bearing arm in such a way that the corresponding teat cup 3 can be fitted on a teat wherein each bearing arm is essentially horizontal and can be slit parallel to each rotarty shaft the rotary shaft 20 of the bearing arms can be suspended from a common telescopic supporting structure 12 13 for inserting or removing the teat cups at the rear side of the animal to be milked between its hind legs application_number US 90139392 A description fig1 shows two bearing arms i e the lower bearing arm 1 and the upper bearing arm 2 bearing the teat cups 3 4 respectively for the right teats of an animal to be milked these bearing arms 1 2 are supported in a sub frame indicated in its entirety by 5 this sub frame forms a part of the overall frame 6 which also contains a sub frame 7 for supporting the bearing arms 8 9 with teat cups 10 11 for the left teats of the animal since these bearing arms are mirror symmetrically identical i e arm 1 is identical to arm 8 and arm 2 is identical to arm 9 attention will be focused on arms 1 and 2 below but the description thereof also applies directly to arms 8 and 9 the bearing arm 1 comprises telescopic parts 12 13 and the bearing arm 2 comprises telescopic parts 14 15 the telescopic parts thown possess a.