EP0861628B1 - Kabelaufrollvorrichtung für Haushaltstaubsaugers und dergleichen - Google Patents

Kabelaufrollvorrichtung für Haushaltstaubsaugers und dergleichen Download PDF

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Publication number
EP0861628B1
EP0861628B1 EP19970830074 EP97830074A EP0861628B1 EP 0861628 B1 EP0861628 B1 EP 0861628B1 EP 19970830074 EP19970830074 EP 19970830074 EP 97830074 A EP97830074 A EP 97830074A EP 0861628 B1 EP0861628 B1 EP 0861628B1
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EP
European Patent Office
Prior art keywords
hubs
flex
hub
spool
housing
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
EP19970830074
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English (en)
French (fr)
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EP0861628A1 (de
Inventor
Silvano Fumagalli
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.)
Candy SpA
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Candy SpA
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Publication date
Application filed by Candy SpA filed Critical Candy SpA
Priority to DE1997601721 priority Critical patent/DE69701721T2/de
Priority to EP19970830074 priority patent/EP0861628B1/de
Publication of EP0861628A1 publication Critical patent/EP0861628A1/de
Application granted granted Critical
Publication of EP0861628B1 publication Critical patent/EP0861628B1/de
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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
    • A47L9/26—Incorporation of winding devices for electric cables

