element 108 in the open position of fig4 the leading edge of detent spring 113 in conjunction with stop pin 115 holds locking element 108 with the lugs 119 withdrawn from the apertures 132 in the locked position of fig5 the leading edge of detent spring 113 applies pressure to the back of the bight of locking lugs 119 for purposes of illustration the security system of the invention has been described in a preferred embodiment with the security device attached to a door it has been supposed for development of this embodiment that it the intent of the user that no one should be able to access the secured premises from the outside the unique design of the security device of this invention lends itself to the inclusion of means whereby access from outside may be provided for emergency situations the device might be used to secure the door of a toilet room or compartment and access may be required upon indication that the occupant is in distress and needs assistance for such applications of the device a single hole 107 may be provided as shown in phantom outline in fig4 and 5 penetrating the door and mounting plate 111 this hole is positioned to permit entry of a shaft such as 106 through the door and into contact with the inside surface of latch handle 112 pushing upon such a shaft will easily effect rotation of handle 112 about hinge pin 114 and cause disengagement of the latch having described particular embodiments of the invention it will be appreciated that modifications will be apparent to those skilled in the art for example the unique features of the invention are suitable and are contemplated for latching other forms of relative moving members it is intended to include all.