US20120187596A1 - Support assembly - Google Patents
Support assembly Download PDFInfo
- Publication number
- US20120187596A1 US20120187596A1 US13/436,034 US201213436034A US2012187596A1 US 20120187596 A1 US20120187596 A1 US 20120187596A1 US 201213436034 A US201213436034 A US 201213436034A US 2012187596 A1 US2012187596 A1 US 2012187596A1
- Authority
- US
- United States
- Prior art keywords
- roller
- support assembly
- overmold
- tires
- thermoplastic elastomer
- 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.)
- Abandoned
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Classifications
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- 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
- A47L9/22—Mountings for motor fan assemblies
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- 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
- A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
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- 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
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
- A47L5/28—Suction cleaners with handles and nozzles fixed on the casings, e.g. wheeled suction cleaners with steering handle
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- 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
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
- A47L5/28—Suction cleaners with handles and nozzles fixed on the casings, e.g. wheeled suction cleaners with steering handle
- A47L5/30—Suction cleaners with handles and nozzles fixed on the casings, e.g. wheeled suction cleaners with steering handle with driven dust-loosening tools, e.g. rotating brushes
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- 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
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
- A47L5/36—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back
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- 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
- A47L9/009—Carrying-vehicles; Arrangements of trollies or wheels; Means for avoiding mechanical obstacles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B11/00—Units comprising multiple wheels arranged side by side; Wheels having more than one rim or capable of carrying more than one tyre
- B60B11/04—Wheels with a rim capable of carrying more than one tyre
Definitions
- This invention relates to a support assembly for a surface treating head or a surface treating appliance, such as a vacuum cleaner, a surface treating appliance including a support assembly and a method for manufacturing a support assembly, or a portion of a support assembly, for a surface treating appliance
- DC15 is a trade mark of Dyson Limited.
- DC15 comprises a main body, which houses the main components of the vacuum cleaner, including separating apparatus for separating dirt, dust and other debris from a dirty airflow drawn in by a motor-driven fan.
- a cleaner head is mounted to the lower end of the main body.
- a support assembly in the form of a barrel-shaped roller.
- the roller permits the cleaner to be easily manoeuvred.
- a user reclines the main body of the vacuum cleaner and then pushes and pulls a handle which is fixed to the main body of the cleaner.
- the vacuum cleaner rolls along the floor surface on the roller, and may be steered by the user twisting the handle about its longitudinal axis. This cleaner is much more manoeuvrable than previous cleaners employing wheels.
- Various components of the cleaner are mounted within the roller as a space-saving measure.
- the roller has a plurality of tires which are mechanically fixed to it and help to make the roller more hard wearing and easier to steer.
- a problem which may be encountered with this support assembly is that the tire(s) may become disconnected from the roller.
- a first aspect of the present invention provides a support assembly for a surface treating appliance comprising a roller having one or more tires, wherein the one or more tires are fused to the roller.
- the term “fused” shall be taken to mean that the roller and the one or more tires are bonded together rather than mechanically connected to each other. This advantageously helps to prevent the one or more tires separating from the roller over time. It also may advantageously reduce the amount of material necessary to make the tires and therefore it may also advantageously reduce the costs involved in making the support assembly.
- roller and the one or more tires are fused together by at least partially melting and solidifying them together.
- the roller may comprise a polymer, for example polypropylene.
- the polypropylene may comprise a glass filled impact modified copolymer, for example a 20% glass filed impact modified copolymer.
- the one or more tires may comprise a thermoplastic elastomer, for example a modified polymer.
- the modified polymer may comprise a mixture of polypropylene and an ethylene propylene diene monomer, for example the modified polymer sold under the trade name Santoprene®.
- the thermoplastic elastomer may be from 55 to 95 Duro measured on the A scale. More preferably the thermoplastic elastomer may be from 70 to 79 Duro on the A scale, for example 75 Duro A. Alternatively the thermoplastic elastomer may be from 80 to 95 Duro on the A scale, for example 90 Duro A.
- the roller preferably defines a substantially continuous rolling support surface.
- the one or more tires are rectangular or substantially rectangular in cross section. Alternatively they may be square or substantially square in cross section.
- the surface of the one or more tires which faces outwardly may be curved.
- the roller preferably comprises a plurality of tires. The tires may run parallel or substantially parallel to each other. In a preferred embodiment the tires may be equally spaced.
- the one or more tires may be from 3, or 5, or 7, or 10, or 12 to 14 or 16, or 18 or 20 mm in diameter.
- the support assembly may be a single unit. In an alternative embodiment the support assembly may be formed from a number of parts which are fixed together in any suitable manner.
