Abstract:
A suction cleaner nozzle has a nozzle body enclosing an agitator chamber, which has an elongated suction inlet opening. An agitator is disposed in the agitator chamber such that the agitator extends partially through the suction inlet opening for agitating a surface to be cleaned. A duct is connected to the nozzle body and located adjacent the agitator chamber. The duct extends parallel to the rotative axis of the agitator. A turbine rotor is rotatably connected to the nozzle body and operatively connected to the agitator

Description:
RELATED APPLICATIONS  
       [0001]    This application is a continuation application of U.S. Ser. No. 09/556,850 filed on Apr. 21, 2000. 
     
    
     
       BACKGROUND OF THE INVENTION  
         [0002]    1. Field of the Invention  
           [0003]    This invention relates to a vacuum cleaner nozzle. More particularly, this invention relates to a handheld vacuum cleaner nozzle having an improved, nozzle configuration. Even more particularly, this invention pertains to a handheld turbine powered vacuum cleaner nozzle having an improved nozzle configuration. This invention also relates to a turbine powered vacuum cleaner nozzle having a design that facilitates opening and closing of the nozzle housing for cleaning and repair of the nozzle.  
           [0004]    2. Summary of the Prior Art  
           [0005]    Vacuum cleaners are commonly sold with an assortment of handheld attachments, such as crevice tools, upholstery nozzles and dusting brushes, that attach to the end of the suction hose for various cleaning tasks. When cleaning stairs or upholstery with a handheld suction nozzle, a powered agitator greatly improves the cleaning performance of the tool by dislodging dirt and opening up the carpet pile. Handheld carpet and upholstery nozzles are often provided with a rotary agitator powered by an electric motor or by an air turbine located in the suction path. U.S. Pat. Nos. 3,005,224 and 5,351,362 are examples of turbine powered handheld vacuum cleaner nozzles. In each of these references, a drive belt extends from the axle of an air powered turbine rotor to the agitator, whereby the turbine rotor, which is driven by air drawn in though the suction nozzle, drives the agitator.  
           [0006]    Commonly owned U.S. Pat. Nos. 5,513,518 and 6,006,402 each disclose a vacuum cleaner nozzle having an improved suction nozzle configuration that improves the efficiency and cleaning effectiveness of the vacuum cleaner nozzle. The disclosed vacuum cleaner nozzles include specially designed suction ducts extending along the front and/or rear of the agitator chamber. These suction ducts create an airflow within the agitator chamber that is more in harmony with the motion of the rotating agitator than airflow in conventional suction nozzles. As a result, the ducted nozzle captures and directs the dirt drawn into the suction nozzle to the nozzle outlet in a more efficient and effective manner than prior art vacuum cleaner nozzles.  
           [0007]    There is a need in the prior art for a handheld upholstery and stair nozzle that has an improved cleaning effectiveness.  
         SUMMARY OF THE INVENTION  
         [0008]    It is an object of the present invention to provide an improved handheld vacuum cleaner nozzle.  
           [0009]    It is a further object of the present invention to provide an improved turbine powered vacuum cleaner nozzle.  
           [0010]    A further object of the invention is to provide a handheld vacuum cleaner nozzle having an improved suction nozzle configuration.  
           [0011]    Another object of the present invention is to provide a turbine powered hand held vacuum cleaner nozzle having an improved suction nozzle configuration.  
           [0012]    A further object of the present invention is to provide an improved turbine powered vacuum cleaner nozzle that is easy to open and clean.  
           [0013]    These and other objectives will become apparent to one of ordinary skill in the art upon reviewing the attached description and accompanying drawings.  
