(57) There is described a connecting unit (1) having a first and a second connector (2,
3) mutually connectable in a first direction (A); first and second coupling means
(18, 15) carried respectively by the first and second connector (2, 3) and which click
together, in the first direction (A), into a coupled position; and coupling detecting
means (36) mounted to slide, along the first connector (2) and in the first direction
(A), between a preassembly position and a fully assembled position, and having a disabling
arm (50) flexible elastically in a second direction (B) crosswise to the first direction
(A), and normally set in an undeformed configuration in which it presses against the
first coupling means (18) to prevent the fully assembled position from being reached;
the second coupling means (15) having an opposing surface (22), which, in the coupled
position, defines a temporary stop for an interacting portion (55) of the disabling
arm (50) as the coupling detecting means (36) move into the fully assembled position,
and which is cam-shaped to flex the disabling arm (50) and to be passed over by the
interacting portion (55) only when additional thrust is exerted on the coupling detecting
means (36) in the first direction (A).
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