on the connecting arm section 64b there is formed a fastening surface 86 facing the fastening surface 74 and having parallel ridges or ribs the fastening surfaces 74 and 86 can thus be drawn together so that the ribs can mesh by means of the fastening screw 78 thus permitting a longitudinal shifting of the bearing arm section 64a on the connecting arm 64b within the length of the slot 76 the connecting arm section 64b has a second fastening surface 88 which is the bottom of a groove 90 running parallel to the hinge pivot axis through the connecting section a slot 92 opening in the fastening section 88 is created through which a screw 94 fig5 can be driven into a tap 96 in a stub 98 of the mounting arm section 64c the stub being fitted in the groove like opening 90 the connecting arm section 64b is thus adjustable relative to the mounting arm 64c parallel to the hinge pivot axis within the range provided by the length of the slot 92 the adjustment being fixed by pressing together the fastening surface 88 of the connecting arm section 64b and the fastening surface 100 formed on the end face of the projection 98 here too ridges running transversely of the slot 92 are provided which can be brought into engagement in a complementary relationship.