EP0158707B1 - Gas expansion chamber for an automatic, gas-operated firearm - Google Patents

Gas expansion chamber for an automatic, gas-operated firearm Download PDF

Info

Publication number
EP0158707B1
EP0158707B1 EP84110428A EP84110428A EP0158707B1 EP 0158707 B1 EP0158707 B1 EP 0158707B1 EP 84110428 A EP84110428 A EP 84110428A EP 84110428 A EP84110428 A EP 84110428A EP 0158707 B1 EP0158707 B1 EP 0158707B1
Authority
EP
European Patent Office
Prior art keywords
expansion chamber
gas
propellant gas
flow
fact
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.)
Expired
Application number
EP84110428A
Other languages
German (de)
French (fr)
Other versions
EP0158707A2 (en
EP0158707A3 (en
Inventor
Clemens Ing. Bremer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rheinmetall Industrie AG
Original Assignee
Rheinmetall GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rheinmetall GmbH filed Critical Rheinmetall GmbH
Publication of EP0158707A2 publication Critical patent/EP0158707A2/en
Publication of EP0158707A3 publication Critical patent/EP0158707A3/en
Application granted granted Critical
Publication of EP0158707B1 publication Critical patent/EP0158707B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A5/00—Mechanisms or systems operated by propellant charge energy for automatically opening the lock
    • F41A5/18—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated
    • F41A5/26—Arrangements or systems for bleeding the gas from the barrel

Definitions

  • the invention relates to an expansion chamber according to the preamble of claim 1.
  • a generic object is known from DE-C2-2809505.
  • a valve body with a central passage with a reduced flow cross-section and with a by-pass is assigned to the entry into the expansion chamber. The latter is opened when the branched propellant gas flowing into the expansion chamber moves the valve body from an initial position in the direction of flow and then closes again under its pressure and back movement of the valve body to its initial position which builds up in the expansion chamber. In this way, a working gas volume is available for the working piston in the expansion chamber for a sufficient time.
  • the valve body In view of the high flow velocity of the branched propellant gas, not only is the valve body exposed to a high and wear-promoting load, but the working piston is also subjected to an extremely hard load. This can disadvantageously lead to malfunctions which impair the availability of a suitably equipped weapon.
  • the invention has for its object to develop a generic object in such a way that the risk of operational disruption is drastically reduced or eliminated.
  • An expansion chamber 10 has in its lower region a cavity 18 which is delimited by a spherical cap surface 20.
  • a gas branch 30 from a weapon barrel (not shown) opens into the cavity 18 via a nozzle 16.
  • a first surface 12 protrudes into the flow path 11 of a gas 14 and is arranged downstream of the spherical cap surface 20.
  • the cavity 18 is open on the upper side, and a curved second surface 22 facing away from the first surface 12 leads from the expansion chamber 10 to a transition 24 into a cylinder 26 in which a working piston 28 is guided for reciprocation along its longitudinal axis.
  • the gas 14 entering the cavity 18 from the gas branch 30 through the nozzle 16 on its flow path 11 is deflected upward on the first surface 12 into the expansion chamber 10 and swirled. Under the pressure building up in the expansion chamber 10, the gas 14 passes along the second surface 22 through the transition 24 into the cylinder 26 behind the working piston 28 and shifts it in the direction of an arrow 32 for energy delivery to a device, not shown. The working piston 28 is then moved back into its starting position shown in the figure in a manner not shown and described in detail.
  • the disadvantageous gas impact on the working piston 28 is avoided in a simple manner. Since the cross section of the nozzle 16 is smaller than the cross section of the transition 24, the gas pressure prevailing in the expansion chamber 10 for actuating the working piston 28 is maintained for a sufficient time.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Toys (AREA)

Description

Die Erfindung betrifft eine Expansionskammer nach dem Oberbegriff des Patentanspruchs 1.The invention relates to an expansion chamber according to the preamble of claim 1.

