Descaling Tool

Author:  Joseph F. Niedzwiecki
Source:  US Patent 3,349,461
Doc ID:  1966029
Year of Publication:  1966
Abstract:  
A needle-type descaling tool which includes a fluid motor casing and a tubular sleeve removably attached to the casing. A needle holder is mounted in the forward end of the tubular sleeve. There is an axially reciprocal anvil having a cup shaped end which is arranged so that it slides over one end of the needle holder. The bottom of the cup strikes the needles to deliver an impact.