Compressed gas-operated shooting weapon

The invention discloses a compressed gas-operated firearm (1), especially a pistol, which at the utilization of a drum (18) for multi-shot projectile receipt distinguishes itself through a linearly displaceable weapon barrel (3) to achieve a loading position, or, respectively, firing position, and through a trigger (4) which is automatically secured against actuation in the loading position. Furthermore, a new type of valve system (25) is proposed for the impulse-like emission of the compressed gas upon the discharge of a shot.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The present invention relates to a compressed gas-operated firearm, 
particularly a pistol. 
2. Discussion of the Prior Art 
A firearm of that type is known from the disclosure of U.S. Pat. No. 
5,160,795. This known firearm possesses a frame on which there is arranged 
the weapon barrel. Furthermore, there is provided a drum or ammunition 
cylinder for the receipt of projectiles or, respectively, firing bodies, 
which is installed on the barrel arrangement so as to be rotatable about 
its own axis. The axis of rotation of the drum extends in parallel with 
the longitudinal axis of the weapon barrel. The rotational movement and 
the adjustment of the drum is undertaken through the intermediary of a 
lever system which stands in operative connection with the trigger system 
of the firearm. The weapon barrel, together with the drum and the lever 
system is pivotable upwardly through a forward axis out of the frame for 
the assumption of the loading position. In this outwardly pivoted 
position, the drum can be reloaded with new projectiles. 
The pivoting procedure of the barrel arrangement out of the frame is not 
without problems, inasmuch as the arrangements of the lever system and the 
drum which are outwardly swung together therewith, on the one hand, must 
be maintained in a precisely fitted position and, on the other hand, must 
be constructed in such a manner that the outward pivoting of the system 
components from the operative position in which they are linearly oriented 
in the firing position, must be possible without damaging the components 
and without adversely influencing their functioning. As a result, such a 
construction becomes technically complex. Moreover, there must be worried 
the occurrence of losses in gas pressure, which react negatively on the 
firing power of the firearm. 
From the same U.S. Patent Publication No. 5,160,795 and also U.S. Pat. No. 
5,400,536 there is known a valve system for a firearm of that type, which 
is inserted into the frame behind the barrel arrangement. This valve 
system possesses a valve member which is sealed at its end surfaces, and 
which receives a longitudinally movably guided valve shaft. The chamber 
about the valve shaft stands in communication with a compressed gas 
cartridge. The valve shaft possesses a rearward protrusion which is 
contacted by the hammer of the firearm. The forward end surface of the 
valve shaft acts on a spring-supported protrusion which by means of a 
conical contact surface contacts the bore opening of the drum. The valve 
shaft stands under the action of a compression spring and is moved 
forwardly impulse like through the hammer of the firearm upon actuation of 
the trigger from its sealing contact, in view of which there are opened 
passageways for the gas or air pressure. This entire valve arrangement is 
again technically complex due to its large number of interfitted 
components, which is required by the pivoting arrangement of the weapon 
barrel with the inserted drum. 
Through the disclosure of German DE 29 38 600 C2, there has been disclosed 
a firing pin safety for a hand-held firearm or handgun. This handgun is 
constructed as a pistol and possesses a barrel and apparently linearly 
slidable carriage. On the weapon barrel there is pivotably supported a 
trigger in opposition to the force of a spring, which concurrently 
actuates a latching arrangement which engages into the forward traveling 
path of the firing pin. 
Commencing from the above-mentioned state-of-the-art, it is an object of 
the present invention to provide a compressed gas-operated firearm of the 
above mentioned type, which by means of relatively few and technically 
simple assembly and system components affords a secure and simple handling 
and functioning of the firearm. 
SUMMARY OF THE INVENTION 
In accordance with the object of the invention, the significant features 
can be ascertained in that the compressed gas-operated firearm which is 
known from the state of the technology possesses a linearly displaceable 
barrel arrangement so as to be able to come from the firing position into 
the loading position and conversely. Hereby, by means of a further 
essential feature there is ensured that the trigger of the firearm is 
automatically latched in the loading position. As is detailed hereinbelow, 
it has been ascertained in a surprising manner that the linear 
displaceability of the barrel arrangement, and the drum which is 
resultingly releasable from the barrel, lead to simple system components 
and concurrently to a higher firing power at optimum weapon safety. 
