monitoring filtering operation

Definitions

  • the present invention relates generally to vacuum cleaners, and more particularly to a dust collection indicator incorporated in a vacuum cleaner for indicating the quantity of dust collected in the vacuum cleaner.
  • the dust collection indicator 1 includes a first pointer 2 colored in green, for example, and a second pointer 3 colored in red, for example, and firmly fitted with the first pointer 2, a compression coil spring 4 urging the first and second pointers 2, 3 backward, a ring-shaped end cap 6 disposed behind the second pointer 3 and having a central hole 5, a transparent hollow cylindrical pointer tube 7 receiving therein the spring 4, the first and second pointers 2, 3 with its rear end partly closed by the end cap 6, and a connecting pipe 9 interconnecting the front end of the pointer tube 7 and a duct collecting chamber 8 in the body 10 of a vacuum cleaner.
  • the cleaner body 10 includes a front body portion 11 covering an upper part of the duct collecting chamber 8.
  • the front body portion 11 has a recessed upper portion 12 in which the duct collection indicator 1 is disposed with the connecting pipe 9 communicating with the dust collecting chamber 8.
  • a cover plate 13 attached to the front body portion 11 to close the recessed upper portion 12 has a window 14 through which either of the two pointers 2, 3 can be observed from the outside of the cleaner depending on the quantity of dust collected in a dust bag 15 disposed in the dust collecting chamber 8. In the initial condition, the green-colored first pointer 2 is observed.
  • the pressure in the dust collecting chamber 8 falls below a predetermined level whereupon the differential pressure acting on the second pointer 3 exceeds the force of the spring 4. Consequently, the first and second pointers 2, 3 are displaced toward the connecting pipe 9. Now, the red-colored second pointer 3 is observed through the window 14. With this change of color of the pointers 2, 3, the user can readily understand that the dust bag must be emptied.
  • the conventional indicator 1 With this construction, if the first and second pointers 2, 3 of the conventional indicator 1 are displaced toward the connecting pipe 9, the outside air flows through the window 14, through the central hole 5, through the pointer tube 7 and through the connecting pipe 9 into the dust collecting chamber 8, thereby lowering the suction power of the vacuum cleaner.
  • the pre-load on the first and second pointers 2, 3, i.e. the force of the spring 4 is set such that the forward displacement of the first and second pointers takes place when the dust bag substantially fills up with dust.
  • the conventional indicator 1, therefore, has a drawback that the amount of displacement of the first and second pointers 2, 3 is not proportional to the quantity of dust collected in the dust bag.
  • the pressure in the dust collecting chamber 8 is still above the predetermined level even when the dust bag is fully occupied and, therefore, displacement of the first and second pointers 2, 3 does not take place.
  • a continuous use of the vacuum cleaner causes the bursting or rupture of the dust bag which will result in a malfunction of a motor fan 16 due to the dust caught up into the motor fan 16.
  • the dust has accumulated inside a hose connected to the body 10 of the vacuum cleaner, making it difficult to exchange the dust bag 15.
  • the dust has spilled out from the dust bag 15 into the dust collecting chamber 8, requiring cleaning of the dust collecting chamber 8.
  • a known dust collection indicator is shown in the DE-A-26 38 672.
  • This indicator comprises a hat-shaped piston, to the brim of which the inner rim of an annular, stepped diaphragm is fastened. The outer rim of the diaphragm is clamped between a cover cap and the housing.
  • a more specific object of the present invention is to provide a dust collection indicator which is capable of indicating the dust collecting capacity substantially in proportion to the quantity of dust being collected in the dust bag in a vacuum cleaner.
  • a dust collection indicator of this invention includes a valve for separating the atmospheric pressure and a vacuum pressure which is developed while a motor fan of the vacuum cleaner is driven.
  • the valve is deformable by a differential pressure created between the vacuum pressure and the atmospheric pressure so as to displace at least one pointer in a direction away from the atmospheric pressure side without causing leakage of air during displacement of the pointer, thus preventing undue reduction of the suction force.
  • the pressure at which the valve starts deforming can be set to a level closer to the atmospheric pressure than the level obtained by the conventional indicator, so that the pointer is displaced substantially in proportion to the quantity of dust being collected in a dust bag. This arrangement enables the user to recognize the current quantity of dust accumulated in the vacuum cleaner at all times.
  • the valve is disposed on the atmospheric pressure side relative to the pointer and gripped between a pointer tube and a tubular end cap. This construction is advantageous in that the vacuum pressure and the atmospheric pressure are isolated reliably, the valve is protected against damage, and the indicator can be assembled with utmost ease.
  • a dust collection indicator for a vacuum cleaner including a motor fan drivable to develop a vacuum pressure, which comprises a substantially transparent pointer tube receptive of the vacuum pressure; a substantially hat-shaped valve disposed in the pointer tube for separating the vacuum pressure and the atmospheric pressure, the valve being deformable by a differential pressure created between the vacuum pressure and the atmospheric pressure, wherein the pointer tube includes a projection fitted with the central projection of the hat-shaped valve; at least one pointer slidably disposed in the pointer tube and displaceable by the deformation of the valve; and a spring disposed in the pointer tube for urging the pointer toward a atmospheric pressure side to prevent the pointer from displacing until the vacuum pressure reaches to a predetermined level.
