centrally located through the body 1 is circular opening 1c which communicated with milled recesses 1a and 1b these are provided to receive helical spring 4 with its ends 4a and 4b protruding through the recesses 1a and 1b respectively to engage the stationary pins 3a and 3b mentioned above the catch unit 6 here shown attached to the door of a cabinet as described below but such a catch unit may be part of any other mechanical movement which it is desired to latch and unlatch forming an integral part of body 1 is tongue 7 having a convex cam surface 7a which operates on opening of the door and flat surface 7b which operates on closing of the door the surfaces meeting at catch point p as described more fully below the installation of my device on a cabinet is best seen on fig1 wherein 8 shows the side of the cabinet 9 the door and 9a the handle as employed in this embodiment the body 1 is located within latch housing 10 in which there is a snug sliding fit the housing is provided with holes 11 through which screws 11a effect fastening of the device to the floor of the cabinet 17 holes 12 in.