Abstract: A coupling set for interlocking objects. The set comprises first and second oupling elements each having an integral stud by which it is anchored in one of two objects to be interlocked. The first locking member has a swingable latch comprising a notch and a spring member. In the locking position the notch of latch engages the stud of the second locking member and the spring member snaps into a cavity in the head portion of the second locking member.

Abstract: A safetied demolition charge fuze of the kind that upon actuation switches rom a safe to an armed state. Double safety means are provided to ensure the subsistence of a predetermined delay time. A detonator ignitable via a pyrotechnic delay charge is located within a safe-and-arm slide. In the safe state, the detonator is out of alignment with the pyrotechnic charge due to the safe position of the safe-and-arm slide. The latter is retained in the non-aligned, safe position by means of a retainer shaft which is locked in the retaining position by a heat sensitive defense mechanism. After a predetermined time delay, heat transferred from the burning pyrotechnic delay charge cause the latter to unlock and release the retainer shaft which thereupon and by yielding to its compression spring, clears the safe-and-arm slide. In consequence and by the action of springs associated with the slide the latter is urged to the armed position at which the detonator is aligned with the pyrotechnic delay charge.