the arrangement of fluid conduits and lines for electrical or optical transmission of power and or data in fig3 the shelf 80 is shown in a position in which it is not yet connected to the columns 30 40 of the medical equipment trolley 10 in particular the engagement hooks 81 on the sides of the shelf 80 and the pin 89 on the rear edge of the shelf 80 do not yet engage in the openings 72 arrows indicate a movement of the shelf 80 in particular of the engagement hooks 81 and of the pin 89 into the openings 72 with which movement the shelf 80 can be connected mechanically to the columns 30 40 and thus to the medical equipment trolley 10 the engagement hooks 81 are formed for example by sheet metal strips in the example shown by bent metal strips each engagement hook 81 is rigidly connected to the shelf 80 by means of two rivets 84 one or more screw heads 88 of screws are arranged between the rivets and between the engagement hook 81 and the shelf 80 in each case which screws are screwed either into the engagement hook 81 or into the edge of the shelf 80 the function of this screw head 88 is described with reference to fig4 6 and 8 and in particular fig9 a slide 85 with two bolts 86 is.