US Patent 10112516 Dual function stowable armrest

An armrest assembly for a vehicle includes a displaceable armrest element and a linkage assembly. The linkage assembly is configured for translating the displaceable armrest element between a deployed configuration and a folded configuration. The linkage assembly includes a spring-actuated pivoting over-center link configured to disengage the linkage assembly to allow the displaceable armrest element to rotate. An actuator is provided which on sensing an impact ruptures a frangible fastener holding the over-center link in a substantially parallel orientation to at least one drive link, thereby allowing the spring-actuated over-center linkage to pivot relative to the at least one drive link.