Abstract:
A dust collector for filtering dust suspended in air, comprising: a vacuum unit for drawing the air; a cyclone body defining a cyclone body peripheral wall delimiting a plenum, a cyclone air inlet provided in the cyclone body peripheral wall for admitting the air, a cyclone body vacuum inlet in fluid communication with the vacuum unit for drawing the air from the plenum and a cyclone body dust outlet provided at the bottom of the plenum for evacuating the dust from the cyclone body; and baffles extending in the plenum from the cyclone body peripheral wall.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates generally to air filtering devices and, more particularly, to a dust collector. 
       BACKGROUND 
       [0002]    Industrial grade dust collectors are well known for collecting dust on floors, near power tools, as well as airborne particles such as sawdust, gypsum dust and the likes in construction sites or woodshops where air quality and fire safety for workers are primary concerns. 
         [0003]    Known industrial grade dust collectors that are portable to construction sites typically comprise a vacuum blower unit fluidly coupled to a vacuum chamber, containing a vacuum filter, and a dust collecting means for collecting dust particles filtered from a dust laden air by the dust filter. 
         [0004]    While these known dust collector devices can generally fulfill the main objective of collecting airborne dust in and around a construction site or the likes, they are also generally reputed to be significantly cumbersome to move around, particularly through door frames, complex to maintain, such as when a cleaning or replacement operation of the vacuum filter is required, and significantly expensive to buy by small work contractors. 
         [0005]    Thus, small contractors are often tempted to omit the acquisition of such dust collectors and, consequently, put the basic health and safety work measures at risk of not being met for their workers. 
         [0006]    In view of the above, there is a need in the industry for an improved dust collector. 
         [0007]    An object of the present invention is to provide such a dust collector. 
       SUMMARY OF THE INVENTION 
       [0008]    In a broad aspect, the present invention provides an improved dust collector usable for filtering and collecting dust particles from dust laden air. 
         [0009]    According to an embodiment of the present invention, the dust collector comprises a vacuum blower unit. The vacuum blower unit defines a blower unit inlet and a blower unit outlet. 
         [0010]    The dust collector further comprises a dust drawer unit for collecting dust particles. The dust drawer unit defines a dust drawer unit inlet for receiving filtered dust particles therethrough. 
         [0011]    The dust collector further comprises a cyclone chamber unit that extends between the blower unit inlet and the drawer unit dust inlet. 
         [0012]    The cyclone chamber unit defines a cyclone chamber first opening fluidly coupled with the vacuum unit inlet, a cyclone chamber second opening fluidly coupled with the dust drawer inlet, and a cyclone chamber plenum extending between the cyclone chamber first opening and the cyclone chamber second opening respectively. 
         [0013]    The cyclone chamber plenum is defined by a cyclone chamber inner wall. The cyclone chamber inner wall has a substantially cylindrical configuration and extends axially vertically between the blower unit inlet at an upper end thereof, and the drawer unit dust inlet at a bottom end thereof. 
         [0014]    The cyclone chamber inner wall defines at least one cyclone chamber port opening that is extending through a peripheral portion of the wall. The at least one cyclone chamber port opening is fluidly coupled to a source of dust laden air. 
         [0015]    The dust collector further comprises a vacuum filter unit having typically a substantially cylindrical configuration and positioned axially centrally within the cyclone chamber plenum. 
         [0016]    The vacuum filter unit is sized and shaped so as to define a wall-to-filter space extending coaxially between the cyclone chamber inner wall and the vacuum filter unit. 
         [0017]    The vacuum filter unit is closed at one end and defines a filter opening at an opposed end thereof. The filter opening is fluidly coupled to the blower unit inlet. 
         [0018]    The dust collector further comprises at least one dust baffle. Each one of the at least one dust baffle is attached to the cyclone chamber unit and positioned in the wall-to-filter space for impacting with dust particles circulating therein. 
