US2054510A - Percussion fuse for projectiles, bombs and the like - Google Patents

Description

sept. 1s, 1936.

l.. E. REMoNDY 2,054,510

PERCUSSION FUSE y:FOR PROJECTILES, BOMBS AND THE LIKE Filed Sept. 27, 1934 Sheets-Sheet 1 ffllllmf V @f v A Sept. 1.5, 1936. l.. E. REMONDY PERCUSSION FUSE FOR PROJECTILES, BOMBS AND THE LIKE Filed Sept. 27, 1954 2 Sheets-Sheet 2 1 Lf c. T

Patented Sept. 15, 1936 UNITED STATES PATENT OFFICE PERCU S SION FUSE FOR PROJECTILES, BQBIBS AND THE LIKE Lon Emile Rmondy, Paris, France 13 Claims.

It is known that percussion fuses, whether intended for projectiles which are to be shot from a gun or for bombs carried by an aircraft, have to satisfy a multiplicity of conditions which it has been practically impossible to reconcile with each other heretofore.- Thus, fuses intended for projectiles to be shot from a gun are required to possess extreme sensitivity, that is to say, the possibility of operation even on encountering an obstacle of very slight resistance, such as an aircraft fabric for example. At the same time, it is required thatl such fuses shall not allow of untimely firing in the case of an accidental fall during handling, even if the projectile falls from a relatively considerable height on to a body of considerable resistance (paved roads, rails of railway tracks and so forth). If a modern fuse, which satisfies these conditions, is to be employed for a bomb to be dropped from an aircraft, it is required that operation shall be impossible in the case of the premature fall of the bomb or of the aircraft itself from a height which may attain 40 or 50 metres, while on the other hand it is necessary that the fuse should operate on encountering even an obstacle of very slight resistance (humus, marshy ground, and so forth) when the height of fall is still of a relatively small value, as on the order of 150 to 200 metres. Finally, the fuse employed with a projectile to be fired from a gun should be so constructed that it cannot operate in any circumstances except after it has left the gun.

The present invention relates to an extremely simple and inexpensive percusssion fuse which satises the desiderata enumerated in the foregoing.

Whereas, in the known percussion fuses, the operation of the firing mechanism is absolutely entirely the result either of the driving in of the front member of the mechanism or of the inertia of the rear member, or simultaneously of both these phenomena, the new fuse is constructed on an entirely new principle which consists in utilizing the relative inertias of the elements of the front member of the firing mechanism, which inertias come into operation after the obstacle is encountered, the said front member being constructed or designed in such a manner as to be able to dissociate under the effect of the said different inertias of its elements. The liberated rear element, the velocity of which is considerably reduced or is practically destroyed, is thus encountered by the rear member of the mechanisrn which continues its travel with the projectile, the shock, however, being capable of producing ignition only if the velocity of the projectile is suiciently high.

The dissociable front element of the ring mechanism may be given various forms of construction.

Diferent constructional embodiments of the invention to be described hereinafter are shown in the accompanying drawings wherein:

Figures 1 and 2 of the drawings show in sectional elevation the front part of a fuse body of any known type provided with a mechanism according to the invention, before and after the operation of the mechanism, respectively.

Figure 3 shows in part sectional elevation the front portion of a fuse body provided with another form of construction of the invention.

Figures 4 and 5 are sectional elevations of still another embodiment of the invention, Figure 5 showing the position which the striker may assume in case of a premature driving in thereof.

Figure 6 is a sectional elevation of a further modification of the invention.

Figure '7 shows a modification of the device illustrated in Figure 6.

Figure 8 is a partially sectional elevation illus` tratng the application of the invention to a fuse in which the intermediate firing percussion cap is omitted.

Figure 9 is a sectional elevation of another form of the invention in which the dissociable member of the fuse mechanism is the percussion cap carrier.

Figure 10 is a plan view of the retaining washer of the mechanism of Figure 9.

Figure 11 is a sectional elevation of still another form of the invention illustrating its application to a bomb.

Figure 12 is a similar View illustrating the application of a centrifugally actuated safety device to one form of the present invention.

In the embodiment shown in Figures 1 and 2, a denotes a fuse body of known construction in which are mounted a rear firing member, preferably the percussion cap b, which in this particular case is fixed in its lodgment, and a front member, preferably the striker, the whole of which is denoted by c. In this case, the said striker is constituted in the manner known per se simply by a stem carrying the rearwardly extending percussion needle point c1 and having on its forward end an enlarged head c2 the latter being disposed and held at a suitable distance e from a supporting shoulder a1 provided on the fuse body a, the retention in this position being normally assured, likewise in known manner, for example by a frangible or shearable pin d.

