Patent Publication Number: US-4733477-A

Title: Chalk line framing square

Description:
BACKGROUND OF THE INVENTION 
     The instant invention relates generally to guide tools and more specifically it relates to a chalk line framing square. 
     Numerous guide tools have been provided in prior art that are adapted to contain notches thereon to measure various sized items. For example, U.S. Pat. Nos. 848,399; 1,553,229 and 3,797,122 all are illustrative of such prior art. While these units may be suitable for the particular purpose to which they address, they would not be as suitable for the purposes of the present invention as heretofore described. 
     SUMMARY OF THE INVENTION 
     A primary object of the present invention is to provide a chalk line framing square that will overcome the shortcomings of the prior art devices. 
     Another object is to provide a chalk line framing square that is so designed to aid in placing right angle intersecting chalk lines upon a floor so that tiles can be properly installed on the floor. 
     An additional object is to provide a chalk line framing square that is so designed to check the squareness of the tiles as they are installed with adhesive without placing the tool in the adhesive. 
     A further object is to provide a chalk line framing square that is simple and easy to use. 
     A still further object is to provide a chalk line framing square that is economical in cost to manufacture. 
     Further objects of the invention will appear as the description proceeds. 
     To the accomplishment of the above and related objects, this invention may be embodied in the form illustrated in the accompanying drawings, attention being called to the fact, however, that the drawings are illustrative only, and that changes may be made in the specific construction illustrated and described within the scope of the appended claims. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING FIGURES 
     FIG. 1 is a top plan view of the invention. 
     FIG. 2 is a side view taken in direction of arrow 2 in FIG. 1. 
     FIG. 3 is a top plan view of a modification showing an adjustable framing square to change angles of arms thereof. 
     FIG. 4 is an enlarged cross sectional view taken along line 4--4 in FIG. 3 showing the pivot with set screw in greater detail. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Turning now descriptively to the drawings, in which similar reference characters denote similar elements throughout the several views, FIGS. 1 and 2 illustrate a chalk line framing square 10 for a floor having tiles installed thereon with adhesive. The framing square 10 consists of a pair of arms 12 at right angles. Each of the arms 12 have a pair of spaced apart notches 14 that are V-shaped and formed on outer edge 16 thereof to act as view points for enabling visual alignment of the arms 12 for laying out right angle intersecting chalk lines upon the floor, so that the tiles can be properly installed with the adhesive to the floor. 
     A pair of handles 18 are also provided. Each of the handles 18 is affixed to top 20 of each of the arms 12 to allow a person to hold the framing square 10 to check squareness of the tiles without laying the framing square in the adhesive. 
     FIGS. 3 and 4 show a modified chalk line framing square 10a wherein the arms 12a, the notches 14a and the handles 18a are pivotly adjustable for laying out chalk lines so that walls in a building can be installed, since many walls are not built at right angles. One arm 12a has a pivotable end portion 22 with degree markings 24 thereon. Other arm 12a has a pivotable end portion 26 with a pointer 28 thereon. The pivotable end portion 26 is in an overlap flush relationship with pivotable end portion 22 of the first arm 12a. A set screw 30 extends through the end portions 22, 26 of the arms 12a so as to lock the arms in any desired angle needed. 
     Each of the notches 14a is in a curved portion 32 with degree markings 34 thereon, within each of the arms 12a having a curved cut out portion 36 with a pointer 38 thereon. The notches 14a can be turned to same angle as the arms 12a. Each of the handles 18a is affixed at one end 40 to a circular portion 42 within each of the arms 12a having a circular hole 44. The handles 18a can be turned to properly position the framing square 10a with respect to angle of the arms 12a and the notches 14a. The framing square 10a further contains a pair of level bubbles 46, each of which are affixed to top ends of each of the arms 12a to aid a person in keeping the framing square 10a level when being used. 
     While certain novel features of this invention have been shown and described and are pointed out in the annexed claims, it will be understood that various omissions, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing from the spirit of the invention.