The displacement of the weapon barrel into the loading position of the 
firearm is effected through spring force, as soon as the latching lever on 
the breech mechanism of the firearm is manually pivoted into the unlatched 
position. Consequently, there is concurrently drawn the axle out of the 
drum, which is then simply removable for reloading from the weapon frame 
or respectively, breech mechanism. The pulling out of the drum axle now 
causes that the first arm of the double-armed lever swings radially into 
the theoretical center of the axis. As a result thereof, the second arm is 
automatically moved into axial path of movement of the slider, whereby the 
entire trigger system is blocked. 
Inasmuch as the barrel arrangement is linearly displaceable, the sealing of 
the valve system is also relatively simple with regard to the drum. The 
hollow cylindrical valve stem lies with its forward end surface in the 
firing position due to the impulse at the discharge of a shot directly 
sealingly against the facing bore opening of the drum. This is effected in 
a sensible manner through the utilization of the released compressed gas. 
Particular constructive prerequisites for achieving a sealing are not 
necessary at the end surface of the stem.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT 
The compressed gas-operated pistol 1 consists essentially of the breech 
block 2 (also referred to as a frame), the weapon barrel 3 arranged in the 
breech block, the trigger system 4 and the grip member or hand grip 5. The 
forward part 6 of the breech block 2 which receives the weapon barrel 3 is 
linearly axially displaceable from a loading position into a firing 
position and conversely. In the view represented in FIG. 1, the firearm 1 
is in the closed position, which corresponds to the firing position. The 
breech block lever 7 is located in the latched position. A downward 
pivoting of the breech block lever 7 about the axis 8 leads to an 
unlatching, and thereby to the loading position of the firearm 1, in which 
the weapon barrel 3 is slid outwardly with the support of a spring force 
forwardly over the mouth of the barrel 9, as illustrated in FIG. 1. 
The securing of the firearm 1 is effected through a safety lever 10, which 
in the illustrated position brings a firing pin or strikes 11 into the 
line of action between the hammer or cock 12 and the stem 13 (in FIG. 6: 
bolt 57) or, respectively, the valve stem 55 towards the valve system 25, 
which corresponds to the firing position "F". A manual swinging about of 
the safety lever 10 downwardly into the position "S" rotates the firing 
pin or striker 11 from the upwardly described line of action into the 
secured position. 
By means of a handle shell knob 14, the gripping shell of the grip member 5 
can be opened, and which there is located a compressed gas cartridge or a 
capsule 15 with, for example, CO.sub.2 gas. In this instance, there can 
also be utilized other suitable gases and air under a corresponding 
pressure. 
In a usual manner, the firearm 1 possess a sight 16 on the forward weapon 
barrel part and a sighting viewer 17 on the rear frame part which is in 
alignment with the sight 16. 
FIG. 2 now illustrates the unstressed and secured firearm 1 shown in 
cross-section. In order to disclose all of the functions and system in one 
representation, in the sectional representation, the essential components 
are illustrated superimposed on each other, and are recognizable and 
separated from each other only through the different kinds of drawing 
lines. To that extent, this sectional representation is a simplified, 
schematic illustration for an improved understanding of the 
interrelationships. In particular, the control arm 35 is clearly 
ascertainably illustrated and emphasized, without consideration being 
given to its actual position, which is partly covered by other 
constructional components. 
