Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Reexamination Certificate
2006-06-16
2011-11-08
Hannon, Thomas R (Department: 3656)
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
C074S424810
Reexamination Certificate
active
08051729
ABSTRACT:
The present invention provides a screw device which takes a heavy load in one direction along the axis of the screw shaft and only a light load in the opposite direction, the screw device capable of providing ease of control of preloading.The screw device of the present invention has a screw shaft1with an outer surface having a ball rolling groove1afor rolling balls7and a roller rolling groove1bfor rolling rollers6both spirally formed thereon; a ball nut4with an inner surface having a ball rolling groove4aspirally formed thereon facing the ball rolling groove1aof the screw shaft1; a roller nut5with an inner surface having a roller rolling groove5aspirally formed thereon facing the roller rolling groove1bof the screw shaft1; a plurality of balls7arranged between the screw shaft1and the ball nut4; and a plurality of rollers6arranged between the screw shaft1and the roller nut5. The ball nut4and the roller nut5are connected along an axis of the screw shaft1.
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Arai Hiroyuki
Fujita Satoshi
Nagai Satoru
Nishimura Kentaro
Uesugi Masakazu
Hannon Thomas R
Johnson Phillip A
THK Co. Ltd.
Westerman Hattori Daniels & Adrian LLP
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