easily met in those embodiments not illustrated in which either the fuse or the spring are provided with sufficiently small diameters as to slide within a hollow cylindrical interior of the plunger according to the embodiment of the invention illustrated in fig4 let us assume that the cigarette lighter adapter assembly is accidentally dropped as often happens with such assemblies and a significant force inadvertently applied to plunger 66 e g plunger contact end 68 hits the floor or pavement in the event of such an accident plunger 66 retracts towards and into contact with force preventing means 80 and the inadvertently applied force is absorbed thereby thus protecting the relatively fragile retaining bead 72 from being broken by the sizeable force which would otherwise impact upon it the adapter of the present invention can be manufactured using techniques well known in the art thus the main body and cap of the adapter housing can be made of diverse known thermoplastics using conventional thermoplastic molding techniques such as injection molding the plunger retention means exemplified in the preferred embodiments as a retaining bead can be formed integrally with the housing using well known force pressing sonic welding or heat fixture processes in this regard for example the retaining bead can be formed on the cap means of the same thermoplastic material as the housing by reflowing plastic using sonic welding employing ultrasonic vibration at 20 khz up to greater than 40 khz with 40 khz representing a particularly useful operating point the force absorbing means exemplified in the preferred embodiments as a backing tube or.