Definitions

  • the present invention relates to an automatic flex-rewinding device for domestic vacuum cleaners and the like (floor polishers, carpet sweepers), which could be defined as a universal device since, with a few minor constructional modifications which do not involve significant increases in manufacturing costs, it can be adapted to meet various requirements, whether of a dimensional or functional nature.
  • This device essentially consists of a flex-carrying spool that is pivoted on a spindle of a fixed support on the body of the vacuum cleaner and is held in a rest or retracted position by a coil spring, one end of which is attached to the support and the other to the spool.
  • the spool has a hub, with means for securing an electric flex, and a pair of sliding electrical contacts that engage with fixed contacts mounted on the spindle and connect the vacuum cleaner to the mains supply. Spools having these features are disclosed for example in US-A-3 808 382 or US-A-3 450 369.
  • the spool of some of these flex-rewinding devices may be made as a single piece by injection moulding a plastic material under pressure.
  • the spool produced in this way has the advantage of being in a single piece, the costs involved in its production are extremely high and are only justifiable in the case of mass production runs and especially runs in which the size or shape of the spool does not need to be modified, since the moulds do not easily or economically lend themselves to modifications to produce spools, and therefore flex-rewinding devices, of a different size or which fulfil a different function, for example which carry flex of a different length or offer the possibility of having both automatic and manual rewinding modes.
  • the flex-rewinding device that forms the subject of the present invention and which comprises a spool that is essentially formed by two flanged hubs, each of which is produced by moulding it in a simple mould and countermould, without the need for any additional sliding platens, which hubs are coupled together to form a spool by coupling and clamping means consisting, for example, of two simple self-tapping screws that can be easily screwed in via an end face of one of the hubs which is external to the spool.
  • At least one of the flanges is provided with means that position and couple it to a box housing a rewinding spring, and with a cylindrical friction ring that engages with a rewind-locking device, while the other flange is essentially flat and is optionally provided with means (for example one or more flared holes) via which it is coupled to a manual rewinding knob.
  • the flex is advantageously secured simply by forming a flex housing in the coupling plane between the two hubs, so that when the two hubs are clamped together, the flex is firmly secured.
  • a further problem encountered with flex-rewinding devices lies in the fact that the electrical connection between the mains flex and the electrical components in the appliance is provided by sliding contacts which, as a result of a faulty connection caused by dirt or oxidation of the contacts, can generate electric arcs (sparks) and high local temperatures, with the possibility of triggering combustion reactions.
  • a flex-rewinding device comprises a fixed support 1, known per se, via which the device is fixed to the appliance.
  • the support may be provided with reinforcement ribs 2.
  • Attached to the support which can be produced by moulding a plastic material, and perpendicular to it, is a hollow cylindrical body 3 that acts as a supporting pin or spindle for a flex-carrying spool.
  • the spindle 3 is expediently cut or opened along a cylindrical arc in order to allow electrical connections to pass from the outside into its hollow interior.
  • a spool Fitted on the spindle 3 is a spool that consists of a first cylindrical hub 4 having a flat circular flange 5 at its axial end closest to the support 1, and a second cylindrical hub 6 also having a flat circular flange 7, but at its axial end furthest away from the support 1.
  • the hubs 4, 6, which have the same diameter as the flange 5, are preferably, but not necessarily, of different axial length.
  • the two hubs are rigidly coupled together by means of two or more screws, preferably self-tapping screws, that screw into two diametrically opposite holes 8, 9 that extend in the axial direction of the hub 4.
  • Two eccentric and preferably straight grooves 10, 11, of semi-circular and semi-oval section respectively, are formed in the flat juxtaposed faces of the two hubs and, when these two hubs are coupled together, these grooves form two housings, of circular and oval section respectively, with dimensions suited to accommodating the plastic-sheathed electric flexes which are to be housed in the spool.
