Abstract:
A dust director portable vacuum guard for mounting onto a bore of a portable angle grinder. The dust director includes a housing with parallel inner and outer walls and an end web adjacent to a straight barrel that is secured along aligned edges of the walls. The barrel is slotted from a forward dust collected end to the web and is stepped at a selected distance apart from the inner wall upper edge, functioning as a baffle. An attachment ring is pivotally mounted in the housing inner wall to releasably couple to an angle grinder bore and pivot around that bore upon release of a spring loaded thumb screw. An extension cover is included on an end of the housing to allow for sawing through a corner.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to dust containment guards for electrical and air tools, and in particular to a dust guard for mounting to an angle grinder, circular saw, or the like, that includes a vacuum port for connection to a vacuum hose to pull dust and materials as are generated by tool operation off of a work surface and collect them in a vacuum system 
     2. Prior Art 
     Electrical and air tools that incorporate turning blades or wheels for cutting or removing material off from a surface are, of course, well known, as are guards or shrouds for fitting onto a tool to separate an operators hands from a moving tool edge or surface. A common example of such arrangement is found in a skill saw where, when an operator, holding the saw by its handle, pushes the turning tool blade into a section of wood, and lifts a spring loaded shroud by contact with the section of wood edge. The shroud is thereby lifted onto, and travels along, the wood surface where the turning saw blade is cutting. Such guard arrangement is, of course, well known for use with skill saws, and where a skill saw, or a like saw has been used in a shop setting, such has often included a vacuum port for attachment onto a vacuum hose end for drawing dust, as is produced by the blade sawing action, off from the work surface, and with that dust then traveling into a vacuum system. 
     Angle grinders are, of course, tools that includes a turning blade, and are hand held by an operator. In practice, the operator holds an angle grinder handle and urges the turning blade edge against or into an item or surface, such as a block wall, to cut or saw into and across that item or surface. Such angle grinder mounts the blade to a drive shaft that is journaled through a bore whereto a guard or guards are fitted. In which arrangement, the drive shaft and bore are arranged at a right angle to the handle. In use, the turning blade generates a large amount of dust, for example, as when it is used to cut or saw into a wall, or the like. Where the angle grinder is used to cut or saw along a line drawn onto a wall surface, or the like, it is important that an operator be able to see the turning blade sawing edge so as to direct that sawing edge along the scribed line. Accordingly, it is desirable to provide an arrangement for removing dust as is generated in wall cutting operations that will not hinder an operators visibility of the turning blade sawing edge that is in contact with the that wall surface. Whereas, which arrangement still needs to provide proper positioning of the guard vacuum end so as to efficiently remove the sawed materials. 
     The invention is in a dust director meets the operators need to have a clear view of the turning blade edge while affording the operator with a view of the work surface. To meet these needs, the invention provides a dust director portable vacuum guard that connects a barrel portion to a vacuum hose where an opposite barrel end can be positioned for efficiently drawing dust and particles off from the wall, or other surface being cut or sawed. Further, the unique features of the invention include: an arrangement for mounting the dust director to an angle grinder by a use of an attachment ring that provides for fastening the dust director guard securely to the angle grinder&#39;s bore while allowing the dust director to be maintained in a swiveling or fixed cutting position, with the attachment ring, sized to be suitable for mounting onto a number of angle grinders, or like tools, as are currently being marketed; an extension cover that is pivotally attached to an open side of the dust director portable vacuum guard housing to be swung open to expose a side edge of the angle grinder blade to enable the cutting or sawing of an inside corner of a masonry wall: and an air baffle that is part of a barrel of the dust director guard that significantly increases the vacuum efficiency in a removal of grinder dust removal from the work surface. 
     BRIEF SUMMARY OF THE INVENTION 
     It is a principal object of the present invention to provide a light weight dust director portable vacuum guard for mounting onto a conventional angle grinder, or like tool, that will shield the turning tool blade while allowing the operator to see the work area and tool edge and is connected through a hose to a vacuum to draw materials as are produced by the turning tool blade off from the work surface. 
     Another object of the present invention is to provide a dust director portable vacuum guard that, when mounted onto a conventional angle grinder, or like tool, provides the operator with the ability to adjust the guard to their personal cutting styles, that is comfortably held by the operator and provides for an efficient dust removal off of a work surface. 