- a second aspect of the present invention provides a surface treating appliance including a support assembly as described above.
- the roller delimits a region housing a component of the appliance.
- the surface treating appliance may be a vacuum cleaner.
- a third aspect of the present invention provides a method for manufacturing a support assembly or a portion of a support assembly, for a surface treating appliance comprising the steps of a) placing a roller or a portion of a roller, made of a first material which has a first melting temperature, into an over mold b) overmolding one or more tires onto the roller or portion of the roller by introducing a second material in a molten state into the over mold c) allowing the second material to solidify d) separating the support assembly or portion of the support assembly from the overmold,
- the second material is introduced into the overmold at a temperature which is higher than the first melting temperature.
- the method may also comprise a further step x) before step a) of forming a roller or portion of a roller.
- the roller or portion of the roller may be formed by injection molding the first material into the shape of a roller or portion of a roller.
- the one or more tires may be overmolded onto the roller or portion of the roller by introducing the second material in a molten state into a channel or a plurality of channels formed between the roller or portion of the roller, and the over mold.
- the roller or portion of the roller may be formed with one or more channels on its outer surface. Additionally or alternatively the overmold may comprise one or more channels.
- the first material preferably comprises a polymer for example polypropylene.
- the polypropylene may comprise a glass filled impact modified copolymer, for example a 20% glass filed impact modified copolymer, for example a 20% glass filed impact modified copolymer with a melting temperature of around 167° C. or 167° C.
- the first material is injection molded at from 220, or 225, or 230, or 235, or 240 to 245, or 250, or, 255, or 260, or 265, or 270° C.
- the first material is injection molded at from 230 to 270° C.
- the second material may comprise a thermoplastic elastomer, for example a modified polymer.
- the modified polymer may comprise a mixture of polypropylene and an ethylene propylene diene monomer, for example the commercially available thermoplastic elastomer Santoprene® which has a melting temperature of around 150° C. or 150° C.
- thermoplastic elastomer having a Duro measurement on the A scale of from 55 to 95, more preferably from 70 to 79 Duro A or from 80 to 95 Duro A is used in step b) to form the one or more tires.
- the thermoplastic elastomer may be 75 or 90 Duro A.
- the second material is introduced into the overmold at from 170, or 175, or 180, or 185, or 190, or 195, or 200 to 205, or 210, 215, or 220, or 225, or 230° C., preferably at between 210 and 215° C. Because the second material is introduced into the overmold at a temperature which is higher than the first melting temperature the first material will melt on contact with the second material causing the first and second materials at the points of contact to mix at least slightly.
- surface treating appliance is intended to have a broad meaning, and includes a wide range of machines having a head for travelling over a surface to clean or treat the surface in some manner. It includes, inter alia, machines which apply suction to the surface so as to draw material from it, such as vacuum cleaners (dry, wet and wet/dry), as well as machines which apply material to the surface, such as polishing/waxing machines, pressure washing machines, ground marking machines and shampooing machines. It also includes lawn mowers and other cutting machines.
- roller is intended to encompass wheels and rolling surfaces in general.
- FIG. 1 is a perspective view of a vacuum cleaner incorporating the support assembly of the present invention
- FIG. 2 is a view of the support assembly of the present invention
- FIG. 3 is a perspective view of a portion of a roller according to the present invention.
- FIG. 4 is an exploded view of the support assembly
- FIG. 5 is a close up view of a tire and roller according to the present invention.
- FIG. 6 is a close up view of a section of roller positioned in an overmold according to the present invention.
- a surface treating appliance is shown in the form of a vacuum cleaner and is indicated generally by the reference numeral 1 .
- the vacuum cleaner 1 comprises a main body 2 , a cleaner head 4 and a rolling support assembly indicated generally at 5 for rolling the cleaner 1 along a floor surface.
- the rolling support assembly 5 houses a motor and fan for generating a suction airflow (not visible in this drawing).
- the main body 2 houses a separating apparatus 3 for separating dirt, dust and other debris from a dirty airflow drawn into the cleaner 1 by the fan and motor.
- the separating apparatus 3 is cyclonic, in which the dirt and dust is spun from the airflow.
- the cyclonic separating apparatus 3 comprises two stages of cyclonic separation arranged in series with one another.
- the first stage is a cylindrically-walled chamber 10 and the second stage comprises a set of tapering, substantially frusto-conically shaped chambers 11 arranged in parallel with one another.
- Airflow is directed tangentially into the upper part of the chamber 10 . Larger debris and particles are removed and collected in the lower part of the chamber 10 .