  • Transverse projections 12, 13 are formed in the grooves 10, 11 so that, when the screws that couple the two hubs together are loosened, the electric flex can easily be inserted in one of the housings formed by the grooves 10, 11, without having to disassemble the hubs completely and, when the screws are retightened, the flex is reliably secured, with the projections 12 or 13 acting as clamping jaws.
  • the projections 12, 13 can be located in a staggered position in the two hubs, in order to force the flex to follow a serpentine path which, without excessively deforming the plastic sheath, gives the flex an extremely efficient grip against tensile stresses.
  • the ends of the grooves 10, 11 which open out on to the periphery of the hubs are suitably connected to the cylindrical surface of the hubs in order to prevent the flex from being bent sharply as it is wound on the spool hub.
  • connections also allow electrical leads (each of which has its own insulating protection) to pass into a housing, formed in each of the two hubs, that has two terminals connecting up with sliding contacts.
  • this housing essentially consists of an axial recess 14, 15, formed on the periphery of the hub and extending from the hub face that is juxtaposed to the other hub towards the corresponding flange, and a cavity 16, 17, formed inside the hub, that extends axially and is open at least on the hub face that is aligned with the corresponding flange.
  • At least one of these internal cavities is closed at its other end by a hub wall that separates the two cavities in the two hubs and provides insulation between the terminals by means of a dielectric material that has a greater rigidity than air.
  • annular recess Formed in the face of the hubs 4, 6 that is coplanar with the flange is an annular recess that is coaxial with the axis of the hubs and houses two plastic washers 18, 19 respectively, which are in the shape of a toroidal cup and contain a fixed sliding contact ring, denoted 20, 21 respectively, which has projecting corrugations lying in the direction of the hub axis, each ring having a connection tab 22, 23 that extends radially inside the contact ring in order to connect up with the ends of electric wires provided with "conventional" attachments.
  • the tabs 22, 23 project through the axial opening in the pin 3 and right inside the pin so that the sliding contact rings 20, 21 and the associated washers are prevented from rotating on the pin 3.
  • the rotation of the washers 18, 19 with respect to the pin 3 can be prevented, not only by the tabs 22, 23, but also, for example, by providing a tooth that extends radially into the washer 18 and engages in the axial groove in the pin 3.
  • a similar arrangement can be used for the washer 19 which is fixed to the end of the pin 3 by means of a screw 24 (or a snap-fastening tooth) which can be loosened, together with the hub-clamping screws, in order to insert the electric flex into the relevant housing where it is secured.
  • each of the annular recesses located between the fixed electrical contacts 20, 21 and an internal stop piece at the bottom of the corresponding annular recess, are movable electrical contacts 25, 26 respectively, in the form of flat washers provided with brackets 27, 28 that support clamping terminals which face the grooves 14, 15 respectively in the hubs, in order to allow electrical connection of the flex ends.
  • the terminals can consist of threaded cavities which take screws for clamping eyelet terminals, but they could also be formed by conducting bushes for the insertion and screw-clamping of rheophores, or by other types of terminals known per se.
  • the flex-rewinding device formed by the support 1 and the spool consisting of the two flanged hubs is then completed in a known way, with an automatic rewinding spring 29 housed in a box 30 which is in turn inserted in a cylindrical ring 31 provided on the flange 5.
  • This ring is knurled on the outside so that it can engage in a known manner with a pawl 32 that is held by a spring and, when engaged, allows the flex to be unwound only from the spool (by pulling on the flex) and, when disengaged from the ring 31 by means of manual pressure on a push button 33 connected to the pawl, allows the flex to be rewound automatically.
  • the flex-rewinding device described may undergo numerous variations, for example, the structure of the spool, which is made up of two axially coupled half-elements, enables flex-rewinding devices with different characteristics to be produced, thereby satisfying the most diverse requirements.
  • peripheral axial grooves such as 14, 15 in the hubs 4 and 6, and terminal housings such as 16, 17 (which is obviously useful from the point of view of reducing the volume of material used and of ensuring that the moulded parts have a more uniform cross-section)
  • terminal housings such as 16, 17
  • the second securing recess (11 or 10) which has not been used can be used, or a special channel can be formed in the juxtaposed faces of the two hubs.
  • Positioning the terminals radially opposite each other is particularly important in the case of spools which have a reduced axial length since, if the terminals were placed in the same radial position, they would be so close together that the necessary electrical insulation could not be ensured.
