Abstract:
A vacuum cleaner generally has a working head which is positioned on the floor surface when the machine is in use. The working head of a vacuum cleaner essentially includes a rotating brush, a suction blower and a motor for operating both the brush and the blower. In addition, this working head also generally requires a spacing device, such as a wheel for guiding the brush head or suction brush head and controlling its proper spacing in relation to the floor.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is a continuation in part of pending application Ser. No. 07/747,185, entitled &#34;Brush Type Vacuum Cleaner&#34;, which was filed on Aug. 19, 1991 in the names of Klaus Stein and Heinz Kaulig, the inventors herein, which application is incorporated by reference herein. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to floor care machines, such as vacuum cleaners, which have a working head which is positioned on the floor surface when the machine is in use. The working head of a vacuum cleaner generally includes a rotating brush, a suction blower and a motor for operating both the brush and the blower. In addition, this working head also generally requires a spacing device, such as a wheel for guiding the vacuum cleaner and controlling the proper spacing between the working head and the floor. 
     2. Background Information 
     With the vacuum cleaner of the present invention, one motor is provided for operating the suction blower as well as the cleaning brush. The cleaning brush is driven simultaneously with the suction blower by means of additional drive devices such as drive belts. Since all of the heaviest components of the vacuum cleaner are mounted in the brush-suction head which rolls along the ground, the load that the user experiences may be kept particularly low. 
     On the other hand, this configuration therefore results in a heavier brush-suction head, which brush suction head is generally guided along the floor on a set of wheels. The wheels also generally provide the spacing between the brush-suction head and the floor so that a proper brushing of the floor is achieved. That is, depending on the height or pile of the carpet, the height between the brushes and the carpet can be adjusted so that the brushes contact the carpet with sufficient brushing action as the brushes rotate. 
     Wheels for such a vacuum cleaner also generally need to make it possible for the machine to be moved back and forth on the floor relatively easily. Typically, the wheels are made of a hard material, such as metal or hard plastic, and these types of wheels have significant disadvantages, particularly when they are run over hard floors, in particular stone floors with joints and seams. As such a device with hard wheels is run over joints or seams in hard floor, hard impacts are transmitted to the device, and these impacts generally result in relatively loud noises. 
     To achieve damping or suspension effects, of course, the prior art has equipped such machines with wheels which support a soft and elastic tire about the circumference of the wheels. However, it has been shown that satisfactory results can only be achieved with such a soft and elastic tire if the tire is relatively soft and thick. These soft and thick tire arrangements, however, result in excess wear of the tire, resulting in the frequent need for tire replacement, and the machine leaves streaks on the floor. Further, if the machine is allowed to sit idle for a long period of time, that is, with the same portion of the tire in continuous contact with the floor, permanent deformations of the tire occur, and these permanent deformations in turn, cause noisy and bumpy operation of the machine. 
     These disadvantages can of course be eliminated by a wear-resistant tire material which also resists permanent deformations. But, with such a wear-resistant tire arrangement, the tire cannot be sufficiently elastic, and therefore, when the tire is in contact over its entire surface with the roll body, or hub, the damping effect of the tire is very small. 
     OBJECT OF THE INVENTION 
     The object of the invention is to create a floor care machine, such as a vacuum cleaner, which has a wheel of the generic type described above, which, by means of simple measures, makes possible a sufficient degree of damping using wear resistant materials, guarantees good functionality by making possible damped travel on hard floors, and does not leave streaks on any floors. 
     SUMMARY OF THE INVENTION 
     This object is achieved by means of the invention, in a floor care machine, or vacuum cleaner, which has a wheel in which a portion of the cylindrical surface of the roll body of the wheel is formed by a tire made of wear-resistant elastic material as a projecting running surface, and which elastic material is held in place in a groove-shaped seat of the roll body. Underneath the tire, the groove-shaped seat has a deflection space into which the tire can deflect upon impact, and the running surface of the tire is formed by a raised, projecting cylindrical surface. 
     It thereby becomes possible for the tire to deflect into the deflection space located underneath the tires bottom surface, so that the above-mentioned conditions with regard to damping, wear, functionality and streaking, can be met. 
     In a simple embodiment for mounting the tire, the groove-shaped seat is preferably indented in a stepped fashion. 
     The invention also proposes that the roll body be formed preferably by two partial elements which are assembled together by means of spokes and/or tabs. 
     One aspect of the invention resides broadly in a vacuum cleaner for vacuuming an object such as a floor. The vacuum cleaner comprises: a housing having a first end and a second end. The first end of the housing comprises a floor suction component, and the floor suction component comprises: suction apparatus for withdrawing at least air from the vicinity of the floor, an outlet for emitting the withdrawn air from the floor suction component, a rotating brush device for dislodging dirt and the like from the floor, and at least one wheel device for movement of the housing along the floor. The second end of the housing comprises a filter housing, and the filter housing comprises: a filter apparatus for filtering at least the air withdrawn by the suction apparatus, and a device for connecting the suction apparatus to the filter apparatus. The at least one wheel device comprises a wheel body, and the wheel body has a surface about the circumference of the wheel body. The wheel body comprises: a circumferential groove disposed about the circumference, the circumferential groove having a base and a top, and an elastomeric tire at least partially disposed within the circumferential groove, the elastomeric tire having a base portion disposed toward the base of the circumferential groove, and a protruding portion for protruding beyond the circumference of the wheel body. The base portion of the tire is spaced apart from the base portion of the circumferential groove. 
