EP0026348B1 - Plurally protected underwater fuse - Google Patents

Description

The invention relates to an underwater detonator with the features of the preamble of claim 1.

Such a, from DE-A. 25 30 707 known underwater detonator or the like, for example, for an explosive gripper pulled by a tow rope for underwater capping the anchor chains of sea mines. uses and has a release plate to be actuated by the anchor chain, which, when subjected to sufficiently high mechanical pressure, punctures a shear protection and thereby releases the ignition mechanism, provided that the water pressure safety device has been actuated and an ignition needle lock has been released.

The known arrangement thus has a total of three fuses which are to be actuated in succession in order to trigger the ignition, namely an unsecured pin fuse for the release plate, a water pressure fuse for the ignition needle and a shear fuse, the cancellation of which by mechanical pressure forces immediately Ignition triggers.

It seems reasonable that such an underwater detonator is well suited for the intended purpose with an explosive gripper pulled by a tow rope for clearing mines, but cannot be used for all possible purposes of explosive charges in which mechanical pressure is undesirable for any reason or is not possible.

From DE-B-10 86 595 a water pressure safety device is known in which a trigger pin is blocked by means of a pin, the pin being provided at one end with a releasable securing element and at the other end being connectable with a pull rope. This patent specification therefore shows only a partial feature of the preamble according to claim 1, roughly corresponding to DE-A-25 30 707.

US-A-4,015,533 discloses a positive sequence release with two pressure-sensitive safety devices which respond to prints of different heights. This safety device is not suitable for underwater use. It requires a pressure generator that allows impulses of different pressure for pressure drops to enter a vestibule of the housing through a line. There is no indication of a fuse that responds to the continuously increasing pressure when immersed in deeper water.

The invention is therefore based on the object to provide an underwater detonator of the type specified, which is triggered instead of the mechanical pressure release by a certain signal, which is received via an electronic part of the detonator and processed as an ignition signal and has an increased security of its unlocking mechanism before it comes into focus.

The solution according to the invention consists in designing an underwater detonator of the type specified so that the detonator, as actuators to be actuated one after the other, for the forced sequence unlocking, a safety plug with a warning flag for a pin, a first water pressure safety device which blocks a rotary movement of the rotor into the ignition position Pin fuse that blocks every movement of a trigger pin, and a second water pressure fuse that blocks a displacement of the trigger pin and a rotation of the rotor to the ignition position and works independently of the first water pressure fuse. Further features of the underwater igniter according to the invention are specified in the subclaims.

The underwater igniter according to the invention advantageously provides a particularly safe arrangement which has a total of four mechanical safeguards operating independently of one another, all of which must be unlocked in the order specified in order to enable the ignition. However, even if all four fuses have been unlocked, the explosive charge is not automatically ignited, since the ignition pulse must still be supplied by the electronic part of the detonator for this purpose. Here, further safety options are available in that only very special signals are able to cause the electronics to trigger the ignition pulse.

In connection with the elimination of a mechanical pressure release, an increased protection is achieved in that a second water pressure protection device is introduced which operates at a higher water pressure than the first protection device. The logical linkage of mechanical processes that is possible as a result ensures that the mechanics of the detonator only unlock when the functional processes take place in the constructively predetermined sequence.

If the underwater igniter according to the invention is not actuated in the specified sequence of its safeguards, ignition of the igniter is excluded. E.g. the safety plug is not removed before the detonator is deployed into the water, so the first water pressure safety device can work and release the end of the rotor assigned to it, but the rotor remains in its rest position even if the water pressure safety device is sufficient for the second water pressure safety device, since the pre-plug not pulled and so the trigger pin can not be operated.

If the safety plug is removed properly and the pin is pulled in air or in a shallow water depth, ignition is also prevented because the spring-loaded rotor then rotates about its axis in such a way that the guide pin on the one hand the first water pressure safety device runs into its blind position and, on the other hand, the trigger pin is pushed out and comes into contact with the outer surface of the rotor, where it can no longer turn the rotor. This means that in such a case there is an irreversible blind position from which the rotor can no longer move, even if the detonator is subsequently successively exposed to suitable water pressures.

