US2458479A - Setback switch - Google Patents

Description

Jan. 4, 1949. T, M, PERRY 2,458,479

sETBAcx swITcH Filed April 28', `194:5

' l Lu l [6 N q c b /4 i [3 Il FG.3. `Fl 4 l x u /9 1! /6 i I lNvx-:N'roR f THOMAS M. PERRY LIEU! Patented Jan. 4, 1949 I I E u NLT En; retener or Slieuffiex suggeriti t Themes; germ enpineeue, @esistere taas, renreeeutesl.

Atiplieetiommirzs, meetinstrumenten (eleganza-52u S f l This inventionrelateato; switches-and more. erlthereim Theenumerat I0 indicates, the body,

particularlytoisetbeelesvvitehes vthiehzerzetedeger- Qf the dey-ieee WhhiA ferme@ Off Suitable inSur ed to bemountedin;expiosivenroimtiles;fonqlpsr letine; meterieduandxmeyvhe a. udrtionef a body ine. atieasua; portion an eleotrieeltdetpnetinef ef; ernennen on other component- Withinthe circuit. preiectileit Aboref II. extends,.- throughmhe'body The; prior artdevicesofitnisnature'havefbeen: maudiliesiarestrfeted eerbied '2f etzitsrear or dependent; uponV operation;v btt movement; Qii nur mwetend,f.,K Ateilndricelfoontactt sleeve I.3, which merous, mechanical par-tsj.' Many; o fy; these; :new is formed of 'tubular copper or other suitablecpny ohanioai parts must4 be. precision medeenei ine duetivefmeteliis ereeeifltted erdthertwise securely terttedin azcomparativelu s -melksreees- 'lheree 110# mounted Within the herev Ll` Wire: L4., which fore.- it; hasrequired; mucha-ima andsvkiilitoimenefermsteue; Side...l Qf the; eleetrfieelg Circuit C, is, seluraotnie. setback. switches and; the eis-pense i-eederedienotherwieeseeuredfto-.thefeylindrical edn,- voived: has been. reiatizvseiyfhigh elsa. the seit-1 teet member I3 et 15- Wire. IIiivrhiehf-.ermsthe back switches of the prior art have usuallyfheen; r other;sidaoffthgaletricalgqigcuikcj'is mounted dependent upon atsingleepui-nttorconteet, which le* thrnuehthe-lestrietesiaeeeuinef I2 et here. IeI and pointv off contact, fon some reason; on othemheee istseeilielyfltelli 0F: @erweitert therein; by a; sleeve occasionally fauceta to close,- tnef eleetrioalt cireuitr, I :lather sleeve Il beine: mess iteriiwithnf the; re,-

An object off thisinventiom isinreyide aisee Striatediegeeine; I.2.-. back switch.` whiohmayberzmquntedih; eeplgiy@ l Similmi. exble; metallic` csrtect wire projectiles to maintain; am electrisch detonaliinea 29 I 8 is secured to wire I6 by soldering; le; Theconeircuitopened untilftheipnojectilerhasebeen.firedi. '18,: entende. aiiiellyi. 'Ihecontaet: wire after which. the; acceleration:- of the,p1;ylijetzle;` L83 wllillprtmllhtfliemrrintherppsition, astshown creating. e. setbackv force; wiiiect-.uatatbeiswitchi ini Figure@ 1. duef te] its: own: semi-resilience. but toclosethe circuit. it is suiiciently ductil-e so thatit mayybe easilyv Another object ofv the-I invention. isrtpmvidef 2% compressed or deformed into ilexble engagea setbackswitch wherein; a; pluralitysofcontis mme Witht the@ Siugr,ophaling`v sleeyef; l;l-, and will will be made, any. oneoff which wille-cloSe-fattleast; remettra in; ite detonmeg, position, A, plunger1 2 65 a portion of4 an electricalidetonatnemmcuit; preiegaplg, formed; or' insulating; material; is po- Anotherobject. ofthe invention is:` to: provider sitiorielwithim thefccntactsleeve, I3; and has a a setback switchwhichzis;extremely:simpleiin one qrelativelyf loose itg therein, However, the friceratlon, positive inX function, andi wherein; pre. tique-l' erigemnk between the plunger ZIJ and cision made mechanicalfparts.; are elminatedt theeeylndinal Contiwt, sleeve.A I3;is.sufi`1cient to Otherobjects of: the invention will' appearafterv proj/,ente longitudinak movement off the plunger an. inspection of the following description. wlthiiui thrsieevfe; unders al1 normalzhandling con- In the drawings: mi dimmer. 0E'. thea pI-'Qjectim Whenthe proj ectiley is Figure 1 is a verticalz sectional:l viewfof' theme ned. fille: acceleratom thereor creates, suicient vention, showing the samelmountedf.withinapo r..I setback.: ienne.V to; cause, the plunger Z0: to slide;

tion of an electrical detonating-circuit, the switch?l rearward within, the sleeve,.- lz33, toward4 the! 11e being-vin opened position;- 7 stricted portion; l-Zlorbore hl.

