EP0300112A1 - Ganzkunststoffpatronenhülse und Verfahren und Vorrichtung zu ihrer Herstellung - Google Patents
Ganzkunststoffpatronenhülse und Verfahren und Vorrichtung zu ihrer Herstellung Download PDFInfo
- Publication number
- EP0300112A1 EP0300112A1 EP87850233A EP87850233A EP0300112A1 EP 0300112 A1 EP0300112 A1 EP 0300112A1 EP 87850233 A EP87850233 A EP 87850233A EP 87850233 A EP87850233 A EP 87850233A EP 0300112 A1 EP0300112 A1 EP 0300112A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- case
- mould
- cap
- shaped
- plastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
- F42B5/26—Cartridge cases
- F42B5/30—Cartridge cases of plastics, i.e. the cartridge-case tube is of plastics
- F42B5/307—Cartridge cases of plastics, i.e. the cartridge-case tube is of plastics formed by assembling several elements
- F42B5/313—Cartridge cases of plastics, i.e. the cartridge-case tube is of plastics formed by assembling several elements all elements made of plastics
Definitions
- the present invention relates to a plastic cartridge case of the kind indicated in the generic part of claim 1.
- US patent No. 4,481,885 discloses a plastic cartridge case in which the bottom part is reinforced by means of a metal jacket or cap.
- the case is made of polytethylene which is thermoplastic and easy to process and shape but does not have the sufficient strength, whence a reinforcement is needed.
- US patent No. 4,276,830 it is sought to avoid the corrosion problems associated with the metal reinforcement of the bottom of the case by completely embedding the metal reinforcement in the bottom of the case. Still, this gives a difficult and costly process of manufacture, and this cartridge case has been no success on account of the price.
- thermoplastic materials e.g. polycarbonate that has a greater strength so that a case made entirely of plastic can be manufactured.
- This material is considerably more expensive than polyethylene, and besides it is stiffer so that the forward directed opening of the cartridge cannot in general be closed by a usual star-shaped closure, but a closing plug has to be used which makes the cartridge more expensive.
- the object of the invention is to provide a plastic cartridge case for shot cartridges made entirely of plastic and designed in such a way that the drawbacks of the cases of the prior art are completely avoided without implying the use of materials or methods of manufacture that will make the case more expensive compared to the cases of the prior art.
- thermoplastic materials as specified in the characterising part of claim 3 and may be manufactured of two different kinds of thermoplastic material as indicated in the characterising part of claim 4 so that each of the parts may be seperately optimizied with respect to properties as to strength and with respect to form by a suitable selection of thermoplastic materials.
- a plastic cartridge case can be manufactured totally without metal parts and particular reinforcement parts and still, a case can be obtained that may be closed by means of a usual star-shaped closure and this cartridge case may be reused several times by recharging.
- the plastic cartridge case is designed as indicated in the characterising part of claim 6 it may be used with no problems in weapons having a case ejector in that the ejection rim is then made of a material that can withstand the grasp of the ejector mechanism.
- This very point is a weakness of many of the plastic cartridge cases belonging to the prior art, and they are therefore often provided with a metal cap so that the ejector mechanism does not tear the case to pieces. It has been found that the case according to the present invention is able to withstand even those ejector mechanism constructions that produce the strongest grasp on the bottom part of the case.
- the present invention also relates to a method for the manufacture of a plastic cartridge case made entirely of plastic.
- a method for the manufacture of a plastic cartridge case made entirely of plastic By proceeding as indicated in the characterising part of claim 7, it is possible to manufacture a case in one single work process which reduces the price of manufacture significantly. In addition, no superfluous material is used and thus no waste results.
- the bottom of the case is injection moulded using e.g. polyethylene, and then the cap-shaped part is injection moulded, e.g. of polycarbonate, and only then is the case removed from the mould.
- the manufacturer has all possibilities of a speedy and fully automatic production process and of a process in which the two materials stick together optimally, because the blank is not being cooled too much between the first and the second moulding.
- the present invention also relates to a tool for carrying out the method according to the present invention and as indicated in the characterising part of claim 8.
- a relatively simple tool is obtained having relatively few moving parts and in which the necessary rearrangements of the tool can be carried out during the production process.
- the rearrangement of the tool is preferably carried out according to a pattern of movements as indicated in the characterising part of claim 9.
- merely simple and uncomplicated movements of the parts of the tool have to be carried out.
- Figs. 1 and 2 show a shot cartridge 1 having a plastic cartridge case according to the invention.
- the case consists of a cylindrical, tube-shaped part 2 of uniform wall thickness and having a closure end 4 closed in the manner of a usual star-shaped closure.
- a plate-shaped closure part that is put in place after charging the cartridge.
- the whole case part 2, 10, 10′, 10′′ is made as a unitary body of thermoplastic material, e.g. polyethylene.
- a cap-shaped part 3 having a rim 9 made as a unit manufactured of a thermoplastic material, e.g. polycarbonate.
- This part is closely fastened to the bottom of the case 10, e.g. fused together with the bottom of the case.
- the percussion cap 8 is mounted and secured frictionwise both in the part 10′′ and the part 3 so that a double tightening is obtained so that there is provided a complete tightening as regards the gas pressure from the powder charge 7. This double tightening ensures that no part of the gas pressure can be passed on backwards and reduce the effect of the charge of powder.
- the radially outward directed rim 9 has the usual form so that it can be grasped by the generally known ejector mechanisms for firearms for shot cartridges.
