Abstract:
An aromatic odor neutralizer includes a vaporization chamber containing a wick with an end part immersed in fluid in a storage cup that is gravity fed from an airtight vessel by the use of air pathways exposed when the liquid level in the cup is reduced. The vaporization chamber is located in a dispenser housing with an internal passage between end walls and communicating with vents in the sides for aerodynamic airflow to efficiently absorb vapors from a vaporizer chamber.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation-in-part of application Ser. No. 11/805,662, filed May 24, 2007. This application is related to design application Ser. No. 29/288,033, filed May 24, 2007 entitled A vaporizer for an aromatic odor neutralizer and design application Ser. No. 29/288,034, filed May 24, 2007 entitled Dispenser cabinet for deodorant, all naming the same inventive. 
     
    
     BACKGROUND OF THE INVENTION  
       [0002]    The present invention relates to construction and arrangement of parts for a dispenser apparatus providing aerodynamic air passages to communicate with an evaporation chamber in a vaporizer and, more particularly, to a gravity driven fluid supply vessel for maintaining a supply of volatile liquid in a storage cup containing an edge portion of a wick for broadcasting the volatile liquid along the evaporation chamber. 
         [0003]    Description of the prior art: A dispenser for volatile fluid is disclosed in three related U.S. Pat. Nos. 5,533,705; 5,816,845 and 6,105,916 provides a drive selectively using large or small motor providing an air stream for generating vapor from a wick, ceramic wafers, or discs containing vaporizable deodorant reversible mounting back to back. Socket assemblies provide a socket for a motor of larger dimensions and a socket for a motor of smaller dimensions. A frame for a cabinet composed of separate back plate, top member and bottom member of a resilient plastic so that the top member and bottom member are snap-locked to the back plate and secured further by projections from the top and bottom members in slots in the back plate. The bottom member is a liquid tight tray capable of processing deodorants in bottles through wicks or can with wicks, absorbent surcotas and wafers. There is a bottle holder snap-locked to the underside of the top member. A battery-blower assembly is snap-locked to the back plate. The battery poles are joined to the wires from the blower-motor by clips using solder less connections. 
         [0004]    More recently as disclosed in U.S. Pat. No. 6,957,779 is a framed fluid delivery device that is made up of a fluid-delivery cartridge for the timed-release delivery of a fluid. The fluid delivery cartridge retained by a frame assembly uses a base portion for the delivery of fluid released from a cartridge. The base secures the fluid delivery cartridge within the frame assembly proximate the end when fluid is released. The fluid-delivery cartridge has a bottom, a top, and sides, and a dispersion pad positioned proximate the bottom of the fluid-delivery cartridge that at least partially surrounds the sides of the fluid-delivery cartridge. A generator to generate gas is used for powered discharge of volatile liquid from the storage cell that is part of the fluid delivery cartridge. 
         [0005]    Accordingly, it is an object of the present invention to provide a dispenser for an aromatic odor neutralizer embodying an enhanced aerodynamic passage for the mixture of vapors of odor neutralizer fluid with an ambient airflow. 
         [0006]    It is a further object of the present invention to provide a vaporizer having an evaporation chamber containing a wick traversing an anti spill seal for immersion in a bath of volatile liquid controlled by gravity feed. 
         [0007]    It is a further object of the present invention to provide an aromatic dispenser embodying a construction of parts to allow a choice to the desired dispersion rate of volatile liquid from a replaceable vaporizer cartridge by various means that include passive air currents, forced air by a motor driven fan, selective masking of areas an evaporation chamber supplied by a gravity driven dispenser for the volatile fluid. 
         [0008]    It is another object of the present invention to provide a vaporizer having a cylindrical evaporation chamber containing a wick immersed in a bath of volatile liquid driven by gravity from an integral vessel wherein a controlled ingress of air is exchanged for liquid discharge of volatile liquid. 