- the airflow then passes through a shroud 12 to the set of smaller frusto-conically shaped cyclonic chambers 11 . Finer dust is separated by these chambers 11 and the separated dust is collected in a common collecting region (not visible in this drawing).
- the cleaner 1 also houses filters (not visible in this drawing) for trapping fine particles in the cleaned airflow. These filters remove any fine particles of dust which have not already been removed from the airflow by the separating apparatus 3 .
- a first filter called a pre-motor filter, is provided before the motor and fan.
- a second filter called a post-motor filter, is provided after the motor and fan. Where the motor for driving the suction fan has carbon brushes, the post-motor filter also serves to trap any carbon particles emitted by the brushes. Clean air is then expelled to the atmosphere.
- the cleaner head 4 is pivotably mounted to the lower end of the main body 2 , and serves, in use, to treat the floor surface.
- the rolling support assembly 5 permits the cleaner 1 to be manoeuvred along a floor surface.
- a stand may be provided (not visible in this drawing).
- a user-operable wand handle 6 extends upwardly from the rear part of the main body 2 .
- the wand handle 6 may be released and used as a hose and wand assembly.
- a changeover valve (not visible in this drawing) on the main body 2 automatically connects the dust separating apparatus 3 to the wand and hose so that cleaner 1 can be used in cylinder mode for above the floor cleaning. Air is drawn into the cleaner 1 through the end of the wand which can be released from the cleaner 1 for appropriate manipulation. The inlet in the cleaner head 4 is automatically shut off.
- the user reclines the main body 2 .
- the changeover valve automatically shuts off the air inlet at the distal end of the wand handle 6 and connects the dust separating apparatus 3 to the inlet in the cleaner head 4 .
- the cleaner head 4 is connected to the main body 2 of the vacuum cleaner 1 in such a manner that the cleaner head 4 remains in contact with a floor surface as the main body 2 is manoeuvred through a wide range of operating positions, e.g. when moved from side-to-side or when the main body 2 is twisted about its longitudinal axis 8 .
- a linkage in the form of a yoke 13 forms a connection between the main body 2 and the cleaner head 4 .
- the yoke 13 comprises a shell, which is molded to incorporate two rotational axes 14 , 15 .
- the first axis 14 which extends across the sides of the shell, permits the main body 2 to pivot with respect to the yoke 13 when it is reclined for a cleaning operation in the upright mode.
- the second axis 15 which depends from the front of the shell, permits the head 4 to turn with respect to the yoke 13 when the cleaner is being steered along a floor surface.
- the two axes 14 , 15 are transverse to each other. This arrangement permits the cleaner 1 to be more easily manoeuvred than traditional vacuum cleaners.
- the support assembly as shown in FIGS. 2 and 4 comprises an elongated and barrel-shaped roller 17 .
- This shape helps to provide both stability and manoeuvrability.
- a plurality of tires 9 are fused around the circumference of the roller 17 to form the support assembly 5 .
- the tires 9 provide extra grip as the support assembly 5 is rolled along a surface to be treated.
- the roller 17 and the tires 9 are fused by melting and solidifying them together.
- the support assembly 5 may be a single piece as shown in FIG. 2 or alternatively may comprise a number of portions 18 as shown in FIG. 4 .
- the tires 9 are substantially rectangular in cross section, having curved edges. Alternatively they may be square or ovoid. In the embodiment shown in FIGS. 2 and 4 it can be seen that there are 6 tires 9 which run parallel to each other and are equally spaced. The number of tires 9 may vary but preferably there is an even number.
- the roller 17 is formed from a 20% glass filled polypropylene which has a melting temperature of 167° C. and the tires 9 are formed of Santoprene® which has a melting temperature of 150° C. Two grades of Santoprene® are particularly preferred, 75 Duro A and 90 Duro A.
- the roller 17 shown in FIG. 3 is preferably formed by injection molding. 20% glass filed polypropylene at between 230° C. and 270° C. is injected into a mold (not shown) for making a roller 17 or portion of the roller 17 . The polypropylene is then allowed to solidify and the formed roller 17 or portion of the roller 17 is then separated from the mold.
- the roller 17 or portion of the roller 17 is then placed into an overmold 23 (see FIG. 6 ).
- One or more tires 9 are then overmolded onto the roller 17 or portion of the roller 17 by introducing molten Santoprene® into a plurality of channels 20 formed between the roller 17 or the portion of the roller 17 and the over mold 23 .
- Santoprene® is preferably introduced into the channels 20 at between 200° C. and 230° C., preferably at between 210° C. and 215° C. At this temperature the polypropylene which it comes into contact with will start to melt.