- a cartridge of this kind may be recharged a countless number of times, if so desired, because the cap shaped part 3, 9 gives the case sufficient strength so that it is not destroyed neither during the firing nor during the ejection.
- the cartridge case according to the present invention may be manufactured, e.g. by means of a tool such as the tool shown in figs. 3 and 4 in the drawing.
- Fig. 3 shows the principle of a tool for moulding plastics comprising a mould 11 that can be heated and cooled in the usual way associated with a process for the injection moulding of plastics.
- the mould 11 there are openings in which there has been placed moving mould parts 12 and 17, 20.
- the shape of the mould part 12 is as that of the interior cavity of a cartridge case, but having a nose 13 that can engage a cavity or bottom hole 19 corresponding hereto in the other moving mould part 17.
- the foremost end 14 of the mould part 12 is designed in such a way that it shapes the cylindrical part 10′′ of the bottom of the case and the ribs 10′ and the bottom plate 10.
- the double arrows 22 and 18 show the pattern of movement of the two mould parts.
- the mould part 17 is provided with a ring-shaped, cylindrical part 20 having a projecting ring-shaped part 21.
- the parts 17 and 20 are in general kept together in a fixed position, but can be separated for cleaning, repair and so on.
- the first moulding can be carried out in that the part 2, 10, 10′, 10′′ is moulded using the first moulding material.
- the mould parts and the moulding material have to be heated in the usual manner before the injection moulding, and after the moulding the parts are cooled exactly to the extent that the moulding material solidifies.
- the position of the mould parts are changed to the position shown in fig. 4 as the moving core 17, 20 is pulled downwards and a set of moving jaws 15 that are movable in the directions of the arrows 16, are brought together so that they meet the nose 13.
- a new mould cavity is produced and the cap-shaped part 3, 9 can be injection moulded in a second moulding using a second moulding material that may be the same material as the first material or another material, e.g. polycarbonate.
- the front edge of the mould 21 has been made exactly in such a way that it can close or fill the mould cavity (see fig. 3) at the bottom of the case not to be used in the first moulding.
- the mould parts are cooled in the usual manner, the jaws 15 are pulled back to the position shown in fig. 3 and the mould is opened, and by means of the moving mould part 12 the finished case 1 can be brought out of the mould, completely without waste and without sprues and the like to be removed.
- the mould may be adapted in such a way that many, e.g. 12 or 24, cases per process, are moulded so that a rational production results.
- the materials that are used may be any material being a plastic and also being suited for injection moulding and they may have any desired colour so that different cartridges may have case parts 2 of different colours, but e.g. cap part 3 of the same colour or vice versa.
- the cap part 3 may be manufactured of brass-coloured plastic, e.g. brass-coloured polycarbonate.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK44786A DK44786A (da) | 1986-01-29 | 1986-01-29 | Plastpatronhylster til haglpatroner, fremgangsmaade til fremstilling heraf samt vaerktoej hertil |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0300112A1 true EP0300112A1 (de) | 1989-01-25 |
Family
ID=8093651
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87850233A Withdrawn EP0300112A1 (de) | 1986-01-29 | 1987-07-21 | Ganzkunststoffpatronenhülse und Verfahren und Vorrichtung zu ihrer Herstellung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0300112A1 (de) |
DK (1) | DK44786A (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009135723A1 (en) * | 2008-05-05 | 2009-11-12 | Mario Principi | Cartridge shell for hunting shotguns with monolithic structure made of plastic materials |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2205619A1 (de) * | 1971-02-09 | 1972-08-31 | Lefebvre, Pierre Albert, SiHe Le Guillaume, GMT S A , Le Mans, Sarthe (Frankreich) | Patronenhülse aus Kunststoff |
FR2287324A1 (fr) * | 1974-10-07 | 1976-05-07 | Philippe Josette | Procede de fabrication d'une cartouche de chasse |
FR2317622A1 (fr) * | 1975-07-10 | 1977-02-04 | Philippe Josette | Douille de cartouche de chasse, moules et presse pour sa realisation |
US4569288A (en) * | 1983-07-05 | 1986-02-11 | Olin Corporation | Plastic cartridge case |
-
1986
- 1986-01-29 DK DK44786A patent/DK44786A/da not_active Application Discontinuation
-
1987
- 1987-07-21 EP EP87850233A patent/EP0300112A1/de not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2205619A1 (de) * | 1971-02-09 | 1972-08-31 | Lefebvre, Pierre Albert, SiHe Le Guillaume, GMT S A , Le Mans, Sarthe (Frankreich) | Patronenhülse aus Kunststoff |
FR2287324A1 (fr) * | 1974-10-07 | 1976-05-07 | Philippe Josette | Procede de fabrication d'une cartouche de chasse |
FR2317622A1 (fr) * | 1975-07-10 | 1977-02-04 | Philippe Josette | Douille de cartouche de chasse, moules et presse pour sa realisation |
US4569288A (en) * | 1983-07-05 | 1986-02-11 | Olin Corporation | Plastic cartridge case |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009135723A1 (en) * | 2008-05-05 | 2009-11-12 | Mario Principi | Cartridge shell for hunting shotguns with monolithic structure made of plastic materials |
Also Published As
Publication number | Publication date |
---|---|
DK44786A (da) | 1987-07-30 |
DK44786D0 (da) | 1986-01-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE ES FR GB IT SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19890726 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: VAGNER, IVAN Inventor name: VASEGAARD, HENNING |