       SUMMARY OF THE INVENTION  
       [0009]    According to the present invention there is provided a vaporizer for an aromatic odor neutralizer, the vaporizer including the combination of a vessel including a side wall joined with a first end wall to form a gaseous impervious chamber above a stored volume of volatile liquid bounded by a dispensing wall opposite the first end wall, a ventilating housing including a cylindrical side wall for receiving the vessel to form a vaporization chamber there between terminating at a liquid storage cup for volatile liquid dispensed from the vessel, a metering wall encircling the dispensing wall, the metering wall having at least one opening for an intermittent flow of air into the gaseous impervious chamber counter concurrent with a discharge of volatile fluid from the vessel to the liquid storage cup, an upstanding surface in the liquid storage cup for piercing the dispensing end wall, and a wick having a portion immersed in volatile liquid in the liquid storage cup while residing in the vaporization chamber. 
         [0010]    According to a preferred form of the vaporizer embodying the present invention there is provided the combination of a vessel for dispensing a volatile liquid, a vessel cap to allow access to liquid storage compartment of the vessel and forms an airtight seal with the vessel, the vessel cap being non reversible thread connected by interfering flexible prongs on mating threads that seat to prevent unthreading of the vessel cap, a weaken end wall in a protruding sleeve section at end of the vessel opposite the cap, a rectangular wick fashioned into a cylinder without creases, a cylindrical sidewall of the vessel contains spaced apart protruding rings that protrude to vary heights such that largest protruding height resides at the liquid discharge end of the vessel for stabilizing the position of the wick when encircling the vessel, the cylindrical sidewall extends to a metering portion having openings dispersed about the terminal edge for counter concurrent flows of air and volatile fluid, and a ventilating housing with a cup at one end forming a reservoir for volatile liquid dispensed from the vessel, a knife edge upstanding from the bottom wall of the cup for piercing the weaken end wall, the end of the housing opposite the cup having a snap ring for fixedly positioning the cap of the vessel to form a evaporation chamber containing the wick spaced about the cylindrical wall of the housing. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS  
         [0011]    The present invention will be more fully understood when the following description is read in light of the accompanying drawings in which: 
           [0012]      FIG. 1  is a frontal isometric view of the preferred embodiment of apparatus according to the present invention for dispensing an aromatic odor neutralizer in the operative position of the component parts; 
           [0013]      FIG. 2  is a left side elevation view of the apparatus shown in  FIG. 1 ; 
           [0014]      FIG. 3  is a sectional view taken along lines III-III of  FIG. 1  with the vaporizer and fan units removed; 
           [0015]      FIG. 4  is a sectional view taken along lines IV-IV of  FIG. 1  with the dispenser cover moved to an open position and the vaporizer and fan units removed; 
           [0016]      FIG. 5  is a frontal isometric view of the preferred embodiment of apparatus according to the present invention with the dispenser cover located in an open position and the vaporizer remote to an operating position and the fan unit installed; 
           [0017]      FIG. 6  is a sectional view taken along lines VI-VI of  FIG. 5  with the vaporizer and fan units installed according to the preferred embodiment of the present invention; 
           [0018]      FIG. 7  is an exploded isometric view of the vaporization unit according to the present invention; 
           [0019]      FIG. 8  is an isometric view of the vaporization unit shown in  FIG. 7  in a preassembled state; 
           [0020]      FIG. 9  is a sectional view taken along lines IX-IX of  FIG. 8  illustrating the arrangement of parts of the vaporizer prior to an operative state for dispensing volatile liquid; 
           [0021]      FIG. 10  is a sectional view similar to  FIG. 9  and illustrating the arrangement of parts of the vaporizer in an operative state for dispensing volatile liquid; 
           [0022]      FIG. 11  is an isometric view of the vessel including an anti-spill pad in place on the outer face surface of the vessel; 
           [0023]      FIG. 12  is a detailed illustration of the anti-spill pad as shown in  FIG. 11 ; 
