ends of the bimetallic clamps 24 require that the bimetallic clamps 24 be distorted outward to permit the passage of the burner cup 12 past the inward deformations 32 and then the inward deformations 32 spring back behind the burner cup 12 and retain it in position against the biasing force of the return spring in the shroud 14 as the burner heats up the temperature transmitted to the bimetallic clamp 24 causes the bimetallic material to reduce its holding force in proportion to the temperature at some temperature the bimetallic clamp 24 is no longer able to hold the burner cup 12 against the force of the return spring not shown the burner cup 12 is thereupon drawn free of the bimetallic clamps 24 and the lighter 10 is ready for use an impatient driver or one who waits too long to withdraw the cigar lighter from the socket is inclined to reinsert the cigar lighter 10 in the socket 16 and hold the burner cup 12 in contact with the bimetallic clamp 24 and or the mechanical stop 26 until it again heats up or in fact overheats if the mechanical stop 26 is insulated with a high temperature ceramic material to prevent it from contributing to overheating of the burner the only remaining source of electricity is the bimetallic clamp 24 with the arrangement shown in the prior art of fig1 the bimetallic clamp 24 is capable of maintaining electrical contact with the burner cup 12 to.