• Fig. 1 eine Seitenansicht des Unterwasserzünders, teilweise im Schnitt;
• Fig. 2 eine Seitenansicht des Unterwasserzünders nach Fig. 1 von rechts;
• Fig. 3 eine weitere Seitenansicht des Unterwasserzünders, teilweise im Schnitt längs einer senkrecht zur Ebene der Fig. 1 verlaufenden Ebene;
• Fig. 4 einen Schnitt durch den Rotor und den Kolben der zweiten Wasserdrucksicherung längs der Ebene IV-IV der Fig. 3;
• Fig. 5 einen Schnitt durch den Rotor und den Kolben der zweiten Wasserdrucksicherung längs der Linien V-V der Fig. 4;
• Fig. 6 eine Seitenansicht, teilweise im Schnitt, des Rotors;
• Fig. 7 einen Schnitt des Rotors längs der Ebene VII-VII der Fig. 6;
• Fig. 8 einen Schnitt des Rotors längs der Linien VIII-VIII;
• Fig. 9 eine Draufsicht auf den Rotor in axialer Richtung längs der Linien IX-IX der Fig. 6.

The invention is explained below with reference to the description of exemplary embodiments and with reference to the accompanying drawings. The drawing shows in

• Figure 1 is a side view of the underwater detonator, partially in section.
• FIG. 2 shows a side view of the underwater detonator according to FIG. 1 from the right;
• 3 shows a further side view of the underwater detonator, partly in section along a plane perpendicular to the plane of FIG. 1;
• 4 shows a section through the rotor and the piston of the second water pressure safety device along the plane IV-IV of FIG. 3;
• 5 shows a section through the rotor and the piston of the second water pressure safety device along the lines VV of FIG. 4;
• 6 is a side view, partly in section, of the rotor;
• Fig. 7 is a section of the rotor along the plane VII-VII of Fig. 6;
• 8 shows a section of the rotor along lines VIII-VIII;
• 9 is a plan view of the rotor in the axial direction along the lines IX-IX of FIG. 6th

Structure of the detonator

The entire detonator is housed in a housing 10 and, as the main assemblies, has, in addition to an electronic insert 59, a first water pressure safety device 44, a second water pressure safety device 54, a plug pin 69, a trigger pin 34, a rotor 1 with a detonator 115, a contact pin 25, an ignition amplifier 6, a transfer charge 5 and a main charge 7.

On the front of the housing 10, a closure piece 3 can be seen as a holder for the trigger pin 34 and the pin 69, which is tightly installed in the housing 10. The closure piece 3 is tubular and closed at its front end with a sealed closure 42. Two aligned, aligned bores 68, which receive O-rings as seals 70, run transversely to the axis of the closure piece 3. A corresponding circumferential groove 68a on the release pin 34 is aligned with the bores 68 in the rest position of the igniter, so that the pin 69 can be inserted.

In the arrangement according to FIG. 1, the pin 69 pushed through the bores 68 can be seen, which is supported on the closure piece 3 by its collar 69a. The pin 69 has at its lower end an eyelet 64 which receives a safety pin 63 provided with a warning flag 63a, which prevents the pin 69 from being pulled out. At the upper end of the pin 69, an eyelet 67 is provided, to which a pull rope 65 is fastened, with which the pin 69 can be pulled out as soon as the safety plug 63 is removed.

The trigger pin 34 is mounted in its central region on the piston 36 of the second water pressure safety device 54, which has an elastic membrane 37 which is mounted on the piston 36 with a disk 38. The membrane 37 is expediently designed as a rolling membrane and attached to a tube 41 on its outer circumference. On its side facing the rotor 1, the piston 36 carries a circuit board 28 which is provided for engagement with two pairs of contact pins 31 and forms a switch for the electrical part of the igniter with this. This switch, which consists of contact pins 31 and circuit board 28, can, for example, close the electrical ignition circuit via lines 95, plug connections 97 and 98, lines 96, plug connections 99 and 100 and lines 94 and connect them to the schematically illustrated electronic insert 59 and for a voltage supply via a battery 40 to care. The electrical lines and contacts are housed in the housing 10 in an insulated manner, while a detachable closure 61, which is provided with seals 75 and 76, provides access to the electronics insert 59 and the battery 40. A prerequisite for closing the electrical ignition circuit, however, is that the structurally predetermined sequence be followed when the individual fuses of the igniter are actuated, because the circuit board 28 closing the contact pins 31 is part of the second water pressure fuse 54, which is actuated last by all the fuses.

