Frame assembly (1) comprising at least a first frame member (2) joined together with a second frame member (4). The first frame member (2) comprises a stepped first end section (9) comprising a first end surface (10) and a second end surface (11) at an angle to the first end surface (10). The second frame member (4) comprises a third end surface (15) perpendicular to the fourth end surface (16). The first end surface (10) comprises a pin (7) intended to be inserted into a hole (8) in the third end surface (15), or vice versa. The pin (7) and/or the hole (8) comprises an upper part (17, 22) that is chamfered in such a way that, when the pin (7) is inserted into the hole (8) and the third end surface (15) is moved towards the first end surface (10), the second frame member (4) is moved in the direction towards the second end surface (11) by the action of the chamfered upper part (17, 22).
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