Mold for making frusto-conical plugs

In a mold having at least one hollow truncated conical member having an upper open end with an outer rim and a bottom closed end adapted to be used to manufacture at least one plug of bituminous material for road repair, the improvement which comprises an upper, open end of each conical member, said upper end having a smaller cross-sectional area than the bottom end, said bottom end being closed with a smooth, readily detachable base plate and which is adapted to form a plug having a smooth upper end of larger cross-sectional area than the bottom end of said plug, said mold having a top plate with at least one opening of the same shape and area as the outer rim of the upper end of the truncated conical member, the said upper end of said conical member being secured to the said top plate adjacent the said rim so that the area of the upper open end of said truncated conical member is not diminished by said top plate, and the top plate is provided with a lip on the periphery of its upper surface so that when the hollow truncated conical member is slightly overfilled with molten bituminous material, said material will be contained on said top plate's upper surface, and said lip has a portion detachable therefrom to facilitate removal of excess bituminous material from the top plate by mechanical means, said mold being provided with a bottom plate spaced from, and connected to, said top plate by spacing and connecting means, having at least one openings conforming in position, area and shape with the bottom larger end of the hollow truncated conical member, said bottom plate being detachably secured to the smooth base plate.