  • the spool can be made with two flanged hubs of the same type, with the flange, for example the flange 7, not having a cylindrical ring.
  • the flange 7 can be provided at the moulding stage with one or more holes, such as the hole 34, for fixing a manual rewinding knob (optionally of the type that fits flush).
  • the flange 5 does not need to be provided with a cylindrical ring such as the ring 31 to house the box; instead, the periphery of the flange can be used as a stopping and braking drum that engages with a friction block or pawl.
  • This embodiment variant is represented in the diametral section shown in Fig. 5 (limited solely to the hubs) which differs from the embodiment of Fig. 1 only in that an annular housing for a bush or washer 35 made of fire-resistant material is formed in the hub 4, between the movable sliding contact 25 and the hub 4.
  • the cup-shaped washer 18, which contains the fixed sliding contact, is, of course, also made of fire-resistant material.
  • annular housing is formed in the hub 6 for a bush or washer 36 made of fire-resistant material, between the movable sliding contact 26 and the hub 6.
  • the washer 19 is made of fire-resistant material.
  • Figure 6 shows this variant in diametral section (limited solely to the hubs).
  • Figure 6 shows two terminal housings formed in one of the hubs, for example the hub 4, these housings being radially opposite each other with respect to the axis of the hub and consisting of an axial groove 14, 37 which is open on the periphery of the hub, and of an internal cavity 16, 38 respectively.
  • annular housing is formed in the end face of the hub 4, juxtaposed to the hub 6, to house a cup-shaped plastic washer 39 which in turn houses an enclosed fixed sliding contact ring 40, together with a rotating contact ring 41 in the shape of a flat washer which is integral in rotation with the hub 4, between the hub and the plastic washer 39.
  • the terminal of the rotating contact 41 is housed in the cavity 38.
  • a bush 35 made of fire-resistant material dielectrically separates the terminal of the rotating contact 41 from the rotating contact 25, even in the event of the terminal being stressed inappropriately and deformed.
  • the cup-shaped washer 39 is then held in position by coupling the two hubs 4 and 6 together.
  • the hubs are easily clamped together by screws that can be accessed on an external face of one of the spool flanges.
  • connection terminals are clamped by working between the flanges and, although quite straightforward, this may present some problems to an inexperienced operator.
  • Figure 7 shows this embodiment in a perspective exploded view which is limited to a single hub 4 and to the terminal block.
  • the hub 4 On its end face which is coupled to the other hub, the hub 4 has a prismatic opening 42 that extends as far as the diametric centre line of the hub, or even beyond this.
  • a segment-shaped tooth 43 formed integrally with the hub, extends into the opening 42.
  • a fixed sliding contact 20 is housed in the hub 4 and faces the opening 42, at least over a semi-circular arc.
  • the opening 42 (and the corresponding opening in the other hub) houses a removable plastic, and optionally fire-resistant, terminal block 44, which has a semi-cylindrical groove 45 in which the spool support pin is accommodated.
  • Two movable sliding contacts in the shape of flat half-rings 48, 49, are snap-fastened by means of retention teeth 46, 47 on to the end faces of the terminal block 44, perpendicular to the axis of the semi-cylindrical groove 45.
  • These movable sliding contacts have connection terminals 50, 51 that are housed in suitable recesses in the terminal block 44 body formed in the opposite face to that with the semi-cylindrical groove 45.
  • This same face has openings for fixing a flex grip 52 and two projections 53, 54 that engage with the segment 43 and the corresponding segment in the other hub respectively.
  • the terminal block 44 can also be produced by moulding it in a mould and countermould, without the need for sliding platens.
  • the projections 53, 54 engage with the retention segments and the terminal block is immobilized in the spool.
  • a second spring in addition to a first automatic rewinding spring, located on a first flange of the spool, a second spring can be provided which is juxtaposed to the second flange and wound in the same direction as the first spring but is coupled to the spool with a mechanism that inverts the direction of rotation.
  • the second spring is advantageously stressed when the first is relaxed.
  • the two springs work together to apply torques in the same direction to the spool, their strengths varying inversely according to the winding conditions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Storing, Repeated Paying-Out, And Re-Storing Of Elongated Articles (AREA)

