Patent ID: 11885188
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 9:
10. A section mill comprising:
(a) a longitudinally extending tubular mill body having an upper end, a lower end, a mill body central fluid bore, and a mill window;
(b) a mill carrier positioned within said longitudinally extending tubular mill body, said mill carrier having an exterior surface and an interior surface, said interior surface of said mill carrier having a beveled ramp profile;
(c) a cutter blade on said exterior surface of said mill carrier, said cutter blade having a cutter surface;
(d) a hinge pin transversely mounted to said longitudinally extending tubular mill body, said hinge pin pivotally mounting said mill carrier to said longitudinally extending tubular mill body within said central bore of said longitudinally extending tubular mill body whereby said mill carrier is configured to pivot longitudinally radially outward and inward with respect to said longitudinally extending tubular mill body;
(e) a translatable piston having an elongated driveshaft, said elongated driveshaft having an upper portion and a lower portion, said lower portion of said elongated driveshaft having a radially extending cylindrical nose cone, whereby said cylindrical nose cone is engageable with said beveled ramp profile of said interior surface of said mill carrier by downward translation of said translatable piston and disengageable from said beveled ramp profile of said interior surface of said mill carrier by upward translation of said translatable piston; and
(f) wherein said translatable piston is biased in an upward position by a compression spring.