EP3839410A1 - Dust cover for a firearm - Google Patents

Abstract

The invention relates to a dust cover for a firearm, comprising a first socket (24) and a second socket (25), a pin (10) guided in the first socket (24) with a pin end (13) and a lid spring (9)

For tool-free assembly / disassembly and dismantling / reassembly, provision is made for the pin (10) to be spring-preloaded in the axial direction at least in the first bushing (24) and for a guide extension (11) to interact with a guide groove (12) on the pin (10) ) and an insertion groove (26) of the first socket (24) is formed. An insertion groove (26) is formed on the inside of the first bushing (24) parallel to the axis of rotation of the pin (10), which starts at the outer end of the bushing (24) and ends at the guide groove (12) and with the guide groove (12) connected is.

Description

The invention relates to a dust cover for a present firearm according to the preamble of claim 1, which enables easier installation and removal of the dust cover due to a special shape.

The present firearm, because dust protection covers are independently traded parts that are manufactured and traded to replace existing covers, the weapon itself therefore only provides the geometrical boundary conditions, but is not necessarily part of the invention.

The dust protection cover according to the invention is a modification of the dust protection cover known per se for long weapons, in particular for fully and / or semi-automatic gas pressure guns such as the M4 / M16 / AR15 type. The improvements are listed after the discussion of the state of the art including the achievable effects / advantages.

With semi-automatic and automatic firearms, such as the M4 / M16- or AR15-based systems, the (semi) automatic reloading process takes place by moving the slide back and forth. When it moves backwards, the slide pulls the fired and thus empty cartridge case backwards from the chamber by means of its pull-out claw. If the cartridge case reaches the ejection opening in the frame of the weapon over its full length, the ejector, which is pretensioned by means of a spring, pushes the case out of the weapon through the ejection opening. For this purpose, the ejection opening must of course be open and offer the empty tube a barrier-free path to the outside.

A permanently open ejection opening is very disadvantageous, however, since moisture, sand, mud, other dirt and also other environmental influences can very easily penetrate directly into the interior of the weapon, and also into the area of the mechanically sensitive lock. Such soiling can subsequently lead to a more difficult reloading process due to increased friction Cause inhibitions. Furthermore, dust, sand etc. sometimes have a very abrasive effect and thus promote premature and unwanted material wear.

By attaching a dust cover, which is only opened or removed during shooting, the ingress of dirt and the associated negative effects can be prevented.

Removable and opening dust covers are known from the prior art.

In the EP 1 893 933 A2 ( Fig. 4 +5), for example, a dust cover for the M4 / M16 / AR15 system is described. This dust cover can be pivoted around a simple pin and is connected to the housing with this pin. The pin is mounted in two recesses at each end and prevented from falling out with locking pins. The pin and with it the dust cover can accordingly only be removed with considerable effort and with the aid of tools after removing the locking pins. A quick exchange of the dust cover without the aid of tools is not possible.

US 7,181,881 B2 discloses a dust cover with a magnetic locking mechanism on a rifle of the so-called "Bullpup" design. The dust cover is attached to the housing so that it can pivot about an axis and, when closed, closes the ejection opening accordingly. The dust cover is kept closed by magnets both in the cover and in the frame, the production is correspondingly complex. No description is given of the possibly necessary replacement of the dust cover.

A rotating mechanism for a dust cover that automatically opens and closes according to the firing sequence is in the U.S. 4,044,487 A shown. The dust cover located inside the housing has a control link and is moved by a control bolt attached to the moving lock. Depending on the position of the lock, the dust cover opens and closes with a twisting movement and releases or covers the ejection opening.

This multi-part construction requires a corresponding effort in production, and quick replacement is not possible. Thanks to the dust cover located inside the housing, moisture and dirt can still easily penetrate. In combination with the rotatable construction, escapements are possible.

The US 9,086,247 B2 discloses a dust cover which is held on the housing by means of a continuous pin. The pin is inserted from below and attached using a snap mechanism. The play required for insertion, in conjunction with heavy loads in use and possible bending of the pin, can lead to the pin being unintentionally unhooked or even to the loss of the pin and the dust cover. This can lead to inhibitions and / or premature wear and tear, particularly in longer field use.

The content of these publications is made part of the disclosure of this application by reference for the jurisdictions in which this is possible.

There is therefore a need for a dust cover which does not have the disadvantages of the prior art, which is thus attached to the housing in a loss-proof manner and which can be easily and without tools mounted or dismantled on the housing, which is floating in the housing in the mounted state and at Can be opened as easily and trouble-free as possible. Furthermore, there is a need for a dust protection cover which, when dismantled, prevents unintentional dismantling / disintegration into individual parts and thus prevents the loss of individual parts, especially in field use.

The object of the invention is thus to provide a loss-proof dust cover with simple assembly. It is the aim and object of the invention to create such an optimized, reliable, loss-proof and easy-to-assemble dust protection cover.

