Box for containing electrical mechanisms

Claim 1

A box for containing electrical mechanisms which may be installed in channel-like duct members for electrical wiring or the like which comprise a bottom with which there is associated at least one first and one second oppositely facing harpoon-shaped projections, which are attached to the bottom by at least one rib portion, said box having a base and side walls, said box being formed by a single piece comprising: legs for supporting on the bottom of the channel-like duct member; a fixed positioning appendage adapted to engage below said first harpoon-shaped projection; an aperture in said base defining first and second opposed edges; a neb-like ridge adjacent said first edge having first locking means; a wall portion adjacent said second edge; and a locking tab hingedly connected to said wall portion, capable of pivoting between a lower locking position and an upper free position, said tab comprising in turn: an upper portion having second locking means complementary to said first locking means adapted jointly removeably to retain said tab in said lower locking position; and a lower portion having a retaining appendage adapted to engage below said second harpoon-shaped projection when said tab is in said lower locking position.