Claims (6)

  1. Kabelaufrollvorrichtung für Haushaltsstaubsauger oder dergleichen, bei der eine das Kabel tragende Rolle (4,5,6,7) drehbar auf einer Spindel (3) einer festen Halterung (1) montiert ist, wobei diese Vorrichtung entweder mit einem Aufwikkelgriff oder mit einer Wendelfeder (29) versehen ist, die dazu dient, die Vorrichtung in einer Ruhestellung zu halten und deren eines Ende an der Halterung (1) und das andere an der Rolle befestigt ist, bei der ferner die Rolle mit Mitteln zum Halten des elektrischen Kabels und mit mindestens einem Paar von Gleitkontakten versehen ist, die mit feststehenden Kontakten in Berührung kommen,
    dadurch gekennzeichnet, dass
    die Rolle folgende Merkmale aufweist:
    eine erste mit einem Flansch versehene Nabe (4, 5), die drehbar auf der Spindel (3) angeordnet ist und durch Ausformen eines Kunststoffmateriales in einer Form und einer Gegenform hergestellt ist, die in einer Ebene senkrecht zu der Achse der ersten Nabe (4) miteinander verbunden werden, ohne dass irgendwelche quer verschiebbaren Traversen vorgesehen sein müssen,
    eine zweite, mit einem Flansch versehene Nabe (6, 7), die auf der Spindel (3) schwenkbar angeordnet ist und durch Ausformen eines Kunststoffmateriales in einer Form und einer Gegenform hergestellt wird, die in einer Ebene untereinander zusammengesetzt sind, die senkrecht zu der Achse der Nabe verläuft,
    die erste (4) und die zweite Nabe (6) sind untereinander in axialer Ausrichtung in einer Ebene senkrecht zu der Achse der Naben zusammengesetzt,
    Mittel (8, 9) zum axialen Zusammenkuppeln und Klemmen der ersten und der zweiten Nabe, die jeweils in die gegenüberliegenden Endseiten einer der Naben in die in der Kupplungsebene gelegene Seite einschraubbar sind,
    ein erster aus Kunststoff bestehender tassenförmig ausgebildeter Dichtungsring (18), der einen ersten festen, elektrischen Kontakt (20) aufnimmt und trägt und der sich in bezug zur ersten Naben drehen kann und in einer ersten ringförmigen Aufnahme in der der Kupplungsebene entgegengesetzten Stirnfläche der ersten Nabe (4) aufgenommen ist und der ferner mit Mitteln zur Drehsicherung versehen ist, die mit der Tragspindel in Eingriff stehen,
    ein zweiter aus Kunststoff bestehender tassenförmiger Dichtungsring (19), der einen zweiten festen elektrischen Kontakt (1) aufnimmt und trägt, wobei sich dieser Dichtungsring in bezug auf die zweite Nabe drehen läßt und in einer zweiten ringförmigen Aufnahme in der der Kupplungsebene entgegengesetzten Stirnfläche der zweiten Nabe (6) aufgenommen und mit Mitteln zur Drehsicherung versehen ist, die mit der Tragspindel in Eingriff stehen,
    ein Paar von Gleitkontakten (25,26,48,49), das mit den Naben (4, 6) drehbar ist und das jeweils in elektrischem Kontakt mit dem ersten (20) und zweiten festen elektrischen Kontakt (21) steht und das jeweils in der ersten und in der zweiten Nabe untergebracht ist, wobei jeder Gleitkontakt einen Anschluß (27,28,50,51) besitzt, der zum elektrischen Anschluß an das Elektrokabel dient, welches auf den Naben aufgewickelt ist.
  2. Kabelaufrollvorrichtung nach Anspruch 1, bei der die erste und die zweite Nabe in ihrer Kupplungsebene eine exzentrische durchgehende Aufnahme für ein Elektrokabel bilden, welches darin gesichert wird, wenn die Naben mit Hilfe der Kupplungsmittel zusammengeklemmt werden.
  3. Kabelaufrollvorrichtung nach Anspruch 1 oder 2, bei der die erste (4) und die zweite Nabe (6) jeweils eine dritte (14, 16) und vierte (15, 17) Aufnahme bilden, die längs der Peripherie der Naben offen sind und mit der ersten und zweiten ringförmigen Aufnahme jeweils in Verbindung stehen, so dass jede von ihnen einen der genannten elektrischen Verbindungsanschlüsse (27, 28) aufnimmt.
  4. Kabelaufrollvorrichtung nach Anspruch 1, 2 oder 3, bei der der erste (18) und der zweite Dichtungsring (19) aus feuerbeständigem Isolationsmaterial bestehen und jeweils ein Paar Buchsen (35, 36) ebenfalls aus feuerbeständigem Isolationsmaterial aufweisen, die jeweils in den ersten und zweiten Aufnahmen untergebracht sind.
  5. Kabelaufrollvorrichtung nach Anspruch 3, bei der die dritten (14, 16) und vierten (15, 17) Aufnahmen jeweils auf ihren jeweiligen Naben in diametral gegenüberliegenden Positionen wiederholt angeordnet sind.
  6. Kabelaufrollvorrichtung nach Anspruch 1, bei der die Naben eine dritte Aufnahme (42) für einen Anschlussblock (44) bilden, wobei diese Aufnahme längs der Peripherie der Naben offen ist und in Verbindung steht mit den ersten und zweiten Aufnahmen und wobei dieser Block Mittel (52) zur Sicherung des Elektrokabels, zum Tragen des Paares von Gleitkontakten (48, 49) der elektrischen Verbindungsanschlüsse (50, 51 aufweist und von der dritten Aufnahme durch Lösen der Kupplungs- und Klemmmittel entnehmbar ist.
EP19970830074 1997-02-21 1997-02-21 Kabelaufrollvorrichtung für Haushaltstaubsaugers und dergleichen Expired - Lifetime EP0861628B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1997601721 DE69701721T2 (de) 1997-02-21 1997-02-21 Kabelaufrollvorrichtung für Haushaltstaubsaugers und dergleichen
EP19970830074 EP0861628B1 (de) 1997-02-21 1997-02-21 Kabelaufrollvorrichtung für Haushaltstaubsaugers und dergleichen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19970830074 EP0861628B1 (de) 1997-02-21 1997-02-21 Kabelaufrollvorrichtung für Haushaltstaubsaugers und dergleichen

Publications (2)

Publication Number Publication Date
EP0861628A1 EP0861628A1 (de) 1998-09-02
EP0861628B1 true EP0861628B1 (de) 2000-04-19

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ID=8230574

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970830074 Expired - Lifetime EP0861628B1 (de) 1997-02-21 1997-02-21 Kabelaufrollvorrichtung für Haushaltstaubsaugers und dergleichen

Country Status (2)

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EP (1) EP0861628B1 (de)
DE (1) DE69701721T2 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3450369A (en) * 1967-08-15 1969-06-17 Alert Stamping & Mfg Reel construction having pawl optionally mounted
GB1356388A (en) * 1970-07-01 1974-06-12 British Domestic Appliances Winding mechanisms for electric cables
US3808382A (en) * 1971-03-15 1974-04-30 Alert Stamping & Mfg Electric cord reel construction

Also Published As

Publication number Publication date
EP0861628A1 (de) 1998-09-02
DE69701721D1 (de) 2000-05-25
DE69701721T2 (de) 2000-08-10

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