Ein gattungsgleicher Gegenstand ist bekannt aus der DE-C2-2809505. Dem Eintritt in die Expansionskammer ist ein Ventilkörper mit einem zentralen Durchtritt verringerten Durchströmungsquerschnitts und mit einem by-pass zugeordnet. Letzterer wird geöffnet, wenn das in die Expansionskammer einströmende abgezweigte Treibgas den Ventilkörper aus einer Ausgangsstellung in Strömungsrichtung bewegt und anschliessend unter dem sich in der Expansionskammer aufbauenden Druck und Rückbewegung des Ventilkörpers in seine Ausgangsstellung wieder verschlossen. Dieserart ist in der Expansionskammer während einer ausreichenden Zeit ein arbeitsfähiges Gasvolumen für den Arbeitskolben verfügbar. Angesichts der hohen Strömungsgeschwindigkeit des abgezweigten Treibgases ist nicht nur der Ventilkörper einer hohen und verschleissfördernden Belastung ausgesetzt, sondern auch der Arbeitskolben wird ausserordentlich hart beaufschlagt. Hierdurch kann es nachteiligerweise zu Betriebsstörungen kommen, welche die Verfügbarkeit einer entsprechend ausgerüsteten Waffe beeinträchtigt.A generic object is known from DE-C2-2809505. A valve body with a central passage with a reduced flow cross-section and with a by-pass is assigned to the entry into the expansion chamber. The latter is opened when the branched propellant gas flowing into the expansion chamber moves the valve body from an initial position in the direction of flow and then closes again under its pressure and back movement of the valve body to its initial position which builds up in the expansion chamber. In this way, a working gas volume is available for the working piston in the expansion chamber for a sufficient time. In view of the high flow velocity of the branched propellant gas, not only is the valve body exposed to a high and wear-promoting load, but the working piston is also subjected to an extremely hard load. This can disadvantageously lead to malfunctions which impair the availability of a suitably equipped weapon.

Der Erfindung liegt die Aufgabe zugrunde, einen gattungsgleichen Gegenstand derart weiter zu entwickeln, dass die Gefahr von betreffenden Betriebsstörungen drastisch verringert oder ausgeräumt wird.The invention has for its object to develop a generic object in such a way that the risk of operational disruption is drastically reduced or eliminated.

Gelöst wird die Aufgabe durch die im Kennzeichen des Patentanspruchs angegebene Erfindung.The object is achieved by the invention specified in the characterizing part of the patent claim.

Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten bevorzugten Ausführungsbeispiels näher erläutert, wobei die einzige Figur der Zeichnung einen längsaxialen Schnitt zeigt.The invention is explained below with reference to a preferred embodiment shown in the drawing, the single figure of the drawing showing a longitudinal axial section.

Eine Expansionskammer 10 weist in ihrem unteren Bereich einen Hohlraum 18 auf, der von einer Kugelkalottenfläche 20 begrenzt wird. Eine Gasabzweigung 30 aus einem nicht dargestellten Waffenrohr mündet über eine Düse 16 in den Hohlraum 18. In den Strömungsweg 11 eines Gases 14 steht eine erste Fläche 12 vor, die der Kugelkalottenfläche 20 nachgeordnet ist. Der Hohlraum 18 ist oberseitig offen, und eine der ersten Fläche 12 abgewandte gebogene zweite Fläche 22 führt aus der Expansionskammer 10 zu einem Übertritt 24 in einen Zylinder 26, in welchem ein Arbeitskolben 28 zur Hin- und Herbewegung entlang seiner Längsachse geführt ist.An expansion chamber 10 has in its lower region a cavity 18 which is delimited by a spherical cap surface 20. A gas branch 30 from a weapon barrel (not shown) opens into the cavity 18 via a nozzle 16. A first surface 12 protrudes into the flow path 11 of a gas 14 and is arranged downstream of the spherical cap surface 20. The cavity 18 is open on the upper side, and a curved second surface 22 facing away from the first surface 12 leads from the expansion chamber 10 to a transition 24 into a cylinder 26 in which a working piston 28 is guided for reciprocation along its longitudinal axis.