  • FIG. 4 shows a vacuum cleaner incorporating a dust collection indicator according to this invention.
  • the vacuum cleaner includes a body 21 having a dust bag 22 received in a dust collecting chamber 23 for precipitating and collecting dust and dirt which are sucked from the carpet or floor through a cleaning attachment assembly composed of a suction nozzle, extension wands and a hose (neither shown).
  • a motor fan 24 and a cord winding device (not shown) are disposed in the cleaner body 21 behind the dust collecting chamber 23.
  • the cleaner body 21 includes an upper cover or lid 25 extending above the dust collecting chamber 23 for opening and closing the same.
  • the upper lid 25 has a rear end fitted in an upper portion 26 of the cleaner body 21, the front end of the upper lid 25 being locked on the cleaner body 21 by the action of a latch 27.
  • the upper lid 25 has an outwardly facing central recess 28 in which the dust collection indicator 29 is disposed.
  • the dust collection indicator 29 includes a transparent hollow cylindrical pointer tube 30, a first pointer 31 colored in green and a second pointer 32 colored in red which are slidably disposed in the pointer tube 30 and displaceable in unison with each other, a connecting pipe 33 interconnecting the dust collecting chamber 23 and the inside of the pointer tube 30, a compression coil spring 34 disposed between the connecting pipe 33 and the first pointer 31 for urging the first and second pointers 31, 32 away from the connecting pipe 33, a tubular end cap 35 fitted in an end of the pointer tube 30 remote from the connecting pipe 33, and a substantially hat-shaped pointer valve 36 gripped at its outer periphery by and between the pointer tube 30 and the end cap 35 for fluid-tightly separating the second pointer side and the end cap side, the pointer valve 36 being formed of a flexible material such as rubber.
  • the pointer tube 30 has a double-tube structure including an inner tube 37 integral with the rear end of the pointer tube 30 adjacent to the end cap 35 and extending therefrom toward the connecting pipe 33 for engagement with the second pointer 32 to set the initial position of the second pointer 32.
  • the first pointer 31 and the second pointer 32 are fitted together through the form-locking engagement.
  • the second pointer 32 has a double-tube structure including an outer tube 38 and an inner hub or projection 39 integral with an end of the outer tube 38 adjacent to the first pointer 31 and extending therefrom toward the end cap 35.
  • the tubular projection 39 projects into the tubular end cap 35 and is snugly fitted in a thin central projection or crown 40 of the hat-shaped pointer valve 36.
  • the tubular end cap 35 retaining the periphery of the pointer valve 36 is centrally opened so that the cleaner body 21 (Fig. 4) communicates with the atmosphere through the tubular end cap 35.
  • the connecting pipe 33 has a front end fitted in an opening 41 formed in the bottom of the recess 28 so that the connecting pipe 33 communicates with the dust collecting chamber 23.
  • the pointer valve 36 serves to displace the first and second pointers 31, 32 toward the connecting pipe 33 depending on a differential force created between the force of the spring 34 and a suction force which acts inside the inner tube 37 in a direction toward the dust collecting chamber 23 based on a differential pressure between the atmospheric pressure and the vacuum pressure.
  • a cover plate 42 (Fig. 4) is fitted in the recess 28 and has a window 43 disposed above the pointer tube 30. When the motor fan 24 is in the inoperative condition, the green-colored first pointer 31 is observed through the window 43.
  • the dust collection indicator 29 of the foregoing construction operates as follows. While the vacuum cleaner is operating, dust and grit particles are collected in the dust bag 22. As the dust accumulates in the dust bag 22, the flow rate of air drawn by the motor fan 24 reduces and hence the vacuum pressure or suction developed by the motor fan 24 within the dust collecting chamber gradually goes down to a level below the atmospheric pressure. As the quantity of dust collected in the dust bag further increases, the vacuum pressure in the dust collecting chamber 23 falls below a predetermined level whereupon, owing to a differential pressure acting inside the inner tube 37, a suction force tending to pull the central projection 40 of the pointer valve 36 toward the connecting pipe 33 exceeds the force of the spring 34.
  • an outer peripheral edge portion of the central projection 40 is inwardly flexed or otherwise bent into a U shape so that the distal end of the central projection 40 is slightly displaced toward the connecting pipe 33, thereby moving the first and second pointers 31, 32 toward the connecting pipe 33 correspondingly.
  • the pointer valve 36 is gripped between the pointer tube 30 and the end cap 35 to completely isolate a vacuum pressure portion disposed on the second pointer side and an atmospheric pressure portion disposed on the end cap side, the outside air is completely prevented from flowing into the dust collecting chamber 23 even when the central projection 40 of the pointer valve 36 and the first and second pointers 31, 32 are displaced. Thus, a wasteful reduction of the suction force can be avoided.
  • the pre-loading force of the spring 34 acting on the first and second pointers 31, 32 can be reduced so that the central projection 40 of the pointer valve 36 starts flexing into a U shape even when the vacuum pressure in the dust collecting chamber 23 is still low, i.e. when the quantity of dust collected in the dust bag 22 is still small.
