Water powered impulsive unit

Details Water powered impulsive unit Water powered impulsive unit

2006-09-07

2011-10-11

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Work cleansing

Cleansing fluid passage through hammer head

C173S080000, C173S135000, C173S206000

Reexamination Certificate

active

08033343

ABSTRACT:
An impulsive unit for a jack hammer or rock drill is adapted to be powered by water, and comprises a piston slidable within a cylinder, and carrying a striker portion thereon. At least a portion of the piston and/or cylinder is coated with ceramic. The ceramic is most suitably an aluminum oxide-titanium dioxide composite, which enables the clearance between the internal diameter of the cylinder and the external diameter of the piston to be reduced to between 8 and 10 micro-meters.

REFERENCES:
patent: 1663403 (1928-03-01), Gilman
patent: 1740687 (1929-12-01), Gartin
patent: 1918787 (1933-07-01), Smith, Sr.
patent: 3057417 (1962-10-01), Sandvig
patent: 5236787 (1993-08-01), Grassi
patent: 5402854 (1995-04-01), Kimberlin et al.
patent: 5773078 (1998-06-01), Skelly
patent: 6817840 (2004-11-01), Schwarzkopf
patent: 6952009 (2005-10-01), Engstrand
patent: 3342879 (1985-06-01), None
patent: O171374 (1986-02-01), None

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