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Clutched Lift Mechanism

IP.com Disclosure Number: IPCOM000081987D
Original Publication Date: 1974-Sep-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Mott, WE: AUTHOR

Abstract

A clutched lift mechanism is employed to position a member at a selected one of two vertically oriented positions. The clutching arrangement prevents the weight of the member from overdriving the lifting mechanism.

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Clutched Lift Mechanism

A clutched lift mechanism is employed to position a member at a selected one of two vertically oriented positions. The clutching arrangement prevents the weight of the member from overdriving the lifting mechanism.

To lower the member, not shown, solenoid 21 is energized causing latch 22 to rotate in a clockwise direction. The movement of the latch energizes spring clutch 24, which supplies drive power from the constantly rotating arbor 25 to shaft 27. Gear 29 on shaft 27 drives gear 31, effecting rotation of cam 33 in a clockwise direction toward the low point of the cam. Cam follower assembly 35 is connected to lift rod 37 which is connected to the end of the member being lowered.

As cam 33 is rotated toward its low point, the weight of the member tends to overdrive the system. A second spring clutch 39 is employed to control this motion and is driven in its winding direction as an overdrive occurs, thereby preventing gear 29 from rotating faster than shaft 27. When cam 33 reaches its low point, spring loaded detent 41 prevents further movement of the member.

The de-energization of solenoid 21 causes restore spring 43 to lift latch 22 away, allowing spring clutch 24 to drive the system again. Through the aforedescribed gear arrangement, cam 33 is rotated to lift the member to its upper position.

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