  • the first and second pointers 31, 32 are displaced progressively within the range of the window 43 substantially in direct proportion to a reduction of the pressure in the dust collecting chamber 23 which corresponds to an increase in the quantity of dust collected in the dust bag 22. This enables the user to recognize the current dust level or quantity with accuracy.
  • the pointer valve 36 With the provision of the pointer valve 36, there is no stream of air created in within pointer tube 30. Consequently, the pointer tube 30 is free from adhesion of the dust which would otherwise hinder smooth movement of the first and second pointers 31, 32, stain the pointer tube 30 to thereby make it difficult to identify the pointers 31, 32, and damage the pointer valve 36. Since the displacement of the first and second pointers 31, 32 is determined by a static differential pressure acting on the central projection 40 of the pointer valve 36, the pre-loading force of the spring 34 and, more particularly, the force of the spring 34 at the maximum displacement of the pointers 31, 32 can easily be set.
  • the pointer valve 36 disposed to the atmospheric pressure side relative to the second pointer 32 ensures that the central projection 40 including the U-shaped flexed portion closely fitted with the inner projection 39 of the second pointer 32 and the inner tube 37 of the pointer tube 30 while the motor fan 24 is operating.
  • most of the suction force resulting from the differential pressure and acting on the pointer valve 36 to pull or draw the central portion 40 toward the connecting pipe 33 is retained jointly by an outer peripheral surface of the inner projection 39 and an inner peripheral surface of the inner tube 37.
  • the bent or flexed portion of the central projection 40 is subjected to only a small suction force.
  • the central projection 40 deforms smoothly without involving relative sliding motion between itself and either of the inner projection 39 and the inner tube 37.
  • the pointer valve 40 is, therefore, durable in construction and reliable in operation.
  • the first pointer 31 and the second pointer 32 are urged against each other by the spring 34 and the pointer valve 36 and hence they are slidably movable within the pointer tube 30 as a single unit even when the first and second pointers 31, 32 are firmly fitted together through a form-locking engagement.
  • the first and second pointers 31, 32 need to be merely placed in the pointer tube 30 without joining them together. This facilitates the assembling operation of the dust collection indicator 29.
  • the atmospheric pressure side and the vacuum pressure side are separated easily by simply gripping the pointer valve 36 between the pointer tube 30 and the end cap 35. Furthermore, since the movement of the second pointer 32 in a direction toward the atmospheric pressure side is limited by the inner tube 37, the central projection 40 of the pointer valve 36 is protected from being tensioned by the inner projection 39 of the second pointer 32 while the motor fan 24 is stopped, i.e. when the vacuum cleaner is not used. Thus, the durability of the central projection 40 of the pointer valve 36 is not deteriorated.
  • Fig. 6 shows a second embodiment of this invention which aims mainly at the provision of a low-cost dust collection indicator.
  • the dust collection indicator 29a differs from the indicator 29 of the first embodiment shown in Figs. 3 - 5 in that a pointer valve 36 including a thin central projection 40 is integral with a tubular end cap 35 of an elastic material such as rubber.
  • the number of components of the indicator 29a is smaller by one than that of the indicator 20 of the first embodiment and hence the indicator 29a can be assembled easier at a lower cost than the indicator 29.
  • the elastic end cap 35 firmly fitted in the pointer tube 30 provides a hermetic seal between them.
  • the air-tight structure can be provided easily as compared to the indicator 29 in which a separate pointer valve 36 is used.
  • Figs. 7 and 8 show a modified form of the dust collection indicator according to this invention.
  • the modified indicator 29b includes a single pointer 50 having a green-colored, hollow-cylindrical pointer body 50a and a cup-shaped projection 51 extending coaxially from a rear end of the pointer body 50a and fitted with the central projection 40 of a pointer valve 36.
  • the projection 51 is colored in red and hence serves as a second pointer.
  • a compression coil spring 34 disposed between a connecting pipe 33 and the pointer 50 urges the pointer 50 toward the pointer valve 36 until the pointer 50 abuts against a stepped portion 52 of a pointer tube 30.
  • the green-colored pointer body 50a is disposed directly below the window 43.
  • the dust collection indicators of this invention are reliable in operation and capable of indicating the dust collecting capacity substantially in proportion to the quantity of dust being collected in the dust bag.
  • a dust collection indicator (29) for a vacuum cleaner includes a valve (36) for separating the atmospheric pressure and a vacuum pressure which is developed while a motor fan (24) of the vacuum cleaner is driven.
  • the valve is (29) deformable by a differential pressure created between the vacuum pressure and the atmospheric pressure so as to displace first and second pointers (31, 32) in a direction away from the atmospheric pressure side without causing leakage of air during displacement of the pointers (31, 32), thus preventing undue reduction of the suction force.
  • the pressure at which the valve (36) starts deforming can be set to a level closer to the atmospheric pressure than the level as obtained by the conventional indicator, so that the pointers (31, 32) are displaced substantially in proportion to the quantity of dust being collected in a dust bag (22). This arrangement enables the user to recognize the current quantity of dust accumulated in the vacuum cleaner at all times.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)