         [0019]    Thus, when the vacuum blower unit is powered on, a forced stream of dust laden air is circulated through the at least one cyclone chamber port opening, then into the wall-to-filter space, then through the vacuum filter unit, then into the blower unit inlet, and finally exhaust out of the blower unit outlet. 
         [0020]    Thereby, with dust particles circulating through the wall-to-filter space, a significant portion thereof impacts with the at least one dust baffle so as to lose sufficient velocity for falling by gravity through the dust drawer unit inlet and be collected in the dust drawer unit, while substantially all the rest of the dust particles impacts with the vacuum filter unit before eventually falling also into the dust drawer unit. 
         [0021]    This impacting effect of the at least one baffle on the circulating dust particles in the cyclone chamber unit is advantageous since it significantly reduces the clogging effect of the vacuum filter unit by the dust particles while the dust collector is in operation. 
         [0022]    In some embodiments, the cyclone chamber unit includes a plurality of dust baffle attached in a circumferentially spaced apart relationship along the cyclone chamber inner wall. The plurality of dust baffle extends between the cyclone chamber first opening and the cyclone chamber second opening. 
         [0023]    In some embodiments, each one in the plurality of dust baffle may be represented by a substantially rectilinear and vertically extending stem member. 
         [0024]    In some other embodiments, each one in the plurality of dust baffle may be represented by a pair of stem members arranged in a horizontally extending V-shaped configuration, wherein the apex thereof is directed against the direction of the vortex, and positioned substantially in register with an horizontal plane extending substantially centrally through the at least one cyclone chamber port opening. 
         [0025]    In some other embodiments, a significant portion of each spaced apart distal ends of the V-shaped configuration may be extending oppositely distally relatively to one another, and vertically towards an adjacent one of the cyclone chamber first opening and the cyclone chamber second opening respectively. 
         [0026]    In yet some other embodiments, the at least one dust baffle may be represented by a single tube-shaped grid composed of superposed stem members that define diamond shaped intersections. The tube-shaped grid preferably adjacently conforms to, and is attached along, the cyclone chamber inner wall, and extends axially longitudinally between the cyclone chamber first opening and the cyclone chamber second opening. 
         [0027]    In some embodiments, each stem member may define a substantially rectangular cross-section. 
         [0028]    In some other embodiments, each stem member may define a cross-section having a substantially right-angle triangle configuration, wherein one of the edges in the right angle is substantially perpendicularly facing against the direction of the vortex. 
         [0029]    In yet some other embodiments, each stem member may define a cross-section having a substantially right-angle triangle configuration, wherein one of the edges in the right angle is substantially perpendicularly facing away from the direction of the vortex. 
         [0030]    The stem members are for example made of one of the materials selected from the group consisting of metal, rubber and ceramic. 
         [0031]    The dust drawer unit includes a dust drawer housing defining a drawer bay for removably receiving therein in a slide-fit relation a dust drawer through a drawer bay opening defined through a lateral wall thereof. 
         [0032]    The drawer unit dust inlet is in fluid communication with the interior of the drawer bay and in register substantially above a top opening of the dust drawer when the latter is fully slidably engaged in the drawer bay using a drawer handle provided at a front end thereof. 
         [0033]    The dust collector further includes wheels, such as caster wheels, for allowing the dust collector to be portably wheeled to a desired location. 
         [0034]    The dust collector has for example an overall dimension in height and at least one overall dimension in width that are suitably dimensioned for allowing the dust collector to freely pass, in an upright attitude, through a conventionally sized door frame. 
         [0035]    A method of use of the dust collector is substantially identical to the method of use of conventional vacuum units commonly found in industrial environments, construction sites, woodshops and the likes. 
         [0036]    Thus, the present invention provides a dust collector for filtering dust laden air that is significantly more easily moved around through door frames of construction sites, is relatively more easy maintained due to its relatively simple assembly, as well as being relatively inexpensive to manufacture, when compared to known industrial dust collectors actually used on construction sites and the likes. 
