Патент USA US2412636код для вставки
Dec. 17, 1946. 2,412,636 F. SHORT GRENADE FUSE Filed Feb. 18, 1943 26 L Patented Dec. 17, 1946 NHTED STAT S 2,412,636 GRENADE FUSE v Short, Canton Center, Conn. , Application February 18, 1943, Serial No. 476,300 8 Claims. ' (01.‘102-64) (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757), - The invention described herein ‘may be manu factured and used ‘by or for the Government for governmental purposes without the payment to me of'any royalty thereon. - ‘ holding function to opeting lever 9, which-le ver, asis usual, is integral with the fuse cap . such as that designated by' Hi. The lever's posi~ \' tion normally,‘ relative to the grenade body, is that shown, wherein it .will be grasped together with the body in the act of throwing the grenade, and when the whole device is free of the hand, the cap and lever are kicked off by the striker and the released striker then strikes the primer to inaugurate the functions of the powder trains to set off the main bursting charge.- All of ‘the parts and their functions, thus far described, are old and well known in the art. Communicating with the chamber 3 is a cylin This invention relates to a combined tlme'and percussion fuse especially adapted for hand gre nades, although not limited to such use. The object of the invention is to provide a ’ dependable fuse that will explode the main gre nade charge after a predetermined calculated time or delay period, but upon impact will cause ’ instantaneous explosion- of the main'charge if the delay period has not‘ expired or if the delay elements fail to function. ' In the drawing: ~ 15 -~ ’ Fig. 1 is a central vertical section of the fuse, applied to a grenade. ' r . drical chamber ll of a little less diameter than the conventional chamber, thus presenting a shoulder l2, forming a seat for a'seal I3 protect Fig. 2 is a cross section taken on the line 2-2 ing the primer M in chamber ll. Below the of Figure 1, showing the preferred form of the primer chamber is a bore l5 separated from the safety plug in the upper part of the fuse. . 20 chamber ‘I I, by an. apertured web l6, the aper ’ Fig. 3 is a similar view taken further down and ture establishing ‘communication between the on the line 3-3 of Figure _1. _ v chamber and bore for the ignition of a' com Figure 4 is a view, of the fuse taken still lower pressed powder delay pellet il formed with a down and on the‘ line 4-4 of Figure 1, showing a ‘central opening to receive a needle 23 and adapt preferred arrangement of the‘quick match ele ed to burn away therefrom, for a reasonto be ment with relationto the detonator. , ' v ‘ explained. The pellet n is' contained in shell Fig. 5 is an enlarged sectional view of the fuse l8 which is open at its lower endand ?rmly se in the neighborhood of the detonator. - cured in the bore I5. supported'in the upper Fig. 6 is a vertical sectional view showing the end of the shell is a plug l9, formed with a small \ relation between the packed powder delay trains 30 concave central depression 20 in line with and and the means for locking and keeping them immediately below the central aperture in the locked in separated position under. some condi web IS. The plug is preferably perforated at three points in its perimeter with openings 20' Fig. 7 is a similar view of thesame parts, in and it is further formed, preferably, with a cen tions. “ slightly modi?ed form.‘ . ' ’ ' ' In the fuse about to be described, some; parts ' are old in the art, as for instance the Bouchon head is adhered to, especially inv so far as its upper structure is concerned, which involves the throw-off cap,'the operating lever and the striker;v but the parts below‘ the head proper present a. novel arrangement. In the drawing, l designates the grenade body, tral comparatively sharp point 2!, to be received in a slight depression 22, in the upper end of the needle 23, whose lower end is pointed and re ceived in a correspondingly shaped recess 24, in the upper enlarged head 24' of a tube 25 the bore ‘of which merges ‘into ducts 26, at the upper end vof the bore. The'bore, as well as the ducts, con tain a'compressed powder pellet 26'. Near the lower end of the tube a slight reduction in diam which is of the usual or common construction - eter forms a shoulder which engages the edges of wherein the body is scored for greater fragmen tation. The numeral 2 designates the fuse head provided with a chamber 3, having its top and a circular opening in a ring 28, ?rmly secured in the lower portion of a tubular extension 29 of one side open. Integral ears 4 are providedvat one side of the chamber to support the short ' the head 2. The ring may be held inthe ex tension by crimping as shown, and its underside is a little above the end of the extension, which shaft 5, upon which the spring steel wire striker 50 extension is slightly inturned to form an annu 6 is‘mounted, and ears 1, apertured for the pas lar flange 30, forming aseat for the ?ange 3| sage of the cotter pin safety 8, which engages an of the detonator 32, which is held ?rmly in place arm of the striker to render it inoperative until by reason of the engagement‘ of‘its ?ange with such time as the grenade is to be thrown, when 1 the underside of the ring 28. The ring has a the pin will be withdrawn, transferring the striker‘ cone