Solderless Spring/Pin Connection
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-31
Spring pins are commonly used in multi-layered printed circuit boards (PCBs) to establish electrical connection between a plated through hole (PTH) and the pin. The pin has a shoulder which acts as a spring to form a gas-tight joint between the PTH wall and the pin. A layer of tin lead in the PTH, pin, or both, is used as a lubricant because insertion forces and friction are high (upward of 30 lbs.). Nitinol (NiTi Naval Ordnance Laboratory), because of its "remembering" property, accomplishes the same task but eliminates the high insertion force in the manner described in the following.