U.S. patent number 3,875,845 [Application Number 05/430,603] was granted by the patent office on 1975-04-08 for automatic firearm construction.
This patent grant is currently assigned to Industrie-Werke Karlsruhe-Augsburg Aktiengesellschaft. Invention is credited to Gerhardt Hupp, Helmut Mader.
United States Patent |
3,875,845 |
Hupp , et al. |
April 8, 1975 |
Automatic firearm construction
Abstract
An automatic firearm, particularly a gas operated weapon,
comprises a cartridge feeding system which operates upon movement
of a reciprocating breech block to feed a series of cartridges in
succession to the cartridge chamber of the gun barrel under the
control of gas pressure which is generated during the firing of
each cartridge. A cartridge feeding device for the gun includes a
multi-operable cartridge magazine which has a plurality of
rotatable stars arranged at transversely spaced locations and which
may be shifted selectively into operative positions in which a
rotatable shaft portion becomes automatically coupled to a coupling
and indexing mechanism which is carried on the gun. The coupling
and indexing mechanism comprises a rotary portion which is rotated
upon movement of a piston member which is connected during the
firing to the pressure gases so that it is shifted to effect
rotation of the coupling. The coupling is connected to the shaft of
the indexing star which is in the operative position so that the
cartridges of this portion are fed in succession to the cartridge
chamber of the gun barrel. The construction permits shifting from
one rotatable cartridge supplying star system to another or to a
system in which the cartridges are fed either by the rotatable star
or by a magazine clip which feeds the cartridges directly
downwardly to a position in which they are moved to the cartridge
chamber.
Inventors: |
Hupp; Gerhardt (Oberndorf,
Neckar, DT), Mader; Helmut (Schramberg,
DT) |
Assignee: |
Industrie-Werke Karlsruhe-Augsburg
Aktiengesellschaft (Karlsruhe, DT)
|
Family
ID: |
5870092 |
Appl.
No.: |
05/430,603 |
Filed: |
January 4, 1974 |
Foreign Application Priority Data
|
|
|
|
|
Jan 27, 1973 [DT] |
|
|
2303953 |
|
Current U.S.
Class: |
89/33.04;
89/33.25 |
Current CPC
Class: |
F41A
9/37 (20130101); F41A 9/30 (20130101) |
Current International
Class: |
F41A
9/37 (20060101); F41A 9/00 (20060101); F41A
9/30 (20060101); F41d 009/02 () |
Field of
Search: |
;89/33BA,33BC,33CA,33SF |
Foreign Patent Documents
Primary Examiner: Bentley; Stephen C.
Attorney, Agent or Firm: McGlew and Tuttle
Claims
What is claimed is:
1. An automatic firearm, particularly a gas-operated firearm having
a reciprocating breech block and a cartridge feeding device which
is controlled by the gas pressure during the firing of a cartridge
to feed a series of cartridges in succession to the cartridge
chamber of a gun barrel, comprising a coupling and indexing
mechanism including a member shiftable by gas pressure generated by
the firing of a cartridge and a rotatable coupling part connected
to said member and rotated thereby, a cartridge feeding device
including a transversely movable housing with first and second
transversely spaced rotatable cartridge feeding stars which are
rotatable to feed cartridges in succession to the barrel cartridge
chamber, said cartridge feeding device being shiftable to align a
respective one of said first and second stars in operative
positions in respect to said rotatable coupling and the cartridge
chamber, said stars being selectively and alternatively alignable
in an operative position and each star having a shaft with a
coupling portion which is separately engageable with said rotatable
coupling when in an operative position whereby to connect the
associated star so as to feed the ammunition to the cartridge
chamber.
2. An automatic firearm, according to claim 1, wherein said
coupling and indexing mechanism includes a cylinder, said member
comprising a piston shiftable in said cylinder, means for
connecting gas pressure generated in the gun barrel cartridge
chamber during the firing of a cartridge to said cylinder to
displace said piston, said piston being connected to rotate said
rotatable coupling.
3. An automatic firearm, according to claim 2, wherein said piston
includes a rack portion, said rotatable coupling part comprising a
pinion in meshing engagement with said rack portion.
4. An automatic firearm, according to claim 3, wherein each of said
first and second rotatable stars includes a central rotatable shaft
having a shaft coupling formation at its end, said shaft coupling
formation being engageable with said rotatable coupling, said
rotatable coupling comprising first and second rotatable gears
engageable with said rack.