         [0037]    The present application claims benefit from UK request application 1417125.0 filed Sep. 27, 2014, the contents of which is hereby incorporated by reference in its entirety. 
         [0038]    Other objects, advantages and features of the present invention will become more apparent upon reading of the following non-restrictive description of some embodiments thereof, given by way of example only with reference to the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0039]      FIG. 1 , in a perspective view, illustrates an embodiment of a dust collector, according to the present invention; 
           [0040]      FIG. 2 , in a perspective, exploded view, illustrates the dust collector in  FIG. 1 ; 
           [0041]      FIG. 3 , in a top plan view, illustrates the dust collector in  FIG. 1 , here shown with its vacuum blower unit removed; 
           [0042]      FIG. 4 , in a top perspective view, illustrates the dust collector in partial view in  FIG. 3 , here shown with the vacuum blower unit and vacuum filter unit removed; 
           [0043]      FIG. 5 , in a front elevational view, illustrates the dust collector in  FIG. 1 ; 
           [0044]      FIG. 6 , in a left side elevational view, illustrates the dust collector in  FIG. 1 ; 
           [0045]      FIG. 7 , in a rear elevational view, illustrates the dust collector in  FIG. 1 ; 
           [0046]      FIG. 8 , in a right side elevational view, illustrates the dust collector in  FIG. 1 ; 
           [0047]      FIG. 9 , in a top plan view, illustrates the dust collector in  FIG. 1 ; 
           [0048]      FIG. 10 , in a schematic side plan view, illustrates the relative horizontal alignment and shape configuration of a pair of cyclone chamber port openings usable in the dust collector of  FIG. 1 ; 
           [0049]      FIG. 11 , in a schematic side plan view, illustrates baffles of a first type usable in the dust collector of  FIG. 1 ; 
           [0050]      FIG. 12 , in a schematic side plan view, illustrates baffles of a second type usable in the dust collector of  FIG. 1 ; 
           [0051]      FIG. 13 , in a schematic side plan view, illustrates baffles of a third type usable in the dust collector of  FIG. 1 ; 
           [0052]      FIG. 14 , in an end plan view, illustrates a first transversal cross-sectional configuration of a baffle usable in the dust collector of  FIG. 1 ; 
           [0053]      FIG. 15 , in an end plan view, illustrates a second transversal cross-sectional configuration of a baffle usable in the dust collector of  FIG. 1 ; 
           [0054]      FIG. 16 , in an end plan view, illustrates a third transversal cross-sectional configuration of a baffle usable in the dust collector of  FIG. 1 ; 
           [0055]      FIG. 17 , in an elevational, side plan view, illustrates another shape configuration of a baffle; 
           [0056]      FIG. 18 , in an enlarged, side perspective view, illustrates the shape configuration of a baffle within section line XIIA of  FIG. 17 ; 
           [0057]      FIG. 19 , in an end plan view, illustrates a fourth transversal cross-sectional configuration of a baffle usable in the dust collector of  FIG. 1 ; 
           [0058]      FIG. 20 , in an end plan view, illustrates a fifth transversal cross-sectional configuration of a baffle usable in the dust collector of  FIG. 1 ; 
           [0059]      FIG. 21 , in an end plan view, illustrates a sixth transversal cross-sectional configuration of a baffle usable in the dust collector of  FIG. 1 ; 
           [0060]      FIG. 22 , in an end plan view, illustrates a seventh transversal cross-sectional configuration of a baffle usable in the dust collector of  FIG. 1 ; 
           [0061]      FIG. 23 , in a perspective view, illustrates baffles of a fourth type usable in the dust collector of  FIG. 1 ; and 
           [0062]      FIG. 24 , in a perspective view, illustrates baffles of a fifth type usable in the dust collector of  FIG. 1 ; 
       
    
    
     DETAILED DESCRIPTION 
       [0063]    The term “substantially” is used throughout this document to indicate variations in the thus qualified terms. These variations are variations that do not materially affect the manner in which the invention works and can be due, for example, to uncertainty in manufacturing processes or to small deviations from a nominal value or ideal shape that do not cause significant changes to the invention. These variations are to be interpreted from the point of view of the person skilled in the art. Also, directional terminology, such as bottom, refers to the holder of the invention in a typical free-standing, upstanding, configuration, resting on a table surface for example, before it is handled to pour a beverage. This reference configuration is for reference and convenience purposes and should not be used to restrict the scope of the claims unless explicitly required by the structure of a specific claim. The reader skilled in the art will understand that the holder may be, in some embodiments, perfectly usable standing on its side when compared to the description below. However, typical use of the holder when no beverage is poured is usually with the holder upstanding as seen the drawings and described below. 