According to the invention, the striker thus held at the distance e is so designed that the masses forwardly, rearwardly and in the region of the retaining member d are so chosen that, under the effect of itsV inertia, all the part of the striker situated A,practically `below .the horizontal (as viewed'in Figure l) axial planeof; the pin becomes detached from the front part carrying the head c2 after the latter, under the action of the obstacle encountered, comes to bear on the shoulder a1, this result being possible, however, v.onlyiifthe projectile possesses a suitable velocity at the ymoment of impact and if it can retain-.a veryconsiderable proportion of such velocity after encountering the obstacle. Y Y

The operation of the fuse descrbedlandishown Vin Figures 1 and 2 may furthermore beexplain-ed as follows: Y LAssumingnthat 'the projectilezisfmoving at a fairly high velocity, which 4it ica'n onlylattain if 100; to 150 metres, and that at this veloci-tythe projectileencounters,y yan-fcbstaclej of slight resistithelstrikerfand m-ayy consequentlybe selectedsuf- Y if'lcientlyeweak.v VjNlhen the fs'triker in its relative vinwardmovement-isfarrested on'the vshoulder a1,

v'it will be''immdi-ately driven forward by `the prcjectile'whi'ch', due to-thelcwresis'tance of the --'obstacle, yis capable-of advancingLatl a still 'considerable velocity, This'fabilityof i the projectile `"to advance may fbe -assis'ted moreover by 1 a relatively; taperedf'form of -the fron-'t part -o'f the ogive extremely'sudden dfrivingfby the projectile, which the shoulder a1,the rear and `-front elementsof ifthe striker offer different'fresistances, by reason of their -suitabiy chosen d'iierentrnasses, which 1 tn'ds 5to causeaa fdissocia'tion, this lbeing furthermore ensured by weakening sufficientlyfthe zone 1ofiseparationbetween'therear. element carrying fthe-n'eedlelpoint' c1-and? tlrefront 'element carrying This weakening lmaybernerely due to the holeprovided for the passage ycf-th'epin d;

ed still further by weakening EtheY cross-'section 4"in theI zone o'f `*the "pinLifor 'examplefby turning,

As above pointed out, the'fs'h'ock ofthefshoulder "Sal against Ithe'indeformablehea'd c25 followed inprojectile, brings-they? inertia "ofi thernee'dle .point carrying crear 'element :el of the :striker` fviolently zintegplay;andycausesfthe dissociation: between the rear ,ele-ment' carryingfltheneedle .pci-nt cl and the frontfelementcarryng the 'head-c2. .Of course,

the Vc l-istanc-e` abetween the head-c2` and the -shoulldergalfis ess than the.distance f separating the extremitysof the.- needle point Lc1 .from the percuSsiOncapb, so that even in the case of untimelyrnpturebfthegpind, .the-needle point of fthe .striker-cannot meet the percussion cap, it -being impossibleJfor sucli'meeting tctakejplace Q u iiless'the elements of 'the'strikerare dissociated.

"Figure" shows the *percussion Acap 'impaled on the, striker after the separation or vdissociation theftwoi'elements'of'the'iatter.

Of course, the suitable distribution of the masses in the striker as a whole may be obtained in various ways. Thus, it is possible to provide a recess in the portion carrying the head.

In the construction illustrated in Figure 3, instead of the, striker being constituted by a single body, the masses of which are suitably distributed rWith a View to dissociationA into two elements situated respectively above and below the region of the retaining member, the said striker is constituted by two distinct elements normally secured together but separable upon impact. The front :element carrying the head c2 is in this case xed to thelfuse body a by the pin d which also serves to retain the whole of the striker in inoperative position, while the rear element c1 which carries the needlepoint istted in a cavity of the stem c f and is normally secured to the said stem by a frangi-ble or shearable member such as the pin g, any forward displacement of cl relatively to c2 being prevented for example by a supporting col- Alar c3iformed Ion the element c1. As in the pre- .cedinglexample, a distance e,`less than the distancef separating the percussion cap b from the point .of the striker, is left between the head c2 zand a shoulder a1 of :the fuse body.

