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An adapter having particular application to quickly and easily convert a portable worm driven circular power saw into a sprocket driven chain saw. The adapter comprises an adjustable compression ring portion which is adapted to be attached to the existing bearing plate of the circular saw without re

An adapter having particular application to quickly and easily convert a portable worm driven circular power saw into a sprocket driven chain saw. The adapter comprises an adjustable compression ring portion which is adapted to be attached to the existing bearing plate of the circular saw without requiring a removal of the bearing plate. Coextensively formed with the adapter compression ring portion is a base portion having a structure which permits a cutting chain bar and a cutting chain safety guard to be connected to opposite faces of the base portion. Thus, a circular cutting blade may be replaced by a cutting chain, and vice versa, without removing the existing bearing plate, as is commonly required when a conventional converison apparatus is utilized.

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For a portable power driven circular saw including a housing, a rotor from which the circular saw blade has been removed, and a bearing plate connected within said housing and having a race extending outwardly therefrom for defining an opening in said plate through which said rotor extends, the impr

For a portable power driven circular saw including a housing, a rotor from which the circular saw blade has been removed, and a bearing plate connected within said housing and having a race extending outwardly therefrom for defining an opening in said plate through which said rotor extends, the improvement of an attachment device for converting the circular saw to a chain saw, said attachment device having a first end to be connected to said bearing plate and an opening in said first end through which a sprocket drive can be interconnected to said rotor for engaging a cutting chain, the first end of said device including a pair of legs arranged in spaced alignment with one another to define a gap therebetween and means by which to move said legs relative to one another to vary the size of said gap, the size of the opening in said first end being controlled by the size of said gap for receiving through said opening the race of said bearing plate, said attachment device having a second end to be connected to a chain bar to receive the cutting chain therearound and maintain said cutting chain in engagement with said sprocket drive.