DE102020001253A1 - Method for securing a threaded connection between a firearm and an attachment - Google Patents

Abstract

A method for securing a threaded connection between a firearm and an attachment is described, which is characterized in that a bolt thread is designed as a standard thread and that each thread turn of a nut thread between its front and its rear thread flank has a flattening that the rear Thread flank is facing, which has an angle relative to the thread axis between 15 ° and 45 °, this angle being smaller than the angle of the rear thread flank of the bolt thread relative to the thread axis and wherein the contact of the thread connection between the tip of each thread turn of the bolt thread is under tensile load and the flattening takes place in the nut thread.

Description

The invention relates to a method for securing a threaded connection between a firearm and an attachment.

When a firearm is fired, various forces act on the overall system when the shot is fired or the repeating process. For example, the recoil causes the weapon to run back against the direction of fire. At the same time, many systems have an upward force component, the so-called high impact. Even when repeating a semi-automatic or fully automatic weapon, strong forces act on the system due to the bolt. Depending on the design of the overall system, a wide variety of forces occur in various directions. These forces and the associated vibrations can loosen the threaded connections that are used between a firearm and its attachments.

Add-on parts can be, for example, muzzle components such as silencers, muzzle brakes, flash suppressors or any other component that can be screwed onto the muzzle thread of a gun barrel.

Other add-on parts can be, for example, telescopic sight mounts, sights, bipods, handles, lamps, lasers, belt holders or any other component that can be connected to a firearm with a screw connection.

The gun barrel is set in vibration by the previously described forces that occur when the shot is fired or the repeating process. The shorter and thicker the barrel, the lower these vibrations are in relation to the forces acting on it. A particularly long and thin barrel, as can be found in particular on hunting rifles, therefore has a very strong tendency to swing. In the case of semi or fully automatic weapons, a high cadence causes very strong vibrations in the gun barrel. The cadence is understood to mean the sequence of shots or the number of shots per unit of time. The weapon housing on which the telescopic sight assembly sits with the target optics and the shaft or handguard of a firearm are also exposed to these vibrations and shocks.

The vibrations or shocks described lead to a relative movement between the thread flanks of the thread connection. In particular, the force components that act transversely to the thread axis contribute to loosening screw connections.

In order to prevent a thread connection between the firearm and the attachment from loosening, it is therefore advisable to install a thread lock.

The muzzle thread of a firearm is attached by the weapon manufacturer himself or later by a gunsmith. Standard bolt threads Metric Fine (MF), Unified Fine (UNF) or Unified Extra Fine (UNEF) are most commonly used as right-hand or left-hand threads. Manufacturers of muzzle components therefore have no influence on the design of the muzzle thread and can therefore only install a thread lock in the nut thread of their muzzle components.

• - Federringe DIN127, DIN128, DIN7980
• - Federscheiben DIN137
• - Fächerscheiben DIN6798
• - Zahnscheiben DIN6797
• - Sicherungsbleche DIN93, DIN432, DIN463
• - Sicherungsmuttern DIN7967

Various types of thread locks are known and also standardized in the prior art. The most popular types of security and their disadvantages when securing a threaded connection between a weapon and an attachment are listed below.

• - Spring washers DIN127, DIN128, DIN7980
• - Spring washers DIN137
• - Serrated lock washers DIN6798
• - Toothed lock washers DIN6797
• - Lock washers DIN93, DIN432, DIN463
• - Lock nuts DIN7967

• - Tellerfedern DIN2093
• - Spannscheiben DIN6796

In these embodiments of thread locking, the locking effect is achieved by an additional component which is placed between the two thread-bearing components. Such an additional component can be lost with repeated assembly and disassembly. Because of their low securing effect, these securing elements were withdrawn by the standardization body in 2003 and declared ineffective for screws from strength class 8.

• - Disc springs DIN2093
• - Spring washers DIN6796

• - Muttern mit Klemmteil aus Stahl DIN980
• - Muttern mit Klemmteil aus Kunststoff DIN982, DIN985
• - Sechskant-Hutmuttern mit Klemmteil DIN986

These two securing elements are part of the setting safeguards. Here, too, the securing effect is achieved by an additional component which can be lost.