         [0064]      FIGS. 1, 2 and 5 to 9  inclusively, illustrates various aspects of an embodiment, according to the present invention, of a dust collector  10  usable for filtering and collecting dust particles from dust laden air. 
         [0065]    The dust collector  10  comprises a vacuum blower unit  12 . The vacuum blower unit  12  defines a blower unit inlet  14  and a blower unit outlet  16 . The vacuum blower unit  12  is powered by an external electrical source such as, for example, through a conventional 110 VAC power cord  18  plugged into a wall outlet or the likes. 
         [0066]    The dust collector  10  further comprises a dust drawer unit  20  for collecting dust particles filtered from a dust laden air  100 , by the dust collector  10 . 
         [0067]    The dust drawer unit  20  is disposed in a spaced apart relationship relative to the vacuum blower unit  12 . Furthermore, the dust drawer unit  20  defines a dust drawer unit inlet  24  for receiving filtered dust particles therethrough. 
         [0068]    The dust collector  10  further comprises a cyclone chamber unit  26 . The cyclone chamber unit  26  extends between the blower unit inlet  14  and the drawer unit dust inlet  24 . In some embodiments, the internal portion of the cyclone chamber unit, including or no the dust baffles  50  described hereinbelow, may be covered with or coated with a substantially resilient material, such as rubber or a similar material, to absorb energy from dust particles circulating in the cyclone chamber unit  26 . 
         [0069]    The cyclone chamber unit  26  defines a cyclone chamber first opening  30  fluidly coupled with the vacuum unit inlet  14 , a cyclone chamber second opening  32  fluidly coupled with the dust drawer inlet  24 , and a cyclone chamber plenum  34  extending between the cyclone chamber first opening  30  and the cyclone chamber second opening  32  respectively. 
         [0070]    The cyclone chamber plenum  34  is defined by a cyclone chamber inner wall  36 . The cyclone chamber inner wall  36  has a substantially cylindrical configuration and extends axially vertically between the blower unit inlet  14  at an upper end thereof, and the drawer unit dust inlet  24  at a bottom end thereof. 
         [0071]    The cyclone chamber inner wall  36  defines at least one cyclone chamber port opening  38 , as best illustrated in  FIG. 4 , that is extending through a peripheral portion of the wall  36 , thus creating a fluid passageway between the exterior of the dust collector  10  and the cyclone chamber plenum  34 . The at least one cyclone chamber port opening  38  being fluidly coupled to a source of dust laden air  100 . 
         [0072]    The dust collector  10  further comprises a vacuum filter unit  40 . The vacuum filter unit  40  has a substantially cylindrical configuration and is positioned axially centrally within the cyclone chamber plenum  34 . 
         [0073]    The vacuum filter unit  40  is sized and shaped so as to define a wall-to-filter space  42  extending coaxially between the cyclone chamber inner wall  36  and the vacuum filter unit  40 . 
         [0074]    The vacuum filter unit  40  is closed at one end and defines a filter opening  44  at an opposed end thereof. The filter opening  44  is fluidly coupled to the blower unit inlet  14 . 
