Metal working – Plural diverse manufacturing apparatus including means for... – Binding or covering and cutting
Reexamination Certificate
1999-10-12
2001-04-03
Cudy, I (Department: 3726)
Metal working
Plural diverse manufacturing apparatus including means for...
Binding or covering and cutting
C029S727000, C029S726000, C029S890031
Reexamination Certificate
active
06209181
ABSTRACT:
CROSS-REFERENCES
None.
FIELD OF THE INVENTION
This invention pertains generally to power boilers, and specifically concerns apparatus that is particularly useful in connection with the maintenance removal of selected boiler tubes from being installed in a boiler drum wall as for subsequent replacement.
BACKGROUND OF THE INVENTION
The removal of water-tubes and fire-tubes from within power boilers for subsequent replacement using a tube-end gap-cutting tool of the type disclosed and claimed in U.S. Pat. No. 5,893,209 granted to Weeks et al. results in an intermediate-stage boiler tube flared-end segment that although having a pair of longitudinal gaps such gaps do not extend completely through the tube end wall material and the longitudinally-machined tube segment remains retained in the co-operating boiler drum wall. Such occurs because of a requirement to not cut into or otherwise damage drum wall metal. I have discovered that removal of the retained and gapped boiler tube flared-end segment is facilitated by use of a novel tool assembly that functions, by a shearing and bending action, to “peel” tube-end wall metal positioned between the spaced-apart machined longitudinal gaps in the tube end segment completely away from the boiler drum wall and without possibility of wall damage.
Other objects and advantages of the present invention will become apparent from a consideration of the descriptions, drawings, and claims which follow.
SUMMARY OF THE INVENTION
The present invention is basically an assembly comprised of: a threaded body subassembly; a clamp subassembly carried by the threaded body subassembly and adapted, when actuated, to clamp the tool assembly to the interior wall of the partially-gapped boiler tube-end that is to have its remaining gap metal removed by a “peeling” operation; a conventional pressurized-fluid actuator subassembly also carried by the tool threaded body subassembly and having an actuator cylinder and co-operating actuator piston rod; and a tool peeler blade subassembly connected to and reciprocated by the actuator subassembly piston rod.
The invention tool assembly is operated to sequentially clamp the assembly to the interior wall surface of the co-operating boiler tube end segment, engage and continuously bend and shear the between-gaps metal in the wall-retained boiler tube end-segment throughout the end-segment length during a tool assembly power stroke, retract the assembly peeler blade element, and release the tool assembly from clamped engagement with the boiler tube end-segment wall surface. The tube retained end-segment is then in a condition readied for subsequent tube diametric compression and withdrawal.
REFERENCES:
patent: 3835520 (1974-09-01), Sismore
patent: 3857158 (1974-12-01), Costello
patent: 4967468 (1990-11-01), Vossbrinck et al.
patent: 5205038 (1993-04-01), Archer et al.
patent: 5826334 (1998-10-01), Weeks et al.
patent: 5826335 (1998-10-01), Tegethoff et al.
patent: 5974642 (1999-11-01), Weeks et al.
Advanced Cutting Technologies, Ltd.
Baker, Jr. Thomas S.
Cudy I
Nguyen Trinh
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