Bimal K Chaterjee

US Patent:

7047848, May 23, 2006

Filed:

Feb 11, 2003

Appl. No.:

10/361609

Inventors:

Bimal Kumar Chaterjee - Jackson TN, US
Alan Phillips - Jackson TN, US
John Robert Kriaski - Jackson TN, US
Daniel Paxton Wall - Humboldt TN, US

Assignee:

Portar-Cable/Delta - Jackson TN

International Classification:

B25B 23/157
B23P 11/00

US Classification:

81475, 2952511

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.

US Patent:

20060185813, Aug 24, 2006

Filed:

Apr 17, 2006

Appl. No.:

11/404877

Inventors:

Bimal Chaterjee - Jackson TN, US
Alan Phillips - Jackson TN, US
John Kriaski - Jackson TN, US
Daniel Wall - Humboldt TN, US

International Classification:

A01H 5/02
F16D 23/00
C22C 38/08

US Classification:

164047000, 420112000, 192054100

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.

US Patent:

20090145568, Jun 11, 2009

Filed:

Feb 9, 2009

Appl. No.:

12/368095

Inventors:

Bimal Kumar Chaterjee - Jackson TN, US
Alan Phillips - Jackson TN, US
John Robert Kriaski - Jackson TN, US
Daniel Paxton wall - Humboldt TN, US

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

B22D 27/00

US Classification:

164 571

Abstract:

A method of making a wear and fatigue resistant component of a power tool (e.g., a clutch) includes providing a quantity of base steel and a quantity of alloying elements to be added to the base steel to form a desired alloyed grade of steel. The base steel and alloying elements are combined and melted to produce a molten alloyed steel (e.g., SAE 9310 or AISI M2). The molten alloyed steel is cast using a near-net-shape investment casting process to form a component of a power tool. An edge of the component is pre-radiused. and the component is case hardened after the edge of the component has been pre-radiused. In one implementation, the component is a clutch that has a lifespan of at least twice a lifespan of a second clutch that has not been pre-radiused prior to case hardening.

US Patent:

57074607, Jan 13, 1998

Filed:

Jul 11, 1995

Appl. No.:

8/500533

Inventors:

Bimal K. Chaterjee - Jackson TN

Assignee:

Porter-Cable Corporation - Jackson TN

International Classification:

C23C 832
C23C 856
C23C 876

US Classification:

148218

Abstract:

Improved corrosion, wear and fatigue resistance is provided for pieces formed of medium alloy, low carbon steel by subjecting the piece to a treatment process which includes a step of carburizing, followed by nitriding. The process is especially useful for producing durable and low-cost steel parts, for example for certain automotive and marine applications, pumps (especially positive displacement pumps), chemical or food processing equipment, power tools, and the like. The blade-carrying reciprocating shaft for a reciprocating power saw is a specific example.