FR2698958A1 - Safety device for ammunition. - Google Patents

Abstract

The invention relates to a safety device (10) for a munition, in particular for a homing ammunition, which comprises a housing (12) in which is mounted a slide (14) which can move between a safety position and a position. army. The slide (14) is provided with an ignition means (16) which is in contact with an electronic ignition device (18) in the armed position. It comprises contact rods (24) which are in contact with the ignition means (16) and are electrically short-circuited in the safety position by a short-circuit element (32). In the armed position, the contact rods (24) are in contact with contact elements (20) which are provided in the housing (12) remote from the short circuit element (32) or which can be connected. , or are connected, to the electronic ignition device (18).

Description

The invention relates to a safety device for a munition.

  safety device for an ammunition, in particular for a seeking head ammunition, comprising a housing in which a slide is mounted which can be moved between a

  security position and an armed position.

  A safety device of this type is necessary to maintain the ignition means in the safety position Usually, during the manufacture of the ammunition and at the end of its manufacture, a final electrical operating test is carried out If in the ammunition, c that is to say in the safety device of the ammunition, the ignition means is already in contact with the electronic ignition device, there is a considerable danger for the test environment of another side, when the ignition means is not in contact with the safety device of an ammunition, which eliminates the danger to the environment during the test, an appropriate electrically conductive connection must then be established between the means In addition, during the test of the ammunition after its manufacture, that is to say for example when one checks the ammunition or when one carries out a test without ammunition, its handling one without danger is possible only after having removed the means

  of the safety device.

  A safety device of the type mentioned

  in the preamble is known from the CA-PS i 267 565.

  In this known safety device, the ignition means is short-circuited in the safety position of the slide, and control of the electronic ignition device which comes into contact with the ignition means is not possible because of this short circuit. Document DE 39 34 573 Ai describes a switching device for detecting the final position of a displacement element constituted in particular by a safety release element, movable linearly or in rotation in a munition This switching device must allow the establishment of a defined contact when a stop is reached For this purpose, a cushion made of an elastic and electrically conductive plastic material is pressed by the displacement element against at least two contacts by which a circuit is formed for the current, from which the succession of functions of the munition can then be triggered. Document DE 37 09 741 C 2 discloses an excitation circuit of an ignition circuit for an electric ignition energy accumulator. This excitation circuit must be electrically protected to avoid defective ignitions which may be triggered when, in a long ignition control conductor, disturbing capacitive or inductive voltages are coupled between a logic ignition system with sensor and a discharge switching device of an ignition capacitor For this purpose, a signal is only triggered to release the discharge accumulator discharge circuit when within a door time from the establishment of an ignition signal can be summed a number determined pulses operating asynchronously, but appearing on a counter only when the presence of the ignition signal also coincides with the pulses of

output of a freewheeling oscillator.

  The object of the invention is to propose a safety device of the type mentioned in the preamble by means of which there is no danger for the environment of the test, with which it is not necessary to then make the appropriate connection. between the electronic ignition device and the ignition means, and by means of which an ammunition check or a test without ammunition can be easily carried out without having to move the means away

  corresponding ignition device.

  In a safety device according to the invention of the type mentioned in the preamble, this object is achieved in that the slide comprises contact rods which are in contact with the ignition means and which are electrically short-circuited in the

  safety position by means of a short-

  circuit, and which in the armed position are in contact with contact elements which are provided at a distance from the short-circuit element in the housing and which can be or are connected to the electronic ignition device. Because the slide comprises contact rods which are in contact with the ignition means, which are electrically short-circuited by means of a short-circuit element in the safety position and which are in contact in the position armed with contact elements which are provided in the housing at the front of the short-circuit element and which are, or may be, connected to the electronic ignition device, the safety device of the invention has the following features: advantages according to which, during the control of the ammunition or the electronic device

  there is no danger from a short-

  circuit of the ignition means, and it is not necessary to have to then establish an electrically conductive connection which represents a non-negligible measure between the electronic ignition device and the ignition means In addition it is possible to control safe ammunition equipped with the safety device according to the invention and to carry out tests without

appropriate ammunition.

