U.S. patent application number 10/399795 was filed with the patent office on 2004-01-22 for plastic cartridge case and device for the production thereof.
Invention is credited to Eduardovich, Khvichia David, Eduardovich, Khvichia Georgy, Khvichia, Eduard Illarionovich.
Application Number | 20040011237 10/399795 |
Document ID | / |
Family ID | 20249609 |
Filed Date | 2004-01-22 |
United States Patent
Application |
20040011237 |
Kind Code |
A1 |
Khvichia, Eduard Illarionovich ;
et al. |
January 22, 2004 |
Plastic cartridge case and device for the production thereof
Abstract
The present invention generally relates to small arms technology
and more particularly, is concerned with hunting and sporting
cartridges having plastic cases. The objective of the invention is
increasing of the ballistic data and structural strength of the
product with low price of its manufacturing. This problem is solved
by supplying of the plastic cartridge case in the shape of
thin-walled cup of cylindrical external surface and internal
surface comprising three conical portions of length and taper
increasing from the bottom having the opening for the primer with a
dam-diaphragm separating the cartridge case part and the part for
the primer installation. The dam-diaphragm thickness is selected
within the range of 0,2-0,5 mm. The device for manufacturing of the
plastic cartridge case contains a mold performed of a matrix
forming the external surface of the cartridge case, a halfmatrix
with conical casting opening which forms the cup bottom and a punch
forming the internal surface of the cartridge case. On the
halfmatrix is a cylindrical hollow pin forming a closed primer
opening. The cylindrical hollow pin together with the punch form a
ring sprue.
Inventors: |
Khvichia, Eduard Illarionovich;
(Moscovskaya obl, RU) ; Eduardovich, Khvichia David;
(Moscovskaya obl, RU) ; Eduardovich, Khvichia Georgy;
(Tbilisi, GE) |
Correspondence
Address: |
FRISHAUF, HOLTZ, GOODMAN & CHICK, PC
767 THIRD AVENUE
25TH FLOOR
NEW YORK
NY
10017-2023
US
|
Family ID: |
20249609 |
Appl. No.: |
10/399795 |
Filed: |
April 21, 2003 |
PCT Filed: |
May 15, 2002 |
PCT NO: |
PCT/RU02/00232 |
Current U.S.
Class: |
102/466 |
Current CPC
Class: |
F42B 7/06 20130101; F42B
5/30 20130101 |
Class at
Publication: |
102/466 |
International
Class: |
F42B 005/30 |
Foreign Application Data
Date |
Code |
Application Number |
May 17, 2001 |
RU |
2001113116 |
Claims
1. A plastic cartridge case, performed in a shape of a thin-walled
cup having a cylindrical external surface and an internal surface
performed of three conical portions of length and a taper
increasing from a bottom with an opening for a primer,
characterized that comprising a dam-diaphragm of 0,2-0,5 mm
thickness separating a cartridge case part and a part for the
primer installation.
2. A device for a plastic cartridge case manufacturing, comprising
a mold performed of a matrix forming an external surface of the
cartridge case, a half matrix with a conical casting opening which
forms a cup bottom and a punch forming an internal surface of
cartridge case, characterized that a hollow pin is carried out on
the half matrix, forming a closed primer opening and, together with
the punch forming a ring sprue.
Description
[0001] The present invention generally relates to small arms
technology and, more particularly, is concerned with hunting and
sporting cartridges with plastic cases.
[0002] There are known plastic cases for sporting and hunting
cartridges in the shape of thin-walled cup of cylindrical external
surface and with opening at the bottom for primer (Patent UK
1161422, F 42B 5/30, published in 1969).
[0003] Known from this source device for manufacturing of plastic
cartridge case composes of a mold and a distribution block with
casting openings.
[0004] The main drawback of the existing case is its low structural
strength--the case breaks down during shooting. Internal surface
geometry of the case and its processing technique do not provide
structural strength because of casting defects.
[0005] These defects are not peculiar to the existing plastic
cartridge case with internal surface comprising three conical
portions of length and taper increasing from the bottom
(Certificate for useful model RU 11882, F 42 B 5/30, 1999--closest
analog). The device for manufacturing of the case is described in
this source.
[0006] The drawback of the existing case is penetration of powder
corpuscles into the primer during the filling of the cartridge
resulting in failure of ignition and cartridge parameters
spread.
[0007] The drawback of the device for manufacturing of the case is
that the cylindrical pin is arranged on the punch what leads to
declination from axis during the casting of matrix by working mass
resulting in the case geometry failure and reduction of structural
strength.
[0008] The objective of the invention is increasing of the
ballistic data and structural strength of the product with low
price of its manufacturing.
[0009] This problem is solved by additional supplying of the
plastic cartridge case in the shape of thin-walled cup of
cylindrical external surface and internal surface comprising three
conical portions of length and taper increasing from the bottom
having the opening for the primer with a dam-diaphragm separating
the cartridge case part and the part for the primer installation.
The dam-diaphragm thickness is selected within the range of 0,2-0,5
mm.
[0010] The device for manufacturing of the plastic cartridge case
contains a mold performed of a matrix forming the external surface
of the cartridge case, a halfmatrix with a conical casting opening
which forms the cup bottom and a punch forming the internal surface
of the cartridge case. On the halfmatrix is a cylindrical hollow
pin forming a closed primer opening. The cylindrical hollow pin
together with punch form a ring sprue.
[0011] The longitudinal section of the cartridge case is shown on
picture 1 and section of the device for manufacturing of the
plastic cartridge case is shown on picture 2.
[0012] The cartridge case is shaped as the cup 1 with internal
surface 2 comprising three conical portions.
[0013] At the bottom 3 is the primer opening 4. Inside of the cup
(around the opening 4) there is a compensation groove 5. A recess 6
performed concentrically with the opening 4 on the outside surface
of the bottom 3.
[0014] The cup (cartridge case) part and part for the primer
installation is divided by the dam-diaphragm 7.
[0015] The device for manufacturing of the plastic cartridge case
consists of the matrix 8, the halfmatrix 9 and the punch 10. Made
on the halfmatrix the cylindrical hollow pin 11 forms the closed
primer opening. The ring sprue 12 is between the surface of the pin
11 and the surface of the punch 10.
[0016] The manufacturing process of the cartridge case is as
follows:
[0017] The plastic mass is supplied from the distribution block
(not shown on the picture) into the cylindrical opening of the
halfmatrix 9, then through the pin 11 and the ring sprue 12
penetrates into the mold filling full its space uniformly excluding
appearance of defects. After taking the finished cartridge case out
of the mold, unnecessary part of pour is removed leaving the dam
between the parts of the cartridge case.
[0018] The cartridge case manufactured according to this method has
the following advantages.
[0019] The cartridge case has improved structural strength
characteristics. Division of the cartridge case parts: the primer
part and the combustion part results in improvement of ballistic
characteristics of the cartridge case due to exclusion of powder
charge effect on burning intensity of the primer and ignition
process improvement.
[0020] Proceeding from the tests the thickness of the dam-diaphragm
should be selected within the range of 0,2-0,5 mm. The described
cartridge case has improved structural strength characteristics,
low manufacturing price, shorter range of spread of filled
cartridge parameters of powder charge pressure and shot speed.
* * * * *