Claims (8)

  1. Indicateur (29; 29a; 29b) de quantité de poussière recueillie dans un aspirateur à poussière comprenant un ventilateur (24) à moteur, pouvant être entraîné de manière à créer une pression négative, ledit indicateur comprenant un tube indicateur transparent (30; 52) récepteur de pression négative, au moins un élément d'indication (31, 32; 50) disposé de façon coulissante dans ledit tube indicateur (30; 52), et un ressort (34) disposé dans ledit tube indicateur (30; 52) pour pousser ledit élément d'indication (31, 32; 50) en direction du côté pression atmosphérique afin d'empêcher ledit élément d'indication (31, 32; 50) de se déplacer jusqu'à ce que la pression négative atteigne un niveau prédéterminé,
       caractérisé par le fait:
       qu'une valve (36) est disposée dans ledit tube indicateur (30; 52) pour séparer la pression négative et la pression atmosphérique, ladite valve (36) pouvant être déformée par une pression différentielle créée entre la pression négative et la pression atmosphérique, ledit élément d'indication (31, 32; 50) pouvant être déplacé par la déformation de ladite valve (36), et que ladite valve (36) a sensiblement une forme en chapeau et comprend une mince saillie centrale (40) se trouvant sur le côté pression atmosphérique par rapport audit élément d'indication (31, 32; 50), ledit élément d'indication (31, 32; 50) comprenant une saillie (39; 51) engagée dans la saillie centrale (40) de ladite valve (36) en forme de chapeau.
  2. Indicateur de quantité de poussière recueillie selon la revendication 1, dans lequel ledit élément d'indication (31; 32) comprend un premier élément d'indication coloré (31) sur lequel agit ledit ressort (34), et un second élément d'indication (32) comprenant ladite saillie (39) et ayant une couleur différente de la couleur dudit premier élément d'indication (31), ledit élément d'indication (32) étant disposé entre ledit premier élément d'indication (31) et ladite valve (36).
  3. Indicateur de quantité de poussière recueillie selon la revendication 1, dans lequel ledit élément d'indication (50) comprend un corps coloré (50a) sur lequel agit ledit ressort (34), ladite saillie (51) faisant partie intégrante dudit corps (50a) d'élément d'indication et ayant une couleur différente de la couleur dudit corps (50a) d'élément d'indication.
  4. Indicateur de quantité de poussière recueillie selon la revendication 1, comprenant, en outre, un chapeau d'extrémité (35) sensiblement annulaire engagé fermement dans une extrémité dudit tube indicateur pour maintenir ladite valve (36) entre ledit tube indicateur (30) et ledit chapeau d'extrémité (35).
  5. Indicateur de quantité de poussière recueillie selon la revendication 4, dans lequel ledit chapeau d'extrémité (35) et ladite valve (36) font partie intégrante l'un de l'autre et sont formés d'un matériau élastique.
  6. Indicateur de quantité de poussière recueillie selon la revendication 1, dans lequel ledit tube indicateur (30) comporte une partie (37; 52) pouvant venir en contact avec ledit élément d'indication (31, 32; 50) pour limiter le déplacement dudit élément d'indication (31, 32; 50) en direction du côté pression atmosphérique.
  7. Indicateur de quantité de poussière recueillie selon la revendication 6, dans lequel le tube indicateur (30) a une structure à deux tubes comprenant un tube intérieur (37) s'étendant dans une direction opposé au côté pression atmosphérique, ledit tube intérieur (37) constituant ladite partie dudit tube indicateur (30).
  8. Indicateur de quantité de poussière recueillie selon la revendication 6, dans lequel ladite partie (52) dudit tube indicateur (30) comprend une partie (52) en gradin faisant saillie vers l'intérieur du dit tube indicateur (30).
EP19900122569 1989-11-27 1990-11-26 Indicateur de remplissage du sac à poussière d'un aspirateur Expired - Lifetime EP0430146B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP30701289A JPH03165725A (ja) 1989-11-27 1989-11-27 電気掃除機の集塵量表示装置
JP307012/89 1989-11-27
JP2063188A JPH0824644B2 (ja) 1990-03-14 1990-03-14 電気掃除機の集塵量表示装置
JP63188/90 1990-03-14
JP141112/90 1990-05-29
JP14111290A JPH0433629A (ja) 1990-05-29 1990-05-29 電気掃除機