In the forward breech block part 6, the weapon barrel 3 can be ascertained 
with inserted O-ring 63, which at its end surface borders against the drum 
18. Thereby, the bore 19 of the drum 18 is oriented exactly coaxially 
relative to the barrel bore 21 for the receipt of projectiles or firing 
bodies 20. The drum 18 is rotatably arranged about an axle 22 which is 
inserted in the inner part. The axle bolt 22, upon displacement of the 
weapon barrel 3, is drawn out from the central bearing bore of the drum 
18. At the rearward end surface of the drum 18 there are arranged drive 
elements 23, for example, a crown of gear teeth or the like. Behind the 
drum 18 there is located the space 24 for the insertion of a valve system 
25, which is explained further hereinbelow in conjunction with FIG. 6. 
The trigger 4 is pivotable about the axis 27 in the direction of arrow 28 
within the trigger housing 26. The trigger 4 has a free, short arm 29, 
which is operatively connected by means of the linkage 30 with a slider 31 
which is movable along essentially a linear path. The along of the slider 
31 is hereby carried out along the path of motion 32 of the short arm 29 
of the trigger 4. Introduced into the slider 31 is a curved track 33 into 
which a bolt 34 is slidingly inserted, which articulatedly receives a 
control arm 35. This control arm 35 at its free end stands under the 
pressure of a spring 36, and engages into the drive elements 23 of the 
drum 18 so as to produce a stepwise rotational movement of the drum 18. 
For this purpose, tip of the free end of the control arm on 35 is 
correspondingly configured. 
The slider 31 possesses an adjusting edge 37 or 38, above, respectively, 
the linkage 34 and above the curved track 33 and both of which edges are 
arranged at a spacing from each other, which affords that always one 
adjusting edge 37 or, respectively 38, engages in the end positions of the 
slider 31 into corresponding adjusting recesses 39 arranged at the 
circumference of the drum 18. The adjusting recesses 39 are presently 
located between the drum bores 19, and in cooperation with the adjusting 
edges 37 or, respectively 38 of the slider 31, cause that after the 
effected rotation of the drum 18 through the control arm 35, there is 
assumed an exact coaxial position between the drum bore 19 and the weapon 
barrel bore 21 in the firing position. 
Through the actuation of the trigger 4 in the direction of arrow 28, the 
slider 31 is moved forwardly, as a result of which the bolt 34 slides in 
the curved track 33, and guides the control arm 35 upwardly. Since the tip 
of the control arm 34 is located in a corresponding radial distance from 
the longitudinal axis 40 of the drum axle 22, the upward movement of the 
control arm 35 produces a step-wise rotational movement of the drum 18 on 
the axle bolt 22. 
Moreover, a trigger rod 41 is operatively connected with the trigger 4, and 
which in turn stands with the hammer 12 in a ratchet connection. The 
hammer 12, in turn, stands under the force of a spring 42, which imparts 
an acceleration to the hammer 12 which is pivotable about axis 43 in the 
direction towards the firing pin 11. A further spring 44 and an elbow 
spring extending about axis 27 act in opposition to the movement of the 
trigger 4. 
The firing pin 11 is swung out of the line of action of the hammer 12 by 
means of the safety lever 10 and thereby finds itself in the safety 
position "S". Concurrently, the hammer 12 together with the trigger rod 41 
is in an unstressed condition. The springs 42 and 44 and the elbow spring 
extending about axis 27 are located in an idle position. 
A double-armed lever 45 is pivotable about an axial bolt 46 which is 
stationarily arranged in the trigger housing 26 of the firearm 1 up to 
specified end positions under the force of a spring 50. A first arm 48 
lies under spring force radially against the drum axle 22, as is 
illustrated in FIG. 5. In this position, the second arm 49 is located 
outside of the path of movement of the slider 31. The trigger system is, 
as a result, freely actuatable. 
FIG. 3 illustrates the compressed gas-operated firearm 1 in the firing 
position "F". The trigger 4 has been moved in accordance with the 
direction of arrow 28. As a result thereof, the slider 31 was forwardly 
moved. The control arm 35 was upwardly guided in the curved track 33 and 
has rotated the drum 18 further by one step, as a result of which a new 
drum bore 19 (for example, with an inserted projectile) has been brought 
into aligned position with the weapon barrel bore 21. This position is now 
precisely adjusted through the engagement of the adjusting edge 38 into 
the adjusting recesses 39 of the drum 18. The springs 42 and 44 and the 
elbow spring extending about axis 27 are tensioned. The hammer 12 finds 
itself in the outwardly pivoted striking position. The striker or firing 
pin 11 lies within the line of action between hammer 12 and the valve stem 
55. The trigger rod 41 is taken out of the ratchet connection, so there 
can be effected the discharge of a shot. 
