doors 5 having cremone bolt latching mechanisms 10 in accordance with the present invention attached thereto fig2 is a front elevation view of the pair of cremone bolts latching mechanisms 10 as would be attached to a pair of doors the doors are not shown for clarity cremone bolt operators 14 of the latching mechanisms 10 use mechanisms that rotate ninety degrees to retract the cremone bolts for use with door levers 12 typically it is desirable for cremone bolt latching assemblies 10 to have levers 12 that only rotate 90 degrees such that the levers 12 when fully rotated do not protrude into the space of a facing door since sufficient leverage is obtainable by a lever type door handle the smaller angle of rotation provides for an adequate force applied to the spring tension to disengage the bolts of the latching mechanism 10 fig3 is a front elevation view of a pair of cremone bolt latching mechanisms 10 as would be attached to a pair of doors again the doors are not shown for clarity here the cremone bolt operators 14 use mechanisms that rotate one hundred eighty degrees to retract the cremone bolts 16 for use with door knobs 18 here shown as oval shaped knobs contrary to the requirements of the operator as configured in fig2 a one hundred eighty degree rotation of the door knobs 18 is desirable such that sufficient leverage is obtained to open.