           [0014]    These and other objectives are achieved by the present invention, which in one form provides 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0015]    The present invention will now be described by way of example, with reference to the attached drawings, of which:  
         [0016]    [0016]FIG. 1 is a perspective view of a vacuum cleaner suction nozzle according to one form of the present invention;  
         [0017]    [0017]FIGS. 2 and 3 are partially exploded plan views of the upper housing assembly of the vacuum cleaner nozzle of FIG. 1;  
         [0018]    [0018]FIG. 4 is a plan view of the upper housing assembly and an exploded plan view of the lower housing assembly;  
         [0019]    [0019]FIGS. 4A and 4B are front and back plan views, respectively, of a latch arm;  
         [0020]    [0020]FIG. 5 is a plan view of the lower housing assembly;  
         [0021]    [0021]FIG. 6 is an exploded cross-sectional view of the agitator assembly;  
         [0022]    [0022]FIGS. 6A and 6B are front and back plan views, respectively, of a rotor retainer;  
         [0023]    [0023]FIG. 7 is a partially exploded partial cross-section of the agitator assembly;  
         [0024]    [0024]FIG. 7A is a front plan view of an agitator tread guard;  
         [0025]    [0025]FIG. 8 is a side view of the vacuum cleaner suction nozzle of FIG. 1, illustrating how the two housing halves are opened and closed;  
         [0026]    [0026]FIG. 8 a  is an enlarged cross-section of portion  8 A of FIG. 8;  
         [0027]    [0027]FIG. 9 is a side view of the suction nozzle of FIG. 1;  
         [0028]    [0028]FIG. 9 a  is an enlarged cross-section of portion  9 A of FIG. 9;  
         [0029]    [0029]FIG. 10 is a partial cross-section taken along line  10 - 10  in FIG. 1; and  
         [0030]    [0030]FIG. 11 is a cross section taken along line  11 - 11  in FIG. 9. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0031]    Referring now to FIGS. 1 through 5, a handheld vacuum cleaner nozzle according one form of the present invention is generally indicated as  1 . The suction nozzle  1  includes a housing formed of an upper housing section  2  and a lower housing section  4  that are releasably joined together in a manner described in further detail below. The upper housing section  2  at least partially encloses an agitator assembly  6 , a turbine rotor assembly  8 , a drive belt  10 , a suction duct/belt guard piece  12 , and a suction tube connector  18  (see FIGS. 2 and 3), forming an upper housing assembly (shown fully assembled in FIG. 4). The lower housing section houses a pair of resilient latch arms  14  and  16  (see FIGS. 4), defining an upper housing assembly (shown fully assembled in FIG. 5).  
         [0032]    The turbine rotor assembly  8 , best illustrated in FIG. 6, is comprised of polycarbonate right and left rotor halves  20  and  22  mounted on a stainless steel rotor axle  24 . A central portion of the rotor axle is knurled, such that when rotor halves  20  and  22  are pressed onto either end of the rotor axle  24 , the knurling non-rotatably retains the rotor halves on the rotor axle. Thrust washers  26  and  28  are mounted on either end of the rotor axle and abut up against the end faces of the rotor. Bearings  30  and  32  are then mounted on either end of the rotor axle  24  and abut up against the thrust washers. Heat and oil resistant polyester rotor retainers  34  and  36  are mounted on each end of the rotor axle, such that cylindrical portions  38  and  40  of the retainers extend over the bearings  30  and  32 . The cylindrical portions  38  and  40  are received in corresponding cylindrical sleeves  42  and  44  formed on the end faces of the rotor, thereby forming labyrinth seals that substantially prevent debris from fouling the bearings. The rotor assembly is secured together by a C-clip  46  attached to a first end of the rotor axle  24  and a sintered iron toothed drive or rotor pulley  48  non-rotatably affixed to the opposite end of the rotor axle.  
         [0033]    The turbine rotor assembly  8  is mounted in the upper housing section  2  by mounting the rotor retainers  34  and  36  within recesses  60  and  62  (see FIG. 2) formed in the top edge of retaining walls  64  and  66  integrally formed with the upper housing section. The retaining walls are captured in peripheral grooves  68  and  70  formed in the rotor retainers  34  and  36 , as shown in FIG. 3. Slots  72  formed in the rotor retainers (see FIG. 6B) receive ridges  78  (see FIG. 2) integrally formed on the retaining walls  64  and  66 , whereby the rotor retainers are prevented from rotating relative to the housing. A pair of nubs  80  are formed on the retaining walls (see FIG. 2) and are located to be receive in a corresponding pair of recesses or through holes  84  (see FIG. 6 a ) formed in the rotor retainers. The nubs form a releasable detent connection with the through holes. With this construction, the turbine rotor assembly is retained in the upper housing half when the lower and upper housing halves are separated, but may be easily removed by an operator for inspection and/or cleaning.  
         [0034]    The agitator assembly  6 , best illustrated in  7 , includes an agitator body  90  having an integrally molded toothed driven or agitator pulley  92 . The agitator body is formed of blown ABS plastic. An agitator axle  94  is formed of two stainless steel shafts press fit into corresponding bores in the ends of the agitator body. Heat and oil resistant polyester thrust washers  96  and  98  are slid over either end of the agitator axle, followed by sintered bronze bearings  100  and  102 . Thread guards  104  and  106  are then attached to either ends of the agitator axle  94 . The thread guards include inner cylindrical sleeves  110  that extend over the bearings  100  and  102  into annular cavities  116  formed in the ends of the agitator body. Thread guards  104  and  106  also include outer cylindrical sleeves  118  that extend over the outer ends of the agitator body. Thus, the inner and outer annular sleeves cooperate with the ends of the agitator body to form labyrinth seals that substantially prevent threads and other debris from fouling the bearings  100  and  102 . A pair of grooves  122  (see FIG. 7 a ) is formed in the outer end face of each of the thread guards  104  and  106 . The rotor assembly is mounted in the upper housing section  2  with ridges  130  integrally formed in the upper housing section (see FIG. 2) slidably received in the grooves  122  in the thread guards. Thus the thread guards are non-rotatably mounted in the upper housing section.  
