Abstract:
A portable air purifier for purifying air in selected occupied spaces, comprising a base for attaching to a support in the space, a housing pivotally mounted to the base, a fan mounted within the housing and having an air inlet and an air outlet for communicating air through the housing and at least one air treatment device supported in the housing for acting upon air communicated by the fan.

Description:
TECHNICAL FIELD  
       [0001]     The present invention relates to air purifiers. More particularly, the present invention relates to portable air purifiers for purifying air in selected spaces.  
       BACKGROUND OF THE INVENTION  
       [0002]     In recent years, attention has increasingly been directed to the quality of air breathed by persons in homes, offices, restaurants, hotels, and the like. This attention derives from the perception that airborne dust, allergens, and microorganisms such as germs and bacteria, affect the health of persons breathing the air. Often HVAC systems seek to exchange exterior air as fresh with air contained within an interior space. Notwithstanding the mix of a proportion of exterior air with interior air, increases in odors, dust and airborne particulates, and microorganisms, can become quite concentrated in interior spaces. Even the introduction of exterior air however does not necessarily reduce such airborne materials as exterior air often includes pollen, dust, dirt, and airborne pollutants.  
         [0003]     A variety of devices have been provided for treatment of air in interior spaces. These include filtration devices such as particulates filters that remove larger particles from the air, electrostatic filters that trap particles sensitive to electrostatic charges and odor filters that remove odors or scent the air. Odor filters include activated carbon or charcoal that remove pollutants primarily by absorption as well as fragrancing media to provide a pleasant odor. Some air purifier devices that include filtration mechanisms also include additional air purification features. These include UV quartz lights for destroying germs and pathogens carried in the air as well as generate ozone. Other devices generate positive or negative ions. The ions emitted into the air tend to electrostatically cling to pollutants having opposing charges. The attached ions increase the weight of the air-born particles and cause the particles to fall to the ground, thereby clearing the air of dust and other pollutants.  
         [0004]     While various devices have been provided for interior spaces of homes and office buildings, there are other semi-enclosed environments occupied by persons which raise concerns as to the quality of the air in the environment. For example, motor vehicles generally have small enclosed cabs for occupancy by a driver and passengers. Many motor vehicles today have selective settings for operation of the HVAC system. A first setting enables the driver to primarily recirculate air within the compartment. This facilitates a more rapid change in temperature by continued heating or cooling of the air within the compartment. A second operating mode communicates exterior air into the cab for mixing with interior air. In many motor vehicles available today, the exterior air passes through a particulate filter to remove larger particles from the exterior air communicated into the cab. Notwithstanding the recirculation mode of operation, there is generally always some exterior air communicated into the interior of the cab, with concurrent outflow of air from the interior of the cab. While such particulate filtering of exterior air reduces the larger particulates in the cab, this does not readily purify the air within the cab. For long trips or for persons traveling with someone who is smoking, the air can become uncomfortable for breathing.  
         [0005]     Further, the spaces using these devices for purifying air are generally occupied by persons lacking operational control or authority over the purification device. A purification device that is not working properly, that requires routine but unprovided maintenance, or is not effective as to particular contaminants, particulates, bio-organisms, or other air-borne material, may be at best counter-productive by creating merely an appearance of purification activity.  
         [0006]     Accordingly, a need remains in the art for a portable air purifier selectively operational by an occupant of a space for purifying air. It is to the provision of such that the present invention is directed.  
       SUMMARY OF THE INVENTION  
       [0007]     The present invention meets the need in the art by providing a portable air purifier useful for purifying air in closed spaces. The air purifier comprises a housing that connects by a base to a support surface of a closed space. The housing includes a fan having an air inlet and an air outlet for communicating air through the housing. The housing includes purification devices for treating air communicated by the fan through the housing.  
         [0008]     Objects, features, and advantages of the present invention will become apparent upon a reading of the following detailed description in conjunction with the drawings and the appended claims. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0009]      FIG. 1  is a perspective partial view of an interior of a motor vehicle having an air purifier according to the present invention mounted to a dashboard of the motor vehicle.  
         [0010]      FIG. 2  is an exploded perspective view of the air purification device illustrated in  FIG. 1 . 
     
    
     DETAILED DESCRIPTION  
       [0011]     With reference to the drawings, in which like parts have like identifiers,  FIG. 1  illustrates in perspective detailed view an air purifier  10  useful selectively in closed spaces for purifying air (such as the illustrated mounting of air purifier to a dashboard  12  of a motor vehicle  14  for treating air within the interior generally  16  of the motor vehicle).  
