forth so it can follow the exact course of the grate bars 5 which are not necessarily oriented exactly parallel to the pulling units 10 finally fig5 bottom view of the cleaning rake 6 shown in fig4 shows a possible position of the cleaning comb 12 on the support 11 for example it could be conceivable for the cleaning comb 12 to have one or several guiding mechanisms 16 e g in form of the slots shown penetrated by fixing agents 14 preferably the screws shown whereby the screws in turn engage in corresponding inner threads 20 of the support 11 for a smooth relative movement between support 11 and cleaning comb 12 it would naturally be advantageous if spacer rings not shown penetrated by the screws are provided in the slots so the screws can be tightened without fixing the cleaning comb 12 in a clamping way while doing so apart from that it should be pointed out that with regard to fig5 that a guiding mechanism 16 slot shown exclusively on the right is also present below the fixing agent 14 shown on the left and center likewise there is naturally also a one fixing agent 14 this was just removed in fig5 so the guiding mechanism 16 can be seen.