Machine element or mechanism – Gearing – Directly cooperating gears
Reexamination Certificate
2008-04-29
2008-04-29
Fenstermacher, David M. (Department: 3682)
Machine element or mechanism
Gearing
Directly cooperating gears
C074S424870, C074S424820
Reexamination Certificate
active
07363835
ABSTRACT:
A ball screw apparatus includes: a screw shaft having a screw groove, a nut having a screw groove and holes, a number of balls rollably provided between the screw grooves, and a ball circulating member having an end portion to be fitted to the holes. The ball circulating member includes aside cap having leg portions to be fitted into the holes. Each of the leg portions contains a scooping up path or a returning path. The scooping up path and the retuning path are inclined with respect to outer peripheral faces of the leg portions. The holes include a slot substantially in parallel with directions of the screw grooves. The scooping up path and the returning path are directed substantially in a tangential direction of the screw shaft and inclined substantially toward a lead angle direction of the screw grooves.
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Hayashi Eiji
Ohkubo Tsutomu
Fenstermacher David M.
NSK Ltd.
Sughrue & Mion, PLLC
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