           [0024]      FIG. 13  is an isometric view illustrating the vessel and cap for supplying volatile fluid; 
           [0025]      FIGS. 14 ,  15  and  16  schematically illustrate the operational sequence of the locking barbs for installing the locking cap on the vessel; 
           [0026]      FIG. 17  is an isometric view of an alternative embodiment of storage vessel for dispensing volatile liquid for the vaporizer according to the present invention; 
           [0027]      FIG. 18  is an isometric view of a further alternative embodiment of storage vessel for dispensing volatile liquid for the vaporizer according to the present invention; 
           [0028]      FIG. 19  is a schematic illustration of the relation of parts during vaporization of volatile liquid according to the present invention; 
           [0029]      FIG. 20  is a schematic illustration of the relation of parts during flow of volatile liquid into a storage cup pf the vaporizer according to the present invention; 
           [0030]      FIG. 21  is an isometric illustration of a battery holder that is optionally added to the vaporizer for powering a motor driven fan; 
           [0031]      FIG. 22  is an isometric illustration of the battery holder operatively seated in the housing for the motor driven fan; and 
           [0032]      FIG. 23  is an isometric view illustrating the optional feature of a wrapper to control evaporation of the fluid. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0033]      FIGS. 1-6  illustrated the preferred embodiment of an aromatic dispenser apparatus  10  that includes according to the present invention a dispenser cover  12  pivotally joined to a dispenser frame  14  constructed to receive fasteners, not shown and well known in the art, to secure the an aromatic dispenser apparatus to vertical wall surface of the room or other structure. The dispenser frame  14  is constructed to carry a vaporizer  16  and, if desired, the option of a fan module  18  ( FIG. 5 ). 
         [0034]    The dispenser cover  12  is made up of a central body  20  that is elongated and convexly shaped in the direction of the elongated length. Body sidewall sections  22  and  23  are continuous along the opposed longitudinal sides of the central body  20  and define therewith a longitudinal cavity arranged to extend between top and bottom end walls  24  and  25  for forming a convection guide for airflow to each of the end walls. Body sidewall sections  22  and  23  are continuous along the opposed longitudinal sides with spaced apart walls  26 ,  27  and  28 ,  29 , respectively. The spaced apart walls  26 ,  27  and  28 ,  29  together with the sidewall sections and the central body  20  take the form of circular ring sector shaped walls that form part of the elongated convexly shaped central body. Vents  30  and  31  at opposite sides of the central body ventilate the interior of the dispenser cover. Vent  30  is bounded by an edge portion of sidewall section  22  and by opposite sides by walls  26  and  27 . Vent  31  is bound along an edge portion of sidewall section  23  and at opposite sides by walls  28  and  29 . The top and bottom end walls  24  and  25  each have an array of parallel slots  32  and  33 , respectively, bounded by a semicircular perimeter section containing curved slots  34  and terminal slots  35 . The lengths of the parallel slots  32  in the top wall  24  as compared with the parallel slots  33  in the bottom wall  25  are reduced to provide a cavity bounded by spaced parallel arms  36  extending in interior of the convexly shaped central body  20  where each arm contains an aperture  37  in the extended end portion terminating at an curved end wall  38  forming a cam locking surface for pivotally mounting of the dispenser cover  12  to the dispenser frame  14 . As shown in  FIGS. 3 ,  4  and  5  when the dispenser cover  12  is pivoted to the operative position, i.e. seated against to dispenser frame  14 , parallel arms  39  with hooked ends extend parallel with the lengths of the bars from the interior of the central body  20  for locking engagement with resilient latch bars  39 A extending from the lower portion of the dispenser frame  14  and terminating with lateral hooked ends. The resilient lock bars  39 A are displaced from locked engagement with the arms  39  by spaced bars  39 B on a key  39 C. Appropriately, spaced openings in the end wall  25  pass the bars  39 B into an engagement with free ends of the lock bars  39 A and deflect the hooked ends of the bars from last engagement with the ends of arms  39 . 
