Patent Publication Number: US-4096021-A

Title: Hand held masking machine

Description:
BACKGROUND OF THE INVENTION 
     The prior art contains hand held masking machines which apply adhesive tape and paper to a surface being masked, and these machines employ an applicator roller which frictionally dispenses the tape and paper from the machine as the said roller presses the paper onto the surface to be masked. Accordingly, prior art machines are substantially more complicated than required for efficient masking operations and such machines require the application of a substantial amount of manual force in the operation thereof. Additionally, prior art machines have been relatively bulky and heavy and have also required pressure rollers for pressing the adhesive tape securely into contact with the masking paper as it is dispensed from a roll on the machine. Additionally, various prior art machines have required complicated procedures to thread the paper and the tape through the machine, such as to be in a position for application of the tape and paper to form a mask adjacent to an area to be painted. 
     SUMMARY OF THE INVENTION 
     The present invention is provided with a unitary frame which supports a tape roll holder and a paper roll holder; an end portion of the tape roll holder being in overlapped relationship with an end of the paper roll holder such that tape dispensed from a roll of tape on the tape roll holder will overlap and extend beyond the edge of the paper dispensed from the paper roll holder. The tape roll holder is disposed such that adhesive tension of the tape being pulled from the periphery of the roll of tape causes the tape to be dispensed in adhesive pressure relationship over the periphery of the roll of paper on the paper roll holder as the paper and tape then passes from the area of the paper roll holder under a guide bar which is used for wiping and pressing the adhesive tape carrying the paper onto a surface being masked. The machine is provided with a unitary frame having forward and rearward portions and a manually engageable handle is provided with a longitudinal axis which is disposed at substantially right angles to the axes of the tape roll holder and the paper roll holder of the machine and spaced therefrom such that the longitudinal axis of the handle is disposed substantially at right angles to the axis of the paper roll holder and intersects the paper roll holder or the roll or paper between its opposite ends; the handle being provided with a free end which extends toward the rearward portion of the frame and the paper guide bar of the machine is mounted on the forward portions and substantially coextensive with the length of the roll of paper on the paper roll holder. 
     The longitudinal axis of the elongated handle is disposed preferably at right angles to the rotary axis of the paper roll holder and to the longitudinal axis of the guide bar, and is so disposed so that the handle may exert pressure generally in a median area with relation to opposite ends of the roll of paper so as to provide a stable operation of the machine as paper and tape are dispensed therefrom and during a time when the tape is being adhesively wiped onto a surface by means of the guide bar of the machine. 
     The machine is provided with a tensioning device which is resiliently loaded against the periphery of the roll of paper and insures even dispensation thereof in cooperation with the dispensation of tape from the roll of tape on the tape roll holder of the machine. 
     The guide bar is provided with a cutting edge directed forwardly relative to the forward portion of the frame of the machine, and the cutting edge is preferably a generally saw tooth shaped serrated edge adapted readily to cut or tear tape and paper at the forward edge of the guide bar after a desired area of a surface to be masked has been traversed and onto which paper and tape has been applied. 
     The guide bar is adjustably moveable longitudinally relative to the frame and fixable in various positions such that it extends varying distances beyond the end of the roll of paper at which the tape is applied. Whereby, tape of varying widths may be adhesively applied to the edge of the paper dispensed from the roll of paper and whereby the guide bar is coextensive to the extending edge of the tape even though it may be of various widths as desired for adhering to various surfaces for holding the paper adjacent thereto. 
     Accordingly, it is an object of the invention to provide a hand held masking machine which is of light weight and which is very compact and easy to operate. 
     Another object of the invention is to provide a hand held masking machine which readily dispenses paper and tape adhesively secured together without the need of pressure rollers for pressing the tape onto the paper and for pressing the paper and tape onto a surface being masked. 
     Another object of the invention is to provide a hand held masking machine which is very simple to load with paper and tape and which does not require complicated operations to thread the paper and tape through the machine is position for application of the paper and tape to a surface being masked. 
     Another object of the invention is to provide a hand held masking machine which is very rapid in use and which is therefore capable of masking large areas with a minimum of manual labor time. 
     Another object of the invention is to provide a hand held masking machine which is readily and easily loaded with paper and tape and which dispenses paper and tape adhesively secured together in such a manner that the tape, when adhesively engaged with a surface to be masked, will provide sufficient holding of the tape and paper on said surface such that tension applied to the paper and tape will unroll and dispense further tape and paper from the masking machine of the invention as the frame of the machine is drawn away from the area to which the tape is initially adhesively secured. 
