Disclosed is a device comprising a base part (2) and a top part (7) that can be joined to the base part (2) via a releasable locking connection (16). The locking connection (16) is provided with at least one catch (18, 19) that is attached to a locking web (20) and engages with a thrust bearing section (21) in a closed position, and a releasing mechanism which acts upon the locking connection (16) and causes the engagement of the or each catch (18, 19) to be canceled when being actuated. The locking connection (16) is also provided with a flexible pressure latch (11) which is recessed in the top part (7). A latch rib (15), under the effect of which the engagement of the or each catch (18, 19) is canceled, is molded onto the side of the pressure latch (11) facing the or each catch (18, 19), whereby a very simple and safe mechanical structure is obtained, resulting in a relatively low production cost.