         [0012]      FIG. 2  illustrates in exploded perspective view the air purifier  10  according to the present invention. The air purifier  10  includes a base  20  having a pair of raised portions  22  relative to a recessed or valley portion  24 . The raised portions each include a face  26  disposed at an oblique angle relative to a longitudinal axis extending between an outlet side  28  and an inlet side  30  of the base  20 . A lip  32  extends laterally from the raised portion  22  outwardly from the face  26  over the valley portion  24 . The lip  32  cooperates with the face  26  to define a slotted recess  34 . A flexible tongue  36  extends from the valley portion to have a free distal end towards the outlet side  28 . The valley portion  24  further defines a pair of opposing openings  38  for receiving fasteners to selectively attach the base  20  to the dashboard  12  of the motor vehicle  14 .  
         [0013]     A wire stand generally  42  includes opposing base members  44  extending from an apex  46 . The base members  44  are disposed at a relative angle that conforms to the angle of the faces  26  in the raised portions  22 . Distal arms  48  extend away from the base  20  at an oblique angle relative to a plane passing through the base members  44  of the wire stand  42 . The wire stand  42  attaches to the base  20  by positioning the base members  44  in the opposing slotted recesses  34 . The tongue  36  engages the apex  46  to latch the wire stand to the base  20 .  
         [0014]     The air purifier  10  includes a housing  50  made of a bottom  52  and an opposing top  54 . The bottom  52  has a dish-shape that defines a bottom with upstanding sidewalls. Opposing sidewalls define notches  56 . An outlet side of the bottom has opposing plates  58 . The bottom also defines an opening  60  for power leads.  FIG. 1  illustrates a power lead  61  having an adaptor  63  for connecting a circuit board  62  to a power outlet in the motor vehicle.  
         [0015]     The circuit board  62  mounts to the top  54 . An ionization needle  64  attaches to operating circuitry on the circuit board  62 . A lamp socket  66  connects to the circuit board. The lamp socket  66  receives a ultraviolet bulb  68 . A photocatalytic screen  70  mounts to the circuit board  62  in over-wrapping spaced-apart relation to the bulb  68 . A purification plate  72  attaches to the circuit board  62  in spaced-apart relation to the UV bulb  68 . The purification plate  72  includes a non-electrically-conductive substrate or plate with conductive members on opposing sides that communicate with a supply of electrical current.  
         [0016]     The purification plate provides a corona discharge device for generating ozone, such as part TF347 available from TT Electronics IRC—Advanced Film Division, Corpus Christi, Tex. That purification plate includes a ceramic substrate with a glass coating on opposing major sides and a electrical conductor material (tungsten-based) printed as patches on the surface of the glass coating on the opposing sides. The electrical conductor material is selected for being resistant to corrosion by ozone. The opposing patches connect to a supply of electrical current. Copper patches are applied to the opposing sides to provide a solderable connection for leads and supports connecting the plate to the circuit board. While the patches may be of consistent size, the patch printed on the side exposed to the airflow in the air purifier  10  is smaller in area that the patch on the opposing side, whereby the corona discharge is forced to the side exposed to the air flow.  
         [0017]     The circuit board  62  defines a notched opening that matingly receives a fan housing  74 . The fan housing includes a fan operated by a motor for communicating air from an air inlet to an air outlet. The top  54  of the housing  50  defines an air intake grill generally  76  at an intake side of the air purifier  10 .  
         [0018]     Opposing sides of the top define laterally protruding supports  78 . Each support  78  includes a threaded opening that receives a threaded insert  80  extending from a knob  86 . An annular ring  82  defines an opening through which the insert extends. An interior face of the ring  82  defines an elongate slot  84  which receives a respective one of the arms  48 , as discussed below. The rings  82  allow the housing to pivot towards and away from the dashboard for selectively orienting the outflow air. The knob  86  selectively rotates in a first direction to tighten the ring  82  against an exterior face of the support  78  and rotates in an opposite direction to loosen the ring relative to the support. Tightening the knob causes the ring to bear tightly against the arm  48  in the slot  84 . This secures the housing  50  in a selected angled position relative to the base  20 .  
         [0019]     With reference to  FIG. 1 , the base  20  mounts to the dashboard  12  with fasteners, such as screws, through the openings in the valley portion  24  of the base. The base  20  can alternatively be detachably attached to the dashboard with adhesive-backed hook and loop fabric connectors, such as VELCRO fastener tape, or can be secured by other fasteners, such as suction cups to smooth surface or glass or with screws or other fasteners.  