• - Nuts with clamping part made of steel DIN980
• - Nuts with clamping part made of plastic DIN982, DIN985
• - Hexagon cap nuts with clamping part DIN986

• - Sechskantmuttern mit Flansch und Sperrverzahnung DIN6923, DIN 6926
• - Sechskantschrauben mit Flansch DIN1665
• - Keilsicherungsscheiben bzw. Spannscheiben mit Verzahnungen auf den Kontaktflächen zum Bauteil oder der Schrauben/Mutter

These embodiments of the securing are classified as loss safeguards. In the case of a loss protection, the Link this release movement to a standstill. This embodiment of the safety device is therefore not suitable for securing telescopic sight mountings, since in this application the full clamping force must be maintained so that there are no deviations in the point of impact. If the user unscrews the lock nuts too far when dismantling the attachment, they can be lost. These are nuts in a special design into which the corresponding clamping parts are inserted by the manufacturer of the nuts. In the case of a mouth component, this nut would have to be firmly connected to it as an additional component, which would result in increased manufacturing effort. In addition, clamping parts made of plastic cannot withstand the very high temperatures in the mouth area.

• - Hexagon nuts with flange and locking teeth DIN6923, DIN 6926
• - Hexagon bolts with flange DIN1665
• - Wedge lock washers or tension washers with teeth on the contact surfaces to the component or the screw / nut

• - Chemische Schraubensicherungen
• - Anaerobe Klebstoffe, wie z.B. Loctite®

These types of securing belong to the anti-rotation locks. Nuts and screws with flange and under-head toothing do not require any additional components, but can be lost if they are repeatedly assembled and disassembled. Wedge lock washers or conical spring washers with toothing must be placed as additional components between the thread-bearing components.

• - Chemical screw locks
• - Anaerobic adhesives such as Loctite®

• - Mikroverkapselte Klebstoffe

Anaerobic adhesives have the disadvantage that they have to be applied to the degreased thread before assembly and are unusable after dismantling. In addition, most chemical screw locks cannot withstand the very high temperatures in the mouth area.

• - Microencapsulated adhesives

Microencapsulated adhesives have the advantage that they can be applied during the manufacturing process and can withstand multiple assembly / disassembly. However, the number of assembly / disassembly processes is limited. The temperature resistance of microencapsulated adhesives is not sufficient when used in the mouth area.

In the US 2012/0103176 A1 Gregory S. Latka describes a safety device and a method for securing a silencer on a weapon. With this method, a disc spring or a wave spring must be installed as an additional securing element.

In the US 4171012 by Horace D. Holmes a thread lock is described in which, in one embodiment, the bolt thread is designed as a standard thread. The securing effect is achieved by the fact that, in the event of a tensile load, the contact between the tip of each thread turn of the bolt thread and a flattening in the nut thread takes place. This flattening has an angle to the thread axis between 15 ° and 45 °. This angle is significantly smaller than the angle of the rear thread flank of the bolt thread relative to the thread axis. Thus, relative movements between the two thread-bearing components transversely to the thread axis are prevented and the thread connection is prevented from loosening.

This type of securing does not lose its securing effect even with frequent assembly or disassembly and is also suitable for use at very high temperatures by dispensing with clamping parts made of plastic or using adhesives. No additional securing elements have to be installed, which could possibly be lost, and the nut thread can be easily produced by known production methods such as thread cutting, thread forming, thread milling or thread turning. The tool used in production forms the nut thread including the flattening due to its geometric shape. The effort involved in producing the thread is therefore no greater than in producing a standard nut thread. This type of safety device is therefore ideally suited for securing threaded connections between firearms and their attachments.

The object of the invention is to overcome the described disadvantages of the prior art. The object of the invention is also to provide a method for securing a threaded connection between a firearm and its attachment, in which the bolt thread is designed as a standard thread that can be assembled or disassembled several times without losing its locking effect and that too is applicable at very high temperatures. Furthermore, the method should manage without the use of additional security elements and its components should be easy to manufacture.