     Another object of the present invention is to provide a dust director portable vacuum guard arranged for mounting onto a number of commercially available angle grinders, or the like, so as to be capable of swiveling and, alternatively, can be fixed in position relative to a bore wherethrough a turning tool blade drive is journaled, allowing for guard pivoting between a first position where the angle grinder blade can be use to saw along a wall, and where the guard is freed to rotate allowing the blade to turn into and through a corner. 
     Another object of the present invention is to provide a dust director portable vacuum guard having an open tube as a vacuum barrel with a large attachment end for receiving a vacuum hose fitted thereover, facilitating high volume of suction, and includes a baffle for improving vacuum efficiency. 
     Still another object of the present invention is to provide a dust director portable vacuum guard that is configured to expose the turning blade edge and sides, giving an operator both good blade visibility and facilitating their guiding the turning blade along a line scribed over a surface and provides even for cutting or sawing into and out of a walls inside corner. 
     Still another object of the present invention is to provide a dust director portable vacuum guard with an extension cover arranged to cover the entire turning blade that is configured to allow a lifting of the extension cover when the blade is not turning, for cutting inside of a corner, with the extension cover then easily restored to its blade covering attitude after the corner cut is made. 
     Still another object of the present invention is to provide a dust director portable vacuum guard that allows pivoting of the angle grinder relative to the guard housing to allow the angle grinder blade to cut or saw into a wall inside corner, providing an operator with a blade shield that is easy to use and that provides cutting or sawing versatility. 
     Still another object of the present invention is to provide a dust director portable vacuum guard that is easy and quick to install onto a conventional portable angle grinder. 
     The present invention is in a dust director portable vacuum guard that includes a housing with an attachment ring for fitting onto a portable angle grinder, arranged for mounting onto a tool bore, preferably a portable angle grinder. To provide this mountings, the angle grinder cutting blade is first de-mounted from the angle grinder bore, as by turning a mounting bolt that fits through the blade center coupling opening into a drive and is journaled in the grinder bore. The dust director portable vacuum guard includes a grinder bore receiving, hole formed through an inner side wall wherein the attachment ring is pivotally mounted and is held in place by a spring loaded thumb screw. The dust director portable vacuum guard inner side wall is one of a pair of parallel inner and outer side walls that extend at right angles from junctions with a guard vacuum barrel and connect, along rear edges, to a back wall. The vacuum barrel is a straight tube that is arranged for connection, on an exhaust end, to a vacuum hose, and incorporated an air baffle as a component that provides for improved dust collection performance. 
     The dust director portable vacuum guard includes the attachment ring for mounting an angle grinder bore thereto and is releasable to allow rotation and is formed to couple to the bores of a number of commercially available angle grinders utilizing four equal spaced threaded screw holes. To mount the attachment ring to the angle grinder bore, for positioning the dust director guard at a desired angle to the angle grinder turning blade, two of the tour holes are selected to receive set screws turned therein. Re-positioning of the dust director portable vacuum guard on the angle grinder bore requires only a release of the set screws, a turning of the attachment ring to a desired location on the angle grinder bore, and a re-turning of the pair of set screw into the selected threaded screw holes to appropriately re-lock the dust director guard onto the angle grinder bore at the new, selected position. Further the guard also includes a spring loaded thumb screw located on the backside of the housing and is threaded for turning into the attachment ring, securing the attachment ring to the housing when it is turned therein, and, when turned out of the attachment ring, the attachment ring is allowed to pivot in its hole mounting in the inner wall. So arranged, release of the attachment ring to pivot, allows the operator to position the dust director portable vacuum guard appropriately to afford the operator with good visability of the angle grinder blade as it saws. Further, the thumb screw is spring loaded by fitting the threaded body thereof through a coil spring that is maintained to the screw head end undersurface and housing inner wall surface to maintain it in alignment with the hole through the housing inner wall 
     The dust director guard further includes an extension cover that, when unsnapped after the grinder is stopped, can be pivoted away from the grinder blade, allowing the blade to be turned into a wall corner, simultaneously cutting the wall on both sides of the corner and into the corner. Whereafter, the grinder is again turned off, the extension cover is snapped back into place, allowing forward cutting to be resumed. Also unique to the dust director guard of the invention, the dust director guide barrel includes an air baffle that channels a dust flow as is pulled off the work area under vacuum, passed into the barrel that directs that flow into a vacuum system. The baffle, in practice, provides for a greater volume of dust collection off of the work area than does an open barrel alone. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     In the drawings which illustrate that while is presently regarded as the best and preferred mode for carrying out the invention: 
