IL29537A

IL29537A - Detonating mechanism for a bomb fuse

Info

Publication number: IL29537A
Application number: IL29537A
Authority: IL
Original assignee: Popper J; Israel State
Priority date: 1968-02-27
Filing date: 1968-02-27
Publication date: 1972-04-27
Also published as: NO125703B; US3611942A; SE357436B; FR2002730A1; NL6903044A; DE1908521A1

Description

A detonating mechanism for a bomb fuse JAiCHIW BOAS POPPER and STATE OF ISRAEL, MINISTRY OF DEFENCE - This invention relates to a detonating mechanism for bomb fuses and is particularly concerned with the detonator mechansims 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 can be 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 whose arming is dependent, inter alia, on the disposing of a fuse detonator in a position wherein it can detonate a booster explosive of the fuse, said mechanism comprising: a detonator housing, housing walls defining a first recess in which said detonator is located, said housing walls further defLning 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 forming a cavity in said booster explosive, means forming a housing bore communicating on the one hand with said cavity and on the other hand with said first and second recesses, a dis-placeable element displaceable .in said bore from a first position inwbich it bars communication between said first and second recesses on the one hand and said cavity and a second position in which said communication can take place, and biasing means for biasing the detonator towards said bore so that when the displaceable element is in the second position the detonator is biased into said cavity.

Preferably the means for displacing the element f om the first to the second position is as described in our co-pending patent application No.

One embodiment of a detonating mechanism for a bomb fuse in accordance with i: e present invention will ntDwbe 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; Pig. 2 is an elevation of the same bombfuse partially sectioned along the lines II-II of the view shown in Pig. 1, whilst 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 ex ends into the cylindrical bore 6 formed in a rod 3 which depends downwardly from a piston 9 constituting part of. dash pot mechanism 10. This mechanism 10 is described in detail in our co-pending patent application Νο.^.^'ΓΉ" o .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 3 in which is formed a trap-lilce cavity 4 which communicates wi h "the central bore 2 of the detonator housing 11.

An inclined recess 15 is formed in the detonator housing 1 this recess accommodating a detonator 16 and a biasing spring 17 which 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 Pig* 1 of the drawings, is disposed adjacent the recess 15 formed in the detonator housing 11 so that the end of the detonator 16 remote from the biasing spring is located in the notch 18.

Diametrically opposed to the inclined recess 15 is formed a horisontal recess 19 in which is located an igniter mechanism 20 biased away from the central bore 12 by means of . a compression spring 21..

As seen in Pigs.1' and 2 of the drawings with the rod 8 and the piston 9 located in its downward position the detonator 16 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 whic the detonator 16 abuts the rod 8 the detonator 6 is retained in its ■ safe unarmed position irrespective of the accelerating forces which are exerted on, the bor 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 co-pending patent specification the rod S is moved upwardly, the detonator 16 can be freely 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 3. 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 1 in which is located the igniter 20 via the bore 12 and the cavity 4 BO 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.

Whilst in the embodiment described above the means for displacing the rod have been described as those illustrated and referred to in our co-pending patent application, it will be realised that any other suitable displacing means can be employed which results in the axial displacement of the abuting rod after a predetermined delay period. > - 6 - 9537/?

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 wherein it can detona te a booster explosive of the fuse, said mechanism comprising: a detonator housing, housing walls defining a first recess in which said detonator is located, said housing walls further defining a second recess, detonator ignxting means located in said second recess, said housing walls further defining a third recess in which said booster explosive is located, means forming a cavity in said booster explosive, means forming a housing bore communicating on the one hand with said cavity and on the other hand with said first and second recesses, a displaceable element dis- placeable in said bore from a first position in which it bars communication between said first and. second recesses on the one hand and said cavity and a s econd position in which said communication can take place, and biasing means for biasing the detonator towards said bore so that when the displaceable element is in the second position the detonator is biased into said cavity.

2. A detonating mechanism according to Claim 1, wherein r said displaceable element is constituted by a rod which has^ formed therein a notch, in which in the first position of the rod, is located the end of the detonator.

3. A detonating mechanism according to Claim 1 or 2, wherein said cavity is shaped so as to constitute a trap whereby, once the detonator is located therein, the subjection of the fuse to an impact cannot result in displacement of the detonator out of the cavity. - 7 - 29537/2

4. A detonator mechanism substantially as hereinbefore described by way of example and with reference to the accompanying drawings . For the Applicants DR. REINHOLD COtfN AND PARTNERS