Abstract: A cabinet 10 has internal units which can be slid out of the cabinet on slides 12. The slides are mounted in slots 15 in the side walls 14, 16 of the cabinet. To prevent several of the units being slid out simultaneously, which may cause the cabinet to topple forward, a safety device 34 consisting of a number of blocking elements 36 on a guide 38 is arranged near one side of the entrance 20 to the cabinet 10. The guide 38 has a free length which enables the blocking elements to be slid along the guide to release one of the units, but which does not permit the blocking elements to be slid to release further units.