         [0035]    The toothed drive belt  10  extends between the rotor pulley  48  and the agitator pulley  92 . The drive belt is mounted upon the agitator pulley prior to insertion of the agitator assembly into the upper housing section  2 . After insertion of the agitator assembly and the drive belt into the upper housing section, as illustrated in FIG. 3, the belt guard/suction duct piece  12  is securely attached to the upper housing section  2  using two screws  140  and  142 , as shown in FIG. 4. Belt guard portion  144  extends over the agitator belt and the agitator pulley. The belt guard covers the agitator pulley and drive belt in the agitator chamber, and thereby substantially prevents hair and other debris from fouling the agitator pulley  92 . The belt guard also retains the agitator assembly  6  within the upper housing section, thereby preventing the agitator assembly from falling out of the upper housing section when the housing is opened. The turbine rotor assembly  8  is then mounted in the upper housing section and the drive belt is looped over the rotor pulley  48 . The upper housing assembly is completed by attaching the suction tube connector  18  using two screws  148  and  150 , as shown in FIG. 4.  
         [0036]    The lower housing assembly, illustrated in FIGS. 4 and 5, includes the lower housing section  4  and the resilient latch arms  14  and  16 . The resilient latch arms have inner ends  152  with catches  156  and  158  integrally formed therewith that permanently snap into the lower housing as shown in FIG. 5. The latch arms also include integrally formed finger buttons  160  and  162  and latch fingers  164  and  166 . The latch arms are formed of any suitable resilient material, such as Acetal. The latch arms yield in cantilever fashion about their inner ends  152  and  154  when the finger buttons  160  and  162  are depressed and spring back to their original position when the finger buttons are released.  
         [0037]    A suction inlet opening  168  is formed in the lower housing section. The suction inlet opening opens into the agitator chamber. When the two housing sections are assembled, the bristles on the agitator extend through the suction inlet opening for agitating a surface being cleaned.  
         [0038]    The upper and lower housing assemblies are assembled together by first inserting tabs  170 ,  172 ,  174 , and  176  integrally formed on a front edge of the lower housing section  4  (see FIG. 4) into corresponding slots  178 ,  180 ,  182 , and  184  formed in the front edge of the upper housing section  2  (see FIG. 4), as shown in FIGS. 8 and 8 a.  The upper and lower housing sections are then pivoted toward to each other, as indicated by arrow A in FIG. 8, and pressed together, as illustrated in FIG. 9, until the latch fingers  164  and  166  on the latch arms  16  and  14  cam over and latch onto catches  190  and  192  (see FIG. 3) integrally formed on the connector  18 . The two housing sections are thereby securely latched together. At least one of the latch fingers and the catches are preferably chamfered, in order to facilitate the camming of the latch fingers over the catches when the housing sections are pressed together.  
         [0039]    The upper and lower housings are easily separated for inspection, cleaning, and repair of the nozzle simply by depressing the finger buttons  160  and  162  by squeezing the finger buttons between the thumb and a finger of a single hand, while holding the upper housing section  2  in the other hand, and pulling the two housing sections apart. Thus, the present invention provides a very simple and convenient operation, i.e. squeeze and pull, by which the upper  2  and lower  4  housing sections may be separated. When the two housing sections are separated, the turbine rotor assembly  8  and the agitator assembly  6  are retained in the upper housing section, as previously described. The rotor may be easily removed simply by pulling on the rotor  23  with sufficient force to overcome the detent connection between the nubs  80  and the through holes  84 . If necessary, the agitator and/or the drive belt may be removed by removing screws  140  and  142 , removing the belt guard suction/suction duct piece  12 , and removing the agitator assembly  6  from the upper housing.  