- the roller 17 or portion of the roller 17 is formed with integral channels 20 .
- These channels 20 preferably have a flexible tip 21 which bend when the roller 17 or portion of the roller 17 is placed in the overmold 23 and the tips 21 contact the overmold 23 .
- These flexible tips 21 form a seal against the overmold 23 so that when molten Santoprene® is introduced into the channels 20 it does not leak and therefore forms even tires 9 bounded by the channel walls 22 .
- the Santoprene® After the Santoprene® has been added to the overmold 23 it is allowed to cool. Once cooled the formed support assembly 5 or portions 18 of the support assembly 5 can be removed from the overmold 23 .
- the portions 18 can be joined together to make a complete support assembly 5 after overmolding the tires 9 .
- rollers 9 can be joined together to make a complete roller 17 before overmolding the tires 9 onto it to become a support assembly 5 .
- the invention has been described with reference to a support assembly 5 for a vacuum cleaner 1 , the invention is applicable to a rolling support assembly 5 for a tool for such a cleaner 1 .
- vacuum cleaner 1 in which ducts carry airflow
- the invention can be applied to vacuum cleaners 1 which carry other fluids, such as water and detergents, as well as other surface-treating appliances.
Abstract
A support assembly for a surface treating appliance includes a roller having one or more tires, wherein the one or more tires are fused to the roller. The roller can include a polymer such as polypropylene and may also include a glass filled impact modified copolymer such as a 20% glass filed impact modified copolymer. The tires can include a thermoplastic elastomer such as a modified polymer including a mixture of polypropylene and an ethylene propylene diene monomer. The thermoplastic elastomer may have a hardness of from 55 to 95 Duro measured on the A scale, more specifically from 70 to 79 Duro on the A scale or from 80 to 95 Duro on the A scale
Description
- This application is a divisional of U.S. patent application Ser. No. 12/276,079, filed Nov. 21, 2008, which claims the priority of United Kingdom Application No. 0723027.9, filed Nov. 23, 2007, the contents of which are incorporated herein by reference.
- This invention relates to a support assembly for a surface treating head or a surface treating appliance, such as a vacuum cleaner, a surface treating appliance including a support assembly and a method for manufacturing a support assembly, or a portion of a support assembly, for a surface treating appliance
- Surface treating appliances such as vacuum cleaners and floor polishers are well known. The majority of vacuum cleaners are either of the ‘upright’ type or of the ‘cylinder’ type, called canister or barrel cleaners in some countries. An example of an upright vacuum cleaner manufactured by Dyson Limited is that sold under the name DC15 (“DC15” is a trade mark of Dyson Limited). DC15 comprises a main body, which houses the main components of the vacuum cleaner, including separating apparatus for separating dirt, dust and other debris from a dirty airflow drawn in by a motor-driven fan. A cleaner head is mounted to the lower end of the main body.
- Also at the lower end of the main body is a support assembly in the form of a barrel-shaped roller. The roller permits the cleaner to be easily manoeuvred. In use, a user reclines the main body of the vacuum cleaner and then pushes and pulls a handle which is fixed to the main body of the cleaner. The vacuum cleaner rolls along the floor surface on the roller, and may be steered by the user twisting the handle about its longitudinal axis. This cleaner is much more manoeuvrable than previous cleaners employing wheels. Various components of the cleaner are mounted within the roller as a space-saving measure. The roller has a plurality of tires which are mechanically fixed to it and help to make the roller more hard wearing and easier to steer.
- A problem which may be encountered with this support assembly is that the tire(s) may become disconnected from the roller.
- A first aspect of the present invention provides a support assembly for a surface treating appliance comprising a roller having one or more tires, wherein the one or more tires are fused to the roller.
- As used herein the term “fused” shall be taken to mean that the roller and the one or more tires are bonded together rather than mechanically connected to each other. This advantageously helps to prevent the one or more tires separating from the roller over time. It also may advantageously reduce the amount of material necessary to make the tires and therefore it may also advantageously reduce the costs involved in making the support assembly.
- In a preferred embodiment the roller and the one or more tires are fused together by at least partially melting and solidifying them together.
- The roller may comprise a polymer, for example polypropylene. In a particular embodiment the polypropylene may comprise a glass filled impact modified copolymer, for example a 20% glass filed impact modified copolymer.
- The one or more tires may comprise a thermoplastic elastomer, for example a modified polymer. In a particular example the modified polymer may comprise a mixture of polypropylene and an ethylene propylene diene monomer, for example the modified polymer sold under the trade name Santoprene®.
