Machine element or mechanism – Gearing – Directly cooperating gears
Reexamination Certificate
2008-04-01
2008-04-01
Joyce, William C. (Department: 3682)
Machine element or mechanism
Gearing
Directly cooperating gears
C074S424820
Reexamination Certificate
active
10485881
ABSTRACT:
The invention relates to a ball screw device in which a screw shaft and a nut member are threadedly engaged with each other through a number of balls. In such a ball screw device, an inner surface of a cover plate contacting an end surface of a nut main body is provided with a projecting return piece adapted to be fit-engaged with a recess cut in an inner peripheral surface of the nut main body, the return piece being provided with a scoop portion for dislodging the balls from the ball rolling groove of the screw shaft and a direction switching passage for guiding the dislodged balls to the entrance of a ball return hole. The projecting return piece is divided into a first piece formed integral with the cover plate and a second piece fixed to the first piece by a curved plane including the center line of the direction switching passage.
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International Search Report for PCT/JP02/08917 mailed on Dec. 10, 2002.
Nishimura Kentarou
Niwa Hiroshi
Yoshida Akimasa
Joyce William C.
Rader & Fishman & Grauer, PLLC
THK Co. Ltd.
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