     FIG. 1 is a side elevation perspective view taken from a rear and outer side of a dust director portable vacuum guard of the invention shown as including an attachment ring pivotally mounted in a housing inner wall hat is for attachment to a portable angle grinder bore and showing the dust director guard as including a straight open tube for fitting a vacuum hose thereover; 
     FIG. 2 is a view like FIG. 1 only showing an extension cover fitted over a butt end of the dust director portable vacuum guard that has one end released and the extension cover pivoted around a pivot coupling at its other end, opening the housing butt end; 
     FIG. 3 shows a sectional view taken along the line  3 — 3  of FIG. 1, showing a detent type closure of the extension cover end to the housing butt end; 
     FIG. 4 is a perspective view like that of FIG. 2 only taken from a forward end of the dust director portable vacuum guard showing the attachment ring and an end view of an air baffle arrangement that is a section of the barrel between the dust director guard side and barrel exhaust slot; 
     FIG. 5 is a front end view taken between the lines as  5 — 5  of FIG. 4, showing the barrel as open with the baffle arrangement shown on the left side thereof as a barrel section that terminates at the exhaust slot; 
     FIG. 6 is an enlarged end sectional view of the dust director guard of FIG. 1 mounted at its attachment ring to the bore of an angle grinder by a pair of set screws and showing a spring loaded thumb screw, with an angle grinder blade shown mounted onto a drive journaled through a bearing of the angle grinder, with a mounting bolt shown turned into a threaded mounting hole that is formed in the drive, and showing the blade turning alongside an edge of the baffle, as shown in FIGS. 4 and 5; 
     FIG. 7 is a side elevation view taken from the outer side of the dust director portable vacuum guard of FIGS. 1,  2  and  4  mounted onto a portable angle grinder, showing an angle grinder blade as turning counter clockwise, illustrate by arrow A, and showing, an angle grinder grip as having been positioned to extend forward of, and essentially parallel to, the guard barrel end; 
     FIG. 8 is a side elevation view like that of FIG. 7 only showing, in solid lines, the angle grinder grip as having been pivoted opposite to the direction of turning, arrow A, illustrating how the dust director guard can be pivoted relative to the attachment ring and connected angle grinder bore after the spring loaded thumb screw is released, and with the extension cover shown open; 
     FIG. 9 shows an operator using the angle grinder of FIG. 4 holding the dust director guard barrel in their left hand with the angle grinder grip held in their right hand, maintaining that grip, as shown, at a right angle attitude to the barrel, with the extension cover shown in a closed attitude, and with the edge of the angle grinder blade shown aligned to saw into a grout joint between bricks of a wall; 
     FIG. 10 is a view like that of FIG. 9 only showing the dust director guard barrel as having been pivoted to a position alongside of the angle grinder grip after release or un-threading of the spring loaded thumb screw, with the extension cover shown open allowing the angle grinder blade saw through a wall corner; 
     FIG. 11 is a bottom plan perspective view of the dust director portable vacuum guard with mounting the angle grinder, and with the angle grinder handle shown at a right angle to the barrel, and with the guard housing shown broken away above the attachment ring, showing the spring loaded thumb screw in its threaded attitude, locking the attachment ring in the guard housing, and showing, with a curved arrow, the thumb screw as being turned; and 
     FIG. 12 is a view like that of FIG. 11 only showing the spring loaded thumb screw as having been turned, un-threading it from the attachment ring, allowing the attachment ring and connected angle grinder to be turned through approximately ninety (90) degrees, and showing the thumb screw as retained to the inner wall outer face by a coil spring that the screw is fitted through. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The invention in a dust director portable vacuum guard  10  is shown alone in FIGS. 1,  2  and  4 , and is shown installed to a portable angle grinder  30  in FIGS. 6 through 12. Shown in FIGS. 1,  2  and  4 , the dust director portable vacuum guard  10 , hereinafter referred to as dust director  10 , includes, as an angle grinder mounting and turning housing  11 , hereinafter referred to as housing  11  that consists of pair of parallel inner and outer walls  12  and  13 . The inner and outer walls  12  and  13 , respectively, have rear edges  12   a  and  13   a , respectively, that are connected to parallel long sides of a rectangular end wall  14 . The forward area of the inner and outer walls,  12  and  13 , respectively are matched to inner and outer end walls  16  and  17  of an extension cover  15  that is open across a forward end and includes a rear wall  18  that is secured to the extension corner inner and outer end walls rear edges, forming a channel section that is coupled to ends of the outer walls  12  and  13  at like pivots  19 , above an open section. Which open section allows the extension cover  15  to be pivoted between the attitudes shown in FIGS. 1 and 2, and is maintained in a locked attitude by a detent lock  20 , shown in FIG. 3, and discussed in detail below. 
