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Ball Nut Backlash Eliminator

IP.com Disclosure Number: IPCOM000047334D
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Bevil, JM: AUTHOR [+2]

Abstract

Backlash between lead screw 10 and precision ball nut follower 11, which drives a reciprocating output device 12, is removed by spring-biased lead-screw follower 13. Follower 13 freely pivots in retainer block 14 which is slidably carried by a pin 15 connected to device 12. Mounting bracket 16 includes a slot 17 which permits limited motion of retainer 14 along slide pin 15. Spring 18 forces retainer block 14 rightwardly to take up any play that might exist in the ball follower 11, thereby eliminating backlash. Shoe 13 preferably has a radius of curvature R slightly greater than that of the lead-screw grooves so as to avoid scrubbing removal of lubricant from the groove.

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Ball Nut Backlash Eliminator

Backlash between lead screw 10 and precision ball nut follower 11, which drives a reciprocating output device 12, is removed by spring-biased lead-screw follower 13. Follower 13 freely pivots in retainer block 14 which is slidably carried by a pin 15 connected to device 12. Mounting bracket 16 includes a slot 17 which permits limited motion of retainer 14 along slide pin 15. Spring 18 forces retainer block 14 rightwardly to take up any play that might exist in the ball follower 11, thereby eliminating backlash. Shoe 13 preferably has a radius of curvature R slightly greater than that of the lead-screw grooves so as to avoid scrubbing removal of lubricant from the groove.

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