FIGS. 4 and 5 clarify the automatic latching of the trigger 4, when the 
firearm 11 assumes the loading position. In this loading position, the 
barrel 3 is slid forwardly by means of a spring force after the release of 
the latching engagement by the breech block lever 7, so that the drum 18, 
for purpose of reloading with projectiles 20, can be withdrawn from the 
trigger housing 26, inasmuch as through the movement of the barrel 3 
forwardly, the axle bolt 22 of the drum 18 which is connected therewith is 
similarly pushed forwardly. The first arm 48 of the double-armed lever 45, 
due to the effective force of the spring 50 which, on the one side 
supports itself on the second arm 49 and on the other side fixedly in the 
trigger housing 26, swings radially into the longitudinal axis 40 of the 
drum 18. This is only then possible when the axle bolt 22 is moved out of 
the drum 18 and radially lies against the first arm 48 in the firing 
position. The second arm 49 is swung inwardly about the bolt 46 into the 
path of movement of the slider 31. As a result, there is blocked any 
movement of the slider 31, which by means of a rearward nose 51 stands 
against the arm 49. The blocking of the slider 31 acts on the trigger 4 
due to the interconnection of the elements whereby in this loading 
position of the firearm 1 the trigger cannot be actuated. 
The acceleration of the projectile 20 is effected upon the discharge of a 
shot in the firing position through a high impulse, which acts impact or 
sudden-like against the projectile 20. A CO.sub.2 capsule 50 is connected 
in a known manner to a valve system 25. The valve system 25 consists of a 
valve housing 52, through the opening in the bottom of which there is 
conducted a hollow-cylindrical valve stem 55, which is sealed by means of 
a disk 53 with an O-ring 54. The forward end surface of the valve stem 55 
is aligned with the drum bore 19 which is arranged in the firing position. 
An absolutely tightly sealed contact of this end surface is not necessary 
outside of the discharge of a shot. 
At its head end, the opening of the valve housing 52 is closed by a 
threaded nut 56 which possesses a central bore through which a bolt 55 is 
conducted so as to be longitudinally movable. The inside of the threaded 
nut 56 receives a ring seal 58. The valve stem 55 possesses a conical 
widening 59 at the end thereof facing towards the threaded nut 56, and 
lies sealingly with the end of the outer edge of the widening 59 against 
the ring seal 58. A spring 60 which encompasses the valve stem 55 supports 
itself, at one side, at the bottom of the valve housing 52, and on the 
other side on the conical widening 59 of the valve stem 55; whereby there 
is attained the sealing contact of the valve stem 55 on the ring seal 58. 
From the CO.sub.2 capsule 15 a passageway 61 leads into the compressed gas 
chamber 62 of the valve housing 52, so that in this chamber 62 there 
reigns a constant gas pressure from the CO.sub.2 capsule 15. 
Upon the discharge of a shot, the hammer 12 strikes in a described manner 
against the firing pin 11. From the latter, the striking effect is 
transmitted directly to the valve stem 55. The valve stem 55 releases 
itself for a short period of time from the sealed contact against the ring 
seal 58, whereby the gas flows sudden-like into the interior space of the 
valve stem 55, and impulse-like acts on the projectile 20. In the instance 
of the effective gas impulse, the forward end surface of the valve stem 55 
lies sealingly against the drum 18 at an alignment with the drum bore 19. 
Due to the valve system this sealing contact is caused by the effective 
gas in connection with the sudden impulse. This valve system 25 allows for 
a secure single shot and also the discharge of a series of shots without 
any essentially adverse influence over the firing power.