Abstract: A lamp assembly for an examination light has a housing and reflector with a cover that assembles into the housing. The cover has four groups of three lugs each which upon rotation of approximately forty-five degrees engage in corresponding recesses in the housing. The recesses have a ramp latch at the entrance and a stop at the exit so that the lugs can be resiliently introduced into the recesses. Once in place the lugs are locked therein and prevent unauthorized disassembly. The inherent resilience of the plastic molded housing and cover allow the necessary camming action of the ramp latch without destroying either part. Once assembled, the ramp latch and stop prevent further rotation and removal of the cover from the housing except by use of special tools. The top of the housing is provided with a hinged cap that allows a lamp and socket to be displaced from within the interior of the otherwise sealed and locked assembly.

Abstract: An end cap for a rechargeable battery apparatus such as medical diagnostic instruments has a built-in diode arranged in series contact with the rechargeable NiCad battery so that current can flow in the battery charging direction only and the battery can not be discharged by shorting of the charging contact to the case.