As can be seen from FIGS. 1 and 3, the rotor 1 with its support surface 110 is in engagement with the release pin 34. In the rest position shown in FIG. 1, the detonator 115 of the rotor 1 is short-circuited because of the electromagnetic compatibility via a contact pin 11 which is prestressed with a compression spring 12. This short-circuit bridge is separated into its ignition position when the rotor 1 is rotated by approximately 90 °. Similarly, in the arrangement shown in FIG. 3, the contact pin 25 accommodated in an insulating sleeve 24 bears against the rotor shaft 107 and is short-circuited via it.

The rotor 1 itself is rotatably supported by its upper and lower bearing pins 118 and 119, the bearing pins ensuring low friction. At its upper end, the rotor 1 is provided with a spiral spring 15, which is housed in a spring housing 16, which in turn is held by a rotor locking screw 17, which is sealed with a seal 72 is used. The spiral spring 15 fastened to the rotor 1 and the spring housing 16 prestresses the rotor 1 in a clockwise direction, the number of rotations of the spring housing 16 lockable with a pin 91 determining the pretensioning force of the spiral spring 15, with which it presses against the release pin 34 and rotates of the rotor 1 counteracts in the ignition position.

The trigger pin 34 is thus clamped in the rest position between the bearing surface 110 of the preloaded rotor 1 and the plug-in pin 69. So that with sufficient water pressure and pulled pin 69 of the rotor 1 can be rotated into the ignition position, the force exerted by the spiral spring 15 must be overcome so that with the bias of the spiral spring 15 the water depth can be specified in which the detonator is armed can graze because the water pressure increases with depth.

3 shows the first water pressure safety device 44, which is connected to a sieve 47 (FIG. 2) via bushings 45 with a slight slope. Through these openings, the water through the sieve 47 and the bushings 45 can act on a membrane 19 which is biased outwards with a conical spring 18 which surrounds a piston 2. The membrane 19 is closed to the outside with a closure 20 which is sealed with a seal 73.

On the side opposite the pin 69 one can see the main charge 7 enclosed by a casing 5, which is fastened to the housing 10 by means of screws 89 and a sealed cover 66. The ignition amplifier 6 is ignited in the ignition position of the rotor 1 by the detonator 115.

The interaction of the piston 2 of the first water pressure safety device 44 with the rotor 1 is shown in more detail in FIGS. 4 and 5. The piston 2 has on its upper side a radially outwardly projecting radial guide pin 201 which engages with the guide groove 101 of the rotor 1 and is displaceable therein. The rotor 1 itself is shown in FIGS. 6 to 9 in detail. In the vicinity of the upper bearing pin 119, a cylinder part 126 can be seen, around which the spiral spring 15 is wound. This is followed by a cylindrical rotor body 106 of larger diameter. As the section of the rotor body 106 shown in FIG. 7 shows, two asymmetrical projections 113 and 114 extend outward from the central, solid region of the rotor body 106 to the outer circumference 124 of the rotor body 106. These projections 113 and 114 form stops 111 on one side to engage with a pin, not shown, and limit the rotary movement of the rotor 1. On the other side, the projections 113 and 114 form the abovementioned support surface 110 for the trigger pin 34. This support surface 110 consists of two rectilinear areas 120 and 123, which have a arcuate recess 122 are connected to one another, while a straight bevel 121 adjoins the rectilinear region 120 at an obtuse angle and runs to the outer circumference 124 of the rotor body 106.

In the assembled state, the trigger pin 34 is seated on the rectilinear region 120, that is to say in an eccentric position. If, after pulling the pin 69, the spring force of the spiral spring 15 is greater than the force exerted by the release pin 34 on the support surface 110, the rotor 1 rotates clockwise and presses out the release pin 34 guided in the ring 27 and in the closure piece 3. The front end of the release pin 34 slides from the rectilinear region 120 via the bevel 121 onto the outer circumference 124 of the rotor body 106 and then no longer has any possibility of rotating the rotor.

Conversely, if the force exerted by the trigger pin 34 on the bearing surface 110 is greater than the spring force of the spiral spring 15, the rotor 1 rotates counterclockwise, the eccentrically arranged trigger pin 34 sliding with its front end along the bearing surface 110. Since the trigger pin 34 has a finite width, the arcuate recess 122 prevents the rotor 1 and the trigger pin 34 from wedging, since the cross section of the trigger pin 34 is taken into account. In this way, the trigger pin 34 can rotate the rotor 1 through an angle of 90 ° into the ignition position.

