US2503519A - Fuse - Google Patents

Description

April l1, v1950 u R, s, SPERRY 2,503,519 v I FUSE Filed May '7, 1945 Y 2 18 "3 I l2' :11 rl fI-lv 6 79] 23 l y 55 l I7 4:3 42 J6 ,Q51 51' :a 422 55 2 1+ 15- 4 f4 4 2 1 18 59 2.1 I 19 f1 g] f 4 4l lull 3o 2,3 45 m 39 i913- 35 12 @46 Y ze lzj d 13 7 1a Ilm 25 INVENTOR Royer pervy. aamdzgwew ATTO R N EY' Patented Apr. 11, 1950 UNITED STATES ATEN T OFFICE Y FUSE 'Roger S. Sperry, Waterbury, Conn., assigner lto Scovill IManufacturing Company, Waterbury, Conn., acorporation of Connecticut Applicationv May?, 19475, Serial No. 592,367

17 Claims 1 This invention `relatesI "to fuses for shells or projectiles. More particularly, the invention relates to a safety device incorporated in standard types of fuses, particularly ofthe ldelayed action type to lautomatically che-ckthe operation vof the delay action Vmechanism of the fuse', as well as'toat times prevent any action `ot the fuse to ignite or explode the projectilein the event that the projectile ydevelops aA wobble for yaw :due to ex-f cessive wear or inaccuracies/of any type or kind' in the gun barrel from which the projectile is` discharged. The novel features of the invention will be best understood from the following de-l scriptions when taken together with the accompanying` drawing, in lwhich ycertain `embodiments ofthe invention are disclosed and in which the separate parts rare designated by Asuitable reference charactersl in each of the views; and' in which:

Fig. 1 is a longitudinal sectional view through a iuse diagrammatically illustrating the general arrangement ofthe fusestructure and' indicating thedelay action mechanism in elevation.

Fig. 2is an enlargedfsectional View 'through the delay action mechanismpftherfuse shown'in Fig. 1 and taken at right angles to the illustration in Fie'. l.

Fig. 3 is la se'ctionvon'the line 3'3 of Fig.`2.

Fig. 4 lis a cross section `onthe line 4-4 of Fig. 2 with spring omitted.

Fig. 5 is a View simi-1er tonie. 2, yshowing the" parts in a different position and illustrating the" impact ofV the Vfuse vwith van object' orA upon any4 sudden checking of the forward progress of a projectile, it has -been experienced, that when shells or projectiles having these fuses lare shot from worn or faulty guns, the shell orprojectile develops a wobble or 'yaw` causing the 'automatically movablefmeans of the delay action-mechacheck and lock the delayed action mechanism from functioning `if `an appreciable wolololey or yaw prevails in 'the shell or projectile, so as to positively prevent -'ring ofthe shell through the agency of the delay'action mechanism. Under such conditions, when a gun is known to cause wobble or yaw of projectiles red therefrom, the fuse-may, nevertheless'be adjusted to detonate the shell, on impact, through the usual detonator employed in the tip of the fuse.

`In order to illustrate one adaptation of the invention, I havey shown in Fig. 1 of the drawing a more cor -less standard delay action fuse I0, cornprising a tip body portion I I and an enlarged inner body portion I2 externally threaded, as seen at I3, for attachment to a shell or projectile. The bodies II and I2 are joinedby a center coupling tube I4 andby a conical casing I5 seating in the walls 'of the bodies I-I and I2, in the manner clearly shown. Supported in the outer end portion of the tip body II is an inwardly directed firing pin I6 adapted to strike a detonator 'I'I supported in the body I'I upon impact of the shell or projectile.

'Ihe body I2 has apassage I8 in alinement with the bore-of the tube I4, and extending into the passage I8 is a pin t9 blocking the passage I8 to prevent the fuse from igniting or exploding the shell upon operation of the detonator I1. The

' pin I9 forms part of a rotary adjustable control device 20 exposed through the body I 2 and having a key or screw driver slot 2l at its outer surface. In the position ofthe slot shown in Fig. 1, the device 20 is set for delay action of the fuse. However, by rotating the device 2D to arrange the slot at right angles to the position shown,

` the device will be released to allow the pin I9 to nism to be set in motionto explode the projectile"-l prcmaturely. This premature explosion of the. shell or projectile can take pla-ce at any point' between the Agun firing the projectile and the objective, and thus 'has been found' to 'be ex-"i tremely objectionable Aand detrimental.