The object of the invention is achieved by a method for securing a thread connection between a firearm and an attachment, which is characterized in that a bolt thread is designed as a standard thread and that each thread turn of a nut thread has a flattening between its front and rear thread flank facing the rear thread flank, which has an angle relative to the thread axis between 15 ° and 45 °, this angle being smaller than the angle of the rear thread flank of the bolt thread relative to the thread axis and the contact of the threaded connection between the tip of each thread turn of the bolt thread and the flat in the nut thread taking place under tensile load.

The object of the invention is also achieved by the method mentioned, which is characterized in that the securing effect is achieved without additional mechanical securing elements.

The object of the invention is also achieved by a method which is characterized in that the securing effect is achieved without adhesives or clamping parts made of plastic.

The object of the invention is also achieved by a method which is characterized in that the flattening in the nut thread can be formed during the thread production without an additional work step.

The method according to the invention fulfills the stated requirements in an excellent manner. The add-on parts to the weapon housing, the stock or the handguard can also be mounted or dismantled multiple times and have no parts that can be lost.

A particularly advantageous embodiment is explained in more detail below with reference to the figures.

• 1 eine perspektivische Darstellung einer Picatinny-Schiene, eines Zielfernrohrs und einer Zielfernrohrmontage,
• 2 eine Darstellung einer Picatinny-Schiene, eines Zielfernrohrs und eine Zielfernrohrmontage im Schnitt,
• 3 eine Einzelheit aus 2,
• 4 eine perspektivische Darstellung des Laufs einer Feuerwaffe und eines Schalldämpfers,
• 5 eine Darstellung des Laufs einer Feuerwaffe und eines darauf montierten Schalldämpfers im Schnitt und
• 6 eine Einzelheit aus 5.

Show it:

• 1 a perspective view of a Picatinny rail, a telescopic sight and a telescopic sight mount,
• 2 a representation of a Picatinny rail, a telescopic sight and a telescopic sight mount in section,
• 3 a detail 2 ,
• 4th a perspective view of the barrel of a firearm and a silencer,
• 5 a representation of the barrel of a firearm and a silencer mounted on it in section and
• 6th a detail 5 .

1 shows a so-called Picatinny rail 1 . Such splints after the Mil-Std. 1913 and NATO-STANAG 4694 have established themselves in the military as well as in the hunting sector for attaching attachments such as telescopic sight mounts, bipods, sights and strap attachments. However, various other interfaces such as 11mm, 12mm or 16mm wide prism rails, the M-LOK® system or the KeyMod system are also common. In this case, these interfaces can be worked out directly from the weapon housing, the stock or the handguard or can be screwed tightly to the weapon. In 1 is the Picatinny rail 1 for example with countersunk holes 2a , 2 B , 2c , 2d Mistake. With the help of the fastening screws 3a , 3b , 3c , 3d becomes the Picatinny rail 1 firmly screwed to the weapon housing. The rifle scope 4th can by means of the scope mount 5 on the Picatinny rail 1 put on and there by means of the hexagon nuts 6a , 6b be screwed. The telescopic sight mount can be used for transporting or cleaning the weapon 5 with the rifle scope 4th from the Picatinny rail 1 removed after the two hex nuts 6a , 6b have been resolved.

From the sectional view in 2 is the structure of the threaded connection between the Picatinny rail 1 and scope mount 5 evident. The actual thread connection is made by the hexagon nut 6a respectively. 6b and the cross bolt 7a respectively. 7b educated. The hex nut 6b and the cross bolt 7b will be in 2 from the hex nut 6a and the cross bolt 7a covered and therefore not visible. When tightening the hexagon nut 6a respectively. 6b becomes the terminal block 8th against the lower prism flank of the Picatinny rail 1 pressed and thus ensures a firm fit of the scope mount 5 on the Picatinny rail 1 .

