Self adjusting brush arm assembly

Claim 1

In a pipe cleaning machine, in combination, a sprocket having an opening for the passage of a pipe therethrough and with at least a first and second brush arm assembly mounted on the said sprocket; a. each of the said first and second brush arm assemblies comprising a first movable bracket and second bracket, b. the said first movable bracket having support means for at least one cleaning brush suitable for removing rust and scale from pipe surfaces, 1. the said first bracket having a first and a second bolt extending through the face surfaces of the said first movable bracket to furnish support means for a first and a second movable web member, 2. the said first and second bolts being positioned at each of two corners of the said first movable bracket, 3. the said first bracket having an extension attached thereto with fastening means for securing one end of a curved surfaced spring in an extended position from the said first brush arm assembly to the said second brush arm assembly, the said spring furnishing constant pressure on the said cleaning brush, c. the said second bracket being attached to the said sprocket by means of a circular rod, 1. the said second bracket having two face plates spaced apart from each other and held in spaced relationship by the said circular rod, a first bolt and a second bolt, 2. the said circular rod, the first and second bolts being positioned at each of the corners of the said face plates, 3. the said first bolt providing support means for a rotatable spring spool positioned between the said two face plates, the said spring spool having the said curved surfaced spring spirally wound on the said spring spool, the said curved surfaced spring extending to the said fastening means in the said first bracket, 4. the said first and second bolts in the said second bracket each supporting the said first and second movable web member respectively, the said web members extending to the said first bracket and providing connection means between the said second bracket and the said first bracket in each of the said brush arm assemblies.