| 摘要 |
A circuit board fastener includes a tubular shank and a slideable expander pin which is pressed into a bore in the shank. A flange at the top seats the fastener against the member to be joined to the circuit board. The pin has an interference fit and remains within the bore, which is convergent at the bottom end of the fastener. When the expander pin is driven into the convergent bottom end of the bore, it expands that end of the shank to grip the inner wall of the circuit board aperture. The pin is moved by a simple pressing force into the bore, which is applied by a tool from above to install the fastener to the circuit board, or from below to disengage the fastener from the circuit board. The two-part fastener may be constructed from a unitary part which may be conveniently broken into the two mating components and assembled in one motion. In this latter case, a frangible collar between the expander pin and the top of the flange is broken by a compressive force which separates the parts and drives the pin into the bore.
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