  Other details, features and benefits

  will appear on reading the following description of

  embodiments of the security device according to the invention, the essential parts thereof being shown in the accompanying drawings in which: Figure i is a longitudinal and schematic sectional view of the security device, which is electrically connected conductive to an electronic ignition device represented by a block, FIG. 2 is a partially cutaway view of a second embodiment of the safety device, FIG. 3 is a partially cutout view similar to FIG. 2 of a third embodiment of the security device, FIG. 4 is a partially cut away view and similar to FIGS. 2 and 3 of a fourth embodiment of the security device, FIG. 5 is a partially cutout view of a fifth mode of the safety device, FIG. 6 is a partially cut away view of a sixth embodiment of the device Figure 7 is a partially cut away view similar to Figures 2 to 6 of a seventh embodiment of the security device, the slide being shown in the safety position in Figures 1 to 7 Figure 8 is a partially view cut from the safety device in the armed position, FIG. 9 is a partial view of the contact elements of the safety device seen in the direction of arrow IX in FIG. 8 in the original state, that is to say say before crossing of the contact elements by the contact rods of the slide, Figure 10 is a sectional view along line XX of Figure 9 in the original state of the contact elements, and Figure 11 is a view in section corresponding to FIG. 10 after crossing the contact elements,

  that is to say in the armed position of the slide.

  FIG. I is a sectional view of a safety device 10 for a munition, in particular a sighting ammunition, comprising a housing 12 in which a slide 14 is movably mounted between a safety position and an armed position In FIG. 1, the safety device or its slide 14 is shown in the safety position. The slide 14 comprises an ignition means 16 which is in electrically conductive connection in the armed position (see FIG. 8) with an electronic device d ignition 18 which is interconnected with the safety device 10 The electronic ignition device 18 is shown

by a block in figure 1.

  The housing 12 comprises contact elements which are described in more detail below with reference to Figures 8 to 11, which are electrically conductive connected by connecting conductors 22 with the electronic ignition device

18, as shown in Figure 1.

  The slide 14 comprises contact rods 24 which are mutually parallel and oriented in the direction of movement of the slide 14 The contact rods 24 are in contact with the ignition means 16

  via contact conductors 26.

  In the embodiment of the safety device 10 shown in FIG. 1, the boot 12 is formed on the side which is opposite the contact elements by through holes 28 through which the contact rods 24 extend by end sections 30 in the safety position of the

  device 10, and protrude from the housing 12.

  Said end sections 30 of the two contact pins 24 are electrically conductive, that is to say short-circuited, by means of a short-circuit element 32, which means that in the position of safety shown in Figure 1, the ignition means 16 is also short-circuited, and

  that there can be no danger.

  While in Figure 1 is shown a short circuit element 32 which is located outside the housing 12 of the safety device 10, Figure 2 shows a constitution of the safety device 10 according to which the short element -circuit 32 is located at

  inside the housing 12 of the safety device 10.

  The short-circuit element 32 is constituted in the embodiment shown in Figure 2 of the safety device 10 by a cushion 34 formed of a flexible plastic material and electrically conductive. Figure 3 shows a constitution of the safety device 10 according to which are formed in the housing 12 through holes 28 in which are fixed contact sockets 36 interconnected in an electrically conductive manner

  by means of a connecting wire 38, and are therefore short

  in the safety position of the safety device 10 shown in FIG. 3, the two contact rods 24 are inserted by their end sections 30 into said contact sockets 36, which means that the ignition means which is provided in the slide 14 is short-circuited by the connecting wire

38.

  FIG. 4 represents a constitution similar to that of FIG. 3 of the safety device 10 when it is in the safety position, the short-circuit element 32 however being constituted simply by a breakable wire which is in contact with the end sections 30 of the two contact rods 24, which extend through corresponding through holes 28 of the housing 12 of the safety device 10 With regard to the above-mentioned breakable wire 40, these are:

  example of a non-ferrous metal wire.

  FIG. 5 represents a safety device 10 in which the short-circuit element 32 is constituted by a rupturable sheet 42, which is fixed inside the housing 12 of the safety device 10 for example by a connection by bonding and which is in contact with the contact rods 24 or

their end sections 30.

  FIG. 6 shows a constitution of the safety device 10 in which the short-circuit element 32 is constituted by a reed relay 44 mounted on the slide 14 and connected in an electrically conductive manner with the contact rods 24 A magnet associated with the relay reed 44 is mounted in the housing 12 of the safety device 10 As regards this magnet, it is advantageously a permanent magnet In the safety position shown in FIG. 6, the reed relay 44 is closed by the field magnetic from magnet 46 If the safety device 10 is moved from the outside to the armed position, this results, due to the distance which has increased between magnet 46 and reed relay 44, a corresponding reduction of the magnetic field which acts on the reed relay 44, so that this reed relay 44 opens and that the short-circuit of the means

  ignition 16 in the slide 14 is eliminated.