In order to correct and obviate 4this defect and control-device automatic in operatiom'whicli will move outwardly against the action of the spring 22 by centrifugal force. opening the passage I8 allowing the shellto instantaneously explode upon impact with an objective.

At 23 is shown in elevation 'in Fig. 1 of the drawing the delay action mechanism ofthe fuse which is'he'ld inl place in the bodyA I2 by a sleeveV type nut 24. The mechanism 23 comprises a cup shaped casing 25, the closed end portion of which includes a center tube 26 in alinement with the passage I 8, land extending into the casing 25 to v the degree substantially-illustrated in vFigs'. 2, 3 and 5 ofthe drawing.

ing. Two plunger type check devices 29 arev oppositely seated in opposed boresl inthe member 21. Springs 30 vnormally urge each device radially yinwardly against inner stops 3l. These stops are in alinement with Vthe inner end of the center 'tube "28 of the casing 25. It will -on .the element at the surface lv thereof.

The pin 32 is supported in the closed end of the casing at one side of the tube 26, whereas the detonator 33 is supported in a bore 34 of the member 21, as clearly seen in Fig. 3.

Pivotally supported, as seen at 35 in the member 21 is a yoke-shaped blocking member 36, the side arms 31 of which are adapted to swing into position between the plunger devices 29 to hold them in radially outward position, as

seen in Fig.` 5of thedrawing, when the devices 29 are forced outwardly by centrifugal force. A The cross head 38 of the-blocking member 36 forms a weighted end on- Vthis member, which causes the arms 31 to swing inwardly into the operative Aposition shown in-Fig. 5 by centrifugal force. The member 36 is free-toI swing in a recess portion 39 formed in the member 21, as illustrated in Fig. 4 of the drawing. The member 21 includes a sleeve extension 40 which is recessed at opposite sides, as seen at 4|, Figures 4 and 7, and in these recesses inturned-key members 42 on the casing 25 retain the member 2.1 vagainst rotation inthe casing 25. v l

A spring 43 seats on the end wall of the cup shaped casing and, in the standard fusel detonator mechanisms 23, this spring seats upon the surface 44 of the member 21 to urge the same. into safe position. In the normal use of the fuse, when the projectile strikes an object or its forward advance is retarded,.the weighted member 21 will move forwardly or in the direction of the body Il against the action of the spring 43 to bring the ring pin -32 in engagement with the detonator 33.

,The above described construction deals with a more or less standard type of delayed action fuse as used by the armed forces.

Incorporating my. improved. automatic safety device in fuses of the kind under consideration, the following more specifically` described alterations and changes in the standard fuse are madeand the parts now described -are added.

.In the first place, the weighted end portion of the member 21 inl a position at right angles to the recess 39 is provided with a recess 45 terminating in bevelled end.walls 45, clearly.

ing. The element 41 may -be generallyl described.

as an O shaped element comprising similar weighted ends 48 joined by.narrow side walls 49.

which form a large elongated opening 50 within the element. The end walls of the opening 50 are preferably contracted in the direction of the upper or outer surface 5l of theelement in order to form relatively .sharp pawl like edges 52 The ends of the elementv 41 have bevelled walls 53 whichA extend onto downwardly directed extensions 54 centrallyof the ends of the lower surfacesof said element, and Athese bevelled walls.

Theposition of the lelement shown in Fig. 2`

of the drawing will be the normal position of said element, or the position assumed thereby in the normal progress of a shell or projectile. This element may be referred to as a wedge block, and the element or block is supported in "his position by a yoke 55 upon which the spring 43 bears.

In order to maintain the laterally extending curved arms 56 of the yoke in position toengage the surface 5| of the element 41 at the weighted ends 48 thereof, the hub .portion of the yoke has inturned portions 51 'in the tube 26 isthe provision of the reduced- 41 will be in the form of a balanced device,

in its progress through the air, this action of inoperative. solutely safe in use, and assurance is maintained as described.

. (note Fig. 4), which bear against flattened sides 58 on the tube 26. The flattening of the sides 58 of the tube constitutes one of the changes in the structure of this tube. This flattening ofthe tube also provides free movement of the tube through the opening 50 in the element or wedge block 41 in the normal advance of the member 21 in the casing 25, with the parts in the position shown in Fig. 2. The other change end portion to form the stop shoulder 59 theref on. This shoulder'is adapted to be engaged by one of the pawl like corners 52 of the element 41, as indicated in Fig. 5 in forming a wedge,

vchecking forward movement of the weightedv member 21 to such a degree as to prevent the pin 32 from engaging the cap or firing device Y of the detonatOr 33.

