Chalkline tool

A casing for a chalk line dispenser, comprising a pair of casing elements which interfit and define a chamber for storing chalk powder and chalk line, said elements having base walls and sidewalls extending about the periphery thereof with interfitting surface portions along the ends thereof, the interfitting surface portion on said sidewall of one of said elements including a groove in the end surface of said sidewall extending about the periphery thereof intermediate its width to provide resiliently deflectable wall sections on either side thereof, and the interfitting surface portion on the sidewall of the other of said elements including a tongue on the end surface of the sidewall extending about the periphery thereof and seated in said groove of said one element, said tongue having a width greater than the width of said groove to deflect said wall sections and said tongue being firmly gripped by said resiliently deflectable wall sections to provide a seal therebetween, said casing elements being fabricated from synthetic resin, said tongue tapering to a reduced width towards its end, and said groove tapering to a reduced width at its base.