. 'LThe operation of the fuse according to Figure 3;isfquite similarto that of the fuse shown in Figures ..1 and .32. On encountering an obstacle of slight resistance, such as an aircraft fabric or Vsoft ground for example,the pin d issheared by Ythe driving in of the indeformable head c2 and the latter'moved rearwardly until it strikes the shoulder a1 of the fuse body with a sudden shock, re-

Y sulting inthe shearing of the' pin y. Immediately after this shock, 'the whole of'the striker thus Pli'bera'ted'from lthe-fuseA body is driven by the projectile which, due to the relatively slight resistance of the obstacle, may continue its travel. The inertia of the needle-point-carrying rearelement c1 of the strikertheny comes into play, the said element tending to lag-behind and thereby causing the=dissociation between the rear element and 'theLfront-element and fthe operation of the fuse dueto the meeting of the percussion cap b and 'the needle-point-carrying element c1 separated l Yfrom the head-carrying element c2.

In the embodiment which has just been deiscribed, it-is possible, in order to increase the mass of the l:needle-point-carrying rear element of the striker without increasing its bulk, to extend the said element forwardly until it contacts the V"head c2, a slit being left for the passage of the pin d, as shown in dot-and-dash lines in Figure 3.Y

Figure 4 shows a Variation of the constructional form of Figure 3, in which the two distinct ele- .ments, needle point carrier c1 and'head carrier c2 are assembled together bythe same frangible or shearable member d which normally retains the "whole of the striker fixed with respect to the fuse body a.

Figure 4 also shows a particular arrangement v of the rear=member of the ring mechanism, the

' said arrangement being equally applicable to all the forms of construction of the invention. In

order to prevent any meeting between the needle point of the striker and the percussion cap in the case of the Ypremature rupture of the retainjing member of the striker or of the member assembling together the elements of the said striker, while the projectile is travelling through the gun barrel, the percussion cap carrier, as shown in Figure 4, is disposed in a recess a2 of the fuse body where,"instead ofbeing fixed, the said percussion cap carrier is yieldngly urged against the front part of the said recess by means of a resilient member h, such as a spring, a cylinder of' felt or cork, and so forth. It will be appreciated that, on the initial movement of the projectile at the moment of firing and during its acceleration, the percussion cap carrier is held back by its inertia which is suflicient to compress the resilient support h. Once the acceleration has ceased, the said support resumes its preponderance and fixes the percussion cap carrier in the position indicated in Fig. 4.

Figure 5 shows the percussion cap carrier of Figure 4 driven towards the bottom of its recess and the support h compressed. The figure shows the position which the striker may assume in the case of premature rupture of the pin d.

"In the construction shown in Figure G-,Hwh-ioh may be considered as a modification of the device shown in Figure 3, the striker is constituted by two elements: a head-carrying front element c2 and a needle-point-carrying rear element c1, connected together by means of a shearable assembling pin y, the whole of the two elements being normally secured to the fuse body a by the usual pin d. In this construction, however, the rear element c1 is not prevented from moving forward. On the contrary, the dissociation between the said elements c1 and c2 is brought about upon impact, under the effect of the inertia of the element c1 which moves forward, shearing the pin y. Once the elements c1 and c2 are dissociated, operation take place as in the preceding examples.

In thermodification illustrated in Figure 7, the dissociable striker comprises a head-carrying element cZ and a needle point-carrying element c1 connected together by means of the shearable retaining pin d, which passes through the element c1 and at the same time through the tail-piece i1 of a plunger i, the head of which bears by means of a shoulder against the base of the head-carrying element c2. A clearance j is left between the said head z' and the front end of the hollow stem of the element c2.

Upon impact, the plunger i moves forward relatively to the striker assembly, shearing the pin `d and thereby effecting the dissociation of the elements c1 and c2.

In all the forms of construction which have just been described, it has been specified that the distance e between the head c2 of the dissociable striker and the shoulder a1 of the fuse body was necessarily less than the distance f separating the needle point c1 from'the percussion cap b. It should be noted that the said distance f may be made large enough to delay in a suitable manner the meeting of the striker and the percussion cap. It is thus possible to delay the operation without employing a delay-action composition, solely on account of the interval left between the two elements of the mechanism.

` As shown in part Sectional elevation in Figure 8, it is also possible to employ the dissociable striker according to the invention by simply combining it with the detonating percussion cap k, the usual intermediate firing percussion cap b being rin this case omitted.

needle point or any other suitable shock member.