shape concavity in its underside into which. aciacsc - - 3 4 train for igniting said detonator and having a portion thereof for retaining said dislodgable the slightly reduced lower end of the tube ex-. tends, the end of the tube with the wall of the ring forming an annular recess which is packed means in locking position to render said friction device inoperative, said locking means adapted to be dislodged only after that retaining portion with quick match material 33, ignited by the > roughened portion 34 of the tube upon the move ment of the tube, which movement occurs under of the fuse train in contact with said dislodgable means has been ?rst ‘consumed and then upon certain conditions presently to be described. impact of said body to permit the spring urged Interposed between a shoulder 35, adjacent the member to ignite the friction primer, to cause upper end of the tube, and a washer 36, prefer ably of lead, which rests on the ring 28, is a heli 10. instantaneous explosion of the charge uDOn im pact of said body. , . cal spring 36' urging the tube toward theshell 2. A grenade fuse comprising a hollow body l8, but the tube is prevented by the needle 23 containing an explosive charge, a closure for said from reaching the shell until such time and un body having an extension extending into said der such circumstances are are contemplated for ' charge, a percussion primer in said closure, a the organization. ' delay powder train in said closure ignitable by As shown in Figure 1, the grenade body is the percussion primer, a detonator carried by the threaded on the fuse head in the usual manner, extension within the explosive charge, a chan with the usual washer, ordinarily of steel, hav neled member in the extension having one end ing a lateral extension engaging the operating in contact with the detonator and the other lever and serving to seal the Bouchon. spaced from said delay powder train and having Referring to Figure 7, there isshown a slight a friction device, a friction primer in the exten modi?cation of the form of the plug l9 and its sion in proximity to the friction device, dislodg associated needle, with the needle pointed at its able means supported by said powder train and upper end and a shallow cavity in the bottom in engagement with the channeled member to of the plug. normally prevent movement thereof, means caus In operation the safety pin 8 is withdrawn, and ing movement of the channeled member upon the grenade with the lever pressed against its dislodgment of said dislodgable means to ignite body is thrown. As soon as the grenade leaves the friction charge upon impact of said hollow the hand, or other instrumentality by which it may be thrown, the striker 6 will kick the lever 30 body, and a second delay powder train in the channeled member communicating with the det and cover off, permitting the striker to strike the onator and ignitable by the first mentioned pow primer H, which will ignite the compressed pel der train and capable of igniting the detonator let H, which in proper time, will ignite the pellet independently of the operation of the friction 26' in the tube 25, and after a predetermined device. time, ?gured in seconds, the pellet 26' will ignite 3. In a combination time and impact fuse, a the violent charge in the detonator 32. This is hollow body containing an explosive charge, a the normal and expected action of the fuse. However, should the grenade land before the ' delay powder train in said body, means for ig niting the train, a second delay powder train powder trains have gone through their predeter mined and completed routine, the impact of land 40 ignitable by the ?rst powder train, a detonator ing will cause an instantaneous explosion of the main charge for the reason that‘ by the time im within the charge and ignitable by the second ' powder train, a separate means capable of ignit pact occurs the powder pellet H, in which the ing the detonator independently of the second powder train, and means retained by said ?rst delay powder train and operable upon the same being ?rst consumed and then upon impact of said body to release said separate means to ignite said detonator to cause instantaneous explosion of the charge. 4. In a combination time and impact fuse, a hollow body containing an explosive charge, a percussionv primer and a delay powder train in ‘needle 23 is embedded will have been consumed, but not necessarily the other powder train 26' in tube 25. As a result, the needle 23 will then be left unsupported except at its ends by the plug l9 and the head 24’. The shock of impact will cause the needle 23 to assume an unstable tilted position thus disturbing the alignment between ' the needle 23 and its supporting elements l9 and 24'. The head 24', tending to be moved up wardly under the influence of the spiral spring 36', will further disturb this alignment resulting in a dislodgement of the needle 23 to permit the -' pretensioned spring 36' to raise the tube, and in so doing, the roughened end 34 thereof will in stantly ignite the detonator charge. Thus, the shock of impact, irrespective of how the grenade lands, will be su?icient to cause dis lodgement of the needle 23. Should the grenade by chance ?rst land or hit end-?rst, it would not remain on end but would tumble or turn over due to its momentum which would cause dislodge ment of the needle 23 permitting the tube 25 to function in the manner already explained. said body and ignitable by the percussion primer, a movable member spaced from said train and containing a second powder train ignitable by the ?rst train, a detonator within the charge and ig nitable by the second train, a detonator igniting primer capable of igniting the detonator inde pendently of the second train upon the movement of said movable member, means normally locking said member against movement, said means being dislodgable upon impact, and means causing movement of said member upon dislodgment of said locking means to ignite the detonator primer to cause instantaneous explosion of the charge. 