12 to be retracted from a slot 26 a in frame member 14 when the lever is moved downward to unblock door 10 from locked position see fig2 extending the description to fig5 and 6 the knob 18 and handle may also have offset axes of pivoting 27 and 28 at the same vertical level as indicated fig1 and 14 show the latching mechanism to include a transverse shaft 35 carried by and within hollow upright frame member 14 and a linkage operatively connecting the shaft to the upper and lower lock rods 22 and 23 extending vertically and movable endwise to lock and unlock the doors in response to rotation of the shaft 35 in fig1 the shaft has been rotated counter clockwise to cause rotary link 36 to extend slider 22 c upwardly moving rod 22 upwardly into door locking position and to extend slider 23 c downwardly moving lower rod 23 downwardly into door locking position link 36 has pin and groove slidable connections at 36 a to slider 22 c and at 36 b to slider 23 c in fig1 the link 36 has been rotated by shaft 35 to retract the sliders and lock rods to door unblocking positions allowing door 11 opening and closing relative to the frame member 12 fig1 and 16 show spring means such as a tension spring 37 connected at 38 and 39 to the lock rods to positively urge them toward retracted position in conjunction with shaft rotation as by sudden unblocking rotary release of a blocking.