Patent ID: 7695336

Claim:
A device for introducing an accurately dosable amount of mercury into the discharge vessel of lamps, comprising at least one lamp receptacle, to which the discharge vessel is attached, wherein the lamp receptacle exhibits a feed channel, which communicates with the interior of the discharge vessel, and wherein there is a dosing unit comprising a first, rotational section and a second, stationary section disposed along a common axis, which pre-doses a predetermined amount of mercury in a dosed volume and delivers the amount of mercury that was pre-dosed in the dosed volume to the feed channel for the purpose of introducing into the discharge vessel, wherein the dosed volume is dimensioned in such a manner that the mercury therein forms into a single drop, and wherein the dosing unit comprises a change-over mechanism in order to at least one of block or reroute a gas stream, flowing through a bypass channel past the dosed volume.