         [0035]    The dispenser frame  14  takes the form of an elongated structure embodying a construction to form a receptacle section  40  terminating at a mounting fixture  41  for pivotal support of the dispenser cover  12  between the opened position shown in  FIGS. 4 and 5  and an operating position shown in  FIGS. 1-3 . The mounting fixture  41  takes the form of a rectangular block  42  contains a hinge pin  43  extending from each of the opposite lateral sides to extend into the aperture  37  in the extended end portion of the arms  36 . The pivotal movement of the dispenser cover is controlled and limited by sliding contact between the curved end walls  38  along pressure bearing plate sections  44  that serve to hold the cam-locking surface formed on the ends of the curved end walls  38  for pivotally mounting of the dispenser cover  12  to the dispenser frame  14 . Side guards  45  and  46  project from the receptacle section  40  to traverse the vents  30  and  31  at the sides of the dispenser cover  12  when in the operating position. The side guards  45  and  46  are bounded in a spaced relation by the sidewall extensions  26 ,  27  and  28 ,  29 , which are coextensive with the end walls, and define opposed boundary edges of the vents. 
         [0036]    The side guards have apertures  45  and  46  for the passage of air currents and thereby ventilate a volume bounded between the side guards  45  and  46  and the receptacle section  40  wherein the vaporizer  16  is fixedly positioned by upper and lower spaced pairs of support hangers  47  and  48  to extend in a spaced apart relation between the projecting side guards. As best shown in  FIG. 5 , the side guards  45  and  46  will overlie an evaporation chamber in the vaporizer  16  when mounted on the receptacle section for exposing the vents at the sides of the dispenser cover  12  to ventilate vapors from the evaporation chamber. 
         [0037]    As shown in  FIG. 6 , the interconnected relation between the vaporizer  16  and the receptacle section  40  is controlled by a proprietary array arrangement of key apertures  49  formed in a grid plate section  50  of the vaporizer for a go/no go inter engaging relationship with a protruding array of keys  51  mounted in the receptacle section  40 . Underlying the receptacle section  40  are parallel T-shaped apertures  52  for interlocking engagement with enlarged heads of latch bars  53  extending from a drive frame  54 . The drive frame has a molded configuration with a cavity to receive a motor  55  for driving fan blade assembly  56  mounted on the shaft of the motor to produce an air stream along the elongated convexly shaped central body of the dispenser cover  12 . The fan blade assembly  56  includes helically arranged fan blades  57  extending from an annular sidewall of a hub  58 . The fan blades  57  are orientated on the hub  58  so as to create an up draft of air when driven by the motor. Guide bars  59  project from opposite lateral sides of the dispenser frame  14  to stabilize and guide the dispenser cover  12  during pivotal movement to the closed position. 
         [0038]    The vaporizer  16 , as shown in  FIGS. 6-10 , includes evaporation chamber  60  having an elongated tubular configuration and the side guards  45  and  46  as show in  FIG. 5  have concave configurations transverse to the extended length of the evaporation chamber to partly wrap in an outwardly spaced relation about the evaporation chamber and thereby maximize the exposure of the ambient air flow to the volatile liquid conducted by a wick  61 . The wick is generally rectangular shaped fibrous sheet of porous material fashioned into a cylinder without creases to reside in the evaporation chamber formed as a cylindrical cavity between a vessel  62  containing the supply of volatile liquid and a cylindrical ventilating housing  63  with a liquid storage cup  64  at one end forming a reservoir for volatile liquid dispensed from the vessel  62 . Preferably, the wick has a keystone shape to produce the configuration of a truncated cone to extend generally parallel with the correspondingly truncated conical shape of both the vessel  62  and the ventilated housing  63 . A portion of the wick  61  is immersed in volatile liquid in the liquid storage cup  64  while residing in the vaporization chamber. The shape of the ventilating housing  63  is comprised of upright post members  65  extending from the rim of the cup  64  and dispersed about a circle defined by the rim of the cup. The rim of the cup is extended so as to prevent spillage of fluid from the interior of the cup. The post members  65  are interconnected by transverse ribs  66  forming an elongated tubular venting cage extending between the side guards  45  and  46 . The post members  65  interconnected by the ribs  66  are arranged to provide that the cylindrical sidewall includes rectangular windows  66  for mounting the ventilating housing on the support hangers  47  and  48  in the receptacle section. The peripheral sidewall of the ventilating housing  63  includes parallel and radically outward extending stabilizer bars  68  to engage with the receptacle section when mounting the vaporizer to the elongated frame. 
