| 摘要 |
A fastening pin for use in connecting printed circuit boards or the like constructed of concentrically arranged split tubes or layers of material having different thermal properties. One tube is made from a heat recoverable metal alloy, that is, a metal alloy that can be caused to exhibit a decided reduction in strength and be deformed when it passes through a transition point in a first direction and a reverse change in dimension and increase in strength when it passes through the transition point in the opposite direction. The other tube is resilient and has spring like characteristics so that it has sufficient strength to move the first tube of material when the latter is in its low strength condition, and sufficient flexibility to be moved by the first tube of material when it changes dimension. The pins are formed by taking split cylinders of each material and force fitting the tube of heat recoverable metal inside the tube of spring metal. Also disclosed is a similar pin wherein two layers of heat recoverable metal are used to sandwich a layer of spring like material, and a sectionalized pin which permits substantially independent motion by different segments thereof. |
