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SELF-RETAINING ASSEMBLY PIN

IP.com Disclosure Number: IPCOM000005709D
Original Publication Date: 1988-Oct-01
Included in the Prior Art Database: 2001-Oct-30
Document File: 1 page(s) / 51K

Publishing Venue

Motorola

Related People

Michael P. Goldenberg: AUTHOR [+2]

Abstract

Most pivoting belt-clip systems incorporate a metal pin which serves as a rotation bearing surface and fastening device. The majority of these pins require a snap ring or washer to retain them in the assembly. This additional piece-part adds to the product cost and manufacturing complexity. There are pivot pins on the market which are self-retaining, however they require a frictional force from the bearing surface for retention. This weakens plastic bosses commonly used in radio products. Some designs rely on a compression fit which results in stress relaxation, others require a spline force fit which create stress concentrations in the boss. Both of these designs sacrifice the structural integrity of the assembly.

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MOTOROLA Technical Developments Volume 8 October 1988

SELF-RETAINING ASSEMBLY PIN

by Michael f? Goldenberg and Gustav0 G. Suarez

   Most pivoting belt-clip systems incorporate a metal pin which serves as a rotation bearing surface and fastening device. The majority of these pins require a snap ring or washer to retain them in the assembly. This additional piece-part adds to the product cost and manufacturing complexity. There are pivot pins on the market which are self-retaining, however they require a frictional force from the bearing surface for retention. This weakens plastic bosses commonly used in radio products. Some designs rely on a compression fit which results in stress relaxation, others require a spline force fit which create stress concentrations in the boss. Both of these designs sacrifice the structural integrity of the assembly.

   These short-comings can be eliminated by using the sides of the bosses (1) as opposed to the interior bearing surface (2) for retention purposes. The self-retaining assembly pin achieves this by incorporating a barb- like feature (3) which engages the boss side-wall after full insertion. The outer boss (4) limits the amount of insertion travel on assembly. Should a pin with a head be desired, this feature could become the travel-limiting feature. The design shown is made from a half-round wire bent back on itself into the form shown. This device can also be formed from a flat material and rolled or coined to achieve the s...