     Further objects and advantages of the invention may be apparent from the following specification, appended claims and accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a side elevational view of the hand held masking machine of the invention; 
     FIG. 2 is a view taken from the line 2--2 of FIG. 1; 
     FIG. 3 is a perspective view of the hand held masking machine of the invention shown dispensing paper and tape onto a surface being masked and such that the tape is adhesively secured to the surface and provides sufficient holding force to unroll and dispense further amounts of paper and tape onto said surface; 
     FIG. 4 is a side elevational view of the hand held masking machine of the invention taken from the line 4--4 of FIG. 3; 
     FIG. 5 is an enlarged sectional view taken from the line 5--5 of FIG. 1 showing portions of the machine fragmentarily; 
     FIG. 6 is an enlarged fragmentary sectional view taken from the line 6--6 of FIG. 4; 
     FIG. 7 is a fragmentary sectional view taken from the line 7--7 of FIG. 6; 
     FIG. 8 is a perspective view of the paper guide bar of the machine of the invention; and 
     FIG. 9 is an enlarged end view of the guide bar shown in FIG. 8 and illustrating varying positions of the guide bar relative to the frame for removing and adjusting the position of the guide bar relative to said frame. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The hand held masking machine of the invention, as shown in FIGS. 1-4 inclusive, is provided with a frame 10 having a substantially flat frame section 12, shown best in FIG. 2 of the drawings. Integral with this section 12 is an offset bracket portion 14 carrying a handle 16 which is an elongated handle having a longitudinal axis 18 which is substantially parallel to the flat portion 12 of the frame 10. 
     Carried on the flat portion 12 of the frame 10, as shown best in FIG. 5, is an integral spindle 20 on which is rotatably mounted a generally circular tape roll holder 22. This roll holder 22 is retained on the spindle 20 by means of a washer 24 and a screw 26 which is threaded into the spindle 20. 
     Shown mounted on the tape roll holder in FIG. 5 is a roll of tape 28. This roll of tape 28 is shown in section. The spindle 20 provides a rotary axis support for the tape roll holder 22 and this axis is designated 30 in FIG. 5 of the drawings and is concentric with the screw 26. Thus, the rotary axis 30 of the tape roll holder 22 is at substantially right angles to the flat frame portion 12 of the machine. 
     As shown in FIG. 6 of the drawings, a paper roll holder 34 is rotatably mounted on a spindle 36 which is connected to or integral with an offset portion 38 of the frame 10; the spindle 36 being provided with a longitudinal axis 40 which constitutes the rotary axis of the paper roll holder 34 and this paper roll holder 34 is a hollow cylindrical member rotatably mounted on the spindle 36 and retained thereon by a washer 42 and a screw 44, which is threaded into the end of the spindle 36. 
     The offset portion 38 of the frame 10 is provided with an integral portion 46 and this portion 46 is integral with the hereinbefore described flat portion 12 of the frame such as to provide an offset relationship of the roll of tape 28 and an end portion 48 of a roll of paper which is carried on the paper roll holder 36. This roll of paper is designated 50 in the drawings, and is a roll of expendable masking paper. 
     The paper roll holder 34, as shown in FIG. 6, is provided with an end portion 52 adjacent the offset frame portion 38. This end portion 52 of the paper roll holder is disposed in overlapping relationship with an end 54 of the tape roll holder which is adjacent to the flat portion 12 of the frame 10, so that tape dispensed from the tape roll holder and from the roll 28 thereon overlaps the ends 48 of the roll of paper and the edge of the paper so as to adhesively secure the tape to the paper and to allow a portion of the adhesive side of the tape to extend beyond the edge of the paper or the end of the roll 50 of paper. Thus, this adhesive portion extending beyond the end or the edge of the roll of paper is adapted to be adhesively engaged with a surface being masked such as the surface 56 shown in FIG. 1 of the drawings or the surface 58 shown in FIG. 3 of the drawings. It will be seen that the roll of paper 50 is provided with an end 60 opposite to the end 48 and that the longitudinal axis of the handle 16 is disposed at substantially right angles to the rotary axis 40 of the paper roll holder and thus the axis 18, being offset from the flat portion 12 of the frame, disposes the axis of the handle in a position substantially intersecting the rotary axis of the paper holder 40 at right angles and in a position between said opposite ends 48 and 60 of the roll of paper 50. The end portion 52 of the paper roll holder 34 may be considered to be the first end and an end portion 62 may be considered to be the second end of the paper roll holder 34. Said frame 10, as shown in FIGS. 2 and 4, is provided with a rearward portion 64 and a forward portion 66. 
