US3279373A

US3279373A - Cartridge case

Info

Publication number: US3279373A
Application number: US423474A
Authority: US
Inventors: Stadler Hans; Gawlick Heinz; Stahlmann Rudolf
Original assignee: Dynamit Nobel AG
Current assignee: Dynamit Nobel AG
Priority date: 1964-01-08
Filing date: 1965-01-05
Publication date: 1966-10-18
Anticipated expiration: 1983-10-18
Also published as: NL6500147A; SE312743B; GB1097931A; FI43397B; DE1283122B; FI43397C; AT265072B; DK112641B; IL22676A

Description

Get. 18, 1966 H. STADLER ETAL CARTRIDGE CASE Filed Jan. 5, 1965 FIG. 3

INVE STADL NTORS. H ER H GAWLICK RUDOLF STAHLMANN 8 ATTORNEzS.

United States Patent 3,279,373 CARTRIDGE CASE Hans Stadler, Nurnberg, and Heinz Gawlick and Rudolf Stahlmann, Furth, Bavaria, Germany, assignors to Dynamit Nobel Aktiengesellschaft, Troisdorf, Germany Filed Jan. 5, 1965, Ser. No. 423,474 Claims priority, applicationsgermany, Jan. 8, 1964,

4 9 8 Claims. (Cl. 102-44) The present invention relates to cartridge constructions and more particularly to cartridges for mortars of plastic material and made in one piece.

It has already been proposed in the prior art to manufacture in one piece of plastic material the fired cartridges for mortars in such a manner that a plastic case open in the forward end is moded in one piece with a bottom piece. The case is then closed after filling with the propellent charge by a thin plate of plastic material placed thereon which, by fi-anging over, is secured or welded to the case. This flanging operation entails certain difliculties which are to be avoided by the present invention.

The fired cartridge for mortars according to the present invention essentially consists of a plastic case made in one piece with a closure plate at the front end face thereof and 10f a strong bottom piece also made of plastic material and receiving the primer or fuse which is formslockingly connected with the case.

In a special construction according to the present invention, the bottom piece is provided with annular beads and the case with annular ribs in the direction toward the open end which upon emplacement of the case over the bottom piece snap-in between the annular beads thereof.

With fired cartridges for mortars it is important that the cartridge is seated so firmly in the chamber of the shell receiving the same that it does not fall out of thte same and also does not stay behind in the mortar after the firing. With the cartridge according to the present invention this requirement may be fulfilled in a simple manner in that an outwardly projecting, elastic annular bead is formed into the bottom piece which is elastically deformed upon insertion of the cartridge into the shell and produces a good clamping seat. The same effect can be achieved by a corresponding annular bead at the case. Possibly such a yielding or elastic annular bear may be formed into both the bottom piece as well as the case.

It is appropriate to construct the annular beads in the form of elastic collars. If both the bottom piece as well as the cartridge case receive such a collar, then the collar is appropriately formed at the case in such a manner that it extends over the bottom piece along the upper rim thereof. If the cartridge is inserted, then the collar of the case exerts a radial pressure which compresses the connecting place between the case and bottom piece and thereby increases the rigidity of the connection.

Accordingly, it is an object of the present invention to provide a cartridge for mortars made of plastic material which avoids, by simple means, the aforementioned shlortcomings encountered with the prior art constructions.

It is another object of the present invention to provide a fired cartridge for mortars essentially consisting of plastic material which can be readily manufactured without involving cumbersome and diflicult-to-realize operating steps.

A further object of the present invention resides in the provision of a cartridge for mortars which is so constructed, notwithstanding the use of plastic material, that it is rigidly seated in the shell or grenade to prevent the cartridge from falling out of the shell or from remaining behind in the mortar chamber after the firing.

A further object of the present invention resides in the Patented Oct. 18, 1966 provision of a cartridge made of plastic material which is so constructed that it is elastically deformed upon assembly into the shell thus producing a good wedging and clamping seat.

Still another object of the present invention resides in the provision of a plastic cartridge for mortar shells intended to be fired with the mortar shell which increases the rigidity of the connection between the cartridge and the shell.

These and further objects, features, and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawing which shows, for purposes of illustration only, several embodiments in accordance with the present invention and wherein:

FIGURE 1 is an axial cross-sectional view through a fired cartridge in accordance with the present invention and more particularly showing the bottom piece and the case as still separate parts,

FIGURE 2 is a cross-sectional view of a cartridge in accordance with the present invention of slightly modified construction from that of FIGURE 1, with the case and bottom piece connected together;

FIGURE 3 is a partial cross-sectional view, on an enlarged scale, showing a special construction of the case for a cartridge in accordance with the present invention, and

FIGURE 4 is a special construction of the bottom piece for a cartridge in accordance with the present invention provided with a case according to FIGURE 3.

