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Browse Prior Art Database

Device for Preventing Removal of a Pivotal Element From Its Support

IP.com Disclosure Number: IPCOM000059878D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Jennings, JH: AUTHOR

Abstract

Removal of a pivotal element from its support is prevented when the pivotal element is subjected to a force in the direction of the pivot axis. A paper table 1 of a typewriter has a page end indicator 2 pivotally connected thereto through a mushroom 3, which comprises four separate portions, on the paper table 1 extending through an opening 4 in the page end indicator 2. This enables the page end indicator 2 to pivot about the center of the opening 4. When assembling the page end indicator 2 and the paper table 1, the mushroom 3 passes through the opening 4 in the page end indicator 2. A pin 5, which is supported on a bridge 6 mounted on the page end indicator 2, extends into the opening 4.

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Device for Preventing Removal of a Pivotal Element From Its Support

Removal of a pivotal element from its support is prevented when the pivotal element is subjected to a force in the direction of the pivot axis. A paper table 1 of a typewriter has a page end indicator 2 pivotally connected thereto through a mushroom 3, which comprises four separate portions, on the paper table 1 extending through an opening 4 in the page end indicator 2. This enables the page end indicator 2 to pivot about the center of the opening 4. When assembling the page end indicator 2 and the paper table 1, the mushroom 3 passes through the opening 4 in the page end indicator 2. A pin 5, which is supported on a bridge 6 mounted on the page end indicator 2, extends into the opening 4. However, as the mushroom 3 moves through the opening 4 during assembly, the bridge 6 flexes sufficiently to allow the pin 5 to move slightly away from the position shown in the drawing. As soon as the widest area of the mushroom 3 exits from the opening 4, the pin 5 enters between the four portions of the mushroom 3 to lock the mushroom 3 to the page end indicator 2 with the mushroom 3 having its head abutting the surface of the page end indicator 2. Therefore, if a force is exerted on the page end indicator 2 in a direction along the axis of the pin 5, the page end indicator 2 cannot be dislodged from the mushroom 3 since the pin 5 is disposed within the mushroom 3 and prevents the mushroom 3 from collapsing...