5. In a combination time and impact fuse, a ,hollow body containing an explosive charge, per cussion primer and a delay powder train in said 1. In a fuse, in combination, a body containing body and ignitable by said primer, an extension an explosive charge, a detonator in said charge, a friction primer for igniting said detonator, a 70 carried by and within said body and having a detonator in said charge, a movable tubular mem member having a friction 1-portion for igniting ber in said extension spaced from said train and said primer, spring means for urging said mem containing a second powder train ignitable by the ber relative to said friction primer, dislodgable ?rst train, said detonator being ignitable by the means for normally locking said member against movement relative to the friction primer, a fuse 75 second train, a detonator igniting primer capable I claim: ‘ 1 2,412,686 -5 .' . . second train, means interposed between the ?rst > ._ _ vided with a powder train extending between‘ said . powder train and said member normally locking said member against movement, said interposed means being dislodgable upon impact of the body, and means causing movement of said member upon dislodgment of said locking means to ignite 6 friction member, a movable friction member hav ing a friction portion in' said primer and pro of igniting the detonator independently of the pellet and detonator and capable of igniting said detonator, a dislodgable member embedded in and normally at least partially supported by the ' pellet and adapted to be dislodged upon impact the detonator primer to cause instantaneous ex plosion of the charge. of the body after the destruction of said pellet, said dislodgable member having a portionengag 6. In a combination time and impact fuse, a 10 ing the friction member normally holding said member against movement, and means for mov hollow body containing an explosive charge, a closure for said body having a hollow extension extending into said charge and having a detona tor at its inner end, a percussion primer in the closure, a shell in the closure and containing a [5 compacted delay powder pellet ignitable by said ing said friction member when released by said dislodgable member to ignite the friction primer and thereby the detonator. . 8. In a grenade, a body having an explosiv charge, a detonator for said charge, means for instantaneously igniting said detonator, means including an element in alignment with and hold ing said igniting means in an inoperative posi taining a delay powder train capable of igniting tile detonator, a. pretensioned spring normally 20 tion, a percussion primer in said body, a time delay fuse train adapted to be ignited by psaid urging said tubular member toward the shell, a primer and in turn ignite said detonator, said second primer actuated by said tubular member upon the movement of said member to ignite the _ time-delay fuse having a portion thereof re taining said element in position to hold said detonator upon impact of said body independ ently of the powder train in said member, a pin 25 igniting means in the inoperative position, said holding means becoming inoperative to hold said embedded in the powder pellet and in engage igniting means in the inoperative position only ment with said plug and with the tubular mem after the said portion of the time-delay fuse re ber, to ,hold said member normally separated from the shell, said pin being adapted to be _ taining said element has been ?rst consumed dislodged upon destruction of the powder pellet 30 and-then upon impact‘ of the grenade body, whereby after a preliminary predetermined peri and upon impact of said body, and means caus- ' - od has elapsed after ignition of the delay fuse. ing movement of said tubular member upon dis train has been initiated by the percussion primer lodgment of said pin to ignite the second, primer and in which period said‘ retaining '; portion of and cause instantaneous explosion of explosive charge. 7 ‘ 35 said time-delay'fuse‘ will- have been consumed, , 7. In a time and impact fuse, in combination, said detonator-will'be ignited either by the time a hollow body having an explosive charge therein, delay fuse trainvat the termination of its delay a percussion primer, a compacted powder pellet period or by said ?rst-mentionedigniting means primer, an apertured plug in said shell, a mov able tubular member in said extension and con ignitable by said percussion primer, a. friction ‘ primer in said body, a detonator adjacent said 40 upon impact of the body: whichever occurs ?rst. , v ' FRANKSHOR'I‘.