IL29763A

IL29763A - Electrically ignitable control element,especially for ammunition

Info

Publication number: IL29763A
Application number: IL29763A
Authority: IL
Original assignee: Dynamit Nobel Ag
Priority date: 1967-04-07
Filing date: 1968-04-05
Publication date: 1972-12-29
Also published as: DE1646335B2; DK122349B; GB1221105A; IL29763A0; BE713288A; DE1646335A1; FR1567316A; DE1646335C3; NO122693B; US3541920A; NL6804814A

Description

Electrically ignitable control especially for ammunition NOBEL LLSCHAFT This relates to spring urged actuatin and particularly to spring urged actuating elements which are fired Control elements for mechanical which are also are normally elements constructed similarly to in which a piston arranged in a tube is moved a metal is bulged by firing a propellent charge which burns with comparatively little formation arranged the in order thereby remotely to cause or to for a switching or control The firing of the propellent charge is effected in such cases by means of an igniter element or an electric primer which can be operated With known in which a piston is moved in an outward it is accurately and safely to fix the piston the tube before and after the movement into the end which is for examplef when the actuator is used in a rocket in order to prevent an undesired According the present invention there is provided an actuatin element comprising an elongated member capable of being axially moved in a a combustible charge and means for igniting the combustible the elongated member being in a first position against the action of a resilient by a metal member located between the combustible charge and the elongated the arrangement being such in ignition of the combustible charge results in generation of h a wh h m h elongated member to retain it in the second Preferably the means for igniting the combustible charge is an electrically operated igniting It is possible to construct actuators in accordance with this invention in various ways to correspond to the actual purposes or It is essential that the oombustible charge be so that it develops sufficient but whether or not pressure is developed will depend on the particular construction of the Provision is then made for the travel of the elongated usually called a to be effected by a suitably dimensioned and constructed resilient biasing generally a spring after the heat developed by the burning of the charge has caused the melting of a metal member arresting the piston against the pressure of the spring means in its first For a better understanding of the Invention and to show how the same may be into reference will now be by way of to the accompanying in Figure 1 shows a longitudinal partly of an actuator according to the invention with directed piston Figure shows a longitudinal partly in of an actuator according to the invention with a outwardly directed piston Figure shows a longitudinal partly in of another actuator according to the invention with an Referring now to the the control element or actuator shown in Figure 1 comprises a small tube containing a pyrotechnic mixture 3 arranged in a sleeve or housing The pyrotechnic mixture can consist for from 30 to by weight of an oxidising such as barium nitrate or lead and from 30 to by weight of a reducing such as a silicon zirconium magnesium allow or or the pyrotechnic mixture may be a known delay At one end the pyrotechnic mixture 3 covered by means of a centrally apertured disc Arranged in the central opening 5 of the disc 4 a charge 6 which is to be fired electrically and which is electrically Connected to conductors 8 and so that the charge will be ignited when a current Arranged between a positive terminal 7 and a flanged rim 10 of the housing 1 is a supporting ring At its other the pyrotechnic mixture 3 covered by a disc which can consist for or alloys of similar melting or in certain circumstances an alloy melting at higher for of more than said disc being secured in its position by a spacer tube 13 and a supporting ring 14 which has a central hole supporting ring 14 is held in the housin 1 by an inwardly flanged end 16 of the housing A piston 17 arranged the spacer tube 13 has a pin on one side and a cylindrical attachment 19 on the other side and is held in its first position by the pressure of a spring the pin 18 of the piston 17 resting on the disc 12 and the step 21 bearing against extends out of the housing 1 through the opening 15 of the supporting ring 14 is intended for the connection of an element whioh is to be actuated but which is not If the ignitio charge 6 is ired by means of a current source which is connected to the conductors 8 and 9 and through ignition of the charge consequently the pyrotechnic mixture which could be replaced by a delay is also and this while generating a comparatively small amount of gas or even completely without gas formation but with sufficient heat then at least that part of the disc 12 which is covering the internal diameter of the small tube 2 will Thereby the together with the pin 18 and extension 19a can yield under the pressure of the and can be displaced axially in the direction of the tube until the piston 17 is resting on the said tube 2 or on remainder of the disc 12 which is disposed on said in which position it safely held by the residual pressure of the spring The control switch or the like in the required manner by the attachment Referrin now to the embodiment of the inven shown in Figure in which the piston is to be moved in an axial direction opposite to that of the Figure practically same parts as in the embodiment of Figure 1 are It is only the arrangement of the piston 17 and the spring 20 which are the piston 17 being constructed and supported with end 22 covering pyrotechnic mixture As the mixture burns the disc 24 is melted by th heat which is whereby the piston 17 with its extension 1 is displaced in the direotion of the arrow under now operative pressure o the spring 20 until the 17 abuts against the supporting ring 14 and is then safely held in this second position by the spring 20 which is held in its first as against the pressure of the spring 20 by a wi e 33 guided through a bore 32 in a stud 34 fixed on the The mixture which can be ignited by the firing element 7 is such after it has been as it burns the wire 33 is melted through at its ends adjacent the mixture As the spring 20 can then eject the piston 19 which has now been moved into a second said piston bein secured in its forward end position by th remaining residual pressure o the spring insufficientOCRQuality

Claims

1. ,· An actuating element comprising an. elongated member capable of being axiall moved in a housing, a combustible charge and means for ignitin . he combustible charge, the elongated member being retained in a first, position against the action of a resilient member b a metal member located between the combustible charge and the elongated member, the arrangement being such that, in use, ignition of the combustible charge results in generation of heat which melts the metal member and releases the elongated member from its first position and allows it to move j»o a second position in which the resilient member acts on the elongated member to retain it in the second position.

2. , An element according to Claim 1, wherein the means for igniting the combustible charge is an electrically operated igniting means.

3. · An element according to Claim 1 or 2, wherein the combustible charge is a pyrotechnic mixture or a delay charge.

4. » An element according to any preceding claim wherein the metal member is made of Wood's metal.

5. An element according to any one of Claims 1 to 4, wherein the resilient biasin means is a spring.

6. An actuating element in accordance with Claim 1, substantially as hereinbefore described with reference to, and as shown in, Figure 1, 2 or 3 of the accompanying drawings. For the Applicants