Figure 9 shows in sectional elevation such a constructional example. In this construction the front head carrier c2 is made in the form of a socket in the interior of which is disposed a percussion cap c1 constituting the rear element of the dissociable unit member c2--c1. The unit c2-p-c1 may be normally retained in a fixed position with respect to the fuse body a, for example, by means of a washer d having projecting pieces, such as that shown in Figure 10, which is pierced by a central hole d1 and is fixed securely in the fusebody by the projecting pieces d2. Of course, the masses c1 and c2 will be suitably chosen to ensure operation in the same manner as in the constructional examples described hereinbefore. On impact, the washer is sheared from its projecting pieces d2 and the two elements c1 and c2 are forced rearwardly together until the head c2 strikes shoulder a1 and is suddenly arrestedin its rearward movement. 'I'he inertia of c1 during the continuation of the movement of the projectile will delay the forward movement of the percussion cap which will thereupon be struck by the fixed striker b which continues its movement with the projectile.

Figure 11 shows in sectional elevation an exretained on the fuse body, for example, by means of a stud m1 engaged in a slot a3. The cap, likewise in known manner and as shown in Figure 11, may be retained in the position of this gure by a collar 11, adapted to be withdrawn upon the bomb being dropped, and which if desired may constitute one of the suspension members of the bomb.

Figure 12 shows in sectional elevation the use of the device of a dissociable front member similar to that shown in Figure 4 in combination with a safety device o, adapted to be withdrawn under the effect of the centrifugal force, of any known type and disposed at a suitable point, for example at the rear of the dissociable member c'L-c1 of the mechanism. In this example, the safety device is constituted by a spring bolt, the nose of which remains in the path oi the member c2-c1 as long as the effects of the centrifugal force have not made themselves felt suiciently to ensure the complete withdrawal of the said nose.

A projectile provided with any one of the forms of construction which have just been described is, as indicated in the foregoing, ensured against any premature operation during its travel in the interior of the gun barrel. It has been shown in the foregoing that the mechanism of the fuse operates, upon encountering an obstacle, so long as the nature of the obstacle is such that the projectile may continue its movement with a suffcient velocity during a suitable time for effecting the dissociation between the elements of the dissociable front member.

It obviously results from this fact that, if the velocity of the projectile is insufficient, the dissociation between the elements c1 and c2 is impossible; and it follows that a projectile, even if it strikes a very resistant obstacle, cannot burst on account of the operation of the iiring mechanism, the dissociation of the elements of the dissociable front member not being effected and the rupture of the pin or other retaining member of Athe projectile 'does not hit the objective, -i-t vmay fall without the mechanism of the fuse operating, whenever suchfall takes place on hard ground or any other resistant obstacle (such as pavings, roads, buildings, and so forth).

If it is desired to ensure the operation of the fuse ,on encountering a resistant obstacle, it is possible, as shown in Figure 12, to provide the front element czof the dissociable member cZ-c1 with a projection p which extends forwardly beyondelement c2 a distance greater than the dis- Y'tance e between the rear surface of said element and the shoulder a1 of the fuse body. Upon initial encounter of the end of projection p with a resistant'obstacle, the'dissociable member c2-c1 is driven rearwardly as a unit so as to rupture the'retainingv member d and until engagement between head c2 and shoulder a1, atrwhich time a portion of projection p will still extend beyond the end of fuse Vbody a. This remaining portion will then be crushed as the projectile continues to move until the end of the fuse body also comes into contact with the obstacle. During the crushing of the projection p, the projectile will travel` through a suitable distance with an ap-V preciable residual velocity, which is sufficient to ensure the operation of the mechanism by the dissociation of the two element c2 and c1.

, Although a number of Vdiiferent forms of the invention have. been described and illustrated in Y theV accompanying drawings, it will be obvious lof the invention.

What is claimed is:-

1. In a percussion fuse mechanism, the cornbination with a fuse -body of a rear fuse member xedwith respect to said body, a front fuse member comprising at least two separable elements normally united together, means normally securing all of the elements of said frontmember 4in fixed positions relative to the fuse body but rupturable upon impact so as to permit said elements to movefrearwardly with respect to said body, means for Ylimiting the extent of rearward movement of the frontmost element of said front member, and means normally uniting said elements 'but rupturable after impact Vso as to separate the rearmost element from the frontmost element, the mass of said rearmost element being such'that Yafter separation ,from the frontmost element and engagementof the latter with said limiting means, and during continued forward movement of the fuse body, the inertia of said rearmost element is sufcient to bring it vinto Apercussion contact with `therear member of Athe fuse mechanism.