         [0075]    As exemplified in  FIG. 2 , the vacuum filter unit  40  has a tubular configuration with a lower end thereof sealably closed with an end cap  46 , and its upper end sealably coupled with the blower unit inlet  14  of the vacuum blower unit  12 . 
         [0076]    In some embodiments, the vacuum filter unit  40  includes a HEPA grade filter  48 , for example a H14 class filter which must filter 99.995% of particles (e.g. particles smaller than 0.1 microns). Thus, with a tube shaped HEPA filter  48  having thus only one opening securely sealed around the blower unit inlet  14 , the dust collector  10  conforms to some of the standardized HEPA specifications for air filtering vacuum units. The filter  48  may also be covered by a metallic or polymeric (such as Nylon™) mesh, or both, to protect against fire propagation. 
         [0077]    Conveniently, for facilitating the periodic cleaning or replacement of the vacuum filter unit  40 , the latter may be suitably sized in length so as to be positioned in a vertically compressed state between a support grid  33  at the junction between the cyclone chamber unit  26  and the blower unit inlet  14 . The vacuum blower unit  12  is removably sealably attached to a peripheral edge of the cyclone chamber first opening  30  of the cyclone chamber unit  26  through a plurality of selectively detachable clips assemblies  31  positioned in radially spaced apart relationship therearound. 
         [0078]    The dust collector  10  further comprises at least one dust baffle  50 , and typically a plurality of dust baffles  50 . Each one of the at least one dust baffle  50  is attached to the cyclone chamber unit  26  and positioned in the wall-to-filter space  42  for impacting with dust particles circulating therein. In some embodiments, the dust baffles  50  are substantially elongated and substantially parallel to the longitudinal axis of the cyclone chamber unit. In other embodiments, the dust baffles are angled with respect to an axis parallel to the longitudinal axis of the cyclone chamber unit, for example between 20 and 90 degrees relative to the horizontal, and in a very specific example at substantially 30 degrees relative to the horizontal. The dust baffles  50  may be angled so that they go upwardly, downwardly, or alternatively upwardly and downwardly when going along the vortex, which deflects the dust particles upwardly and/or downwardly. 
         [0079]    Thus, when the vacuum blower unit  12  is powered on, a forced stream of dust laden air  100  is circulated through the at least one cyclone chamber port opening  38 , then into the wall-to-filter space  42 , then through the vacuum filter unit  40 , then into the blower unit inlet  14 , and finally exhaust out of the blower unit outlet  16 . Thereby, with dust particles circulating through the wall-to-filter space  42 , a significant portion thereof impacts with the at least one dust baffle  50  so as to lose sufficient velocity for falling by gravity through the dust drawer unit inlet  24  and be collected in the dust drawer unit  20 , while substantially all the rest of the dust particles impacts with the vacuum filter unit  40  before eventually falling also into the dust drawer unit  20 . 
         [0080]    This impacting effect of the at least one baffle  50  on the circulating dust particles in the cyclone chamber unit  26  is advantageous in the present invention since it significantly reduces the clogging effect of the vacuum filter unit  40  by the dust particles while the dust collector  10  is in operation. 
         [0081]    Now referring more particularly to  FIGS. 1 to 4  inclusively, the dust collector  10  may further include at least one port duct  52 . The at least one port duct  52  defines a tubular configuration having one end fluidly coupled to a corresponding one of the at least one cyclone chamber port opening  38 , and extends distally therefrom tangentially relative to the cyclone chamber inner wall  36  so as to force the circulating dust laden air  100  into a vortex  102  rotating coaxially within the wall-to-filter space  42 . 
         [0082]    In some embodiments, each one of the at least one port duct  52  may have a vertical cross-section dimension that is roughly equivalent to between ¼ and ½ of the longitudinal axis of the cyclone chamber inner wall  36 . In some specific embodiments of the present invention, the cross-section diameter of the at least one port duct  52  is roughly equivalent to ⅓ of the length of thereof the cyclone chamber inner wall  36  along its longitudinal axis. 