         [0039]    As shown in  FIGS. 7-10 , the construction of the venting housing  63  produces an array venting windows  69  confronting the elongated convexly shaped central body of the dispenser cover  12 . Preferably, the sidewall of the vessel  62  or alternatively, the vessel  62  includes at least one wick support ring  70  in the vicinity of the cup  64  to maintain a desired spacing between of the wick from the confronting walls forming the evaporation chamber. Most desirably there are spaced apart rings protruding from a sidewall into the evaporation chamber for spacing the wick from the vessel. As shown in  FIGS. 6 ,  7  and  9  three spaced apart rings  70 ,  71 , and  72  from the vessel  62  protrude at varying heights with the greatest height located at the liquid discharge end of the vessel for spacing said wick from said vessel and stabilizing the wick in vaporization chamber. 
         [0040]      FIGS. 9-12  illustrate the preferred embodiment of the present invention includes an anti-spill sealing pad  73  having a generally rectangular shape, but preferably keystone shaped with tapering end walls, and dimensioned with a length sufficient to encircle the outer periphery of the vessel  62  immediately adjacent the support ring  70  at the liquid discharged end of the vessel  62 . The width of the sealing pad  73  is selected so as to traverse the height of the bottom row of venting windows  69 . As shown in  FIG. 12 , the sealing pad is preferably comprised of a layer  74   a  of elastic material such as expanded plastic, i.e. foamed plastic having a coating of aanadhesive  74   b  on the opposed planar face surfaces to form an interconnected relation by adhering to the confronting surfaces of the vessel  62  and the wick  61 . This interconnected relationship, as best shown in  FIGS. 9 and 10  is fortified by the thickness of the sealing pad being equal but preferably slightly greater than the width of the gap between the contact site on the vessel  22  and wick  61  near the liquid discharge end of the vessel. The resilient property of the layer of elastic material  74   a  maintains the integrity of the interconnected relation and provide the desire anti-spill seal to avoid a flow of volatile liquid from the wick while immersed in a bath of volatile liquid in cup  64 . It will be understood by those skilled in the art that the function of the wick  61  is to broadcast the volatile liquid about the entire surface area of the wick counter concurrent to prevailing gravitational force. The vaporizer  16  is placed in the operative position so that the major length of the wick remain parallel with the direction of gravity but in the event the vaporizer is place perpendicular to the operative position (horizontally) the liquid in the reservoir will propagate along the wick to such an extent that unwanted discharge may occur from the vaporizer. 