Referring now to the drawing wherein like reference numerals are used throughout the various views to designate like parts, the cartridge of the present invention is composed of a case 1 and of a bottom piece 2 which are both made of plastic material of known conventional type. The case 1 is according to the present invention closed at the upper end face thereof by a thin plate 3 of plastic material which is made in one piece with the case 1 so that the operating step of flanging necessary heretofore is obviated for securing the inserted disc of the prior art. The bottom piece 2 is relatively thick and accommodates the primer or fuse 4. The bottom piece 2 is provided in the illustrated embodiment with annular heads 5 whereas annular ribs 6 are formed into the case 1 which upon assembly of the two parts 1 and 2 snap elastically into the grooves between the annular beads 5 of the bottom piece 2 so that a rigid connection between case 1 and bottom piece 2 is established.

In order to establish a good clamping seat of the cartridge in the bore of the shell, a springy or elastic annular collar 7 is formed into the bottom piece 2, which, as may be recognized from FIGURE 4, abuts under elastic deformation against the bore wall 8 of the shell or grenade alrlid establishes a frictional contact between cartridge and s ell.

FIGURE 2 shows a construction in accordance with the present invention without such collar.

Furthermore, the case 1 may also be provided with -a collar 9 which upon insertion of the cartridge is also deformed.

It is particularly appropriate to so construct the collar 9 (FIGURE 3) of the case 1 that upon insertion of the cartridge, it comes to lie over the upper part of the bottom piece 2 as shown in FIGURE 4. It not only increases then the frictional pressure of the cartridge in .the bore but it simultaneously exerts a radially inwardly directed force which assists the form-locking connection between the case and the bottom piece by an additional force-locking connection.

While we have shown and described several embodiments in accordance with the present invention, it is understood that the same is not limited thereto but is susceptible of numerous changes and modifications as known to a person skilled in the art and we therefore do not wish to be limited to the details shown and described herein but intend to cover all such changes and modifi cations as ,are encompassed by the appended claims.

We claim:

1. A cartridge for mortars comprising:

plastic generally tubular casing means having .an .open end and an integrally formed end closure plate at the other end,

a relatively strong plastic bottom piece closing said open end, means securing said bottom piece to said casing means,

and outwardly projecting elastic annular collar means formed integral with each of the bottom piece and the casing means, the collar on said casing means extending over the bottom piece.

2. A cartridge for mortars comprising:

generally tubular plastic casing means having an open end and an integrally formed end closure plate at the other end,

said bottom piece being provided with annular beads and said casing means with annular ribs which upon emplacement of the casing means over the bottom piece snap into the spaces between the annular beads thereof,

3. A cartridge for insertion within a bore for firing, comprising a generally tubular cartridge case having a closed forward end and an open rearward end; a bottom piece telescopically closing said rearward end, said bottom piece and said cartridge case having outer and inner elesaid outer member to contract for tightly engaging said inner member.

4. The device of claim 3, wherein said elastic means is an annular collar.

5. The device of claim 3, wherein said cartridge case is said outer member, and said elastic means is an annular collar that extends rearwardly beyond the rearward end of said cartridge case to overlap and frictionally engage said bottom piece when said cartridge is inserted into the bore.

6. The device of claim 3, wherein said securing means includes interengaging form-locking means operatively connecting said bottom piece and said cartridge case.

7. The device of claim 6, wherein said elastic means is an annular collar.

8. The device of claim 6, wherein said cartridge case is said outer member, and said elastic means is an annular collar that extends rearwardly beyond the rearward end of said cartridge case to overlap and frictionally engage said bottom piece when said cartridge is inserted into the bore.

References Cited by the Examiner UNITED STATES PATENTS 3,144,827 8/1964 Boutwell 102-43 X FOREIGN PATENTS 1,024,067 1/1953 France.

BENJAMIN A. BORCHELT, Primary Examiner. R. F. STAHL, Assistant Examiner.

Claims

1. A CARTRIDGE FOR MORTARS COMPRISING: PLASTIC GENERALLY TUBULAR CASING MEANS HAVING AN OPEN END AND AN INTEGRALLY FORMED END CLOSURE PLATE AT THE OTHER END, A RELATIVELY STRONG PLASTIC BOTTOM PIECE CLOSING SAID OPEN END, MEANS SECURING SAID BOTTOM PIECE TO SAID CASING MEANS, AND OUTWARDLY PROJECTING ELASTIC ANNULAR COLLAR MEANS FORMED INTEGRAL WITH EACH OF THE BOTTOM PIECE AND THE CASING MEANS, THE COLLAR ON SAID CASING MEANS EXTENDING OVER THE BOTTOM PIECE.