It will be understood that the element or wedgev so as to maintain the central position of theI element at al1 times in the proper travel of a. shell or projectile. However, in the event that, the shell or projectile develops a wobble or yaw drawing, moving the same into engagement with the stop shoulder 59. The member 21 will be maintained in this position, and assuming the pin I9 to be set in the position shown in Fig. l

r'to block the passage I8, a shell or projectile will become a dud and will not explode.

However, when knowing that a gun is faulty and will cause the wobble or yaw in the shell or projectile, the gunner can set the device 20 so as to freel sthe' pin I 9, thus permitting the shell to explode through the medium of the ring pin I6 upon impact with the objective in that the passage l 8 is cleared through the fuse. At all times, however, the delay action detonator 33 becomes In this way, the fuse becomes abthat the shell will not prematurely explode due to wobble or yaw, and if adjusted to explode, it can explode only upon impact with an objective,

The angularity of the bevelled surfaces or walls. 46 and 53 will control to a large degree the sensitiveness. of the safety or control element 41; The greater the angle on thesewalls or surfaces;

the greater degree of distortionfor wobble will be necessary to move the elementinto' the operative blocking or wedging position. Thus by changing 1 the angularities a control may be had to govern the functioning of the safety device. In any event, it is essential that thisdevice is made to function when the wobble or distorted movement is sufficient to cause the member 21 to bemoved forwardly in the casing 25.` However, it is un-- desirable to render delay action mechanismpf ajfuseinoperative if the shell ory projectilecan@ musgo-1.o.

51 be brought to its objective without:'-prel'natureY explosion. ,Onthe:otherhandpitfis .essentialthatv thedelay action .mechanism-be rendered .inoperative as Vand' when lthe wobble `or distorted movement fis suiliciently lgreat to cause y. or -bring about apremature explosion vofstheshell. Itis prefer-- able to vrender the .shellor vprojectile entirely inoperative or adud than :to take any chances on.' premature :explosion thereof..

It will=be :understood lthat the structurezasherea inrshownanddescribedillustrates one-adaptation andhuseroflthe inventionand viszshown as what: might' be termed. van attachment. vbuilt intok a. standardftype'of efuse. `'It-will be apparent,"how" ever, 4that in designing a -fuse 'to vincorporate a safety vor control element of. the type and kind under .consideratiomfa structure of lthis element will be modified to` suita` particular design Vand arrangement of fuse; j

Myxinvention comprises the use of 'a .safety control element :actuated upon .the presence'of. distorted or :wobbleomovement in ya lshell orzpro jectile, som'eti'n'ies referred'toA as va yaw, to render the fuseentirelyiinoperative,v oriat leastto render delay :action mechanismy 'of .a 'fuse inoperative. Another way to expressxthisv conception, Ywould be to say that aA fuse if provided with a safety device automatically actuated upon the presence of distorted movement in the progress of a shell will prevent premature explosion of the shell.

Itwill also be apparent that'in my invention, as disclosed in thev accompanying ldrawing, the entire mechanism of the safety device is built into, and constitutes part of the delay action mechanism ofxthe fuse and in no way changes` or .alters the structure of the fuse as 'a whole. By reason of lthis fact, standard`- delay action; mechanisms of vfuses objectionable from the; standpoint heretofore mentioned, can be recon-r structedY to incorporate, as attachments, my im proved safety device which simply adds two parts, namely the element 41 and the yoke 55, `andinodifying the member 2l to provide therein therecess for the element 4'! and modifyingthe tube 26 to` put the datv` surfaces 58 thereon and reduce the end of the tube to provide 'the stop shoulder 59- Itk will therefore be seen that undesirable fuses or delay action mechanisms of fuses having faulty properties-as now constructed, can berevised in a simple manner to render the same practical and? foolproof in operation under all existing conditions.