The rotor shaft 107 adjoins the rotor body 106, which has a radical through bore which receives the detonator 115, which is provided with a bushing 116. In the vicinity of the lower bearing pin 118 one can see the guide groove 101, which essentially consists of three areas, namely an outer ring 102 as a blind adjusting groove, an inner ring 104 as a focusing groove and an axial recess 103, which connect the outer ring 102 and the inner ring 104 to one another extend from the axial recess 103 in the circumferential direction in opposite directions and in this way form two circular-arc-shaped tracks. The outer ring 102 is delimited by the two stops 108 and 109, while the inner ring 104 extends over a longer circular arc and has a stop 105.

As can be seen from the top view of the rotor 1 according to FIG. 9, the guide pin 201 which engages with the guide groove 101 can only move in the axial direction if it is in the vicinity of the stop 108 and aligned with the axial recess 103 is. If it is too close to the other stop 109 in the outer ring 102, it cannot move in the axial direction because it then strikes against the axial stop 125. So if the rotor 1 is rotated clockwise by the force of the spiral spring 1, the guide pin 201 on the piston 2 runs against the stop 109 and is thus also in front of the axial stop 125, so that the later actuation of the first Water pressure safety device 44 cannot move the guide pin 201 in the axial direction.

Mode of action

The igniter described above works as follows. Before the detonator is let into the water, the safety plug 63 with its warning flag 63a on the plug connector 69 is removed and kept by the operating personnel for control purposes in order to have an overview of the detonators and explosive charges that have been exposed. The detonator is then lowered into the water and brought to its location in a suitable vehicle. At this time, the individual assemblies of the detonator assume the rest position shown in FIGS. 1 and 3 to 5, in which the guide pin 201 is located in the outer ring 102 and bears against the stop 108, so that it is aligned with the axial recess 103.

As the depth of the water increases, the membrane 19, which is biased by the conical spring 18, is acted upon to an increasing extent by penetrating water from the sieve 47 and the bushings 45 and is pressed into the interior of the housing 10. At the same time, the piston 2 and the guide pin 201 fastened thereon are advanced in the axial recess 103 until it comes to bear against the inner side wall of the inner ring 104. While the guide pin 201 rests against the stop 108 in its rest position and thus blocks a rotary movement of the rotor 1 clockwise into the ignition position, the guide pin 201 now has no resistance in the inner ring against rotation of the rotor 1 in the counterclockwise direction, so that the rotor 1 overcomes it the spring force of the coil spring 15 can be turned to the arming or ignition position.

As soon as the predetermined water depth is reached, which actuates the first water pressure safety device and has pushed the guide pin 201 into the inner ring 104 as a focusing groove, the pin 69 can be pulled with the pull rope 65 when the functional water depth of the second water pressure safety device is reached, without the pre-tensioned rotor 1 can push out the release pin 34, because now the guide pin 201 lies in the axial recess 103 against the stop 105 and prevents a corresponding rotation of the rotor 1 in the clockwise direction.

When the pin 69 is pulled out, the bores 68 form water inlet openings to act on the membrane of the second water pressure safety device 54, but prevent an abrupt load on the membrane, so that no damage and deformation can occur. The trigger pin 34 is pressed inward by the water pressure on the membrane 37 and rotates the rotor 1 by an angle of 90 °, the trigger pin 34 sliding along the bearing surface 110 provided with the arcuate recess 122 without the risk of wedging . If the rotor 1 has been rotated by 90 °, the detonator 115 is opposite the contact pin 25, which contacts the detonator 115 via its compression spring 26.

Simultaneously with the pushing-in of the trigger pin 34, the board 28 mounted on the piston 36 is advanced until it bridges the contact pins 31. The contact pins 31 are accommodated in the contact pin housing 8, which in turn is mounted with fastening pins 85 and 86. The contact pins 31 are acted upon by springs 32, which ensure reliable contact with the circuit board 28 on the one side and are connected on the other side to a contact circuit board 35, which in turn is electrically connected to the lines 85 in order to at this point Close circuit.

Pulling the pin 69 in air or in too shallow water has the result that the rotor 1 with its detonator 115 comes into an irreversible blind position, in which the trigger pin disengages from the contact surface 110 of the rotor 1, while the guide pin 201 des Piston 2 of the first water pressure safety device 44 moves into its blind adjustment groove.

