Threaded – headed fastener – or washer making: process and apparat – Process – Making externally threaded fastener – e.g. – screw or bolt
Reexamination Certificate
2007-09-11
2007-09-11
Tolan, Ed (Department: 3725)
Threaded, headed fastener, or washer making: process and apparat
Process
Making externally threaded fastener, e.g., screw or bolt
C470S010000, C470S018000, C470S066000
Reexamination Certificate
active
11156947
ABSTRACT:
A method for making a ball-nut includes cutting a 360-degree closed-loop surface groove in the inner-circumferential wall portion of a ball-nut body using a whirling-type internal-diameter cutting machine. The closed-loop surface groove surrounds the longitudinal axis of the wall portion, is adapted for receiving a plurality of ball bearings, includes a helical-grooved portion substantially coaxially aligned with the longitudinal axis, and includes a crossover-grooved portion. A method for making a ball-screw includes cutting at least one 360-degree closed-loop surface groove in the outer-circumferential wall portion of a ball-screw body using a whirling-type external-diameter cutting machine. The closed-loop surface groove surrounds the longitudinal axis of the wall portion, is adapted for receiving a plurality of ball bearings, includes a helical-grooved portion substantially coaxially aligned with the longitudinal axis, and includes a cross-under-grooved portion.
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PCT Written Opinion dated Dec. 19, 2005.
International Search Report dated Dec. 19, 2005.
Jaffe, George & Beck, Alexander, “Precise Moves Depend on Ball-Screw Threads”, pp. 1-4, http://www.machinedesign.com/asp/articleLoader.asp?catId=2&path=D%3A%5Cinetpub%.
“The Cutting Process and Chip Formation” from Leistritz Corporation, Machine Tool Division, 165 Chestnut St., Allendale, NJ 07401.
Wehmann, Ralph, “The Whirling Process for Improved Worm Gears” from Leistritz Corporation (as seen in GEARSolutions magazine, pp. 1-8.
Bucholz Thomas J.
Drennen David B.
Mescher Patrick A.
Murphy Kathleen
Siler Ernest R.
McBain Scott A.
Tolan Ed
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