Having fully described my invention, what -I' claim as new and desire to secure by Letters Patent is:

l. In delay action fuses of the character described, a delay action mechanism comprising a f Weighted plunger, a detonator mounted in and movable with the plunger, a ring pin xed in said mechanism in axial alinement with respect to said detonator, a tube-fixed in said mechanism centrally'lof Asaid plunger, said" plunger having" a bevelledwall. recess .through which said tube'v is Afree k,to spass', a check. device",V mounted on the tube' andthaving bevell'edl end portions normally Y seatingin the'bevell'ed':wal1s of therecess `ofxsaid plungenai spring supporting said check device in seated position in the plunger'and theplungerjwith its detonator in spaced relationship tol said firing pin, and said tubeA and checkdevicie having portions .adapted to *irterengage in afslifted position of. said check device in said plunger to che'cl';v movementjoff `the-plunger'longitudinally offfsad tube'Jand-in supporting-"the" detonator out -of en -lj gagementwilthithe rin'gpin-" Y scribed, :a delay actionmechanism comprising a; weighted plunger, a detonatorxmounted in .and movable with the `plunger; :ai 'iringrpin .fixed in A said mechanism in :axial aliuement with respect to said detonator, .agtubefflxed `insaid mechanism centrally yof :said plunger, `said plunger ,havingV a bevelled wall .recess through which .said tube is free to pass,a Lcheckv -d'evicemounted onthe tube :and having. @bevelled-.eridv portions normally seating inzthe abevelled .walls :of the recess of said plunger, a spring supporting said .check device in Aseated Yposition'rin the: plungerand thel plunger with rits. detonator inspaced relationship to said. ring'pimsaidtubaand checkzdevice havingpor-l tions adaptedtointerengage.inra shifted position of. .said checky device said. plunger to` checkr movementA of thea'plungeri.longitudinally of saidf tube and .in supporting'the detonator out of engagement with the firing-pin, means 'keying the plunger .against 'rotation in :the mechanism' ,to`

maintainalinement ,of therring:l pin` with said detonator, :said .checkdevicef comprisingVY an .eloni gated member, la-yoke forminga Aseat for one end of' said spring, means keying .the yoke on said; tube,-;andsaid yokeihavingends'.engagingzthe .end portionsxoffsaid. checkY device;

3. In; delay 'action' mechanisms for fuses AofV the class described', a casingya:tubecentrally of andv extending into said. .casing Yfrom one .end wall thereof, .a plungermountedxinand. movable longia tudinallyrofthe` casing, means 'keying the plunger' against :rotationin saidwcasing, saidv end of thecasing having -atone'side :thereof a fixed firing pin, the plunger in alinement'with said pin having a detonator; a spring supporting thev plunger with' the .detonator thereof in wide spaced relationship to saidfring pin, means keyed to vand freely mov-- able in said. plunger :and encircling said tube for.

checking movement :ofsaidlplunger longitudinally of the casing, Va yoke between said spring and said last- :named meansf for normally supporting said meansin. centralized'rposition in said plunger," and interengaging-meansonsaidlastnamed means land-said tubeformingthe'ehcck ofthe plunger to Y maintain the detonatorrout ofoperative engagement with said ring pin in angular movement of said last knamed means* in the plunger byv the presence `of .distorted wobble or yaw movement` fcontributed` to said mechanism in the `use thereof.

d Inldelay action mechanisms for fuses of the class described, a casing, `a tube centrally of and extending 'intofsaid casing from one end wall thereof, aplungermountedinand movable longitudinally of the casing, `meanskeying the plunger" against rotation Ain said casing, said end -of the casing .having at; one side thereof a fixed ringv pin, the plunger in alinement with said pin having 'a detonator', va spring supporting the plunger devicev and? said plunger 'ar-rangedV to maintain said detonator loutA of operative engagement with. Y said' firing lpin 1in the-'event said check devicefshifts angularlywith-re'spect to said plunger due'- to,`the'presence ofi-distortedwobbleor yaw movement contributedV to said mechanism. lin the use -i W thereof,l other' means -reictuated under *the` w:i-nfl1 1-"l ence' ofleentriugallforcesfreeing the* plunger; for' asoasle.

movement longitudinally of the casing when'lsa'ld device is maintained in unshifted centralized por-' sition in said plunger, and means keying said' yoke against rotation on said tube.