     The dust director  10  is open across the forward edges  12   b  and  13   b  of the inner and outer walls  12  and  13 , respectively. The outer wall  13  forward edges  13   b , as shown in FIGS. 1,  2  and  4 , are set well back from the inner wall  12  forward edge  12   b , with the inner wall  12  including an attachment ring  21  that is exposed between which inner and outer walls forward edges  12   b  and  13   b . The attachment ring  21  is for connection to an angle grinder and, as set out and described in detail below, and is arranged for connection to a number of angle grinders as are currently being marketed. 
     The dust director  10  housing  11  includes inner and outer walls  12  and  13 , respectively, that include top edges  12   c  and  13   c , respectively, that, as shown best in FIG. 5, connect, as by welding, into sides of a cylindrical tube or barrel  22 , hereinafter referred to as barrel  22 , that connects at a rear end  23  to a vacuum source that pulls a vacuum therethrough. Shown best in FIG. 5, the barrel  22  is open with the outer wall  13  joined or formed into the barrel right side wall, and with the inner wall  12  welded or otherwise connected along edge  12   c  to a left side of barrel  22 , providing a section of the barrel to an edge  25  that forms an air baffle  24 . Which air baffle  24 , in practice is approximately eleven sixteenths ({fraction (11/16)}) of an inch in width from joint  13   c , shown as a welded joint with the end of inner wall  13 , and is shown as a distance B in FIG.  5 . The air baffle  24 , as shown, extends to within approximately one (1) inch to the housing  11  inner bottom edge  12   b , angling outwardly at  27  at, approximately a forty five (45) degree angle to the barrel  22  forward edge  26 , providing a slot having a width of approximately thirteen sixteenth ({fraction (13/16)}) on an inch that extends to the housing end wall and wherein an angle grinder  30  blade  38  turns. Hence, the air baffle  24  is, in practice, an extension of the vacuum air hose, attaining a maximum suction at the barrel forward edge  26  that is, approximately, the vacuum as is present at a very end of a vacuum air intake. 
     The housing  11 , provides an open area within barrel  22  wherein an angle grinder blade  38  turns, as shown best in FIG. 6, that extends from the barrel edge  25 , that is the edge of baffle  24 , and the housing inner wall  12 , and to the barrel junction with the housing end wall  14 . In practice, as discussed hereinbelow relative to operation of the angle grinder  30  mounted to the dust director  10 , the air baffle  24  tends to maintain the vacuum draw that is pulled through barrel  22  to around the turning angle grinder  30  blade  38 , confining the vacuum pulling action to a work surface that the angle grinder is sawing along, as illustrated in FIGS. 9 and 10, thereby maximizing vacuum efficience to remove dust and particulates off of that work surface. 
     The open cylinder or tube forming the barrel  24  is straight and preferably has a diameter of approximately two (2) inches. A barrel rear end  23  is arranged for receiving a vacuum tube hose  29 , as shown in FIGS. 9 and 10, fitted thereover, and a barrel forward or work contacting end  26  is open and, as shown in the cross sectional view of FIG. 6, is immediately adjacent to the angle grinder blade  38 . The barrel  22  at end  26  is an extension of the inner wall  12 , through approximately one hundred eighty degrees of arc, and then curves inwardly at  27  to the barrel edge  26 , providing an open area at the barrel end  26  wherethrough an operator can observe the turning angle grinder blade  38  as it is guided along a work surface, as illustrated in FIGS. 7 and 8. 
     As set out above, the area between the housing inner wall  12  forward edge  12   b  and the housing outer wall forward edge  13   b  is open to receive angle grinder  30  that is mounted at its bore  31  to the attachment ring  21 . The attachment ring  21  is fitted to turn in a hole formed in the inner wall  12 , as shown best in FIG.  6  and in FIGS. 1,  2 , and  4 , and is intended to function as a universal angle grinder mounting to accommodate the mounting to the housing  11  of a number of commercially most popular angle grinders. To provide this universal mounting, the dust director  10  attachment ring  21  includes four equal spaced threaded set screw holes  35  that can each receive a machine set screw  36  turned therethrough. In practice, to mount a particular angle grinder  30  to the attachment ring  21 , two of the set screw holes  35  are selected to match spaced depressions or a groove formed in the bore of a particular selected angle grinder, as illustrated by the angle grinder  30  and its bore  31 . The screws  36 , are shown as set screws, and are turned into through the selected set screw holes  35  into the depressions or a groove, locking the angle grinder to the attachment ring  21 , as illustrated in FIG.  6 . Which set screw holes  35 , as illustrated in FIGS. 1 and 2, are preferably spaced at equal intervals around an open short cylinder  37  of the attachment ring, with the selected set screw holes  35 , that receive the set screws  36 , are preferably selected to be across from one another, for locking the angle grinder  30  bore  31  to the attachment ring  21 . 