     Another aspect of the invention resides broadly in a floor care machine such as a vacuum cleaner, the floor care machine comprising: a housing having a first end and a second end. The first end of the housing comprises a working head, and the working head comprises: at least one wheel device for movement of the housing along the floor, and at least one of: suction device for withdrawing at least air from the vicinity of the floor; a device for dislodging dirt and the like from the floor; and a brush device for polishing the floor. The second end of the housing comprises a handle device for guiding the floor care machine along the floor. The at least one wheel device comprises a wheel body, and the wheel body has a surface about the circumference of the wheel body. The wheel body comprises: a circumferential groove disposed about the circumference, the circumferential groove having a base and a top, and an elastomeric tire at least partially disposed within the circumferential groove, the elastomeric tire having a base portion disposed toward the base of the circumferential groove, and a protruding portion for protruding beyond the circumference of the wheel body. The base portion of the tire is spaced apart from the base portion of the circumferential groove. 
     One additional aspect of the invention resides broadly in a wheel for use in a floor care machine. The wheel comprises: a wheel body, and the wheel body has a surface about the circumference of the wheel body. The wheel body comprises: a circumferential groove disposed about the circumference, the circumferential groove having a base and a top, and an elastomeric tire at least partially disposed within the circumferential groove, the elastomeric tire having a base portion disposed toward the base of the circumferential groove and a protruding portion for protruding beyond the circumference of the wheel body. The base portion of the tire is spaced apart from the base of the circumferential groove. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     One embodiment of the invention is schematically illustrated in the accompanying drawings, in which: 
     FIG. 1A is a perspective view of a brush-type vacuum cleaner of the present invention; 
     FIG. 1B is a perspective view of the brush-suction head of the vacuum cleaner of FIG. 1A; 
     FIG. 1C is a cut-away bottom view of the brush-suction head of the vacuum cleaner of FIG. 1A; 
     FIG. 1 shows a side view of a wheel for the brush-suction head of the vacuum cleaner; 
     FIG. 2 shows a cross section taken along Line II--II in FIG. 1; and 
     FIG. 3 shows a cross section taken along Line III--III in FIG. 1. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIGS. 1A-1C show a brush-type vacuum cleaner 1&#39; a the individual elements comprising the vacuum cleaner 1&#39;. Vacuum cleaner 1&#39; includes filter housing 2&#39; and brush-suction head 3&#39;. Brush-suction head 3&#39; may be replaced by a non-brush type suction head. Filter housing 2&#39; is equipped with a handle comprising shaft 4&#39; and grip 5&#39;. Filter housing 2&#39; may also include an air filter such as a filter bag. Brush-suction head 3&#39; includes a motor that drives the suction blower and, also, simultaneously drives a cleaning brush by means of drive belts. Such filter bags, motors, cleaning brushes and drive belts are well known in the art. Filter housing 2&#39; and brush-suction head 3&#39; are connected to one another by means of a pivoting connection such as connector, or guide element 8&#39;. 
     With brush-type vacuum cleaner 1&#39;, the suction air generated may travel from the vacuum mouthpiece of brush-suction head 3&#39; and into filter housing 2&#39; via channel 6&#39;. Channel 6&#39; may act as an inlet line for the dirt-laden suction air. From filter housing 2&#39;, the air may travel via channel 7&#39;, wherein channel 7&#39; may be parallel to channel 6&#39;, and back to brush-suction head 3&#39;. 
     Brush-suction head 3&#39; is equipped with connector 8&#39;, which connector 8&#39; facilitates the pivoting of filter housing 2&#39; with brush-suction head 3&#39;. Connector 8&#39; is mounted so that it can pivot in brush-suction head 3&#39; such as in a corresponding receptacle that may form a part of brush-suction head 3&#39;. Connector 8&#39; contains outward-leading channels 6&#39; and 7&#39;, wherein channels 6&#39; and 7&#39; may be parallel to one another. The ends of channels 6&#39; and 7&#39; form an attachment for the mounting of filter housing 2&#39; with coordinated continuing channels in filter housing 2&#39; and/or brush-suction head 3&#39;. 
     Brush-suction head 3&#39; is equipped in the connection area with diagonally running guide 10&#39; which is alignable with a corresponding receptacle 11&#39; of filter housing 2&#39;. Guide 10&#39; may define a curved surface or a partially circular surface. The connection of connector 8&#39; to the filter housing 2&#39; is maintained via a locking element (not shown) which can be released by a corresponding release button 12&#39; on filter housing 2&#39;. 