5. In fuses, the combination with delay action mechanisms therefor comprising a movable member supporting the detonatorof said mechanism and a fixed member over which the movable mem-'-4 ber passes, of a check device having bevelled endl.

walls, said movable member having a bevelled wall'socket in which said device is adapted to seat, a spring supporting said ,device in seated` jectile develops a wobble or'yaw, and interen-' gaging means on said device and iixed'member in the shifted position of said device for checks.

ing movement of the movable member in said mechanism to supportl the detonator thereof non-firing position.

plunger keyed to and movable longitudinally of thev casing, a detonator mountedin said plunger',

a .'xed tube centrally of the casing and over which said plunger is movable, a spring supporting the plunger in one end of the casing, means automatically movable under the inuence of centrifugal force 'providing free movement ofthe plunger longitudinally of said casing and tube, said attachment comprising a wedge member interposed between said spring and said plunger and encircling said tube, said plunger having a bevelled -wall socket, said wedge member having bevelled walls seating in said socket maintaining centralized position of the wedge member in said plunger, a shoulder on said tube adjacent thel wedge member,A and said wedge member having' pawl-like projections adapted to engage the shoulthe plunger longitudinally of said casing and.-

tube, said attachment comprising a wedge member interposed between said spring and said plunger and encircling said tube, said plunger having abevelled wall socket, said wedge member having bevelled walls seating in said socketf maintaining centralized position of the wedge; member in said plunger, a shoulder-on said -tubeg adjacent the wedge member,said wedge ,member-4; having WW1-like"projections adapted: to engage; the shoulder of saidl-tubento support saidI merry.; ber in position checking movement ofthe plunger;v longitudinally Of--said casing, a yoke interposed; between said spring and said wedge member, and;

means keying said yoke on said tube. A

8. In mechanisms of the class describedem posed 'between' said member and plunger, said' element and member having interengaging means for blocking movement of the plunger axially of said member when said mechanism is subjected to distorted movement radially with respect to the axis' of said. member, said element having balanced ends extending radially with respect to the axis of said member, said ends having bevelled surfaces, and said plunger having a bevelled wall socket forming a seat for said element.

9. In mechanisms of the class described employing a fixed axial member and a plunger keyed with respect to and movable longitudinally to the axis of said member, a blocking element interposed between said member and plunger, said elementand member having interengaging meansfor blocking movement of the plunger axially of said member when said mechanism is subjected to distorted movement radially with respect to the axis of lsaid member, said element having balanced ends extending radially with respect to the axis of said member, said ends having .bevelled surfaces, said plunger having a bevelled wall Y socket forming a seat for said element, and tenf 6. An attachment for delay action mechanism, of fuses, said mechanism comprising a casing, a.

Florine a ixed axial member anda plunger keyed withA respect to and movable. .f longitudinally 4to tlieeripi seid infinite@` ablokiag angemietet;

, quent sional means for supporting said element in' seated position in said plunger.

10. In delay action mechanisms for fuses of the class described, a casing, a tube centrally of and extending into said casing from one end thereof, said tube having a body portion and a free end portion of lesser diameter than said body portion to form a shoulder on the outer periphery of said tube, a plunger mounted in and movable longitudinally of said casing, means keying said plunger against 'rotation in said casing, a

Wedge block keyed to but freely shiftable in said plunger, ysaid block having weightedends and an opening for encircling said tube, a yoke having a hub portion fitted around said tube, a spring encircling said tube and contained between'saidv yoke and a wall of said casing so as to exert pressure on said yoke, said yoke having laterally eX- tending curved arms bearing upon said weighted ends of said wedge block, all adapted and arranged whereby the presence of distorted wobble or yaw movement contributed to the mechanism in the use thereof causes said wedge block to shift and become engaged by said tube shoulder thereby preventing any forward movement of said plunger in said casing.

ll. In delay action-mechanisms for fuses of the class described, a casing, a tube centrally of and extending into said casing from one end thereof, said tube having a body portion and a free end portion of lesser diameter than said body portion to form a shoulder on the outer periphery of said tube, a plunger mounted in and movable longitudinally of said casing, means keying said plunger against rotation in said casing, a detonator mounted in and movable with said plunger, a firing pin xed in said mechanism in axial alignment with respect tosaid detonator, and a Wedge block keyed to and freely shiftable in said plunger, saidwedge block'having weighted ends torted wobble vorA yaw contributed to the mechanism,thereon all adapted and arranged wherebyj said Wedge block engages said tube shoulder when inv a tilted position to prevent any forward move- 'mentof said -plunger in said casing and consecontact of said nflringupin with said de to natorl f 12; a projectile having a fuse, a delay action mechanism therefor comprising in combination,= a casing, a plunger mountedin and movable-,lonl gitudinally with respect to said casing, a detonator carried in said plunger, a tube xedly mounted in said casing centrally of said plunger, a wedge-shaped block having an elongated aperture therethrough and weighted end portions on either side of said aperture, said plunger having a bevelled wall recess therein forming a seat for said block when the projectile is in steady night, spring means for supporting said block in said seated position, and inter-engaging means on said block and said tube effective to prevent forward movement of said plunger when said block has shifted due to the presence of wobble or yaw in the projectile and thereby render said detonator inoperative.