As the above explanations show, the rotor 1 is a very essential component of the novel igniter, the shape of the guide groove 101 playing an important role. If the guide groove 101 is unwound in one plane, one has to imagine this guide groove as a stylized S, the upper and lower bars (inner ring 104 and outer ring 102) each connecting the vertical bars (axial recess 103) at a right angle .

When the igniter is in the rest position, the guide pin 201 is located at the outer end of the axial recess 103 and thus at the same time in the outer ring 102, wherein it rests against the stop 108. In this rest position, the guide pin 201 performs a double function: Firstly, it prevents the rotor 1 from rotating counterclockwise into the arming position because this rotation would be premature because the intended water pressure that actuates the first water pressure safety device 44 has not yet been built up. On the other hand, the guide pin 201 is prepared in this rest position for being pushed into the arming position, provided the required water pressure is exerted on the first water pressure safety device 44.

If the first water pressure safety device 44 has been actuated properly, the guide pin 201 has moved along the axial recess 103 into the inner ring 104 as a focusing groove and the guide pin 201 bears against the stop 105 and prevents the rotor 1 from rotating clockwise, by which the Trigger pin 34 would be pushed out after pulling the pin 69, since a pressure must first build up over the membrane 37 of the second water pressure safety device after pulling the pin 69 before the trigger pin 34 can pivot the rotor 1 into the ignition position against the force of the coil spring 15.

In the event that actuation of the pin 69 has occurred too early and the rotor 1 has rotated clockwise, there has been a relative movement between the guide pin 201 and the rotor 1, which engages the guide pin 201 on the outer ring 102 against the radial stop 109 brought. This position also has a dual function, because on the one hand the stop 109 prevents further rotation of the rotor 1 and on the other hand the axial stop 125 opposite the guide pin 201 limits the axial movement of the guide pin 201 and prevents the guide pin 201 from now still into the inner ring 104 can reach as focusing groove, since the rotor 1 is preloaded accordingly with its spiral spring 15.

As already mentioned, the igniter does not necessarily have to be fired even when the rotor has turned to the arming position, because the ignition itself is dependent on the receipt of a suitable firing pulse at the receiving part of the electronics module 59. If a received ignition pulse is not compatible with the ignition electronics or if no ignition pulse is received at all, the ignition will fail to appear in these cases. After a certain standby time, the ignition electronics themselves destroy themselves, thus ensuring that after this time the igniter cannot function.

It should also be pointed out that the detonator described above is also insensitive to any arbitrary manipulation. The first water pressure safety device 44 is located far inside the housing 10. Its water feedthroughs 45 are connected to the sieve 47 on the front side of the detonator via an obliquely sloping channel that allows the water to flow away (cf. FIG. 2). The second water pressure safety device 54 is located in an inaccessible place inside the housing 10 and can only be acted upon via the release pin 34 or the water entering through the bores 68 and 68a over a small cross section. If manipulation is attempted at this point, this requires the pin 69 to be pulled out, which, however, leads in the manner indicated that the rotor 1 rotates into its blind position and makes ignition of the igniter impossible because the rotor 1 with its spiral spring 15 is biased accordingly. In this way, the igniter described above is an extremely safe arrangement that also meets the highest requirements.

Claims (17)

1. An underwater fuse for detonating an explosive charge by means of a spring-loaded rotor pivotable through release of a pin, the rotor containing a detonator, sliding movement of the release pin being locked by a safety pin possibly secured by means of a securing pin, the pivoting movement of the rotor being lockable by a water-pressure safety fuse device, characterized by the following features:-

(a) a second water pressure safety device (54) is associated with the release pin (34) in such a way that it cannot be actuated by water pressure until after the safety pin (69) has been pulled and the rotor (1) cannot be moved by the said safety device into the detonating position until after the first water-pressure safety device (44) has taken effect;

(b) parallel to the release pin (34) a spring-loaded contact pin (25) is arranged so that it bears against the rotor shaft (107) of the rotor (1) and cannot penetrate the detonator (115) until after the rotor (1) has been pivoted into the detonating position, the detonation contact being thereby accessible,

(c) the housing (10) of the fuse having a battery (58) and an electronic detonator system (59) responsive to a signal and connected by conductors (95, 96) with a switch of which the detonation contacts (31) can be closed when the release pin (34) is thrust into the detonation position, whereby the contact pin (25) can be connected with the electronic detonator system (59) to receive a detonation signal.

