an elongated slot and the other link has a laterally projecting tongue which extends into the slot for movement along the slot one end of the slot has a stopping surface which is engaged by the tongue when the links are in the extended position for determining the swinging angle of the arm application_number US 17685688 A description the carrying and guiding system which is generally indicated by the reference numeral 2 includes arm 4 which is suspended for swinging movement about a pivot pin axis 5 at a stationary frame 1 two guide levers 8 and 9 are pivotally connected to the supporting arm 4 by means of two pivot pins 6 and 7 respectively the levers 8 and 9 are of equal length the guide levers 8 and 9 are in turn connected by pivot pins 10 or 11 respectively to a guide rail 12 the guide rail 12 is parallel with and secured to the closure member 3 the portion of the supporting arm 4 which lies between the pivot pins 6 and 7 forms with the two guide levers 8 and 9 as well as with the guide rail 12 a guide parallelogram which is generally indicated by the reference numeral 13 parallelogram 13 connects the closure member 3 with the stationary frame 1 the movement of the guide parallelogram 13 is affected through a control guide lever 14 one end of the control guide lever.