- The thermoplastic elastomer may be from 55 to 95 Duro measured on the A scale. More preferably the thermoplastic elastomer may be from 70 to 79 Duro on the A scale, for example 75 Duro A. Alternatively the thermoplastic elastomer may be from 80 to 95 Duro on the A scale, for example 90 Duro A.
- The roller preferably defines a substantially continuous rolling support surface. In a particular embodiment the one or more tires are rectangular or substantially rectangular in cross section. Alternatively they may be square or substantially square in cross section. In a particular embodiment, the surface of the one or more tires which faces outwardly may be curved. The roller preferably comprises a plurality of tires. The tires may run parallel or substantially parallel to each other. In a preferred embodiment the tires may be equally spaced. The one or more tires may be from 3, or 5, or 7, or 10, or 12 to 14 or 16, or 18 or 20 mm in diameter.
- In an embodiment the support assembly may be a single unit. In an alternative embodiment the support assembly may be formed from a number of parts which are fixed together in any suitable manner.
- A second aspect of the present invention provides a surface treating appliance including a support assembly as described above. In a preferred embodiment the roller delimits a region housing a component of the appliance. In a particularly preferred embodiment the surface treating appliance may be a vacuum cleaner.
- A third aspect of the present invention provides a method for manufacturing a support assembly or a portion of a support assembly, for a surface treating appliance comprising the steps of a) placing a roller or a portion of a roller, made of a first material which has a first melting temperature, into an over mold b) overmolding one or more tires onto the roller or portion of the roller by introducing a second material in a molten state into the over mold c) allowing the second material to solidify d) separating the support assembly or portion of the support assembly from the overmold,
- wherein the second material is introduced into the overmold at a temperature which is higher than the first melting temperature.
- The method may also comprise a further step x) before step a) of forming a roller or portion of a roller. The roller or portion of the roller may be formed by injection molding the first material into the shape of a roller or portion of a roller.
- In a particular embodiment, in step b) the one or more tires may be overmolded onto the roller or portion of the roller by introducing the second material in a molten state into a channel or a plurality of channels formed between the roller or portion of the roller, and the over mold.
- In a preferred embodiment in step x) the roller or portion of the roller may be formed with one or more channels on its outer surface. Additionally or alternatively the overmold may comprise one or more channels.
- The first material preferably comprises a polymer for example polypropylene. The polypropylene may comprise a glass filled impact modified copolymer, for example a 20% glass filed impact modified copolymer, for example a 20% glass filed impact modified copolymer with a melting temperature of around 167° C. or 167° C. Preferably in step x) the first material is injection molded at from 220, or 225, or 230, or 235, or 240 to 245, or 250, or, 255, or 260, or 265, or 270° C. In a preferred embodiment in step x) the first material is injection molded at from 230 to 270° C.
- The second material may comprise a thermoplastic elastomer, for example a modified polymer. In a preferred embodiment the modified polymer may comprise a mixture of polypropylene and an ethylene propylene diene monomer, for example the commercially available thermoplastic elastomer Santoprene® which has a melting temperature of around 150° C. or 150° C.
- Preferably a thermoplastic elastomer having a Duro measurement on the A scale of from 55 to 95, more preferably from 70 to 79 Duro A or from 80 to 95 Duro A is used in step b) to form the one or more tires. In a particularly preferred embodiment the thermoplastic elastomer may be 75 or 90 Duro A.
- In a preferred embodiment in step b) the second material is introduced into the overmold at from 170, or 175, or 180, or 185, or 190, or 195, or 200 to 205, or 210, 215, or 220, or 225, or 230° C., preferably at between 210 and 215° C. Because the second material is introduced into the overmold at a temperature which is higher than the first melting temperature the first material will melt on contact with the second material causing the first and second materials at the points of contact to mix at least slightly.
- The term “surface treating appliance” is intended to have a broad meaning, and includes a wide range of machines having a head for travelling over a surface to clean or treat the surface in some manner. It includes, inter alia, machines which apply suction to the surface so as to draw material from it, such as vacuum cleaners (dry, wet and wet/dry), as well as machines which apply material to the surface, such as polishing/waxing machines, pressure washing machines, ground marking machines and shampooing machines. It also includes lawn mowers and other cutting machines.
- Use of the term “roller” is intended to encompass wheels and rolling surfaces in general.
- The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
-
FIG. 1 is a perspective view of a vacuum cleaner incorporating the support assembly of the present invention; -
FIG. 2 is a view of the support assembly of the present invention; -
FIG. 3 is a perspective view of a portion of a roller according to the present invention; -
FIG. 4 is an exploded view of the support assembly; -
FIG. 5 is a close up view of a tire and roller according to the present invention; and -
FIG. 6 is a close up view of a section of roller positioned in an overmold according to the present invention. - All figures are schematic. Like reference numerals refer to like parts throughout the specification.