2. An underwater fuse in accordance with Claim 1, characterized by the fact that the first water-pressure safety device (44, 18-20, 2) actuated by water pressure through a diaphragm (19) and a spring (18) has a displaceable piston (2) of which a guide pin (201) projects transversally to engage and be movable in a guide groove (101) of the rotor (1).

3. An underwater fuse in accordance with Claim 2, characterized by the fact that the guide groove (101) of the rotor (1) has an outer ring (102) and an inner ring (104) separate therefrom, the rings being interconnected via an axial recess (103).

4. An underwater fuse in accordance with Claim 3, characterized by the fact that the outer ring (102) forms a disarming groove and the inner ring (104) forms an arming groove, the axial recess (103) forming the only connection between the grooves.

5. An underwater fuse in accordance with one of Claims 2 to 4, characterized by the fact that the outer ring (102) and the inner ring (104) of the guide groove (101) extending from the axial recess (103) extend in opposite directions over the periphery and form two arcuate paths each delimited by stops (108, 109, 105).

6. An underwater fuse in accordance with one of Claims 1 to 5 characterized by the fact that the guide pin (201) of the piston (2) of the first water pressure safety device (44) can only be pushed into the arming groove (104) on operation of the piston (2) and the diaphragm (19) when in the position axially aligned with axial recess (103) by sufficient water pressure.

7. An underwater fuse in accordance with one of Claims 1 to 6, characterized by the fact that the rotor (1) is prestressed by a spring (15) which when the release pin (34) is released to air turns the rotor (1) so that the piston, actuated by inadequate water pressure, moves by means of the guide pin (201) in the outer ring (102) of the guide groove (101) into the disarmed position (109, 125) and is blocked against axial displacement when pressure subsequently builds up on the diaphragm (19).

8. An underwater fuse in accordance with one of Claims 1 to 7, characterized by the fact that the rotor (1) has stops (111) which delimit the rotatory movement in both peripheral directions.

9. An underwater fuse in accordance with one of Claims 1 to 8, characterized by the fact that an end of the release pin (34) has a peripheral groove (68a) extending transversally to the axis, the mount (3) housing same having corresponding borings (68) in which is tightly mounted a safety pin (69) passing therethrough.

10. An underwater fuse in accordance with Claim 9, characterized by the fact that the safety pin (69) has an eye (64) at the insertable end and accommodating the safety plug (63) with a warning lug (63a) the other end of the safety pin (69) being connected to a traction cable (65).

11. An underwater fuse in accordance with Claim 9 or 10, characterized by the fact that the borings (68) in the mount (3) of the release pin (34) when the safety pin (69) is withdrawn, form water inlet apertures of small cross section, serving to actuate the diaphragm (37) and the piston (36) of the second water-pressure safety device (54).

12. An underwater fuse in accordance with one of Claims 1 to 11 characterized by the fact that the release pin (34) in the rest position and at the end facing away from the safety pin (69) engages the bearing surface (110) of the rotor transversally to the axis and eccentrically, and that it is only when the water pressure acting via diaphragm (37) is sufficiently high that the release pin exerts on the rotor (1) a rotatory force which overcomes prestressing of the latter and rotates it to the detonating position.

13. An underwater fuse in accordance with one of Claims 1 to 12 characterized by the fact that the force of the spring (15) prestressing the rotor (1) and thus the necessary water pressure for nullifying the second water pressure safety device (54) are adjustable.

14. An underwater fuse in accordance with Claim 13, characterized by the fact that the spring (15) is in the form of a spiral spring and is situated in a spring housing (16) of which the number of turns in relation to the housing (10) of the fuse determines the resilient force of the spring (15).

15. An underwater fuse in accordance with one of Claims 1 to 14, characterized by the fact that the spring (15) turns the rotor (1) on release of the pin (34) in the event of insufficient water pressure and pushes the release pin (34) out, so that its front end slides over a slanting part (121) onto the outer periphery (124) of the rotor body (106) and disengages from the bearing surface (110).

16. An underwater fuse in accordance with one of Claims 1 to 15, characterized by the fact that the bearing surface (11) of the rotor (1) is positioned eccentrically and has two rectilinear zones (12), (123) which are interconnected via an arcuate recess (122), the angled part (121 extending at an obtuse angle to the outer periphery (124) of the rotor (1).

17. An underwater fuse in accordance with Claim 16, characterized by the fact that the detonator (15), when the fuse is in disarmed position, is short-circuited by a bridge (11, 12) which is broken when the rotor (1) turns into the detonation position.

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