5. An automatic firearm, according to claim 1, wherein said
rotatable stars each include a shaft coupling part having a T-shape
groove.
6. An automatic firearm, according to claim 1, including a bar-type
magazine located between said rotatable stars for receiving a third
type of ammunition and having a downwardly feeding discharge for
the cartridges located between said first and second stars.
Description
FIELD AND BACKGROUND OF THE INVENTION
This invention relates in general to the construction of firearms
and, in particular, to a new and useful firearm which includes a
cartridge feeding system which includes at least two rotatable star
feeding mechanisms for separately feeding cartridges, for example,
from a continuous belt and which may be selectively positioned in
an operative position in which they become coupled to the indexing
mechanism of the gun for feeding the cartridges to the cartridge
chamber for firing.
DESCRIPTION OF THE PRIOR ART
In action, particularly with heavy rapid-fire weapons, such as
automatic 20 to 30 mm guns for explosive projectiles having a high
initial velocity, it is frequently necessary to attack in immediate
succession living targets with highly explosive shells and armored
targets with armor-piercing shells. To effect this ammunition
change in conventional weapons, the entire cartridge belt must be
removed in a complicated and time-consuming manner and replaced by
another with the desired ammunition.
To remedy this shortcoming, devices are known which permit feeding
of one sort of cartridge by means of belts and another by means of
attachable magazines. Such devices, however, have a limited storing
capacity for the second sort of ammunition, for example,
armor-piercing ammunition.
There is further known a weapon (Stoner) which is equipped with two
separate feeding mechanisms mounted on the left and right-hand
sides and adapted to introduce belts with different sorts of
ammunition, for example, cartridges with explosive projectiles and
cartridges with armor-piercing projectiles. In this construction,
both feeding mechanisms are mounted on a common base, which is
pivotable in respect to the weapon housing to such an extent that
the forwarding breech block seizes either cartridges coming from
the left, for example, with armor-piercing projectiles, or
cartridges coming from the right with explosive shells. Even
though, in this case, a selective firing of two different sorts of
ammunition is possible without changing the belt, the construction
is too expensive and complicated. Another drawback of this
construction is that the second sort of ammunition, contrary to the
intended tactical purpose, does not become effective immediately
after the switching over of the cartridge feeding mechanism because
one cartridge of the other sort of ammunition is fed in before the
switching is still in the barrel and must be fired first. In
action, this is highly undesirable, if only because thereby, for
example, when using tracer ammunition or the like, one' s own
emplacement or location may be betrayed to the enemy.
The present invention is directed to the problem of eliminating
such drawbacks and disadvantages of the known weapons and of
providing a cartridge feeding device permitting the switching over
from one sort of ammunition to another within a minimum of time and
with relatively small forces and assures that after the switching
operation, the following first shot is done with the desired or
required other ammunition.
SUMMARY OF THE INVENTION
In accordance with the present invention, this problem is solved
substantially by providing a cartridge feeding device comprising
two parts of approximately identical mirror opposite design serving
to receive different sorts of ammunition and positioned parallel to
the longitudinal axis of the weapon, the switching over from one
sort of ammunition to the other being effected by shifting the
device transversely to the longitudinal axis of the weapon,
whereby, with the aid of a mechanism associated thereto, the device
is automatically coupled to, or uncoupled from, a mechanism which
is mounted in front of the cartridge feeding device in the
direction of the muzzle and which, under the action of the gas
pressure supplied thereto during the backward motion of the breech
block and while coupled to the respective selected part of the
cartridge feeding device, effects the transfer of the cartridge
received in the feeding belt into the cartridge chamber of the
weapon.
According to a development of the invention idea, the mechanism
mounted in front of the cartridge feeding device in the direction
of the muzzle includes a piston subjected to gas pressure and
comprising a rack portion or the like permanently meshing with a
pinion. To assure the operation of the mechanism in accordance with
the invention and thereby the switching from one sort of ammunition
to the other, the pinion meshing with the rack is permanently in
gear with a second pinion. Both of the pinions in mesh with each
other are provided with simple coupling means which are highly
reliable in operation and each serve to be coupled to, or uncoupled
from, a selected one of axially movable and conformably designed
shafts forming a part of the cartridge feeding device. The coupling
means on the pinions comprise T-shaped grooves with which the
conformably designed shafts may be engaged or from which they may
be disengaged by shifting, in order to change the sort of
ammunition.