- With reference to
FIG. 1 , a surface treating appliance is shown in the form of a vacuum cleaner and is indicated generally by thereference numeral 1. Thevacuum cleaner 1 comprises amain body 2, a cleaner head 4 and a rolling support assembly indicated generally at 5 for rolling thecleaner 1 along a floor surface. The rollingsupport assembly 5 houses a motor and fan for generating a suction airflow (not visible in this drawing). Themain body 2 houses a separatingapparatus 3 for separating dirt, dust and other debris from a dirty airflow drawn into thecleaner 1 by the fan and motor. - In this embodiment, the separating
apparatus 3 is cyclonic, in which the dirt and dust is spun from the airflow. Thecyclonic separating apparatus 3 comprises two stages of cyclonic separation arranged in series with one another. The first stage is a cylindrically-walled chamber 10 and the second stage comprises a set of tapering, substantially frusto-conically shapedchambers 11 arranged in parallel with one another. Airflow is directed tangentially into the upper part of thechamber 10. Larger debris and particles are removed and collected in the lower part of thechamber 10. The airflow then passes through ashroud 12 to the set of smaller frusto-conically shapedcyclonic chambers 11. Finer dust is separated by thesechambers 11 and the separated dust is collected in a common collecting region (not visible in this drawing). - The
cleaner 1 also houses filters (not visible in this drawing) for trapping fine particles in the cleaned airflow. These filters remove any fine particles of dust which have not already been removed from the airflow by the separatingapparatus 3. A first filter, called a pre-motor filter, is provided before the motor and fan. A second filter, called a post-motor filter, is provided after the motor and fan. Where the motor for driving the suction fan has carbon brushes, the post-motor filter also serves to trap any carbon particles emitted by the brushes. Clean air is then expelled to the atmosphere. - The cleaner head 4 is pivotably mounted to the lower end of the
main body 2, and serves, in use, to treat the floor surface. - The rolling
support assembly 5 permits thecleaner 1 to be manoeuvred along a floor surface. In order to provide extra support for thecleaner 1 when themain body 2 is in the vertical position a stand may be provided (not visible in this drawing). - A user-operable wand handle 6 extends upwardly from the rear part of the
main body 2. The wand handle 6 may be released and used as a hose and wand assembly. A changeover valve (not visible in this drawing) on themain body 2 automatically connects thedust separating apparatus 3 to the wand and hose so that cleaner 1 can be used in cylinder mode for above the floor cleaning. Air is drawn into thecleaner 1 through the end of the wand which can be released from thecleaner 1 for appropriate manipulation. The inlet in the cleaner head 4 is automatically shut off. - When the
cleaner 1 is to be used in conventional upright mode, the user reclines themain body 2. The changeover valve automatically shuts off the air inlet at the distal end of thewand handle 6 and connects thedust separating apparatus 3 to the inlet in the cleaner head 4. - The cleaner head 4 is connected to the
main body 2 of thevacuum cleaner 1 in such a manner that the cleaner head 4 remains in contact with a floor surface as themain body 2 is manoeuvred through a wide range of operating positions, e.g. when moved from side-to-side or when themain body 2 is twisted about itslongitudinal axis 8. A linkage in the form of ayoke 13 forms a connection between themain body 2 and the cleaner head 4. Theyoke 13 comprises a shell, which is molded to incorporate tworotational axes first axis 14, which extends across the sides of the shell, permits themain body 2 to pivot with respect to theyoke 13 when it is reclined for a cleaning operation in the upright mode. Thesecond axis 15, which depends from the front of the shell, permits the head 4 to turn with respect to theyoke 13 when the cleaner is being steered along a floor surface. The twoaxes cleaner 1 to be more easily manoeuvred than traditional vacuum cleaners. - The support assembly as shown in
FIGS. 2 and 4 comprises an elongated and barrel-shapedroller 17. This shape helps to provide both stability and manoeuvrability. A plurality oftires 9 are fused around the circumference of theroller 17 to form thesupport assembly 5. Thetires 9 provide extra grip as thesupport assembly 5 is rolled along a surface to be treated. Theroller 17 and thetires 9 are fused by melting and solidifying them together. Thesupport assembly 5 may be a single piece as shown inFIG. 2 or alternatively may comprise a number ofportions 18 as shown inFIG. 4 . - In the embodiments shown in
FIGS. 2 and 4 and the close up shown inFIG. 5 it can be seen that thetires 9 are substantially rectangular in cross section, having curved edges. Alternatively they may be square or ovoid. In the embodiment shown inFIGS. 2 and 4 it can be seen that there are 6tires 9 which run parallel to each other and are equally spaced. The number oftires 9 may vary but preferably there is an even number. - In a particular embodiment the
