Turning – Lathe
Reexamination Certificate
1999-11-16
2001-08-14
Tsai, Henry (Department: 3722)
Turning
Lathe
C082S152000, C082S162000, C082S173000
Reexamination Certificate
active
06272954
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to the machining of explosive materials.
In a number of industrial and scientific fields, it is necessary to machine explosive materials, such as those employed for weapon warheads and rocket propellants. In the course of development of a new explosive material, it is necessary to machine the material in a laboratory setting in order to determine whether the material can be safely machined in an industrial manufacturing facility. In accordance with standard safety practices, such experimental machining is carried out under automated or remote control in an enclosure from which personnel are evacuated prior to a machining operation so that there will be no danger of injury or fatalities.
However, the experimental machining apparatus itself is of necessity in proximity to the material being machined and will be subject to destruction, or at least costly damage, in the event of an explosion.
BRIEF SUMMARY OF THE INVENTION
It is an object of the present invention to prevent or minimize damage to machining apparatus in the event of explosion of material being machined.
A more specific object of the invention is to prevent physical damage to the machining equipment due to explosion shock waves.
Another specific object of the invention is to prevent the machining apparatus from experiencing damage caused by dust resulting from an explosion of material being worked on.
The above and other objects are achieved, according to the present invention, by an apparatus for machining workpiece made of an explosive material, the apparatus comprising: a drive system and a cutting tool assembly for cutting a workpiece made of an explosive material; an elongate member carried by, and projecting along an axis from, the drive system for holding the workpiece at a machining location while being rotated about the axis by said drive system; and a first shield element interposed between the machining location and the drive system for protecting the drive system against damage in the event of explosion of the workpiece.
REFERENCES:
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patent: 2748578 (1956-06-01), Potts
patent: 3404557 (1968-10-01), Hecht et al.
patent: 3858987 (1975-01-01), Kleinhans et al.
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patent: 4514936 (1985-05-01), Hurtado
patent: 5131941 (1992-07-01), Lemelson
patent: 5613453 (1997-03-01), Donovan
patent: 5728967 (1998-03-01), Parkes
patent: 5992276 (1999-11-01), Sullivan
Beus Ray
Geiss, Jr. Donald
Hatch Robert
Nicolich Steven
Cordant Technologies Inc.
Sullivan Law Group
Tsai Henry
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