Publications (2)

Publication Number Publication Date
EP0430146A1 EP0430146A1 (fr) 1991-06-05
EP0430146B1 true EP0430146B1 (fr) 1995-02-01

Family

ID=27298075

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900122569 Expired - Lifetime EP0430146B1 (fr) 1989-11-27 1990-11-26 Indicateur de remplissage du sac à poussière d'un aspirateur

Country Status (4)

Country Link
EP (1) EP0430146B1 (fr)
AU (1) AU622059B2 (fr)
DE (1) DE69016608T2 (fr)
ES (1) ES2070249T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9010969U1 (de) * 1990-07-24 1991-11-28 Siemens AG, 8000 München Anzeigevorrichtung für den Füllgrad eines in einem Staubsauger eingesetzten Filterbeutels
AU2004216122A1 (en) * 2003-02-26 2004-09-10 Black & Decker Inc. Hand vacuum with filter indicator
US7418763B2 (en) 2003-02-26 2008-09-02 Black & Decker Inc. Hand vacuum with filter indicator
JP5605124B2 (ja) * 2010-09-27 2014-10-15 パナソニック株式会社 集塵量表示装置及びそれを備えた電気掃除機
CN114365980A (zh) * 2021-11-26 2022-04-19 浙江欣奕华智能科技有限公司 一种尘满检测装置、基站及清洁系统

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE617417C (de) * 1933-12-31 1935-08-19 Inventia Patent Verwert Ges Einrichtung an mit Staubfilter bzw. Staubbeutel und einer Anzeigevorrichtung versehenen Staubsaugern
US2283831A (en) * 1939-07-08 1942-05-19 Hoover Co Bag pressure indicator for suction cleaners
US3119369A (en) * 1960-12-28 1964-01-28 Ametek Inc Device for indicating fluid flow
SE394076B (sv) * 1975-08-29 1977-06-06 Electrolux Ab Indikatoranordning for dammsugare.
SE395355B (sv) * 1975-12-05 1977-08-15 Electrolux Ab Indikatoranordning for dammsugare
US4416033A (en) * 1981-10-08 1983-11-22 The Hoover Company Full bag indicator

Also Published As

Publication number Publication date
EP0430146A1 (fr) 1991-06-05
DE69016608D1 (de) 1995-03-16
DE69016608T2 (de) 1995-06-14
ES2070249T3 (es) 1995-06-01
AU622059B2 (en) 1992-03-26
AU6697190A (en) 1991-05-30

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