roller 17 is formed from a 20% glass filled polypropylene which has a melting temperature of 167° C. and thetires 9 are formed of Santoprene® which has a melting temperature of 150° C. Two grades of Santoprene® are particularly preferred, 75 Duro A and 90 Duro A. - The
roller 17 shown inFIG. 3 is preferably formed by injection molding. 20% glass filed polypropylene at between 230° C. and 270° C. is injected into a mold (not shown) for making aroller 17 or portion of theroller 17. The polypropylene is then allowed to solidify and the formedroller 17 or portion of theroller 17 is then separated from the mold. - The
roller 17 or portion of theroller 17 is then placed into an overmold 23 (seeFIG. 6 ). One ormore tires 9 are then overmolded onto theroller 17 or portion of theroller 17 by introducing molten Santoprene® into a plurality ofchannels 20 formed between theroller 17 or the portion of theroller 17 and the overmold 23. Santoprene® is preferably introduced into thechannels 20 at between 200° C. and 230° C., preferably at between 210° C. and 215° C. At this temperature the polypropylene which it comes into contact with will start to melt. - In a preferred embodiment, as can be seen in
FIG. 3 theroller 17 or portion of theroller 17 is formed withintegral channels 20. Thesechannels 20 preferably have aflexible tip 21 which bend when theroller 17 or portion of theroller 17 is placed in theovermold 23 and thetips 21 contact theovermold 23. Theseflexible tips 21 form a seal against theovermold 23 so that when molten Santoprene® is introduced into thechannels 20 it does not leak and therefore forms eventires 9 bounded by thechannel walls 22. - After the Santoprene® has been added to the
overmold 23 it is allowed to cool. Once cooled the formedsupport assembly 5 orportions 18 of thesupport assembly 5 can be removed from theovermold 23. - If the
support assembly 5 is made inportions 18, theportions 18 can be joined together to make acomplete support assembly 5 after overmolding thetires 9. - Alternatively portions of the roller can be joined together to make a
complete roller 17 before overmolding thetires 9 onto it to become asupport assembly 5. - Furthermore, although the invention has been described with reference to a
support assembly 5 for avacuum cleaner 1, the invention is applicable to a rollingsupport assembly 5 for a tool for such acleaner 1. - While the illustrated embodiment shows a
vacuum cleaner 1 in which ducts carry airflow, it will be appreciated that the invention can be applied tovacuum cleaners 1 which carry other fluids, such as water and detergents, as well as other surface-treating appliances.
Claims (20)
1. A method for manufacturing a support assembly or a portion of a support assembly for a surface treating appliance, comprising:
(a) placing a roller or a portion of a roller, made of a first material which has a first melting temperature, into an overmold;
(b) overmolding one or more tires onto the roller or portion of the roller by introducing a second material in a molten state into the overmold;
(c) allowing the second material to solidify; and
(d) separating the support assembly or portion of the support assembly from the overmold,
wherein the second material is introduced into the overmold at a temperature which is higher than the first melting temperature.
2. The method of claim 1 , further comprising:
(x) forming a roller or portion of a roller before performing step (a).
3. The method of claim 2 , wherein in step (x) the roller or portion of the roller is formed by injection molding the first material into the shape of a roller or portion of a roller.
4. The method of claim 1 , 2 or 3 , wherein in step (b) the one or more tires are overmolded onto the roller or portion of the roller by introducing the second material in a molten state into a channel or a plurality of channels formed between the roller or portion of the roller and the over mold.
5. The method of claim 2 , wherein in step (x) the roller or portion of the roller is formed with one or more channels on its outer surface.
6. The method of claim 1 , 2 or 3 , wherein the overmold comprises one or more channels.
7. The method of claim 1 , 2 or 3 , wherein the first material comprises a polymer.
8. The method of claim 7 , wherein the polymer comprises polypropylene.
9. The method of claim 8 wherein the polypropylene comprises a glass filled impact modified copolymer.
10. The method of claim 9 , wherein the glass filled impact modified copolymer is a 20% glass filed impact modified copolymer.
11. The method of claim 7 , wherein in step x) the first material is injection molded at from 230 to 270° C.
12. The method of claim 7 , wherein the one or more tires comprise a thermoplastic elastomer.
13. The method of claim 12 , wherein the thermoplastic elastomer comprises a modified polymer.
14. The method of claim 13 , wherein the modified polymer comprises a mixture of polypropylene and an ethylene propylene diene monomer.