         [0020]     In the illustrated embodiment, the base members  44  of the wire stand  42  are moved angularly towards each other relative to the apex in order to receive the base members  44  in the opposing slotted recess  34  of the base  20 . The free arms  48  attach to the housing  50 . This is accomplished by passing the free distal end of the arms  48  into the slots  84  in the rings  82 . The housing  50  is positioned with respect to the base to direct the air outflow in a selected direction into the interior of the motor vehicle. The opposing knobs  86  are rotated to tighten the rings  82  against the support and thereby fix the housing  50  in the selected orientation.  
         [0021]     The air purifier  10  of the present invention operates selectively by a user within a space occupied by the user, for example, the interior  16  of the motor vehicle  14 , to purify the air. The electrical lead  61  attaches to a supply of electrical current, such as an adapter socket or cigarette lighter outlet commonly found in motor vehicles. In an alternate embodiment in which the air purifier  10  is incorporated into an HVAC system of a motor vehicle, the electrical leads for the power supply include connectors for attaching to a wiring harness or other appropriate source of current in the motor vehicle. An alternate embodiment of the air purifier includes a socket that connects to an electrical plug from an A/C electrical current adapter, whereby the air purifier  10  is readily transported by a user from a motor vehicle to a selected use location, such as a hotel room, closet, laundry room, office, kitchen, or other space having need for purification of air.  
         [0022]     The air purifier  10  includes a switching device for controlling the airflow through for the air purifier. The switching device comprises fan speed up and down control buttons  90 ,  92  for increasing the fan speed to a maximum or decreasing to zero fan speed, or alternatively, a slide switch for varying the fan speed. In addition, purification level up and down buttons  94 ,  96  enable selective ozone generation between off or none and a maximum. LED&#39;s  98 ,  100  provide a visual indication of the operational settings.  
         [0023]     During operation of the air purifier  10 , the fan operates to pull air into the air purifier  10  through the air intake grill  76  and blow treated air out through the outlet. The UV bulb  68  is activated. Current is also supplied to the opposing sides of the purification plate  72 .  
         [0024]     The air flows through the air intake grill  76  and through the photocatalytic screen  70 . This exposes the air to the UV bulb. The UV light destroys pathogens and other biological organisms carried in the airflow. The UV light  68  activates the photocatalytic screen  70 . The screen  70  generates hydroxyl radicals. These short-lived radicals react with and neutralize volatile organic compounds in the airflow. The photocatalytic screen  70  may be titanium oxide or other suitable metallic alloy material for generating hydroxyl radicals through exposure to UV light, such as parts RCIC-5A, -9A, -9C, -9HOA, -9HOC, -11HOA, -11C, -14C, -14HOA, -14HOC, -36/5A, -36HOA, and -36UVA available from RGF Environmental Group, Inc. of West Palm Beach, Fla.  
         [0025]     The purification plate  72 , subjected to high voltage between the opposing printed sides, shorts and sparks to create-ozone which provides for purification of the air. The illustrated embodiment disposes the side of the purification plate having the relatively smaller electrical patch to the air flow. The smaller electrical patch forces the corona discharge to the side in the air flow. Because the air purifier  10  includes the purification plate  72  for generating ozone, the UV lamp  68  can be made of a non-quartz glass. In an alternate embodiment lacking the purification plate  72 , the UV lamp  68  can be made of quartz glass to generate ozone.  
         [0026]     The ion needle emits a plurality of negative ions into the airflow. The treated air flows through the gap between the two plates  58  and out of the outlet end of the air purifier  10 . The negative ions attach to particulates in the air flow and in the space occupied by the user. The heavier particulates fall out of the air. The air is thereby treated to provide air within the passenger compartment (or other selected space) having reduced contaminants.  
         [0027]     The present invention accordingly provides an air purifier readily portable for purifying air within close spaces, such as motor vehicles, hotel room, laundry room, and the like. While the invention is described with respect to mounting to a dashboard of a motor vehicle for purifying air, such is not restrictive but merely illustrative of one closed space gainfully benefited by the present invention. Indeed, the principles, preferred embodiments, and modes of operation of the present invention have been described in the foregoing specification. The invention is not to be construed as limited to the particular forms disclosed, as these are regarded as illustrative rather than restrictive. Moreover, variations and changes may be made by those skilled in the art without departing from the spirit of the invention described in the following claims.