     To provide an operator with a capability for rotating the housing  11  relative to the angle grinder blade  38  for a particular work situation, the attachment ring  21 , by a spring biased thumb screw  40 , hereinafter referred to as thumb screw, is releasable from its connection to the housing inner wall  12 , allowing rotation of the attachment ring  21  and mounted bore  31  within the hole formed in the inner wall  12 . The thumb screw  40 , shown best in FIG.  6  and in FIGS. 11 and 12, is arranged for turning through a back side, or side away from the mounted angle grinder, and housing inner wall  12 , to pass through a hole  43  formed through which inner wall for turning in a nut for threaded portion  42  that is formed in or secured to an outer surface of a tab  39   a  portion of a right angle flat flange  39  of the attachment ring  21 . The thumb screw  40  includes a broad flat head end  44  and threaded body  45 , with the broad head  44  including a slot thereacross for receiving a screw driver blade, and also can be turned manually by an operator to who grips a head end  44 , at a knurled outer edge surface, between their fingers. 
     In practice, the angle grinder bore  31  is secured, as described above, by set screws  36  that are passed through the attachment ring  21  and into holes, a slot, detents, or the like, that are formed in the bore  31 . So arranged, the attachment ring  21  is free to rotate until it is fixed in placed by an operator turning the thumb screw  40  body  45  through the inner wall  12  hole  43  and into the nut or threaded portion  42  of tab  39   a , coupling the attachment ring  21  and angle grinder bore  31  to the inner wall  12 . Should, however, the operator wish to release the coupling that is provided by the thumb screw  40 , the thumb screw head end  44  is turned to turn the thumb screw body  45  out of the nut or threaded portion  42 , as shown by an arrow  44 B on FIG. 11, until the thumb screw body end passes out from the inner wall  12  nut or threaded portion  42 , releasing the connected attachment ring  21 , allowing it and the angle ringer bore  31  to turn in the inner wall  12  hole  43 . For maintaining the screw body  45  in alignment with the hole through the inner wall  12  after release from the nut or threaded portion, the screw body  45  is fitted through a coil spring  46  whose end is maintained to a washer  47  that is fixed to the inner wall surface at the inner wall hole  43 , as by welding it onto the edge of inner wall hole  43 . The coil spring  46  is thereby retained between the undersurface of thumb screw head  44  and washer  47 , aligning the end of screw body  45  with the inner wall hole  43  after the tube screw  40  is turned out of the nut or threaded portion  42  of the attachment ring tab  39   a , as shown in FIG.  12 . The attachment ring  21  is thereby free to rotate within its mounting in the inner wall  13  hole. With a re-coupling of the attachment ring  21  requiring only an operator pushing on the bolt head end  44  to compress the coil spring and urge the bolt  40  threaded end  45  into the nut or threaded hole  42  to re-secure the attachment ring to the housing inner wall  12 , shown in FIGS. 1,  2 ,  4 ,  6  and  11 . 
     Shown in FIG. 6, the angle grinder  30  includes the bore  31  whereto the attachment ring  21  is mounted that, as shown includes roller bearings  50 . The roller bearings  50  are shown maintained in a track  51  that engage the surface of a drive shaft  52  whereon the blade  38  is mounted between inner and outer mounting plates  53   a  and  53   b , respectively. The mounting plates  53   a  and  53   b  are urged together with the blade  38  therebetween by turning a nut  54  onto a threaded end of the drive shaft  52 . Which drive shaft is shown as having been turned through an inner nut  55  that engages an outer surface of a washer  56  whose inner surface is engagement with the side of bearing race  51 . So arranged, the angle grinder bore  31  is mounted to the attachment ring  21  so as to be both rigidly fixed thereto by set screws  36 . The attachment ring  21  is allowed to rotate in its inner wall  13  mounting upon release of the thumb screw  40 , as set out above, to afford an operator the flexibility to position the dust director  10  in relation to the angle grinder  30  to allow an operator to cut through a corner, accommodating the operators cutting or sawing needs. 
