Abstract:
A combination measuring, marking and cutting tool comprising a housing, a measuring tape extendable from the housing, a ferrule attached to the free end of the measuring tape, an aperture formed in the ferrule, and a T-shaped pivot tab secured to the housing in proximity to the measuring tape.

Description:
BACKGROUND OF THE INVENTION 
     In the construction industry, there is a recurring need for measuring, marking and cutting tools for use in connection with planar materials such as plasterboard. In practice, there are individual tools available which accomplish the various tasks required to mark, cut and finish a sheet of material. The problem lies in the fact that the requirement to use various individual tools is cumbersome and time consuming by the user to finish the particular task at hand. 
     BRIEF SUMMARY OF THE INVENTION 
     By this invention, a combination measuring, marking and cutting tool is provided and comprises a tape measure extendible from a housing, a pivot tab extending downwardly from the housing, a ferrule secured to the end of the tape measure remote from the housing, and an aperture formed in the ferrule. 
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
     In the drawings: 
     FIG. 1 is a perspective view of the combination tool according to this invention; 
     FIG. 2 is a perspective view showing use of the combination tool in connection with plasterboard; 
     FIG. 3 is an enlarged plan view of the end of the tape measure; 
     FIG. 4 is a perspective view of a modification of the tool; and 
     FIG. 5 is an enlarged elevational view of the modified version of the invention shown in FIG.  4 . 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     In the drawings and with particular reference to FIG. 1, the numeral  1  designates a conventional tape measure which is retractable into housing  2 , as is well known. Thumb tab  3  allows, in one position, for the extension of tape measure  1  and, in the other position, for the stoppage of extended tape measure  1  at any desired position. 
     According to this invention, T-shaped pivot tab  4  is secured to the lower edge of housing  2 , as best shown in FIGS. 1 and 4. Leaf spring  5  is secured to the bottom wall of housing  2  remote from the T-shaped pivot tab  4 , the free end of which is substantially adjacent the rounded tip of T-shaped pivot tab  4 . 
     Also, according to this invention, ferrule  6  is secured to the end of tape measure  1  by means of tab  7 , as best shown in FIG. 3, and aperture  8  is formed in ferrule  6 . Further, wall  9  extends upwardly from one side of ferrule  6  and wall  10  extends downwardly from the opposite side of ferrule  6 . Ferrule  6  can be magnetized, as desired, such as by means of attaching magnet  6   a  to wall  10 . 
     For ease of use, thumb indentation  11  is formed on one side of the housing  2  and finger indentations  12 ,  13  and  14  are formed on the opposite side of housing  2 . Also, belt chip  15  is provided for the purpose of storage on the user&#39;s belt. 
     In operation, when using plasterboard in the construction typically of walls and ceilings, it is essential that a perfectly straight edge be achieved in order to provide uniform joints between adjacent sheets of board such that the seams are virtually invisible in the finished wall or ceiling. In order to achieve this result by means of applicant&#39;s invention, plasterboard is first rough cut to the required dimensions as shown in FIG. 2 whereby housing  2  is positioned such that T-shaped pivot tab  4  is disposed in abutting relationship with one edge of plasterboard  16 . Then tape measure  1  is extended outwardly to the desired length and knife  17  is inserted through aperture  8  and then maneuvered to cut the plasterboard along edge  18 . Following this wall  10  is positioned to overlap edge  18  of plasterboard  16 . Then knife  17  is inserted through aperture  8  and the entire device is simply caused to slide along opposite edges  18  and  19  of plasterboard  16  so that knife  17  provides a perfectly straight cut along edge  18 . 
     If it is desired to measure or mark a circle on plasterboard  16 , housing  2  is placed on top of plasterboard  16  whereby rounded pivot tab  4  is placed on the desired point of pivot. Then pencil  20  is inserted through aperture  8  and ferrule  6  is rotated in a circle around pivot tab  4  which results in the marking of a perfectly round circle shape. Leaf spring  5  is provided in order to prevent debris from accumulating around T-shaped pivot tab  4 . 
     A modification of the invention is shown in FIGS. 4 and 5 wherein H-shaped water level  21  is secured to the upper curved surface of the housing  2 . In addition, protractor  22  is rotatably affixed to one side of housing  4  by means of pivot pin  23 . Therefore, when it is desired to make a level determination, housing  2  is placed on a planar surface with T-shaped tab  4  overlapping adjacent the edge thereof and with leaf spring  5  compressed into a flat planar relationship with the lower surface of housing  2 . By this means, an accurate level reading can be made. 
     When it is desired to make an angle determination, protractor  22  is simply swung out of a position in flat face contacting relationship with the side wall of housing  2  and into the position shown in FIG.  5 . The outwardly extending portion of protractor  22  is then simply positioned on an appropriate planar surface in order to make the required angle determination. 
     Therefore, by this invention, a combination tool is provided whereby sharp and precise cuts can be made to the edges of a planar sheet of construction material such as plasterboard. In addition, perfectly round circles can be drawn on the surface of the material with level and angular determinations achieved as desired.