IL41998A - Electro-mechanical proximity fuse for projectiles - Google Patents

Claims (3)

1. A proximity fuse for missiles, including a body fitted on the nose of the missile and a cap revolvably carried by the body and provided with a cover forming a radome permeable to hyperfrequency radiation, said fuse being characterized by the fact that the radome is made of a deformable material and encloses a detecting aerial rigid with the compact electronic section adapted to slide inside the cap so as to form a striking plunger, while the mechanism includes a detonator-carrier adapted to slide transversely in the body under the action of a spring or of centrifugal force, said detonator-carrier being normally held in an inoperative position by the end of rod of an axial striker the fron tail-piece of which carries slidingly a striker weight urged forwardly by a spring and locked when inoperative by a first ball engaging an annular groove in said tailnpiece and held in its turn in position by a second ball or the like member adapted to move transversely and locked in its normal position by an arming weight adapted to move inside the cap along a line parallel with the striker and urged forwardl by a ferther spring, said arming weight including a rearward extension passing through said further spring, the weight on the striker being locked by means such as a circlips adapted to engage a further groove in the striker tail-piece after the striker weight has travelled sufficiently in a rearward direction upon firing of the missile and after the arming weight has itself bee shifted rearwardly through inertia and has thus released the balls whereby, the striker weight having first returned forwardly under the action of its spring, the front end of the striker tail-piece engages the striking plunger while the 41998/2 ^J striker rear tip releases the transverse movement of the detonator-carrier, so as to bring' the detonator in front of said tip and to close at the end of its stroke a switch controlling the electronic circuit, while an electric primer arranged in parallelism with the s riker communicates through channels formed in the ca and i the body with the main detonator when brought into its operative axial position, said primer being connected with the electronic detecting means through a delaying condenser, the whole arrangement being such that after a rotation through say 90° of the cap with reference to the fuse body, the channel in the cap connected with the electric .primer is out of registry with the corresponding channel in the fuse body whereby the first sequence of firing means is broken, while the rear tail-piece on the arming weight is out of registry with the port provided in the f se body for its collapse, so that the second sequence of firing means is also broken by the looking of the striker in its rearmost position, which, as a second safety, prevents the transverse movement of the detonator carrier and thereby breaks both pyrotechnical chains of sequential firing means and also the electric circuit.

2. A fuse as claimed in claim 1, wherein the electric circuit includes a general switch constituted by two elastic conductive blades into the interval between which may be inserted a conductive member provided with an annular retaining groove and rigid with the detonator-carrier.

3. A f se as claimed in claim 1, wherein the cap carries a block of plastics molded over the general switch controlling the electric circuit, over the condenser, over the electric primer and over their connections , said block extending rearwardly through an opening in the fuse body, which provides abutments for the rotation of the cap with reference to the body, the rearward extension of the block ending with connectihgyplugs engaging a further block of plastics molded over the battery and revolvably surrounding a tube forming a pyrotechnical relay between the detonator and a rear booster. For the Applicants DR. NERS HE:mr