seat 30 towards the shallowest part 29 u2032 of the section 29 and the spring 72 pushes it into the position d by removing the external force on the furniture part the helical spring 53 pushes the slider 52 towards the outside and the ball 73 travels along the sections 31 and 32 passing beyond the ramp 33 and the step 34 returning to the initial condition a wherein the furniture part is released advantageously the hooking element can be constituted by a cavity 61 partly open towards the opposed flat surfaces so as to easily produce the hooking edge 62 even with a moulding process the bottom 63 constitutes the thrust element of the hook 68 when the latch is in operation making it slide in combination with the oblique movement in the inclined direction of the angle u03b1 until it is positioned behind the hooking edge 62 as shown in fig2 and 6 the cover 54 is also provided with shanks 76 suitable to be housed in corresponding holes 75 of the container 51 to allow integral assembly of the two parts an embodiment of the latch conforming to the invention is shown in fig6 and 7 the container 81.