15. The method of claim 12 , wherein the thermoplastic elastomer has a hardness of from 55 to 95 Duro measured on the A scale.
16. The method of claim 15 , wherein the thermoplastic elastomer has a hardness of from 70 to 79 Duro on the A scale.
17. The method of claim 16 , wherein the thermoplastic elastomer has a hardness of from 80 to 95 Duro on the A scale.
18. The method of claim 1 , wherein in step b) the second material is introduced into the overmold at between 200 and 230° C.
19. The method of claim 18 , wherein in step b) the second material is introduced into the overmold at between 210 and 215° C.
20. The method of claim 4 , wherein the overmold comprises one or more channels.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/436,034 US20120187596A1 (en) | 2007-11-23 | 2012-03-30 | Support assembly |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0723027.9 | 2007-11-23 | ||
GB0723027.9A GB2454924B (en) | 2007-11-23 | 2007-11-23 | Support assembly |
US12/276,079 US8646849B2 (en) | 2007-11-23 | 2008-11-21 | Support assembly |
US13/436,034 US20120187596A1 (en) | 2007-11-23 | 2012-03-30 | Support assembly |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/276,079 Division US8646849B2 (en) | 2007-11-23 | 2008-11-21 | Support assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120187596A1 true US20120187596A1 (en) | 2012-07-26 |
Family
ID=38925970
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/276,079 Expired - Fee Related US8646849B2 (en) | 2007-11-23 | 2008-11-21 | Support assembly |
US13/436,034 Abandoned US20120187596A1 (en) | 2007-11-23 | 2012-03-30 | Support assembly |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/276,079 Expired - Fee Related US8646849B2 (en) | 2007-11-23 | 2008-11-21 | Support assembly |
Country Status (6)
Country | Link |
---|---|
US (2) | US8646849B2 (en) |
EP (1) | EP2217121B1 (en) |
JP (1) | JP4985622B2 (en) |
CN (2) | CN101438945B (en) |
GB (1) | GB2454924B (en) |
WO (1) | WO2009066051A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018217407B3 (en) | 2018-10-11 | 2020-01-16 | BSH Hausgeräte GmbH | Roller for a floor cleaning device |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8528166B2 (en) | 2010-04-30 | 2013-09-10 | Techtronic Floor Care Technology Limited | Upright vacuum with floating head |
EP2581014A1 (en) * | 2011-10-12 | 2013-04-17 | Black & Decker Inc. | A vaccum cleaner |
WO2015123538A1 (en) | 2014-02-14 | 2015-08-20 | Techtronic Industries Co. Ltd. | Vacuum cleaner with a separator received within the dirt collection chamber |
US9693665B2 (en) | 2014-10-22 | 2017-07-04 | Techtronic Industries Co. Ltd. | Vacuum cleaner having cyclonic separator |
US10117551B2 (en) | 2014-10-22 | 2018-11-06 | Techtronic Industries Co. Ltd. | Handheld vacuum cleaner |
US9775483B2 (en) | 2014-10-22 | 2017-10-03 | Techtronic Industries Co. Ltd. | Vacuum cleaner having cyclonic separator |
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- 2008-11-07 WO PCT/GB2008/003732 patent/WO2009066051A1/en active Application Filing
- 2008-11-21 US US12/276,079 patent/US8646849B2/en not_active Expired - Fee Related
- 2008-11-24 CN CN2008101818483A patent/CN101438945B/en not_active Expired - Fee Related
- 2008-11-24 CN CN2011100330455A patent/CN102113851A/en active Pending
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US5160474A (en) * | 1990-12-21 | 1992-11-03 | Cadillac Rubber & Plastics, Inc. | Overmolded gasket, heat exchanger tank incorporating the same and method for making the same |
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Also Published As
Publication number | Publication date |
---|---|
JP2009125594A (en) | 2009-06-11 |
WO2009066051A1 (en) | 2009-05-28 |
EP2217121B1 (en) | 2016-04-27 |
CN101438945A (en) | 2009-05-27 |
CN102113851A (en) | 2011-07-06 |
GB0723027D0 (en) | 2008-01-02 |
US20090133210A1 (en) | 2009-05-28 |
JP4985622B2 (en) | 2012-07-25 |
GB2454924B (en) | 2011-12-14 |
GB2454924A (en) | 2009-05-27 |
EP2217121A1 (en) | 2010-08-18 |
CN101438945B (en) | 2012-07-11 |
US8646849B2 (en) | 2014-02-11 |
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Legal Events
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