     A possible location for the releasable connection of an electrical lead from filter housing 2&#39; to brush-suction head 3&#39; is the vicinity adjacent attachment, or guide element or connector 8&#39;. This connection may be a standard and well known type of electrical connection. 
     In the vicinity of brush-suction head 3&#39; and inside attachment, or guide element or connector, 8&#39;, channel 7&#39; is for being connected with the suction blower (not shown). Channel 6&#39; is for being connected with vacuum mouthpiece 19&#39; of brush-suction head 3&#39;. 
     By means of this double channel connection between filter housing 2&#39; and brush-suction head 3&#39;, a mechanical coupling is created which also ensures a separate air conduction independent of the pivot position. 
     As shown in FIG. 1C, the brush-suction head of the vacuum cleaner preferably has a brush roller 9&#39; which is connected via belt 13&#39; to a motor shaft 14&#39; of a motor 18&#39;. The motor shaft 14&#39; can also directly drive a suction blower 15&#39; to suck air in through vacuum mouthpiece 19&#39;. 
     In addition, the brush-suction head 3&#39; can also preferably have four wheels to carry and guide the brush suction 3&#39; head over the surface being cleaned. Two front wheels 16&#39; and two rear wheels 17&#39;. The two front wheels 16&#39; can be an integral part of the brush roller 9&#39; or they can be separate therefrom, and generally are adjustable relative to the floor to vary the height between the brush roller 9&#39; and floor being cleaned. The back wheels 17&#39; are generally fixed with respect to the brush suction head 3&#39;, but depending on the desired operation of any floor care machine, the back wheels can also be adjustable to vary the height between the floor and the brush suction head 3&#39; at the back end of the brush-suction head 3&#39;. 
     These wheels are described in greater detail with reference to FIGS. 1-3. In FIGS. 1-3, the illustrated wheel has a hub 2, and preferably consists of two assembled matching partial wheel elements 3 and 4 which, when assembled, form a roll body 5. The partial wheel elements 3 and 4 are preferably connected to one another by means of spokes 6 and tabs 7. 
     In the plane separating the partial wheel elements 3 and 4, there is preferably a groove-shaped seat 8 for receipt of an elastic tire 9. Underneath the bottom surface 11 of the tire 9, there is preferably a deflection space 10. In the embodiment shown, the groove-shaped seat 8 preferably has a stepped indentation 12 to hold the tire 9, and the tire 9 is also preferably correspondingly indented to thereby match the indentation 12. The roll surface 14 of the tire 9 also preferably projects beyond the roll surface 13 of the roll body 5, and thereby forms a preferably raised, rounded cylindrical surface. The size of this projection can be designed so that edges or doorsills in the floor preferably do not strike the hard roll body 5. 
     As a result of this embodiment according to the present invention, it is possible to achieve a high damping effect with the use of a tire material that is characterized by low wear and high recovery. This is essentially the case since, as a result of the deflection space 10, the base surface 11 of the tire 9 is not in contact with anything and therefore can undergo unobstructed deflection into the space 10. 
     While the present invention has been disclosed with respect to a brush type vacuum cleaner, it is to be understood that the present invention is equally usable in non-brush type vacuum cleaners, also. 
     In summary, one feature of the invention resides broadly in a wheel for floor care machines, in particular for brush vacuum cleaners, to guide the brush head or suction brush head and/or to keep it at the proper distance in relation to the floor. The wheel consists of a wheel body with a hub, characterized by the fact that a portion of the cylindrical surface of the roll body 5 is formed by a tire 9 made of elastic material as the projecting running surface, and is held in a groove-shaped seat 8 of the roll body 5, whereby underneath the installed tire 9 the groove-like seat has a deflection space 10, and the running surface of the tire 9 is formed by a raised projecting cylindrical surface. 
     Another feature of the invention resides broadly in a wheel characterized by the fact that the groove-shaped seat 8 is indented in a stepped fashion. 
     Yet another feature of the invention resides broadly in a wheel characterized by the fact that the roll body 5 is formed by two partial wheel elements 3 and 4 which are assembled by means of spokes 6 and/or tabs 7. 
     All, or substantially all, of the components and methods of the various embodiments may be used with at least one embodiment or all of the embodiments, if any, described herein. 
     All of the patents, patent applications and publications recited herein, if any, are hereby incorporated by reference as if set forth in their entirety herein. 
     The details in the patents, patent applications and publications may be considered to be incorporable, at applicant&#39;s option, into the claims during prosecution as further limitations in the claims to patentably distinguish any amended claims from any applied prior art. 
     The appended drawings, in their entirety, including all dimensions, proportions and/or shapes in at least one embodiment of the invention, are, if applicable, accurate and to scale and are hereby incorporated by reference into this specification. 
     The invention as described hereinabove in the context of the preferred embodiments is not to be taken as limited to all of the provided details thereof, since modifications and variations thereof may be made without departing from the spirit and scope of the invention.