     Said handle 16 is provided with a rearwardly extending end 68 which extends toward said rearward portion 64 of said frame so that the frame, during operation, may be pulled backwardly in the direction of the arrow A in FIG. 4 of the drawings during the application of masking tape and paper to a surface being masked as will be hereinafter described in detail. 
     A paper tension spring 69 is mounted on said frame 10 at one side of its flat portion 12 next to and below the handle 16. This spring is provided with a coil portion 70 which bears on a peripheral portion 72 of the roll of paper 50; thus insuring the even movement of the roll of paper and insuring that it does not become inadvertently unrolled. 
     The tape roll holder 22 is provided with arcuate ribs 74 which extend radially outward to frictionally hold a cardboard or other sleeve member 76 on which the roll of tape 28 is carried. Likewise, the paper roll holder 34 is provided with radially extending arcuate ribs 78, as shown in FIG. 7. These ribs 78 engage a cardboard cylindrical core 80 of the roll of paper 50 for frictionally retaining the roll of paper 50 on the paper roll holder 54 during operation. 
     Mounted on the forward portion 66 of the frame 10 is a guide bar 82. This guide bar 82 is shown best in FIGS. 1, 8 and 9. This guide bar is elongated and substantially coextensive with the roll of paper from its end 48 to its end 60, as shown in FIG. 2 of the drawings. The guide bar 82 is removeably connected to the forward portion 66 of the frame 10. The frame 10 is provided with a convex arcuate portion 84 around which a conforming portion 86 of the guide bar is engaged. The guide bar is provided with an angular hook portion 88 which hooks over a ledge 90 adjacent to the arcuate portion 86 and a projecting detent portion 92 integral with the forward portion 66 of the frame projects through any one of a plurality of openings 94 in the guide bar 82. The holes are so disposed that tension of the portion 86 of the guide bar 82 is caused when one of the openings 94 is forced over the projection 92. This frictionally holds the guide bar 82 in firm engaged relationship with the arcuate portion 84 of the front portion 66 of the frame 10. 
     The openings 94 are spaced apart; as for example they are spaced equal to three quarters of an inch, one inch, one and a half inches and two inches, which correspond to the widths of tape which may be on the roll of tape 28. Thus, the guide bar 82 may be adjusted such that any one of the holes 94 is over the projection 92 and holding the respective end 96 of the guide bar in appropriately spaced relationship with the end 48 of the roll of paper 50 so as to provide for the respective overlap of the adhesive tape relative to the edge of paper dispensed from the roll 50 at its end 48. 
     The double ended arrow 98 in FIG. 2 of the drawings represents the amount of overlap of the adhesive portion of the tape beyond the edge of the paper or the end 48 of the roll 50, and this portion of the tape which overlaps the edge of the paper extends the distance 98 beyond the paper and is thus exposed to adhesive engagement with the surface 56 as shown in FIG. 1 of the drawings. 
     As the end of the guide bar 82 is adjusted in the direction of an arrow C in FIG. 2 of the drawings by the use of the openings 94 and the projection 92, the amount of adhesive surface of the tape is extended so that an extended adhesive surface area may be attained for use in holding the paper 50 on a surface, depending upon the surface and its ability to retain the adhesive tape. 
     As shown in FIG. 1 of the drawings, the adhesive tape is pulled in the direction of an arrow D from the periphery 100 of the roll of tape 28. The tape adhesively resists removal from the roll at a location 102 such that the alignment of the tape is drawn over the periphery of the roll of paper at 104, and then the tape is adhesively secured to the paper. The tape, in the position shown in FIG. 1 at 106, is adhesively secured to a portion of the paper at 108, and the curved portion of the guide bar which is wrapped around the curved portion 84 of the frame 66 bears against the paper and tape at 110 forcing it onto the surface 56 and thus wiping it such that the adhesive side of the tape at 111 is adhesively secured to the surface 56. 
     In operation, the paper and tape is extended to the position shown in FIG. 1 of the drawings under the arcuate surface 112 of the guide bar, and the tape is adhesively secured to the surface 56. Subsequently, the frame is moved by manual force on the handle 16 in the direction of the arrow A, shown in FIG. 4 of the drawings and also shown in FIG. 1 of the drawings. Whereby, tension on the tape and the paper dispenses the tape and paper from the rolls of tape and paper carried by the machine and, when the area desired to be masked has been reached, a cutting edge 116 of the guide bar 82 is utilized to cut off the tape and the paper. This cutting edge is composed of a series of spaced saw tooth like portions 118 which very efficiently cut and tear the paper and tape with a simple tilting motion of the handle 16 so as to force the cutting edge 116 into engagement with the paper and the tape. 
     It will be obvious to those skilled in the art that various modifications may be resorted to without departing from the spirit of the invention.