US3611942A

US3611942A - Detonating mechanism for a bomb fuse

Info

Publication number: US3611942A
Application number: US802111A
Authority: US
Inventors: Jakhin Boaz Popper
Original assignee: Defence Israel
Current assignee: Defence Israel
Priority date: 1968-02-27
Filing date: 1969-02-25
Publication date: 1971-10-12
Anticipated expiration: 1988-10-12
Also published as: DE1908521A1; SE357436B; NL6903044A; FR2002730A1; IL29537A; NO125703B

Abstract

A bomb fuse whose arming is dependent, inter alia, on the disposing of the fuse detonator in such a position that it is capable of detonating the booster explosive of the fuse.

Description

United States Patent [72] Inventor ,Iakhin Boaz Popper [50] Field of Search 102/86, Kiryat Motzkin, Israel 85 .6, 82, 83

1211 Appl. N6. 802,111

[22] Filed Feb. 25, 1969 References Cited 1451 Patented 061. 12, 1971 UNITED STATES PATENTS I 1 Assign/=9 The ism, Ministry of Defence 2,544,358 3/1951 Schermuly 102/86 Tel 3,146,? 14 9/1964 Moore..... l02/85.6

i351 Priority f 1968 3,261,293 7/1966 Webb 102 82 22: Primary Examiner-Benjamin A. Borchelt 2 Claims, 4 Drawing Figs.

US. Cl

DETONATING MECHANISM FOR A BOMB FUSE Assistant Examiner-J. J. Devin AttorneyKirschstein, Kirschstein 8L Ottinger ABSTRACT: A bomb fuse whose arming is dependent, inter alia, on the disposing of the fuse detonator in such a position that it is capable of detonating the booster explosive of the fuse.

PATENTED nm 1 219m SHEET 2 BF 2 lnvenlor TAKHlN BOA?- POPPER y ww Ma- W ff 4 A ttorneys DE'ION A'llNG MECHANISM FOR A BOMB FUSE This invention relates to bomb fuses and is particularly concerned with the detonator system for bomb fuses of the kind whose arming is dependent, inter alia, on the disposing of the fuse detonator in such a position that it is capable of detonating-the booster explosive of the fuse. Such a bomb fuse will hereinafter be referred to as a bomb fuse of the kind specified."

With bomb fuses of this kind various forms of mechanisms cambe employed for moving the detonator into position for detonating the booster explosive. One such known mechanism is arranged to be driven by an impeller carried by the fuse and arranged to be released for rotation under the influence of the airstream after release or launching of the bomb. Rotation of the impeller is transmitted via suitable gearing so as to displace -the detonator into an armed position vis-a-vis the booster explosive. with hitherto known detonator mechanisms the detonator is shielded from the booster explosive prior to the full arming of the fuse by means of a heavy brass-lead cup plate.

it is an object of the present invention to provide a new and improved detonating mechanism for a bomb fuse.

According to the present invention there is provided a detonating mechanism for a bomb fuse of the kind specified comprising a detonator housing, a recess formed in the housing adapted to receive the detonator and communicating via a bore formed in the housing with a cavity formed in a booster explosive, a displaceable element displaceable in said bore from a first position in which it bars communication between said recess and said cavity and a second position in which said communication can take place and biasing means located in said recess for biasing the detonator towards said bore so that when said element is in said first position said detonator abuts said element.

Preferably a further recess is formed in said housing communicating with said bore and designed to accommodate the igniter, said further recess being shielded from said first recess and from the booster explosive by said element when the latter is in its first position and communicating with the bore and the cavity in the booster when the element is in its second position.

Preferably the means for displacing the element from the firstto. the second position is as described in our copending patent application copending U.S. Pat. application Ser. No. 802,l 10.

One embodiment of a bomb fuse in accordance with the present invention will now be described by way of example and with reference to the accompanying drawings in which:

FIG. 1 is a partially sectioned elevation of the bomb fuse,

FIG. 2 is an elevation of the same bomb fuse partially sectioned along the lines llll of the view shown in Fig. 1, while FIGS. 3 and 4 are similar views of the bomb fuse in a second stage of operation.

As seen in the drawings, the bomb fuse comprises a casing having a conical nose portion 1 and a substantially cylindrical body portion 2, a screw-threaded portion 3 being formed at an intermediate position on the body portion 2 so as to enable the fuse to be screwed into the body of the bomb (not shown).

A rotary screw shaft 5 is coupled to an impeller (not shown) and extends into the cylindrical bore 6 formed in a rod 8 which depends downwardly from a piston 9 constituting part of a dashpot mechanism 10. This mechanism 10 is described in detail in our copending patent application copending U.S. Pat. application Ser. No. 802,110 to which reference can be made for further details. The cylindrical body portion includes a detonator housing 11 having a central bore 12 in which is slidable the rod 8. The lowest portion of the fuse housing accommodates a booster explosive 13 in which is formed a traplike cavity 14 having an upper defining wall 140 in which is formed a cavity inlet 14b, and a sidewall 140 which is inclined at an acute angle with respect to the upper wall 14a, communicates with the central bore 12 of the detonator housing 1'] via cavity inlet 14b.

