Metal working – Means to assemble or disassemble – Heat exchanger
Reexamination Certificate
1999-10-12
2001-02-06
Cuda Rosenban, I (Department: 3726)
Metal working
Means to assemble or disassemble
Heat exchanger
C029S03300H, C029S726000, C029S890031
Reexamination Certificate
active
06182354
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 installed boiler tubes for subsequent replacement
BACKGROUND OF THE INVENTION
Experience in connection with the removal of water-tubes and fire-tubes from within power boilers for 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. has shown that because of depth-of-cut procedural limitations that may be in effect to avoid possible drum wall damage, or sometimes because of gap-cutting tool construction characteristics, sufficient gap metal in a remaining boiler tube end segment is not removed in the initial longitudinal gap cutting operation and particularly at the tube segment flared end. In some instances little or not flared-end metal at the gap location is initially removed using the known gap-cutting tool.
In order to properly accomplish preparation of a retained boiler tube flared-end segment for subsequent final gap metal removal steps of “peeling” and “crushing”, I have devised a novel tool, sometimes called a “nipper” tool, that properly shears and bends to-be-removed gap metal in the boiler tube flared end to thereby complete the preliminary formation of the tube gap without damaging or removing metal from the co-operating boiler tube drum wall.
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 comprised of a tool head subassembly provided with a rigid frame, an anvil and co-operating shear blade that is pivotally carried by the frame and engaged with a boiler tube flared end, a reciprocating cam that causes pivoting of the tool assembly shear blade element, and with a reversible, pressurized fluid actuator subassembly that is supported by the tool head frame and that causes reciprocating movement of the tool head cam element. Operation of the actuator subassembly in a positive direction, following insertion of the tool head anvil in a cut boiler tube flared-end and engagement of the tool shear blade with the boiler tube end segment flare, causes the shear blade to be rotated to double shear and downwardly bend a portion of the lip of the tube flare that ultimately comprises an extension of the desired tube end segment longitudinal gap. The tool may then be conveniently removed from engagement with the boiler tube end segment by simple longitudinal rotation, and the reciprocating cam retracted in preparation for next use of the tool.
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.
Cuda Rosenban I
Nguyen Trinh
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