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Browse Prior Art Database

Direction-Actuated Gearface Backcheck

IP.com Disclosure Number: IPCOM000040696D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Horrall, PD: AUTHOR [+2]

Abstract

A backcheck has a flexible actuation arm requiring a very small amount of torque when a gear rotates in a desired direction. The backcheck has a backcheck arm, which is relatively rigid, to engage a tooth of the gear to prevent rotation in the undesired direction. Because the backcheck is formed of a very soft polyurethane, it is extremely quiet. A backcheck 1, which is formed of a very soft polyurethane, rotates counterclockwise about a post 2 as a gear 3 rotates clockwise. Counterclockwise rotation of the backcheck 1 about the post 2 by the gear 3 is produced by one of teeth 4 of the gear 3 engaging an actuation arm 5 of the backcheck 1.

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Direction-Actuated Gearface Backcheck

A backcheck has a flexible actuation arm requiring a very small amount of torque when a gear rotates in a desired direction. The backcheck has a backcheck arm, which is relatively rigid, to engage a tooth of the gear to prevent rotation in the undesired direction. Because the backcheck is formed of a very soft polyurethane, it is extremely quiet. A backcheck 1, which is formed of a very soft polyurethane, rotates counterclockwise about a post 2 as a gear 3 rotates clockwise. Counterclockwise rotation of the backcheck 1 about the post 2 by the gear 3 is produced by one of teeth 4 of the gear 3 engaging an actuation arm 5 of the backcheck 1. The post 2 has an extension 6 disposed in a slot 7 in the backcheck 1 and engaging an edge 8 of the backcheck 1 when the backcheck 1 is rotated counterclockwise about the post 2 by one of the teeth 4 of the gear 3 engaging the actuation arm 5. As the gear 3 rotates clockwise, the actuation arm 5 is not pushed completely out of engagement with one of the teeth 4 of the gear 3 because engagement of the edge 8 of the backcheck 1 with the extension 6 of the post 2 limits counterclockwise rotation of the backcheck 1. However, when the edge 8 of the backcheck 1 is engaging the extension 6 of the post 2, a backcheck arm 9, which is much thicker than the actuation arm 5 and relatively rigid, is completely disengaged from the gear teeth 4. Because of the actuation arm 5 being relatively thin so as t...