         [0041]      FIGS. 9 ,  10 ,  19  and  20  illustrate a tubular knife edge  75  projects in an upstanding manner from a bottom wall  76  of the cup  64  for piercing a weaken end wall section  77  in a dispensing wall  78  having the form of a protruding sleeve section extending from the end of the vessel  62  opposite a vessel end cap  79 , which is an optional alternative to an end wall integral with the side of the vessel. Preferably, the tubular knife edge  75  is traversed in the hollow of the tubular shape by an upstanding rib  76  in the liquid storage cup to support in a suspend fashion a fractured portion of the dispensing end wall produced by the knife edge  75  and residing in the vessel. The rib  76  angularly divides by traversing a portion of a cylinder internally to suspend a fractured part of the end wall. A metering wall  80  takes the form of a downward annular  extension of the side of the vessel  62 . The metering wall  80  is formed with openings  81  dispersed about the terminal edge for counter concurrent flows of air and volatile fluid. As shown in  FIGS. 9 ,  10 ,  13 ,  19  and  20  the metering wall  80  encircles the dispensing wall  78 . The metering wall  80  has at least one opening, for an intermittent flow of air into the gaseous impervious chamber formed within the vessel above the volume of volatile stored therein counter concurrent with a discharge of volatile fluid from the vessel to the liquid storage cup. The dispensing wall  78  extends to a dispensing plane  85  recessed from a normally submerged metering plane  86  in the liquid contained in the storage cup. Preferably, the metering wall  80  includes a plurality of openings  81  extending in a direction proceeding from the normally submerged metering plane  86  beyond the dispensing plane  85  for establishing the dispensing plane. As shown in  FIGS. 19 and 20  when the fluid level in the cup  64  is depleted by the operation of the wick  61  to a level below the metering plane  86  openings  81  serve to control an intermittent flow of air by arrow A into the gaseous impervious chamber counter concurrent with a flow of volatile fluid by arrow F from the vessel to the liquid storage cup as shown in  FIG. 20 . 
         [0042]    As shown in FIGS.  7  and  13 - 16  the provision of a flanged vessel end cap  79  allows the access to a liquid storage compartment of the vessel  62  for the introduction of the volatile liquid into the vessel and forms an airtight seal with the vessel. The vessel end cap has threads  90  that engage with mating threads  91  on a rim portion  92  of the vessel. To prevent unwanted access to the storage chamber in the vessel, unthreading of the vessel end cap is prevented by the provision of upstanding barbs  93  at spaced intervals along the screw threads  90  corresponding to intervals of upstanding barbs  94  along the mating screw thread  91  on annular side wall formed by the rim portion  92 . The operation of the cap moved into a locked vacuum tight condition on the vessel is diagrammatically illustrated by  FIGS. 114-16 . As shown in  FIG. 14  projecting from the threads  90  on the cap are the barbs  93  and the threaded relationship with the threads  91  on the vessel operate to move the barb  94  into a confronting relationship with barbs  92 .  FIG. 15  illustrates that travel of the threads  90  along the threads  91  cause the barbs  93  to collide with the barbs  94  and deform due to the elasticity of the plastic material forming the vessel and the vessel cap. The deformation eventually gives way to the passage of the barbs beyond the collision site. As shown in  FIG. 16 , after the barbs  93  and  94  pass each other the elastic property of the material forming the barbs allow a restoration of the original shape so that the barbs confront one another in an interlocking relation and thereby prevent movement in the reverse direction to the direction traveled into the locked positions. 
         [0043]    In the embodiments of the vessel according to the present invention shown in  FIGS. 17 and 18 , a flanged top end wall  96  of the vessels  97  and  98 , respectively, is integrally formed with the sidewall  100  to provide the gaseous impervious chamber above a stored volume of volatile liquid in each of the vessels. The protruding sleeve section  101  of the vessel  97  shown in  FIG. 17  is provided with internal threads  102  to receive external threads  103  on a closure cap  104  containing a pierceable sealed film or membrane  105  from which there projects a metering wall  106  comprise of a half divided tube segment forming a protruding semicircular guard wall. The protruding sleeve section  107  of the vessel  98  shown in  FIG. 18  is provided with external threads  108  to receive internal threads in a rim  109  of a closure cap  110  containing a pierceable sealed film or membrane  111 . The sidewall of the vessel is continued by the projecting metering wall  80  having the opening  81  dispersed about the terminal edge for counter concurrent flows of air and volatile liquid as described herein above. 