         [0083]    In some embodiments, at least one of the at least one port duct  52  further includes a port duct manifold  54 . The port duct manifold  54  defines at least two individual vacuum ports  56  for selectively coupling thereto, for example, a respective number of vacuum tubing&#39;s equipped with vacuum heads or the like (not shown). 
         [0084]    For example, the port duct manifold  54  may define six individual vacuum ports  56 . As would be obvious with someone familiar with industrial vacuum units, the individual vacuum ports  56  may be typically equipped with quick-connect couplings that are automatically sealed close when not in use (not shown). 
         [0085]    In some embodiments the dust collector  10  includes two port ducts  52 , with a first port duct  58  having a circular cross-section, and a second port duct  60  having a vertically extending rectangular cross-section. Each cyclone chamber port opening  38  corresponding to a respective one of the first and second port ducts  58  and  60  is shaped and sized to conform to the junction between the cyclone chamber inner wall  36  and each port duct respectively, as illustrated in  FIG. 4 . 
         [0086]    The first port duct  58  and the second port duct  60  each extends tangentially relative to the cyclone chamber inner wall  36  and perpendicularly relative to one another along a common horizontal plane, and with both port ducts disposed adjacently relative to the cyclone chamber second opening  32 . 
         [0087]    Now referring more particularly to  FIGS. 4 and 10 to 18  inclusively, in some embodiments, the cyclone chamber unit  26  includes a plurality of dust baffles  50  attached in a circumferentially spaced apart relationship along the cyclone chamber inner wall  36 . The plurality of dust baffles  50  extends between the cyclone chamber first opening  30  and the cyclone chamber second opening  32 . 
         [0088]    In some embodiments, as illustrated in  FIG. 11 , each one in the plurality of dust baffles  50  may be represented by a substantially rectilinear and vertically extending stem member  62 . 
         [0089]    In some other embodiments, as illustrated in  FIG. 12 , each one in the plurality of dust baffles  50  may be represented by a pair of stem members  62  arranged in a horizontally extending V-shaped configuration, wherein the apex thereof is directed against the direction of the vortex  102 , and positioned substantially in register with an horizontal plane extending substantially centrally through the at least one cyclone chamber port opening  38  (as illustrated in  FIG. 10 ). 
         [0090]    In some other embodiments, as illustrated in  FIG. 13 , a significant portion of each spaced apart distal ends of the V-shaped configuration may be extending oppositely distally relatively to one another, and vertically towards an adjacent one of the cyclone chamber first opening  30  and the cyclone chamber second opening  32  respectively. 
         [0091]    In yet some other embodiments, as illustrated in  FIGS. 17 and 18 , the at least one dust baffle  50  may be represented by a single tube-shaped grid (only partially showed in the figures) composed of superposed stem members  62  that define diamond shaped intersections. The tube-shaped grid preferably adjacently conforms to, and is attached along, the cyclone chamber inner wall  36 , and extends axially longitudinally between the cyclone chamber first opening  30  and the cyclone chamber second opening  32 . 
         [0092]    Each stem member  62  in an intersection between two stem members  62  is substantially at forty five degree relative to the vertical, and substantially at a ninety degree angle relative to one another. Thus, a plurality of angled surfaces  64  are created in opposition to the direction of the vortex  102 , and a plurality of relatively short passageways  66  and pocket interstices  68  are created at intersections between superposed stem members  62 . In turn, the angled surfaces  64 , passageways  66  and pocket interstices  68  cooperatively create impacting obstacles on the trajectories of dust particles circulated by the vortex  102  therein. 
         [0093]    In some embodiments, as illustrated in  FIG. 14 , each stem member  62  may define a substantially rectangular cross-section. 
         [0094]    In some other embodiments, as illustrated in  FIG. 15 , each stem member  62  may defines a cross-section having a substantially right-angle triangle configuration, wherein one of the edges in the right angle is substantially perpendicularly facing against the direction of the vortex. 
