A locking device is provided in order to prevent a ceiling-mounted stand comprising one or two arms and one stand head and being part of a ceiling-mounted medical supply unit from falling down should a pivot connection of two arms tear apart. The locking device comprises at least two shell segments (1) that reach around the pivot connection and are provided with a first and a second segment end (3, 4) and with an upper and a lower edge (5, 6) adjacent to each of which an engaging section (7, 8) facing the pivot connection is provided, as well as an upper and a lower washer (9, 29) that is assembled of at least first and second washer segments (11, 12) that are, in the installed state, connected to the pivot connection above and below said pivot connection, whereby the washer segments each comprise engaging sections (13, 14) that are associated with the engaging sections (7, 8) of the shell segments.

A quick connect electrical junction box assembly for receipt and support of electrical appliances including a first support member adapted to be attached to a building, the first support member having a female electrical receptacle connected thereto, a second support member to support an electrical appliance, the second support member having a male electrical plug rotatably connected thereto, the male electrical plug being adapted to be received in the female electrical receptacle to make an electrical connection between first support member and the second support member, the second support member having at least one load bearing connector, the load bearing connector being adapted to be received in the first support member to connect the second support member to the first support member, the load bearing connector being spaced apart from the male electrical plug.