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Browse Prior Art Database

Self-Centering, Anti-Backlash Leadscrew Unit

IP.com Disclosure Number: IPCOM000046942D
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Holland, EC: AUTHOR [+2]

Abstract

A cylindrical leadscrew nut 1, preferably made from plastic material, is provided on its inside with elongated flexible arms 2, 3 emanating from the center part 4 of nut 1, extending towards its ends 5, 6 and being slightly inclined in the direction to the axis 7 of nut 1. The arms 2, 3 extend in alternate fashion to the nut ends 5, 6 - arms 2 toward end 5, arms 3 toward end 6 - and carry tabs 8 on their outer extremities. They are threaded to cooperate and be driven by a leadscrew (not shown). Fig. 1 depicts in an end view nut 1 with four arms 2 pointing into the drawing plane and also four arms 3 pointing out of the drawing plane toward nut end 6. The alternating arms are provided at equal circumferential positions on the inside of nut 1. Fig. 2 depicts a sectional view along line II-II of Fig.

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Self-Centering, Anti-Backlash Leadscrew Unit

A cylindrical leadscrew nut 1, preferably made from plastic material, is provided on its inside with elongated flexible arms 2, 3 emanating from the center part 4 of nut 1, extending towards its ends 5, 6 and being slightly inclined in the direction to the axis 7 of nut 1. The arms 2, 3 extend in alternate fashion to the nut ends 5, 6 - arms 2 toward end 5, arms 3 toward end 6 - and carry tabs 8 on their outer extremities. They are threaded to cooperate and be driven by a leadscrew (not shown). Fig. 1 depicts in an end view nut 1 with four arms 2 pointing into the drawing plane and also four arms 3 pointing out of the drawing plane toward nut end 6. The alternating arms are provided at equal circumferential positions on the inside of nut 1. Fig. 2 depicts a sectional view along line II-II of Fig. 1, the nut 1 with its alternating flexible arms 2 and 3 inclined toward axis 7. The distance between thread form tabs 8 of arms 2 and thread form tabs 8 of arms 3 conforms axially with the helix of the leadscrew. Thrust in both axial directions will be absorbed without backlash through the beam effect of the opposing arms 2, 3 carrying the tabs 8, and controlled, equally distributed, contact pressure against the leadscrew is assured. As the arms 2, 3 join the body of the nut 1 in its center part 4, a self-centering and self-adjusting ability exists.

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