  FIG. 7 shows a constitution of the safety device 10 in which the short-circuit element 32 is constituted by a self-conducting field effect transistor 48, which is provided on the slide 14 The field effect transistor 48 is connected by its corresponding connection blades with the contact rods 24 The control electrode of the field effect transistor 48 is connected to the housing 12 of the safety device 10 or protrudes

outside of it.

  Figure 8 is a partial sectional view of a safety device 10 in the armed position in which the contact rods 24 are remote from the corresponding short-circuit element 32, which

  the ignition means are no longer short-circuited.

  In the armed position, the contact rods 24 are in electrically conductive contact through their two end sections 52 with the contact elements 20 which are connected by means of connecting conductors 22 to an electronic ignition device 18 which does not is not shown in this figure The contact elements 20 are mounted in a contact device 54 which is fixed on the housing 12 of the safety device 10 The contact device 54 is partially represented by the front in FIG. 9 It comprises a electrically insulating support 56, constituted for example by a sheet of insulating material As can be seen in FIGS. 10 and 11, the electrically insulating support 56 comprises through holes 58 which are in alignment with the holes 60 of the housing 12 (see FIG. 8 ) The electrically insulating support 56 is provided with conductive tracks 62 which extend around the through holes 58 by appropriate surface sections 6 4 Said surface sections 64 are respectively covered by a sheet 66 of an electrically conductive material, which is in electrically conductive contact with the associated surface section 64 and which can be traversed by the associated contact rod 24 or by its second section d end 52 in the armed position, as shown in

Figure 11.

  As regards the conductive paths 62, they may for example be copper conductive paths, and as regards the sheets 66 in contact with the conductive paths 62, copper-beryllium sheets so that the leaves 66 can be crossed reliably, these can be provided with setpoint breaking lines 68 (see FIG. 9)

Claims (15)

  1 safety device for a munition, in particular for a search head 3 ammunition, comprising a housing (12) in which is mounted a slide (14) which can be moved between a safety position and an armed position, and which is provided with 'an ignition means (16) which is in contact with an electronic ignition device (18) in the armed position, characterized in that the slide (14) comprises contact rods (24) which are in contact with the ignition means (16) and which are electrically short-circuited in the safety position by means of a short-circuit element (32), and which in the armed position are in contact with contact elements (20 ) which are provided at a distance from the short-circuit element (32) in the case (12) and which can be or are connected to the device ignition electronics (18).   2 Device according to claim 1, characterized in that the contact rods (24) are oriented at least approximately parallel to each other and relative to the direction of movement of the slide (14).   3 Device according to claim 1 or 2, characterized in that each contact rod (24) comprises an end (30) which is turned towards the short-circuit element (32) and a second end section (52) which projects from a second front surface of the slide (14) which faces the associated contact element (20) intended for the device ignition electronics (18).   4 Device according to one of claims   previous, characterized in that the first end section (30) of each contact rod (24) protrudes from the front surface of the slide (14)   which is turned towards the short-circuit element (32).   Device according to one of the claims   previous, characterized in that the short-   circuit (32) consists of a cushion (34) made of a flexible and electrically conductive plastic.   6 Device according to one of claims   1 to 4, characterized in that the short-circuit element (32) comprises sockets (36) associated with the contact rods (24), which are arranged in the housing (12) of the device (10) and which are connected to each other   electrically conductive.   7 Device according to one of claims   1 to 4, characterized in that the short circuit element (32) is formed by a wire (40) which can be broken and which is fixed to the end sections   corresponding (30) contact rods (24).   8 Device according to one of claims   1 to 4, characterized in that the short circuit element (32) consists of a rupturable sheet (42) which is fixed to the end sections   corresponding (30) contact rods (24).   9 Device according to one of claims   1 to 4, characterized in that the short-circuit element (32) is formed by a reed relay (44) provided on the slide (14) and connected to the corresponding contact rods (24), and the housing (12 ) has a   magnet (46) associated with the reed relay (44).   10 Device according to one of claims   1 to 4, characterized in that the short-circuit element (32) consists of a self-conducting field effect transistor (48) mounted on the slide (14) to which the corresponding contact rods (24) are connected ), the control electrode (50) of the field effect transistor (48) being connected to the housing (12) of the device (10).   11 Device according to claim 1, characterized in that the contact elements (20) are formed in the form of conductive sheet sections (66) of an electrically conductive material and can be traversed by the contact rods (24), rods which are brought into contact with conductive tracks (62) and which are provided with these sheet sections on an electrically support insulator (56).