Figure 2 is averti-cal-sectional-view of the -inplungen 2li; is., provided; with. an axially vention showing the position of thev parts when ppsitignedf, b or@` 2,1, fprnling; a pocket. which` ex'-` the switch has been closed bythe-force; off' set;- tenlg; frein the.- rearf ofi; the. plunger forwardly,

back created when the projectile-isredf:ll buittermnatesshort of: the: forward` end thereof. Figure 3, is a, perspective-view: rif:J ehi electrical 45 reen on lower end' off here..v 21a has an. out-A contact sleeve; f wardiy poration Itowillzbe apparent' by Figure 4 is. a perspeetiveviewotthe collapsible onefskliedsinitne ant; that-the form ofrthe eared contact element; and, portions 22' may; be,l varied'V from that disclosed;

Figure 5 is an inverted= perspective view of'the and; obyiously; the form will; depend@ primarily plunger. my upom theilengthwfthe-bore 21k within the plunger Referring now to the. drawings, and particug- *2ltg thellengthof: the Contact.. wire L8: and'. the lar-lyvv to Figure 1 thereof, it willheseen thajgthe diameteuoifcqntactsleeva I3. switch which forms the subject matter of' this n- The operation? olif the. deyice will be, readily vention is adapted to be mounted in an electrical under stocd'-from the. foregoing description. The detonating circuit C, the circuit having a prox- 55 plunger 20 is positioned within the contact sleeve imity fuze and a source v,of current B incorporat- I3 so that the contact wire I8 will extend within 3 the bore 2I of plunger 20. When the parts are in this position, as shown in Figure 1, the circuit is broken because of the space between contact wire I8, which forms an extension of one side of the circuit, and contact sleeve I3, which forms an extension of the other side of the circuit. When the projectile is fired, the setback f orce created by the acceleration ofthe projectile'.forces the' plunger rearwardly. As the plunger moves rearwardly, the contact wire I8 will bend and` tact sleeve in spaced relation thereto and having assume the position as shown in Figure 2. When a portion thereof extending into said bore in said in this position, the wire I8 will make a plurality .Y

of contacts with sleeve I3, thus closing the cirthe projectile striking an object aftrfbeing rje cuit C. In caseof reverse setback, 'occasioned bynf,"

the plunger 2D will move forwardly, but in view' of the fact that the wire I8 isnot directly con- ""F nected to the plunger 28, the forward movement of the plunger will not affect the wire I8, and thev latter will remain in its collapsedposition, thus maintaining circuit C closed. lIt`wi1l be under'- stood that while three points of contactI are shown between wire I8 and sleeve I 3, a largery or smaller number of contacts may be obtained by varying the length of wire I8 or its resilience, varying the diameter oi sleeve I3, or varying the length of bore 2| and/or the shape of the iared portion 22 thereof. n

From the foregoing description, it will be seen that the subject matter of this invention is ex'- tremely simple in operation andr positive in function, and that it can be easily and cheaply made and assembled. 7

One of the particular advantages of my improved setback switch is that it will not be operated by repeated small shocks. That is to say, if the switch is jarred it will be reset to its normal inoperative condition by the action of the spring wire I8, which will move the plunger 20 to its original position. f f It is also desired to point out that my improved switch may be easily short-circuited for the purpose of testing a complete circuit in which the switch may be wired. I claim:

1. A setback switch adapted to be mounted within a projectile to close at least a portion of an electrical detonating circuit upon the application of setback force created when the projectile is red comprising a body member, a bore in said body member, an electrical contact sleeve posi-` tioned within said bore, elongated bendable contact means mounted in said body member and extending within said contact sleeve in spaced relation thereto, and a plunger positioned within said sleeve capable of sliding therein upon the application of setback force for bending said elongated contact means into a plurality of contact engagements with said contact sleeve. i s 2. A setback switch adapted to bev mounted within a projectile to close at least a portion of an electrical detonating circuit upon the application of setback force created when the projectile is ired comprising a body member, a bore in saidbody member, an electrical contact sleeve positioned within said bore, a wire mounted in saidV body member and extending within said contact sleeve in spaced relation thereto, and a plunger positioned within said sleeve capable of sliding therein upon the application of setback force .for bending said wire to make a plurality of contacts between said wire and said contact sleeve.

-3. A setback switch adapted to be'.rnounted 4 within a projectile to close at least a portion of an electrical detonating circuit upon the application of setback force created when the projectile is red comprising a body member, a bore in said body member, an electrical contact sleeve positioned within said bore, a plunger positioned Within said sleeve capable of sliding therein uponthe application of setback force, a bore in said plunger, and a wire mounted in said body member and extending axially within said conplunger, the sliding movement of said' plunger ywithingsaid sleeve causing said wire to bend and makjaplurality of contacts with said contact sleeve.'

m14.v A setback switch adapted to be mounted within a projectile to close at least a portion of an electrical detonating circuit upon the application of setback force created when the projectile is iired comprising a body member of insulating material, a bore in said body member, an electrical contact sleeve positioned within said bore, a plunger positioned within said sleeve capable of sliding therein upon the application of setback force, a bore in said plunger having an outwardly ared portion at its outer end, and a wire mounted in said body member and extending withincontact sleeve in spaced relation thereto and having a portion thereof extending into said bore in said plunger, the sliding movement of said plunger causing said wire to bend outwardly to make a plurality of contacts with said contact sleeve.

5. A. setback switch adapted to be mounted within a projectile to close at least a portion of anl electrical detonating circuit upon the application of setback force created when the projectile is fired comprising a body member of insulating material, a bore extending through said body member, said bore having a, restricted portion at its lower end, an electrical contact sleeve positioned within said bore, adapted to be connected to one side of the electrical detonating circuit. a plunger positioned within said sleeve capable of sliding therein upon the application oi setback force. a bore having an outwardly flared portion in said plunger, and a wire mounted in said body member extending axially within said contact sleeve in spaced relation thereto, and having a portion thereof extending into said bore in said plunger, said wire entering the body member through the restricted portion of said bore, and forming an extension of the other side of the electrical detonating circuit, the sliding movement of said plunger causing said wire to bend outwardly to make a plurality of conta-cts with said contact sleeve.

THOMAS M. PERRY.

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

UNITED STATES PATENTS `6&5

Number Name Date 1,845,848 Richards Feb. 16, 1932 2,420,028 I Bleakney May 6, 1947 FOREIGN PATENTS .70 Number Country Date YFrance Aug. 25, 1925

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