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Stress Diffusing Base for Connector Pins

IP.com Disclosure Number: IPCOM000050563D
Original Publication Date: 1982-Nov-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Van Vechten, JA: AUTHOR [+2]

Abstract

Connectors usually have pins which abruptly emerge from base material so as to form a well-defined angle, usually 90 degrees. During insertion into female connectors, and in use, lateral stresses are imparted to the pins which are concentrated at the corners between the pins and the base. These stresses may cause pin fracture. In order to minimize the possibility of fracture, the stiffness of the base material about the connector pin is graded in order to prevent abrupt changes in restraining forces imparted to the pin by the base. The stiffness of the base material varies spatially so that the base is least stiff where the pin emerges, and becomes stiffer along the pin as the depth into the base increases'

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Stress Diffusing Base for Connector Pins

Connectors usually have pins which abruptly emerge from base material so as to form a well-defined angle, usually 90 degrees.

During insertion into female connectors, and in use, lateral stresses are imparted to the pins which are concentrated at the corners between the pins and the base. These stresses may cause pin fracture. In order to minimize the possibility of fracture, the stiffness of the base material about the connector pin is graded in order to prevent abrupt changes in restraining forces imparted to the pin by the base. The stiffness of the base material varies spatially so that the base is least stiff where the pin emerges, and becomes stiffer along the pin as the depth into the base increases'

In Fig. 1, the graded stiffness is achieved by forming a collar 10 for the pin by laminating a number of sheets of compatible materials of varying stiffness. The least stiff layer 12 of the collar is located close to where the pin 14 emerges from the base material 16. The stiffest layer 18 of the collar is located at the bottom of the collar, while the intermediate layers have progressively larger stiffness in a direction from layer 12 to layer 18. The remainder 20 of the base material is located around the collar 10, and is comprised of the usual base material. For example, pin 14 can be comprised of a metal, and the base material can be, for example, plastic. Suitable materials for the collar layers include different stiffness rubber, plastics, ceramics, wood, metals, glass, or fiber glass. Add...