13. In mechanisms of the class described employing a iixed axial member and a plunger keyed with respect to and movable longitudinally to the axis of said member, a blocking element interposed between said member and said plunger, said element and said member having inter-engaging means for blocking movement of the plunger axially of said member when said mechanism is subjected to distorted movement radially with respect to the axis of said member, said element having weighted ends and an aperture therebetween, said ends having bevelled surfaces, said plunger having a bevelled wall recess forming a seat for said element, a yoke supported by said fixed member, said yoke having outwardly extending arms contacting said weighted ends, and tensional means for supporting said element in seated position in said plunger against accidental displacement.

14. In projectile fuses employing an impact detonator having adjustable means for rendering the detonator inoperative or operative as desired, the combination of, a casing, a tube i-lxedly mounted in said casing and arranged to allow the passage of the iiash from the impact detonator when such is operative, a balanced wedge block having bevelled end walls and an aperture therebetween, a plunger adapted to house a delay action detonator, said plunger arranged to move forwardly in said casing upon impact of said fuse, a firing pin fixed in said casing in alignment with said detonator, said plunger having a bevelled central recess arranged to mate with said bevelled end walls of said wedge block in normal progress of a projectile with which the fuse is coupled, and a pair of opposite plungei` pins resiliently mounted in said casing beneath said fixed tube so as to prevent accidental forward movement of said plunger, said pins being adapted to slide outwardly within said casing under centrifugal force releasing said plunger for forward movement, all adapted and arranged whereby said block is responsive to conditions of wobble or yaw in the projectile and tilts in such manner as to prevent the forward movement of said plunger to detonate said delay action detonator.

15. A delay action mechanism for fuzes, comprising a casing, a plunger movable in said casing, in response to deceleration, from a rst to a. second or firing position, a primer carried by said plunger, a member xed to said casing and extending centrally of said plunger, said plunger having a beveled wall recess therein forming a seat to receive a spring-biased check device in a normal or angular locked position whereby said device in said normal position is inoperative when a projectile carrying said fuze is in steady flight, said device being loosely keyed to said plunger and having weighted ends responsive in movement to yaw or wobble of the projectile thereby moving said device in said recess to said angular position, resilient means urging said member and plunger into said first position, said device and member being adapted to interengage when said device moves angularly as aforesaid to thereby positively prevent movement of said plunger into said second position.

16. In a fuze, the combination with a delay action mechanism, a first member supporting the detonator of said mechanism and movable, under deceleration from a lrst position to a second, or detonating position, a second member relative to which said rst member moves in passing from said rst to said second position, said first member having a beveled wall recess therein forming a seat to receive a spring-biased control element in a normal or angular locked position whereby said element in said normal position is inoperative when a projectile carrying said fuze is in steady flight, said element being loosely keyed to said irst member and having weighted ends responsive in movement to yaw and wobble of the projectile thereby shifting said element to said angular position relative to said first member, to thereby cause said members to interengage and positively prevent movement of said first member into detonating position.

17. In a delay action fuze, rst and second members relatively translatable by and in response to deceleration of said fuze to detonate said fuze, and a control element shiftable between a normal and an angular position and seated in a beveled wall recess in one of said members, said element being loosely keyed to said member and having weighted ends responsive in movement to yaw and wobble of a projectile carrying said fuze thereby shifting said element to said angular position relative to said member, said element when so shifted, engaging the other said member to positively prevent relative translation of said members into detonating relation.

ROGER S. SPERRY.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 1,863,838 Doe June 21, 1932 2,043,266 Rogers June 9, 1936 2,093,341 Reiche Sept. 14, 1937 2,360,043 Del Prato Oct. 10, 1944 FOREIGN PATENTS Number Country Date 520,749 Great Britain May 2, 1940

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