         [0040]    During operation, the suction nozzle  1  is attached to a suction wand or the end of a suction hose of a vacuum cleaner via connector  18 . The suction created by the vacuum cleaner draws air in through the suction inlet opening  168 , through the agitator chamber, through an agitator outlet  194  into contact with a turbine rotor  23  and out the discharge port or connector  18 . The agitator outlet  194  (see FIGS. 3, 4, and  8 ) is a tapered channel integrally formed with the suction duct/belt guard piece  12 . The agitator outlet is shaped, oriented and located to direct a jet of air at the center of the turbine blades on the rotor  23 . The jet of air is directed substantially tangent to the rotor, in order to rotate the rotor. For maximum efficiency and power, the jet of air is directed into a conventional turbine inlet volute  196  (see FIG. 5) defined by walls  197 ,  198  and  199  integrally molded with the lower housing section  4 . As the turbine rotor rotates, the drive belt  10  drives the agitator.  
         [0041]    To further maximize performance of the nozzle, the retaining walls  64  and  66  on the upper housing section at least partially overlap with corresponding walls integrally molded into the lower housing section  4 . The overlapping walls form labyrinth seals that minimize leakage of air into the turbine chamber and thereby maximize the amount of air entering the suction inlet  168  for picking up dirt and passing through the agitator outlet  194  for driving the rotor  23 .  
         [0042]    Best seen in FIGS. 10 and 11, belt guard/suction duct piece  12  forms a sidewardly extending duct  200  along the rear edge of the agitator chamber  202  and adjacent to the rear edge of the suction inlet opening  168 . As viewed in FIG. 10, the sidewardly extending duct  200  is defined by an inner vertically extending wall  204 , an outer vertically extending wall  206 , an upper wall  208  and a lower wall  210 . The lower wall  210  is spaced from the lower edge of the inner vertical wall  204  defining a suction slot  212  there between. The lower wall  210  extends inwardly of the inner vertical wall  204  forming a ledge  214  in the agitator chamber for capture of debris thereon. The central portion of the inner vertically extending wall  204  preferably has a recess or cut-out  216  (see FIG. 3) formed in the lower edge thereof opposite the agitator outlet  194 . The recess or cutout provides an area through which large dirt and debris, that would otherwise jam in the relatively narrow suction slot  212 , may pass through.  
         [0043]    In operation, a majority of the dirt and debris picked up by the agitator (as illustrated by arrow B in FIG. 10) is thrown substantially horizontally by the agitator directly through the suction slot  212  and into the sidewardly extending duct  200 . The dirt then travels along the sidewardly extending duct to the agitator outlet  194 . As best seen in FIG. 11, the sidewardly extending duct has an expanding cross-sectional area approaching the agitator chamber outlet  194 . The expanding cross-sectional area of the sidewardly extending duct is designed to provide a substantially constant airflow characteristic across the suction slot  212 . Thus, the rate of air flowing from the agitator chamber, through the suction slot and into the sidewardly extending duct is substantially constant across the width of the nozzle. As a result, the airflow in the agitator chamber is in the same direction that the dirt is substantially thrown by the agitator i.e. along arrow B, as opposed to a conventional suction nozzle that has a large lengthwise component to the airflow in the agitator chamber, i.e. into or out of the paper in FIG. 10.  
         [0044]    It will be appreciated by one of ordinary skill in the art that a pair of sidewardly extending ducts, namely one located along the front edge of the agitator chamber (not shown) and one located along the rear edge of the agitator chamber may be provide. U.S. Pat. Nos. 6,006,402 and 5,513,418, the disclosures of which are hereby incorporated herein as reference, disclose such a dual duct nozzle configuration. Similarly, it will be appreciated the sidewardly extending duct may alternatively be provided only along the front edge of the agitator chamber. When a sidewardly extending duct is provided along the front edge of the agitator chamber  202 , a communicating passageway (not shown) must be provided that extends over the agitator cavity into communication with the agitator outlet  194 , as disclosed and previously incorporated U.S. Pat. Nos. 5,513,418 and 6,006,402.  
         [0045]    The materials set forth above for various parts of the nozzle  1  are provided as examples of suitable materials for these parts, in order to provide a complete and enabling disclosure of the invention. One of skill in the art will appreciate that other suitable materials may be used in place of the specific materials disclosed above, without affecting the performance or utility of the disclosed invention. As such, all the materials disclosed above for different parts of the disclosed device are intended as examples of suitable materials only, and are not intended to limit the invention to any such specifically disclosed material.  
         [0046]    The invention has been described, by way of example above, with reference to one form of the invention. Various modifications and alternate embodiments will be apparent to one of ordinary skill in the art upon reviewing the proceeding description and accompanying drawings. The present invention is intended to be limited only by the attached claims and not by the detailed description of one form of the present invention provided by way of example above.