Das aus der Gasabzweigung 30 durch die Düse 16 auf seinem Strömungsweg 11 in den Hohlraum 18 eintretende Gas 14wird an der ersten Fläche 12 nach oben in die Expansionskammer 10 umgelenkt und verwirbelt. Unter dem sich in der Expansionskammer 10 aufbauenden Druck gelangt das Gas 14 entlang der zweiten Fläche 22 durch den Übertritt 24 in den Zylinder 26 hinter dem Arbeitskolben 28 und verschiebt diesen in Richtung eines Pfeils 32 zur Energieabgabe an eine nicht dargestellte Vorrichtung. Anschliessend wird der Arbeitskolben 28 auf nicht näher dargestellte und beschriebene Weise in seine in der Figur dargestellte Ausgangsstellung zurückbewegt.The gas 14 entering the cavity 18 from the gas branch 30 through the nozzle 16 on its flow path 11 is deflected upward on the first surface 12 into the expansion chamber 10 and swirled. Under the pressure building up in the expansion chamber 10, the gas 14 passes along the second surface 22 through the transition 24 into the cylinder 26 behind the working piston 28 and shifts it in the direction of an arrow 32 for energy delivery to a device, not shown. The working piston 28 is then moved back into its starting position shown in the figure in a manner not shown and described in detail.

Bei einem sich anschliessenden Schusszyklus ergibt sich der vorbeschriebene Ablauf von Vorgängen.With a subsequent firing cycle, the above-described sequence of operations results.

Durch die Umlenkung und Verwirbelung des Gases 14 in der Expansionskammer 10 wird der nachteilige Gasschlag auf den Arbeitskolben 28 auf einfache Weise vermieden. Da der Querschnitt der Düse 16 kleiner ist als der Querschnitt des Übertritts 24, bleibt der in der Expansionskammer 10 anstehende Gasdruck zum Betätigen des Arbeitskolbens 28 über eine ausreichende Zeit aufrechterhalten.By deflecting and swirling the gas 14 in the expansion chamber 10, the disadvantageous gas impact on the working piston 28 is avoided in a simple manner. Since the cross section of the nozzle 16 is smaller than the cross section of the transition 24, the gas pressure prevailing in the expansion chamber 10 for actuating the working piston 28 is maintained for a sufficient time.

Claims (4)

1. An expansion chamber (10) constructed as a gas retaining chamber which is continuously located in the flow path between a propellant gas branch (30) from a weapon barrel and a cylinder (26) with a working piston (28) to be operated by the divided-off propellant gas in order to drive a device, preferably on an automatic barrel-type weapon, and which, in an inlet for the divided-off propellant gas, is provided with a zone of reduced through-flow cross section, characterised by the fact that the zone of reduced through-flow cross section takes the form of a fixed nozzle (16) followed inside the expansion chamber (10), by a deviating surface (12) projecting into the flow tra- ject (11) of the branched-off propellant gas (14).
2. Expansion chamber in accordance with Claim 1, characterised by the fact that a hollow space (18) open at the top, is provided between the nozzle (16) and the deviating surface (12).
3. Expansion chamber in accordance with Claim 2, characterised by the fact that the hollow space (18) is delimited by a calotte-shaped surface which, as viewed in the direction of flow of the divided-off propellant gas, is followed by the deviating surface (12).
4. Expansion chamber in accordance with Claims 1, 2 or 3, characterised by a bent surface (22) facing away from the deviating surface (12) and continuing in the form of a passage (24) from the expansion chamber (14) into the cylinder (26).
EP84110428A 1983-10-08 1984-09-01 Gas expansion chamber for an automatic, gas-operated firearm Expired EP0158707B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833336634 DE3336634A1 (en) 1983-10-08 1983-10-08 GAS STORAGE BETWEEN A DRIVING GAS DIVISION AND A CYLINDER WITH A WORKING PISTON FOR DRIVING A DEVICE, PREFERABLY ON AN AUTOMATIC PISTON ARM
DE3336634 1983-10-08

Publications (3)

Publication Number Publication Date
EP0158707A2 EP0158707A2 (en) 1985-10-23
EP0158707A3 EP0158707A3 (en) 1986-04-23
EP0158707B1 true EP0158707B1 (en) 1988-05-11

Family

ID=6211329

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84110428A Expired EP0158707B1 (en) 1983-10-08 1984-09-01 Gas expansion chamber for an automatic, gas-operated firearm

Country Status (2)