     Dust director  10  pivoting relative to the angle grinder  30  is allowed by the release of the attachment ring  21 , as set out above, allowing the operator to position the angle grinder handle  60 , that they hold in one hand, appropriately for the cutting task involved, from sawing along a wall joint and through a corner, such as a cement joint between bricks, as shown in FIGS. 7 through 12. To saw into and through a corner, as shown in FIG. 10, with the attachment ring  21  released, as shown in FIG. 12, the operator holds a vacuum hose  29  fitted onto the barrel  22  end  23  in their left hand and with handle  60  of the angle grinder  30  held in their right hand, and with the barrel  22  end  26  held close to the wall surface wherein the blade  39  is cutting. As the turning angle grinder  30  blade  39  approaches the corner, shown in FIGS. 8 and 10, the angle grinder handle  60 , is moved from the position shown in FIGS. 7,  9  and  12 , through the attitude shown in broken lines in FIG. 8, to the attitude shown in FIGS. 10 and 12 to be approximately parallel to the barrel  22 . Additionally, for cutting through a wall corner, with the angle grinder turned off, the extension cover  15  detent coupling  20  is released, and the extension cover is pivot around its pivot coupling, as shown in FIGS. 8 and 10, thereby opening area between inner and outer walls  12  and  13  below the pivots  19 , the extension cover  15  pivoting to where a rear edge of a web  18  between sides  16  and  17  of the extension cover  15  engages the housing rear wall  14 . Open the extension cover to the attitude shown in FIG. 8 allows the operator to better see and guide the angle grinder turning blade  38  through a wall corner, as shown in FIG.  10 . Shown best in FIG. 3, the detent coupling  29  includes a protrusion  29   a  that extends inwardly from the extension cover  15  inner wall to fit into a hole  29   b  that is formed through the housing inner wall  13 . The protrusion  29   a  will travel into, to snap in and be held in, the hole  29   b , when the extension cover is manually pivoted around pivots  19 , and is disengaged out from hole  29   b  when an operator, with their fingers, pulls the extension cover  15  away from the inner wall  13  lower edge. Accordingly, to cut around a corner like that shown in FIG. 10, the operator stops the angle grinder  30  and pulls the extension cover  15  lower end and the lower edge of extension cover rear wall  18 . The extension cover  15  easily snaps out of covering engagement between the lower edges of the housing inner and outer walls  13  and  14 , allowing the angle grinder blade to cut through corners, and like inwardly angled sections of a wall. In which cutting operation, an operator appropriately pivots the angle grinder handle  60  and maintains the barrel end  26  proximate to the work surface that is being sawed. 
     For sawing a wall like that shown in FIGS. 9 and 10, the blade  38  will preferably have a diamond or hard metal cutting edge  38   a . As described above, by appropriate pivoting of the angle grinder handle  60  relative to the guard  10 , after release of the thumb screw  40 , between the attitudes shown in FIGS. 9 through 12, and by appropriate pivoting of the extension cover  15  between open and closed attitudes, the operator can maintain a view of, and effectively guide the turning blade  38  cutting edge  38   a , across and around a work surface, like that shown in FIGS. 9 and 10. In which sawing operations., as shown in FIGS. 9 and 10, the operator maintains the barrel  22  work contacting end  26  close to the work surface. Which barrel  22  provides, with its air baffle  24 , as set out and described above, for an improved suction. Which air baffle  24  extends into the barrel  22  to its barrel edge  25  a distance B from the outer wall surface, and is proximate to the turning angle grinder blade  38 . Thereby, a vacuum pulled through the barrel from end  26  lifts materials off of a work surface, such as a masonry wall that is being sawed by the angle grinder blade turning in a counter-clockwise direction as indicated by arrows A in FIGS. 7 and 8 and arrow R 1  in FIG.  12 . In which vacuuming, the materials pulled by the vacuum are channeled past the barrel forward edge  26  that condenses the flow and limits turbulence. The baffle  24  thereby provides optimum suction at the turning blade  38  cutting edge, greatly improving the dust removal capability over a barrel without a baffle arrangement. In practice, use of the dust director  10  of the invention eliminates practically all dangerous dust and particulates from the work area. 
     Hereinabove has been set out a description of a preferred embodiment of a dust director portable vacuum guard of the invention, and while a preferred embodiment thereof had been shown and described herein, it should be understood that the invention can be modified within the scope of the present disclosure without departing from the subject matter coming within the scope of the following claims, and a reasonable equivalency thereof, which claims  1  regard as my invention.