IL28460A - Propellant cartridge for use in explosive-powered working tools - Google Patents

Description

Propellant cartridge for use in powered working NOBEL The invention relates propellant cartridges for use in tools such as bolt setting tools for stunning animals to be and the For the efficient use of propellant cartridges for the purposes referred to neither the quick reloading of the tool nor its functio must be impaired by Experience has show that the cartridges used hitherto do or not fulfil this requirement because owing to the high pressure produced by these there frequently splintering and breaking of cartridge and fragments are left in cartridge chamber of the Various attempts have been made in order to Overcome this for by providing preformed breaking zones in the cartridge but they have hot been The invention has the object to avoid these drawbacks and in addition to do away with the cartridge case in order to reduce the weight the cartridge and save the costs of the the invention consists in a propellant cartridge suitable for use in working tools and consisting of a cylindrical body formed o a cast or propellant which body has a uniform diameter throughout and has a single recess extending over part or the whole of the height of the the cartridge comprising an powder charge which contained in the in shape of a loose powder or or forms part a powder foil covering the recess at its open or at either open Although caeeless cartridges have already been proposed in connection with safety reasons have so far operated againet the omission of the of cartridges for power especially in view of the danger of unintentional danger is avoided in the design of the cartridge according to the since the cartridge does not itself comprise an abutment whioh is necessary for the and even if such an abutment ignition can take place only by impact on the powde and this requires an appropriately disposed impact tool designed to penetrate into the Where powder foils are provided they are preferably glued to the end faces of the powder In an advantageous embodiment of the invention the recess is positioned in the axis of the cylindrical The embodiment of the invention in which the recess does not extend over the entire height of the body but only through part thereof can be used with especial advantage in those cases where the propellant powder is The design with recess is suitable for both castable and other types of propella the body of propellant powder has the form of a flat tablet or Even where the recess is not the necessity of orientating the propellant cartridge in the tool is avoided if the powder foil covering recess is If the body of propellant powder has the shape of a the necessity orientating the cartridge is avoided if both powder foils are impact powder ma consist wholly of Ignitable or they may consist propellant powder and be coated on their inner the one turned towards the with a layer of In order to make sure that ignition and intensify the combustion of the propellant the recess may contain an preferably in of a loose powder or of Such a charge is where the foils are wholly or in of but the charge within the recess is indispensable where the powder foils are made from conventional propellant powder which is not There exists a great freedom of choice for the seleotion of the appropriate propellant powders fo making cartridge body and the For the body there may be for pure nitrocellulose This should be a porous In addition to a great surface which makes for good such powder has in particular the advantage that it can be compressed into a bod at relatively low pressure without closure of its For a powder used in a case where no additional charge of ignitable powder is the only requirement is that the powder of which the foil consists is reliably ignitable by Suitable powders for use in the powder foils as a charge in the recess for tetrazene and tetrazene Substantially no limitations exist regarding the shape and dimensions of the body of propellant powder and the 6 In particular it will readily understood that the bottom foil 2 can be replaced by an integral bottom of th body that body 1 will that case have of a cup instead of a Such cup can conveniently be produced by insufficientOCRQuality

Claims (5)

1. CLAIMS lo A cashless propellant cartridge suitable for use in explosion-powered working tools and consisting of 'a cylindrical body formed of a cast or moulded, impact-insensitive propellant powder, which "body has a uniform diameter throughout and has a single recess extending over part or the whole of the height of the body, the cartridge comprising an impact-Ignj able powder charge which is contained in the recess, e*gl in the shape of a loose powder or flakes, and/or constitutes, or forms part of, a powder foil covering the recess at its open end, or a either open end.

2. , A cartridge according to Claim 1, wherein the recess is positioned in the axis of the body.

3., A cartridge according to Claims 1 or 2, wherein the bod has the form of a flat tablet or ring,

4. A cartridge according to Claims 1, 2 or 3» wherein the impact-dgnitable powder of the powder foil or foils, or within the recess, is tetrazene or tetrazene trizinate.

5. Caseless propellant cartridges suitable for use in explosion-powered tools, substantially as described herein. For the Applicants BR,. REIMOLD OQHN AMD PAMJSERS RC:CB