EP0861628A1 - Flex-rewinding device for domestic vacuum cleaners and the like - Google Patents
Flex-rewinding device for domestic vacuum cleaners and the like Download PDFInfo
- Publication number
- EP0861628A1 EP0861628A1 EP97830074A EP97830074A EP0861628A1 EP 0861628 A1 EP0861628 A1 EP 0861628A1 EP 97830074 A EP97830074 A EP 97830074A EP 97830074 A EP97830074 A EP 97830074A EP 0861628 A1 EP0861628 A1 EP 0861628A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hubs
- flex
- hub
- spool
- rewinding device
- 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.)
- Granted
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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.
- the spool in these flex-rewinding devices is 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 "faston" 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)
Abstract
Description
- Figure 1 is a diametral section through a first embodiment of a flex-rewinding device according to the present invention,
- Figure 2 is a view of the device of Fig. 1, limited to the spool hub only, on the plane A-A in Fig.1,
- Figure 3 is a view of the device of Fig. 1, limited to the spool hub only, on the plane B-B in Fig.1,
- Figure 4 is a view of the device of Fig. 1, limited to the spool hub only, on the plane C-C in Fig.1,
- Figure 5 is a diametral section, limited to the spool hub only, of a first variant of the device in Fig.1,
- Figure 6 is a diametral section, limited to the spool hub only, of a second variant of the device in Fig.1,
- Figure 7 is an exploded perspective view, limited to the spool hub only, of a third variant of the device in Fig. 1.
Claims (6)
- Flex-rewinding device for domestic vacuum cleaners and the like, of the type in which a flex-carrying spool (4, 5, 6, 7) is pivoted on a spindle (3) of a fixed support (1) and may be held in a rest position by a coil spring (29), one end of which is attached to said support (1) and the other to said spool, said spool being provided with means for securing the electric flex and with at least one pair of sliding contacts that engage with fixed contacts on said spindle,
characterized in that said spool comprisesa first flanged hub (4, 5) pivoted on said spindle (3) and produced by moulding a plastic material in a mould and countermould which are coupled together in a plane perpendicular to the axis of said first hub (4), without any transverse sliding platen;a second flanged hub (6, 7) pivoted on said spindle (3) and produced by moulding a plastic material in a mould and countermould which are coupled together in a plane perpendicular to the axis of said hub,
said first (4) and second (6) hubs being coupled together in axial alignment on a plane perpendicular to the axis of said hubs,means (8, 9) for axially coupling and clamping said first and second hubs together, which means can be screwed in on the opposite end face of one of said hubs to that on the said coupling plane;a first plastic cup-shaped washer (18) that supports and accommodates a first fixed electrical contact (20), which washer can rotate with respect to said first hub, is housed in a first annular housing formed in the opposite face of said first hub (4) to that on the said coupling plane, and is provided with rotation-locking means that engage with said support spindle;a second plastic cup-shaped washer (19) that supports and accommodates a second fixed electrical contact (21), which washer can rotate with respect to said second hub, is housed in a second annular housing formed in the opposite face of said second hub (6) to that on said coupling plane, and is provided with rotation-locking means that engage with said support spindle;at least one pair of sliding contacts (25, 26, 48, 49) that can rotate together with said hubs (4, 6), are in electrical contact with said first (20) and second (21) fixed electrical contacts respectively, and are housed in said first and second hubs respectively, each of the sliding contacts having a terminal (27, 28, 50, 51) that provides the electrical connection with an electric flex wound on said hubs. - Flex-rewinding device according to Claim 1, in which said first and second hubs form, in the coupling plane, an eccentric through housing for an electric flex which is secured therein when said hubs are clamped together by means of said coupling means.
- Flex-rewinding device according to Claim 1 or 2, in which said first (4) and second (6) hubs form a third (14, 16) and fourth (15, 17) housing respectively, these housings being open along the periphery of said hubs and communicating with said first and second annular housings respectively so that each of them houses one of said electrical connection terminals (27, 28).
- Flex-rewinding device according to Claim 1, 2 or 3 in which said first (18) and second (19) washers are made of fire-resistant insulating material and which also comprises a pair of bushes (35, 36) made of fire-resistant insulating material which are housed in said first and second housings respectively.
- Flex-rewinding device according to Claim 3, in which said third (14, 16) and fourth (15, 17) housings are respectively repeated in diametrically opposite positions on their respective hubs.
- Flex-rewinding device according to Claim 1, in which said hubs form a third housing (42) for a terminal block (44), which housing is open along the periphery of said hubs and communicates with said first and second housings, said block having means (52) for securing the electric flex, supporting said pair of sliding contacts (48, 49), said electrical-connection terminals (50, 51), and being removable from said third housing by loosening said coupling and clamping means.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19970830074 EP0861628B1 (en) | 1997-02-21 | 1997-02-21 | Flex-rewinding device for domestic vacuum cleaners and the like |
DE1997601721 DE69701721T2 (en) | 1997-02-21 | 1997-02-21 | Cable retractor for household vacuum cleaners and the like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19970830074 EP0861628B1 (en) | 1997-02-21 | 1997-02-21 | Flex-rewinding device for domestic vacuum cleaners and the like |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0861628A1 true EP0861628A1 (en) | 1998-09-02 |
EP0861628B1 EP0861628B1 (en) | 2000-04-19 |
Family
ID=8230574
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19970830074 Expired - Lifetime EP0861628B1 (en) | 1997-02-21 | 1997-02-21 | Flex-rewinding device for domestic vacuum cleaners and the like |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0861628B1 (en) |
DE (1) | DE69701721T2 (en) |
Citations (3)
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 |
US3808382A (en) * | 1971-03-15 | 1974-04-30 | Alert Stamping & Mfg | Electric cord reel construction |
GB1356388A (en) * | 1970-07-01 | 1974-06-12 | British Domestic Appliances | Winding mechanisms for electric cables |
-
1997
- 1997-02-21 DE DE1997601721 patent/DE69701721T2/en not_active Expired - Lifetime
- 1997-02-21 EP EP19970830074 patent/EP0861628B1/en not_active Expired - Lifetime
Patent Citations (3)
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 |
---|---|
DE69701721D1 (en) | 2000-05-25 |
DE69701721T2 (en) | 2000-08-10 |
EP0861628B1 (en) | 2000-04-19 |
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