Tools – Wrench – screwdriver – or driver therefor – Responsive to torque on work
Reexamination Certificate
2006-05-23
2006-05-23
Hong, John C. (Department: 3726)
Tools
Wrench, screwdriver, or driver therefor
Responsive to torque on work
C029S525110
Reexamination Certificate
active
07047848
ABSTRACT:
A process for manufacturing highly wear and fatigue resistant steel components for power tools includes melting and mixing together a readily available base steel and alloying elements. The molten steel is cast into near-net-shape in an investment casting process. This method is cost competitive with forming the same component from steel with fewer alloying elements. In particular, clutch plates for a drill/driver or screw gun can be formed in this manner from a steel containing relatively large amounts of nickel and chromium, such as SAE 9310 steel, or from a steel containing a relatively large total amount of molybdenum and tungsten, such as AISI M2 steel.
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Chaterjee Bimal Kumar
Kriaski John Robert
Phillips Alan
Wall Daniel Paxton
Hong John C.
Hunton & Williams
Portar-Cable/Delta
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