Country Link
EP (1) EP0158707B1 (en)
DE (2) DE3336634A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9383149B2 (en) 2012-12-05 2016-07-05 Ra Brands, L.L.C. Gas-operated firearm with pressure compensating gas piston
US9097475B2 (en) 2012-12-05 2015-08-04 Ra Brands, L.L.C. Gas-operated firearm with pressure compensating gas piston
US9212856B2 (en) 2012-12-26 2015-12-15 Ra Brands, L.L.C. Gas cut-off system for firearms
US8950313B2 (en) 2013-01-04 2015-02-10 Ra Brands, L.L.C. Self regulating gas system for suppressed weapons
US8887616B2 (en) 2013-01-11 2014-11-18 Ra Brands, L.L.C. Auto regulating gas system for supressed weapons
US9500423B2 (en) 2014-01-24 2016-11-22 Ra Brands, L.L.C. Method and mechanism for automatic regulation of gas flow when mounting a suppressor to a firearm

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE749455C (en) * 1939-06-15 1944-12-16 Slot-controlled two-stroke internal combustion engine
AT174500B (en) * 1941-02-17 1953-04-10 Leon Dufour Two-stroke internal combustion engine with inlet and outlet slots controlled by the piston
DE2809505C2 (en) * 1978-03-06 1982-10-07 Rheinmetall GmbH, 4000 Düsseldorf Belt feeder drive for an automatic gas-operated gun, in particular a machine gun

Also Published As

Publication number Publication date
DE3471159D1 (en) 1988-06-16
DE3336634A1 (en) 1985-04-25
EP0158707A2 (en) 1985-10-23
EP0158707A3 (en) 1986-04-23

Similar Documents

Publication Publication Date Title
EP1663504B1 (en) Cleaning lance
EP0596376A1 (en) Air gun for removing bulk material adhering and accumulating
DE1910093A1 (en) Paint spraying system
EP0158707B1 (en) Gas expansion chamber for an automatic, gas-operated firearm
EP0780195A1 (en) Powder driven fastener tool with a non-return valve for returning the driver piston
DE3844489A1 (en) FUEL INJECTION DEVICE
DE2746037C3 (en) High pressure cleaning device
EP0105493A2 (en) Nozzle for a spray-gun, especially for a low-pressure spray-gun
EP0497255B1 (en) Delivering nozzle for media
DE4105379C2 (en) Washing device for cover plates of motor vehicle lights
DE2922576A1 (en) JET ENGINE WITH THROUGH VECTOR CONTROL
DE2749812C2 (en) Full lift safety valve
EP0352584A2 (en) Projectile rammer for the ordnance
DE3116541A1 (en) DEVICE FOR QUICKLY STOPPING A FOREIGN DRIVEN MACHINE CANNON
DE1288958B (en) Sealing piston for automatic firearms
DE69823807T2 (en) MONOSTABLE VALVE
DE3011172C2 (en) Device for preselecting the rate of bursts of fire from a barrel gun designed as a gas pressure gun
EP3728809B1 (en) Piston cooling nozzle
DE1476802A1 (en) Device for reducing the effects of temperature in a pneumatic control and regulating device for a gas turbine engine
DE4330651C2 (en) Additional equipment for a water withdrawal point
DE3326373A1 (en) BRAKE CONTROL VALVE DEVICE OF AN INDIRECTLY ACTIVE AIR BRAKE FOR RAIL VEHICLES
EP1400774B1 (en) Pressurised gas weapon
DE1803822A1 (en) Full-lift safety valve
DE2544811A1 (en) Two-stage yarn suction device - operates efficiently at yarn speeds of more than 4000 metres per minute
DE2914966A1 (en) Fuel injection nozzle with secondary hydraulic control element - operated directly by EM device and using injected fuel pressure as control pressure of main hydraulic control element

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

Designated state(s): CH DE FR IT LI SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): CH DE FR IT LI SE

17P Request for examination filed

Effective date: 19860318

17Q First examination report despatched

Effective date: 19870128

ITF It: translation for a ep patent filed

Owner name: CALVANI SALVI E VERONELLI S.R.L.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR IT LI SE

REF Corresponds to:

Ref document number: 3471159

Country of ref document: DE

Date of ref document: 19880616

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19890809

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19890830

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19890906

Year of fee payment: 6

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19900902

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19900930

Ref country code: CH

Effective date: 19900930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19910530

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19920819

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19940601

EUG Se: european patent has lapsed

Ref document number: 84110428.4

Effective date: 19910527