         [0044]    As shown in  FIGS. 8 ,  9  and  10 , the ventilating housing  63  further includes snap ring segments  120  to engage and release each of the cavities located in a flanged portion  124  of the end cap  79  of the vessel  62  and top walls  96  at the end of the vessels  97  and  98  which are remote to the vessel ends constructed to dispense volatile liquid. The snap ring segments  120  fixedly position the metering wall at the dispensing end of the vessel at a predetermined spacing from floor of the liquid storage cup  64 . Diametrically opposed tear segments  121  are between snap ring segments  120 . The tear segments  121  are joined to the snap ring segments by weakened walls that are easily fractured for removal to allow flexing of the snap ring segments when positioning the flanged end of the vessel between said snap ring segments. The snap ring segments  120  include a truncated conical support surface  122  that receives in a confronting relation a mating truncated conical surface  123  formed on the flanged portion of the end caps  79  and top wall  96  for suspending the vessel in the evaporation chamber. The vaporizer of the present invention is quickly replaced by removing the flange portion  124  of the cap  122  from the snap ring segment  120  and then inserting a replacement vaporizer by inserting the flange  124  in the snap ring segments as described herein above. The typical time for a total vaporization of the fluid in a newly installed vaporizer is 60 days with passive airflow and typically 30 days with a forced airflow by the fan assembly. 
         [0045]    When it is desired to artificially induce an air flow in the dispenser cover, as shown in  FIGS. 5 ,  21  and  22 , a battery storage compartment is formed by opposed end walls  130  confronting pole pieces of a battery when seated against a cylindrical battery  131  container wall  132  terminating at spaced apart suspension arms  133  for support by the vaporizer  16 . Strips  134  of electrically conductive material extending from the drive frame  54  toward the end walls  130  for contact with pole pieces of a battery when stored in a battery container wall  132 . The electrically conductive strips  134  are retained by upstanding arms  135  spaced apart sufficiently to receive the end walls of the battery storage compartment. The end walls  130  of the battery storage compartment are arranged to expose the pole pieces of a battery while traversing opposite ends thereof. The upstanding arms  135  comprise a rectangular bar traversing one end of the battery compartment and a rectangular bar containing a centrally located indexing protuberance  136  to receive and uniquely define the location of a positive pole piece of a battery when located in the battery storage compartment. The drive frame  54  includes ridge aligned with one of the electrically conductive strips for passage into the indexing protuberance  136  to allow electrical connection between pole pieces of the battery and the electrically conductive strips. If desired, the battery may be eliminated and a step down transformer with an AC to DC rectifier can be direct connected to the fan motor. 
         [0046]    As shown in  FIG. 21  there is shown the optional feature of providing a wrapper  200  constructed of a sheet of heat shrinkable plastic material fashioned into a tubular shape that can be passed over the vaporizer to substantially completely envelope the outer cylindrical surface. The wrapper  200  stops short to allow exposure of the radically outward extending stabilizer bars  68 . The wrapper is formed with diametrically opposed vertical perforations  201  and a perforation  202  encircling the mid portion of the tubular shape. The perforations  201  and  202  are used for controlling the extent to which ambient air can infiltrate the evaporation chamber. More particularly, severing the wrapper  200  along perforation  202  allows removal of an upper half of the wrapper from the ventilating housing  63  of the vaporizer thus avoiding exposure of ambient air to the entire height of the evaporation chamber. The use of the wrapper serves to throttle back the speed of dispensing of the volatile liquid. Severing the wrapper along perforation  201  allows removal of the entire wrapper from the vaporizer thus exposure of ambient air to the entire height of the evaporation chamber and thus serves to maximizing the speed of dispensing of the volatile liquid. 
         [0047]    While the present invention has been described in connection with the preferred embodiments of the various figures, it is to be understood that other similar embodiments may be used or modifications and additions may be made to the described embodiment for performing the same function of the present invention without deviating there from. Therefore, the present invention should not be limited to any single embodiment, but rather construed in breadth and scope in accordance with the recitation of the appended claims.