         [0095]    In yet some other embodiments, as illustrated in  FIG. 16 , each stem member  62  may define a cross-section having a substantially right-angle triangle configuration, wherein one of the edges in the right angle is substantially perpendicularly facing away from the direction of the vortex. 
         [0096]    In yet some other embodiments, as illustrated in  FIG. 19 , each stem member  62  may define a transversal cross-section having a substantially H-shaped configuration, wherein the two openings of the H face respectively towards and away from the direction of the vortex  102 . 
         [0097]    In yet some other embodiments, as illustrated in  FIG. 20 , each stem member  62  may define a transversal cross-section having a substantially C-shaped configuration, wherein the opening of the C faces towards the direction of the vortex  102 . 
         [0098]    In yet some other embodiments, as illustrated in  FIG. 21 , each stem member  62  may define a transversal cross-section having a substantially L-shaped configuration, oriented to that one leg  63  of the “L” is substantially perpendicular to the peripheral wall of the cyclone chamber unit  26  and the other leg  65  is substantially perpendicular to the first leg  63 , and points towards the direction from which the vortex  102  comes. 
         [0099]    In yet some other embodiments, as illustrated in  FIG. 22 , each stem member  62  may define a transversal cross-section having a substantially arc-segment shape oriented similarly to the L-shaped configuration of the stem member  62  of  FIG. 21 . 
         [0100]    In some embodiments, the stem members  62  of  FIGS. 11 to 16 and 19 to 22  may be of constant cross-section longitudinally therealong, with no apertures therein. In other embodiments, apertures  63  are provided in the stem members  62  and extend therethrough, as seen in  FIGS. 23 and 24 . The apertures  67  may be deprived of material in register with them, as seen in  FIG. 23 . The apertures  67  may also have a louver  69  in register with them, as seen in  FIG. 25 . The apertures  67  may be substantially adjacent to the peripheral wall of the cyclone chamber unit  26 , as seen in  FIG. 23 , or spaced apart therefrom, as seen in  FIG. 24 . The apertures  67  reduce the loss of velocity in the vortex  102  due to the stem members  62 . For examples, the louvers  69  and apertures  67  are manufactured simultaneously by punching the apertures  67  with a side thereof remaining intact and bending the resulting louver  69  away, at an angle, from the aperture  67 . 
         [0101]    The reader skilled in the art will appreciate that the dust baffles  50  may all have the same configuration, or that the various configurations described hereinabove and illustrated in  FIGS. 11 to 24  may be mixed together in the same unit. 
         [0102]    Stem members  62  that are adjacently parallelly extending are spaced apart a distance of roughly between one and fifty (50) centimeters. Preferably, the distance between adjacently parallelly extending stem members is roughly twenty (20) centimetres. 
         [0103]    Each stem member  62  may have a stem radial cross-section dimension extending radially inwardly relative to the cyclone chamber inner wall  36  that is roughly between 0.5 and 10 centimeters. Preferably, the stem radial cross-section dimension is about 1 centimetre. 
         [0104]    The stem members  62  are for example made of one or more of the materials selected from the group consisting of metal, rubber and ceramic. 
         [0105]    Without limiting the claims, except when such claims explicitly mention mechanisms of action, the dust baffles  50  are believed to operate as follows. The portion of each stem member  62  that faces the vortex  102  typically contribute to the deflection of dust particles to reduce their speed, mainly for the larger dust particles. The portion of each stem member  62  that faces away from the vortex  102  creates turbulence, which reduces the velocity along the vortex  102  of the other particles. Since the dust particles lose velocity more quickly than in dust collectors in which there are no baffles  50 , the vacuum filter unit  40  requires less maintenance. 