V`2. AV fuse mechanism according to claim 1 wherein the rear fuse member is disposed at ysuch a VdistanceV from the front member Vthat VVpercussion contact between the rearmost element of the front member and the rear member is delayed for aV suitable length of time after dissociation :ofthe front'member into its separate elements,

V'whereby the use of a delay-action composition only astor forward movement relative to the fuse body, Saidmechanism -including a resilient support interposed between said rear fuse member and a fixed portion of the fuse body to the rear -thereof whereby, when said fuse mechanism is used with .a projectile, theV rear fuse member is set back into a-n inoperative position when the projectile is fired from the gun.

4. ,A fuse mechanism' according to claim 1 including means for positively preventing rearward movement of the :front fuse member, when the fuse mechanism is used with a projectile, until after the projectile is in night, said means being then withdrawn :into inoperative position under the influence of centrifugal force.

5. In a percussionV fuse mechanism, the combination with a fuse -body of a rear Yfuse member comprising a'percussion capxed with respect to said body, a front fuse member having a Ybody portion slidably mounted in the fuse body and a percussion cap striker on the rear end thereof, means normally securing said front member to said fuse body Vbut rupturable upon impact so as -to permit said member to move rearwardly with respect to said body, and means for limiting the extent of `said rearward movement of said front member, the body portion of said front member being weakened at lone point in its length and the masses of said member forward and rearward of said weakened point being such that, upon engagement of said member with said limiting means, the rear striker-carrying portion thereof is detached from the front portion under the effect of its inertia and, during continued forward travel of the fuse body, is brought into firing contact with the percussion cap.

6. In a percussion fuse mechanism, the combination with a fuse body of a rear fuse member comprising a percussion cap xed with respect t0 said body, a front fuse Vmember having a body portion slidably mounted in the fuse body, an enlarged head on theV forward end thereof .and a percussion cap striker on the rear end thereof, a

frangible pin passing through said body portion and anchored at its ends in said fuse body, said pin normally securing said front member to said fuse body but rupturable upon impact so as to permit said member to move rearwardly with respect to said fuse body, and a shoulder fixed with respect to said fuse vbody for limiting the extent 0f rearward movement of said head-carrying portion of rsaid front member by engagement therewith, the body portion of said front member being weakened in the region of said pin and the masses of said member forward and rearward of said weakened point being such that, upon engagement of said head with said shoulder, the rear striker-carrying portion of said member is detached from the head-carrying portion under the effect of its inertia and, during continued forward travel of the fuse body, is brought into firing contact with the percussion cap.

7. In a percussion fuse mechanism, the combination with a fuse body of a percussion cap fixedly mounted in said body, a striker member slidably mounted in said fuse body forward of said percussion cap, said striker member including a front element adapted to receive the impact ,and a rear element carrying a striker point, means normally securing said striker member to said Yfuse body but rupturable upon impact so as to permit said member to move rearwardly with respect to said fuse body, means normally securing said front and rear elements of said member together but rupturable upon rearward movement of said front element, and means for limiting the extent of rearward movement of said front element, the mass of said rear element being such that after rupture of said last mentioned securing means and engagement of said front element with said limiting means, and during continued forward travel of the fuse body, the inertia of said rear element is suicient to bring its striker point'into firing contact with said percussion cap.

8,111 a percussion fuse mechanism, the combination with a fuse body of a rear fuse member fixed with respect to said body, a front fuse member comprising a front element and a rear element, said front element carrying an enlarged head extending beyond the fuse body and adapted `to receive the impact, a shearable member normally securing said front element to said fuse body but rupturable upon impact so as to permit rearward movement of said element relative to said fuse body, a second shearable member normally securing said rear element to said front element, and a shoulder formed on said fuse body for limiting the extent of rearward movement of' said front element by engagement with said head, the mass of said rear element being such that after impact and upon engagement of said shoulder with said head said second shearable member is ruptured so as to separate the rear element from said front element, continued forward travel of the fuse body then bringing the rear element into percussion Contact with the rear member of theV fuse mechanism.