By an appropriate application of the main idea of the invention,
the possibility is given, of course, to provide a firing of more
than two different sorts of ammunition in the same simple manner.
This can be achieved, in accordance with the invention, by
providing a bar-type magazine or the like mounted between the
approximately reflex-designed halves of the cartridge feeding
device.
The present invention offers many advantages which cannot be
disregarded:
The switching over from one sort of ammunition to another is
carried out with relatively simple but highly effective and rugged
means. This is an indispensable condition for assuring the
operation of the weapon in action, even under extremely difficult
circumstances.
Aside from the fact that by using the inventive arrangement it is
easily possible to provide for the firing of even a third sort of
ammunition, the feeding of the cartridge belt is independent of the
breech block and effected by the gas pressure acting on a special
piston which, for space-saving and other similar reasons, is also
in the form of a rack.
The highly space saving and narrow construction of the cartridge
feeding device, in accordance with the invention, is of particular
importance. This is possible due to the arrangement whereby the
cartridge to be introduced into the cartridge chamber is delivered
to an offset position relative to the longitudinal axis of the
weapon. Not less important is the advantage that after the
switching over from one sort of ammunition to the other, the very
next fired cartridge is already of the selected new sort of
ammunition.
Accordingly, it is an object of the invention to provide a firearm
construction which includes a coupling and indexing mechanism which
is operated upon the firing of each cartridge and which has a
rotatable coupling part which is selectively coupled to one of a
plurality of separate cartridge feeding stars or indexing
mechanisms of a cartridge feeding system which includes two or more
transversely oriented cartridge feeding systems which may be
selectively placed in an operative position.
A further object of the invention is to provide a weapon which is
simple in design, rugged in construction and economical to
manufacture.
For an understanding of the principles of the invention, reference
is made to the following description of typical embodiments thereof
as illustrated in the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the Drawings:
FIG. 1 is a partial vertical sectional view of a firearm having a
cartridge feeding device constructed in accordance with the
invention:
FIG. 2 is a top view of the firearm shown in FIG. 1;
FIG. 3 is a section taken along the line B--B of FIG. 1;
FIG. 4 is a section taken along the line C--C of FIG. 2; and
FIG. 5 is a view similar to FIG. 4 of another embodiment of the
invention.
GENERAL DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings in particular, the invention embodied
therein in FIGS. 1 to 4, comprises a firearm having a barrel 50
with a bore axis 1.
In accordance with the invention, the weapon is provided with a
cartridge feeding device, generally designated 2, which as best
indicated in FIG. 4 contains two separately operable cartridge
feeding mechanisms or cartridge feeding stars 4 and 4' which are
adapted to be connected through a coupling and indexing mechanism,
generally designated 8, to provide for a selective feeding of
cartridges from a continuous supply or belt 15 or a continuous
supply or belt 15'.
As shown in FIG. 1, the feeding device 2 is constructed to receive
and feed a series of cartridges 3 by the rotation of a feeding star
4 into a cartridge chamber 5. The cartridge feeding mechanism 2 is
held in position over the rifle barrel 50 by a bolt 6 which is
hinged to an eye 2a of the cartridge feeding device 2 and engages
into a stationary eye 7 which is mounted on the combination
coupling and indexing device 8. Suitable means on the eye 7 are
provided for clamping the bolt 6 in a fixed axial position.
In accordance with a feature of the invention, the operating star
mechanism 4 and the operating star mechanism 4' each include an
axially movable shaft 2b which has a coupling part or T-shaped
coupling portion 2c at its end which is adapted to be coupled
selectively to the coupling and indexing means 8 in accordance with
which of the feeding stars 4 or 4' is to operable. For this
purpose, the coupling and indexing mechanism 8 includes coupling
elements 8a and 8b which are under the biasing influence of a
torsion spring 9 to urge them into a position in which they are
engageable with the couplings 8a or 8b of the shaft 2b or 2b' of
the respective star mechanism 4 and 4'. The coupling means and the
spring 9 are mounted in bushings 8c and 8d and the outer
circumferences of the bushings 8c and 8d are provided with teeth 8e
and 8f, respectively, so that they form pinions which are
engageable with a piston rack member 11, as shown in FIG. 3. The
coupling and indexing mechanism 8 is fixed to the top of the stock
52 of the weapon so that it overlies the barrel 50 in the vicinity
of the cartridge chamber 5. The cartridge feeding device 2 is
shiftable transversely to the longitudinal axis of the weapon as
indicated by the double arrow in FIG. 2. A guide pin 10 is mounted
in the eyes 2d arranged at each end of the feeding device and it is
slidably guided in a sleeve 8g which is affixed to the coupling
mechanism 8. The sliding motion takes place when the cartridge
feeding device 2 is shifted transversely in order to change from
one type of ammunition to another.
