Browse Prior Art Database

Two Speed Drive Link

IP.com Disclosure Number: IPCOM000081527D
Original Publication Date: 1974-Jun-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

McEfee, DR: AUTHOR

Abstract

Fig. 1 shows the normal arrangement for a lead screw and nut. In this configuration, the moving member 10 moves at a one-to-one ratio with the follower nut 11. The follower nut 11 is connected directly to the moving member 10 and travels along lead screw 12.

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Two Speed Drive Link

Fig. 1 shows the normal arrangement for a lead screw and nut. In this configuration, the moving member 10 moves at a one-to-one ratio with the follower nut 11. The follower nut 11 is connected directly to the moving member 10 and travels along lead screw 12.

With reference to Fig. 2, the follower nut 4 is disconnected from the moving member 2. An additional shaft 6 is added that includes pivot point A. Pivot point A is attached to a sliding member 1 that has a constant coulomb friction force. Link 3 is connected to pivot points A, B and C and may be expandable in return. As the lead screw 7 is rotated and point C moves between the limit stops 5 and 8, the link 3 rotates around point A. Point B and the moving member 2 travel at a rate which is less than the follower nut 4 by the amount:
VB = AB over AC VC. When the follower nut 4 contacts the limit stop 5 or 8 the entire assembly automatically goes into a drag mode and point A slides along shaft 6 until a new position is reached. During this portion of travel, the moving member 2 moves at a one-to-one ratio with the follower nut 4.

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