9. In a percussion fuse mechanism, the combination with .a fuse body of a percussion cap fixedly mounted in said body, a striker member slidably mounted in said fuse body forward of said percussion cap, said striker member including a front element carrying an enlarged head extending-beyond the fuse body and adapted to receive the impact and a rear element carrying a striker point, a shearable member normally securing said front element to said fuse body but rupturable upon impact so as to permit said element to move rearwardly with respect to said fuse body, a second shearable member normally securing said rear element to said front element, means for preventing forward movement of said rear element relatively to said front element, and a shoulder carried by said fuse body for limiting the extent of rearward movement of said front element by engagement with said head, the mass of said rear element being such that upon engagement of said head with said shoulder the inertia of said element ruptures said second shearable means so as to disconnect said elements from one another and, during continued forward travel of the fuse body, brings its striker point into ring contact with said percussion cap.

10. In a percussion fuse mechanism, the combination with a fuse body of a percussion cap fixed with respect to said body, a striker member comprising a front element and a rear element slidably mounted in said fuse body forward of. said percussion cap, said front element carrying an enlarged head extending beyond the fuse body and adapted to receive the impact, said rear element being mounted within said front element for movement rearwardly but not forwardly relative thereto and carrying a striker point, a shearable pin normally securing said front element to said fuse body but rupturable upon impact so as to permit rearward movement of said element relative to said fuse body, a second shearable pin normally securing said rear element to said front element, and a shoulder formed on said fuse body for limiting the extent yof rearward movement of said front element by engagement with said head, the mass of said rear element being such that after impact and upon engagement of said shoulder with said head said second shearable pin is ruptured so as to separate the rear element from said front element, continued forward travel of the fuse body then bringing the striker point of said rear element into firing contact with the percussion cap.

il. In a percussion fuse mechanism, the combination with a fuse body of a percussion cap fixedly mounted in said body, a striker member slidably mounted in said fuse body forward of said percussion cap, said striker member including a front element carrying an enlarged head extending beyond the fuse body and adapted to receive the impact and a rear element carrying a strikerpoint, a shearable pin passing through both said front and rear .elements and anchored at its ends in said fuse body, said pin normally securing said elements together and to said fuse body, the connection between said elements and the fuse body being rupturable upon impact so as to permit said elements to move rearwardly with respect to said fuse body, means for preventing forward movement of said rear element relatively to said front element, and a shoulder carried by said fuse body for limiting the extent of rearward movement of. said front element by engagement with said head, the mass of said rear element being such that upon engagement of said head with said shoulder the inertia of said element ruptures the connection between said elements so as to disconnect them one from the other and, during continued forward travel of the fuse body, brings its striker point into firing contact with said percussion cap.

12. In a percussion fuse mechanism, the combination with a fuse body of a rear fuse member fixed with respect to said body, a front fuse member comprising a front and a rear element normally united together, said front element having an enlarged head thereon, means normally securing said front member to the fuse body but rupturable upon impact so as to permit said member to move rearwardly with respect to said fuse body, a shoulder carried by said fuse body for limiting the extent of rearward movement of the front element o-f said front member by engagement with said head, a crushable impact receiving member projecting forwardly from said enlarged head and extending beyond the end of said fuse body a distance greater than the normal distance between said head and said shoulder, and means normally securing said front and rear elements together but rupturable after impact so as to separate the same, the mass of said rear element being such that after separation from said front element and engagement of said head with said shoulder, and during continued forward travel of the fuse body until said impact receiving member is crushed to the level of the front end of the fuse body, the inertia of said rear element is suicient to bring it into percussion contact with the rear member of the fuse mechanism.

13. In a percussion fuse mechanism for a projectile or the like, the combination with a fuse body of a fixed rear fuse member, a front fuse member comprising a plurality of separable elements normally securely connected to 4one another, a retaining member normally rendering said front fuse member immovable relatively to "the-tine; body; Vsaid retainineY member beinesoVV t (lied, ,and arranged vthat upon; impact angobstaele of insumcient resistanceV to 'alfrest'thg glfli?l of the projectile the connection between said front fuse member and the fuse body inqkerinralld said fuseV member moves rearwardly relatively to the fuse body under the force oi impact, and means for limiting the rearward,

movement o f one of the elements of said front 10i fils@ moembei.' at, least one otherA of said elements being unlimited in its movementby said last named. means;Y the normali connection between Said; elements; of; the front fuse j member being such that` afterimpaet and upon engagement. of;

one of said element-s,V withv the. limiting means Saidy connection is ruptureddue tothe inertial of thejurllmiiled element and the latter is free to mQverearwardIy into; percussion contanti. with. the rearfuse; member during continued forward travel of. theiproiectile.:

LEONl REMONDY.

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