The coupling and indexing mechanism 8 includes a piston 11 which is
slidable in a housing portion 8a of the coupling and indexing
mechanism transverse to the main axis or bore axis 1. The piston 11
is shaped as a rack 11a and this rack portion meshes with the teeth
of a pinion 8e which is also in meshing engagement with a pinion
8f. The pinion 8e and 8f are provided with coupling parts 8a and 8b
which engage with the T-shaped coupling parts 2c of the shaft 2b or
2b'.
During operation of the weapon a breech block, which is not shown,
moves backwardly after the firing of each cartridge. The firing of
the cartridge produces a pressurization of the cylinder 8h
containing the piston 11 due to flow of the gases through passages
12, 13 and 14, so that the piston 11 moves to the right, as
indicated in FIG. 3. This shifting of the piston 11 produces a
rotary movement of a coupling part through the pinions 8e and 8f so
that the shaft 2b which is coupled thereto is rotated also. This
rotation of the shaft 2b provides a rotation of the feeding star 4
so that the cartridges 3 which are contained in a belt 15 are
advanced to a position in which they are deposited into the barrel
chamber 5. In the position of the cartridge feeding device 2 shown
in FIG. 4, the belt 15 is in an operating position in which it is
being moved by the star 4. When the cartridge type is to be
changed, the cartridge feeding mechanism 2 is shifted to the left
or the dotted line position shown so that the star 4' is moved into
an operative position. The cartridge 3, which is transported by the
feeding star 4, shown in the solid position of FIG. 4, is moved
downwardly in the direction of the black arrow 54 until it is
positioned close to the inlet opening leading to the cartridge
chamber 5, as shown in FIG. 1. In order to obtain the smallest
possible shifting distance of the cartridge feeding device 2, the
central axis of the feeding star in the final or operative position
is located laterally offset with respect to the central axis of the
weapon and by an amount equal to the distance y. Thus, the delivery
of the cartridge 3 into the cartridge chamber 5 takes place in a
position within the feeding star 4 corresponding to an angular
deviation by the amount of the angle .alpha. shown in FIG. 4.
Consequently, if the axis-to-axis distance of the two feeding stars
4 in x, as shown in FIG. 4, the transverse shifting distance of the
cartridge feeding device is a distance equal to x minus the
distance 2y. The cartridge 3 to be introduced into the cartridge
chamber 5, as shown in FIG. 1, performs because of its offset
position by the angle .alpha. a lateral and simultaneously downward
movement. By such an arrangement, it is possible to shorten the
distance in which the feeding mechanism 2 need be shifted and, in
addition, this shortens the time required for a changeover from one
type of ammunition to another.
While the belt is being fed in the direction of the arrow 54 into
the cartridge chamber, the empty belt is moved off in a direction
of the white arrow 56. The angle .beta. indicates the possible
range in which the belt 15 may be removed either in a direction
directly upwardly or in a direction substantially horizontally.
When the center line of the cartridge feeding device 2 is
vertically aligned with the central axis of the weapon, the
position of the device is a neutral position and the cartridges 3
cannot be delivered into the cartridge chamber 5 either from the
left or from the right-hand side. In consequence, this intermediate
neutral position of the cartridge feeding device 2 provides an
additional safety measure in respect to the use of the weapon.
The construction and operation of the cartridge feeding mechanism
indicated in FIG. 5, and generally designated 2', is substantially
the same as that shown in FIG. 4 but in addition to the two feeding
stars 4a and 4a', there is provided a bar-type magazine feed 16
which is mounted between housings of the stars 4a and 4a'.
Ammunition 17 placed in the magazine 16 may be, for example, a type
of ammunition referred to as indicator ammunition, and this may be
used selectively between the firing of one magazine portion or the
other for purposes of marking a target.
While specific embodiments of the invention have been shown and
described in detail to illustrate the application of the principles
of the invention, it will be understood that the invention may be
embodied otherwise without departing from such principles.
* * * * *