An inclined recess 15 is formed in the detonator housing 11 this recess accommodating an elongated substantially cylindrical detonator 16 and a biasing spring 17 which bears against one end 16a of the detonator l6 and biases the detonator 16 towards the central bore 12. The rod 8 is formed with a notch 18 which, in the position of the rod 8 shown in Fig. l of the drawings, is disposed adjacent the recess 15 formed in the detonator housing 11 so that the opposite end 16b of the detonator l6 remote from the biasing spring is located in the notch 18.

Diametrically opposed to the inclined recess 15 is formed a horizontal recess 19 in which is located an electrically actuated pyrotechnic igniter mechanism 20 which is of standard construction and need therefore not be described in any detail. The outer, electrically conductive casing of the igniter mechanism 20 is electrically connected to the conductive housing 11 via a compression spring 21 retained within the recess 19 and serving to bias the igniter mechanism away from the central bore 12. An insulated, arrow-shaped contact 21a bears against an opposite end of the igniter mechanism 20 and is adapted for connection to an electric igniting circuit (not shown). When this igniting circuit is made, the igniter mechanism 20 receives an electric igniting impulse via the contact 21a and the housing 11 as a result of which an igniting flame is emitted by the igniting mechanism in the direction of the central bore 12.

As seen in Figs. 1 and 2 of the drawings with the rod 8 and the piston 9 located in its downward position the detonator I6 is completely shielded on the one hand from the igniter 20 and is prevented from falling into the cavity 14 formed in the booster explosive 13. Furthermore by reason of the particular manner in which the detonator 16 abuts the rod 8 the detonator 16 is retained in its safe unarmed position irrespective of the accelerating forces which are exerted on the bomb fuse during launching or release or in the event of a sudden premature impact.

When however as a result of the displacement of the rod 8 and its associated piston 9 by a mechanism for example as described in our copending patent specification copending U.S. Pat. application Ser. No. 802,1l0the rod 8 is moved upwardly, the detonator 16 is projected by means of its compression spring 17 out of its recess 15 through the bore 12 and into the cavity 14 formed in the booster explosive 13 and the end 16a of the elongated cylindrical detonator 16 strikes the inclined wall 14c of the cavity 14 and in consequence the detonator 16 turns around in the cavity 14 so that its elongated axial dimension faces the upper cavity wall 14a. Thus the particular shape of this cavity 14 is such as to constitute a trap so that even though the fuse may suffer a considerable shock upon impact the detonator cannot move back into its original recess. Furthermore, as a result of the upward movement of the rod 8 communication is effected between the horizontal recess 19 in which is located the igniter 20 via the bore 12 and the cavity 14 so that when the igniter 20 receives its igniting impulse the flame emitted by the igniter 20 can reach the detonator 16 so as to ignite it.

While in the embodiment described above the means for displacing the rod have been described as those illustrated and referred to in our copending patent application, it will be realized that any other suitable displacing means can be employed which results in the axial displacement of the abutting rod after a predetermined delay period.

1 claim:

1. A detonating mechanism for a bomb fuse whose arming is dependent, inter alia, on the disposing of a fuse detonator in a position where it can detonate a booster explosive of the fuse, said mechanism comprising: a detonator housing, a housing wall defining a first recess in which an elongated detonator is located, said housing walls further defining a second recess, detonator-igniting means located in said second recess, said housing walls further defining a third recess in which said booster explosive is located, means for forming a traplike cavity in said booster explosive and including cavity walls defining element is displaced into the second position the detonator is projected by said biasing means through said cavity inlet into said cavity interior and displacement of the detonator out of the cavity is inhibited.

2. A detonating mechanism according to claim 1, wherein said rod has formed therein a notch in which in the first position of the rod is located the end of the detonator.

Claims

1. A detonating mechanism for a bomb fuse whose arming is dependent, inter alia, on the disposing of a fuse detonator in a position where it can detonate a booster explosive of the fuse, said mechanism comprising: a detonator housing, a housing wall defining a first recess in which an elongated detonator is located, said housing walls further defining a second recess, detonator-igniting means located in said second recess, said housing walls further defining a third recess in which said booster explosive is located, means for forming a traplike cavity in said booster explosive and including cavity walls defining a relatively restricted cavity inlet and a relatively widened cavity interior, means forming a housing bore communicating on the one hand with said cavity inlet and on the other hand with said first and second recesses, a displaceable element displaceable in said bore from a first position in which it bars communication between first and second recesses on the one hand and said cavity inlet and a second position in which said communication can take place, and biasing means for biasing the detonator toward said bore so that when the displaceable element is displaced into the second position the detonator is projected by said biasing means through said cavity inlet into said cavity interior and displacement of the detonator out of the cavity is inhibited.