The detail X in 3 shows the detailed structure of the thread lock of the thread connection between the Picatinny rail 1 and scope mount 5 the end 2 . This structure corresponds to 12th in the US 4171012 by Horace D. Holmes. The external thread of the cross screw 7a is designed as a standard thread. The internal thread of the hex nut 6a also has the geometry of a standard thread, but with an additional flattening 9 . This flattening has an angle α between 15 ° and 45 ° to the thread axis, which is significantly smaller than the angle α 'of the rear thread flank of the external thread of the cross screw 7a to the thread axis. In this case, the thread connection is designed as a metric ISO thread, which has a flank angle of 60 °. The angle between the front and the rear thread flank is referred to as the flank angle. The angle α 'is therefore 60 ° and the angle α is designed to be 30 °. When tightening the hexagon nut 6a comes the top 10 of the external thread of the cross screw 7a in contact with the flattening 9 the internal thread of the hexagon nut 6a . This contact prevents a relative movement transversely to the thread axis between the two thread-bearing components and a loosening of the thread connection is thus prevented.

4th shows the run 11 a firearm and a silencer 13th . The run 11 is with a barrel thread 12th provided, which is designed as an external thread with the geometry of a standard thread on which the silencer 13th with its internal thread 14th can be screwed on.

From the sectional view in 5 is building the thread connection between barrel 11 and muffler 13th evident. When tightening the silencer 13th on the run 11 becomes the floor area 15th against the contact shoulder 16 pressed and thus ensures a tight fit of the silencer 13th on the run 11 .

The detail Z in 6th shows the detailed structure of the thread lock of the thread connection between barrel 11 and muffler 13th . The barrel thread 12th is designed as an external thread with the geometry of a standard thread. The internal thread 14th of the silencer 13th also has the geometry of a standard thread, but with an additional flattening 15th . This flattening has an angle β between 15 ° and 45 ° to the thread axis, which is significantly smaller than the angle β 'of the rear thread flank of the barrel thread 12th to the thread axis. In this case, the thread connection is designed as a metric ISO fine thread, which has a flank angle of 60 °. The angle β 'is therefore 60 ° and the angle β is designed to be 30 °. When tightening the silencer 13th comes the top 18th of the barrel thread 12th in contact with the flat 17th of the internal thread 14th in the muffler 13th . This contact prevents a relative movement transversely to the thread axis between the two thread-bearing components and a loosening of the thread connection is prevented.

The presented method is not limited to certain thread forms, but can be used for almost all thread forms, such as trapezoidal threads, buttress threads. The process can be used with interrupted threads as well as in the DE 2020 18 005 980 U1 apply as described.

The method presented is not limited to a certain number of thread turns per revolution, but can be used for both single and multi-start threads.

Likewise, the presented method is not limited to certain types of attachments on firearms, but can be used for almost all types of attachments such as silencers, flash hammers, muzzle brakes, blast deflectors, telescopic sight mounts, strap mounts, mounts for sleeve catchers, mounts for red dot sights, open sights .

List of reference symbols

1

Picatinny rail

2a, 2b, 2c, 2d

Counterbores

3a, 3b, 3c, 3d

Fastening screws

4th

Rifle scope

5

Scope mount

6a, 6b

Hexagon nut

7a, 7b

Cross screw

8th

Terminal block

9

Flattening in the internal thread of the hexagon nut

10

Point on the thread of the cross screw

11

Run

12th

Barrel thread

13th

silencer

14th

Internal thread in the muffler

15th

Floor area

16

Contact shoulder

17th

Flattening in the internal thread in the silencer

18th

Point on the barrel thread

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 2012/0103176 A1 [0016]
• US 4171012 [0017, 0029]
• DE 202018005980 U1 [0033]

Claims (4)

A method for securing a threaded connection between a firearm and an attachment, characterized in that a bolt thread is designed as a standard thread and that each thread turn of a nut thread between its front and its rear thread flank has a flattening that faces the rear thread flank, the one Has an angle relative to the thread axis between 15 ° and 45 °, this angle being smaller than the angle of the rear thread flank of the bolt thread relative to the thread axis and with the contact of the thread connection between the tip of each thread turn of the bolt thread and the flattening in the nut thread taking place under tensile load . Procedure according to Claim 1 , characterized in that the securing effect is achieved without additional mechanical securing elements. Procedure according to Claim 1 or 2 , characterized in that the securing effect is achieved without adhesives or clamping parts made of plastic. Method according to one of the Claims 1 - 3 , characterized in that the flattening in the nut thread can be formed during thread production without an additional operation.

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