         [0106]    The vacuum blower unit  12  preferably includes a vacuum blower housing defining a blower fluid passageway between the blower unit inlet  14  and the blower unit outlet  16 . A blower assembly represented by a blower turbine coupled to the rotor of an electrical blower motor is mounted axially centrally within the blower fluid passageway so as to have blown air circulating around the blower assembly and, thus, effectively cool the blower motor during operation. 
         [0107]    Furthermore, the blower assembly is designed to generate a cubic per minute (CFM) of airflow that does not exceeds the capacity of the vacuum filter unit  40 . Thus, the dust collector  10  may conform to some of the standardized HEPA specifications for air filtering vacuum units. 
         [0108]    The dust drawer unit  20  includes a dust drawer housing  70  defining a drawer bay  72  for removably receiving therein in a slide-fit relation a dust drawer  74  through a drawer bay opening  76  defined through a lateral wall thereof. 
         [0109]    The drawer unit dust inlet  24  is in fluid communication with the interior of the drawer bay  72  and in register substantially above a top opening of the dust drawer  74  when the latter is fully slidably engaged in the drawer bay  72  using a drawer handle  78  provided at a front end thereof. 
         [0110]    The drawer bay opening  76  and the dust drawer  74  cooperatively form a hermetically sealed junction therebetween when the dust drawer  74  is fully slidably engaged in the drawer bay  72  so as to prevent any vacuum leakage. For example, a sealing ring (not shown) may be provided along the circumference of the drawer bay opening  76  for sealably contacting a peripheral portion of the front end wall  80  of the dust drawer  74 . 
         [0111]    Other configurations of a dust drawer unit  20  and sealing means are also possible. For example (not shown), the dust drawer housing  70  may be represented by a downward extension of the cylindrically shaped cyclone chamber inner wall  36  with a suitably shaped dust bay opening and a cylindrically shaped dust drawer. 
         [0112]    The dust collector  10  further includes wheels  82  for allowing the dust collector  10  to be portably wheeled to a desired location. 
         [0113]    The wheels  82  may be preferably represented by four swivelling caster wheels  84  with at least two having park break levers  86 . The caster wheels are attached in a spaced apart relationship along underside surface portions of the dust drawer unit  20 . 
         [0114]    In other embodiments, the wheels may be represented by a conventional hand dolly (not shown) that is attached to a side portion of the dust collector  10 . 
         [0115]    Thus, the dust collector  10  may be easily moved around and stably stationed on floors and through door frames of, for examples, residential houses, apartment blocks and work office buildings in construction. 
         [0116]    The dust collector  10  may be made of materials such as steel, aluminum, and plastic materials that are conventionally used in the manufacture of similar vacuum devices. 
         [0117]    Furthermore, the dust collector  10  has an overall dimension in height and at least one overall dimension in width that are suitably dimensioned for allowing the dust collector  10  to freely pass, in an upright attitude, through a conventionally sized door frame. 
         [0118]    As would be obvious to someone familiar with the art of industrial vacuum devices, the dust collector  10  of the present invention can be shaped and sized to suit the required capacity of a given vacuuming application. Furthermore, alternatively to the wheels  82 , the dust collector  10  may be attached to a stationary support structure such as a wall or floor for a more permanent installation. 
         [0119]    A preferred method of use of the dust collector  10  is substantially identical to the method of use of conventional vacuum units commonly found in industrial environments, construction sites, woodshops and the likes. 
         [0120]    Thus, the present invention provides a dust collector  10  for filtering dust laden air that is significantly more easily moved around through door frames of construction sites, is relatively more easy maintained due to its relatively simple assembly, as well as being relatively inexpensive to manufacture, when compared to known industrial dust collectors actually used on construction sites and the likes. 
         [0121]    Although the present invention has been described hereinabove by way of exemplary embodiments thereof, it will be readily appreciated that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. Accordingly, the scope of the claims should not be limited by the exemplary embodiments, but should be given the broadest interpretation consistent with the description as a whole. The present invention can thus be modified without departing from the spirit and nature of the subject invention as defined in the appended claims.