According to the invention, these objectives are achieved in that a dust protection cover of the type mentioned at the beginning has the features specified in the characterizing part of claim 1. In other words, the dust cover has a guide extension on the spring-loaded pin, which is connected to a guide groove and an insertion groove formed parallel to the axis of rotation of the pin, which lies within a first socket and extends from the outer end of the socket to the guide groove and is connected to the guide groove is, cooperates.

The solution according to the invention enables the dust protection cover to be mounted on the housing in a manner that is secured against loss, as well as a loss-proof mounting position of the pin. Easier and tool-free assembly of the dust cover and simple and tool-free assembly of the dust cover on the housing are also possible. The invention also has the advantage of low manufacturing costs. In addition, bending of the pin during assembly or disassembly is avoided. This not only has a positive effect on the life of the pen, but also avoids additional friction when opening or closing the dust cover and thus prevents possible jams.

Numerous configurations are possible, so it can be provided that the pin is only mounted and / or spring-pretensioned within the first socket.

Another aspect of the invention relates to the fact that the guide groove formed in the first socket has two legs arranged essentially in an L shape, one leg being formed parallel to the axis of rotation of the pin and a second leg being formed in the direction of rotation.

Furthermore, it can be expedient for the pin to be partially received in the second socket and to be axially pretensioned in the direction of the first end with a spring.

An embodiment is advantageous in which the guide extension on the pin strikes an end stop of the guide groove, thereby limiting the axial movement of the pin in the first socket.

Furthermore, it can be provided that the guide groove has an assembly notch which allows the guide extension of the pin to be locked in the assembly position, that is to say when the pin end is completely retracted into the first socket.

In addition, it can be provided that the guide extension is connected to the pin in a fixed manner or can be dismantled again, or is formed integrally on the pin.

In particular, it can be advantageous that a cover extension for receiving in a second bearing of the housing is formed on the second socket.

According to a particular embodiment, it is possible that the second socket has a second hole with a diameter D2, wherein the second hole at the second end can have a tapered diameter D3 or can be designed as a blind hole.

Furthermore, it can be useful to arrange a pin spring in the second socket.

In addition, it can be advantageous for an end pin to be arranged in the second socket.

It has proven to be particularly advantageous if the dust protection cover has sealing lips which are designed essentially complementary in shape to the ejection opening and enable an improved and gap-free closing of the dust protection cover and center the dust protection cover in the bearing in the housing.

Furthermore, it can be provided that the dust protection cover comprises a cover bay which is designed to be complementary in shape to an arm of a cover spring in order to interact with this arm and to transmit the spring force to the dust protection cover.

Through the end stop of the guide groove, the defined force of the spring preload of the pin is diverted to the dust cover and is not in transferred in the axial direction to a bearing. With this construction, a floating mounting of the dust cover in the housing is achieved and thus the easiest and most trouble-free opening of the ejection opening if necessary. The bearings in the housing, in turn, can be implemented, for example, by short bores; no complex bearings to be produced are necessary.

Another aspect of the invention relates to the shape of the guide groove. One leg is formed essentially parallel to the pin axis, a second leg in the direction of rotation of the pin axis. A mounting notch is designed for easier assembly, locking the guide extension in the assembly notch leads to the assembly position in which the pin end is fully retracted into the first socket and thus allows easy assembly and disassembly of the dust cover on the housing. In this assembly position, the dust cover is secured against unintentional dismantling / disintegration into its individual parts and thus against possible loss of individual parts. This is particularly advantageous in the field.

An end pin arranged in the second socket, possibly made of a stronger material than the dust cover, enables the extension of the cover to be stiffened and the spring force to be better transferred into the dust cover, without excessive material stress, especially in the case of designs and combinations of metal springs and a plastic dust cover.
The axial spring preload of the pin is preferably achieved by means of a pin spring arranged in the second socket

• die Fig. 1 einen erfindungsgemäßen Staubschutzdeckel am Gehäuse im geöffneten Zustand,
• die Fig. 2 den Staubschutzdeckel der Fig. 1 in perspektivischer Ansicht,
• die Fig. 3 den Staubschutzdeckel der Fig. 1 in einer Explosionsdarstellung,
• die Fig. 4 den Staubschutzdeckel der Fig. 3 in einer Explosionsdarstellung in einer anderen Perspektive,
• die Figs. 5 a,b den Querschnitt des Staubschutzdeckels an den Buchsen und eine Detailansicht und
• die Figs. 6 a,b schematische Darstellungen mögliche Ausführungsformen der Führungsnut.

The invention is explained in more detail below using an exemplary embodiment. It shows or shows, purely schematically:

• the Fig. 1 a dust cover according to the invention on the housing in the open state,
• the Fig. 2 the dust cover of the Fig. 1 in perspective view,
• the Fig. 3 the dust cover of the Fig. 1 in an exploded view,
• the Fig. 4 the dust cover of the Fig. 3 in an exploded view from a different perspective,
• the Figs. 5 a, b the cross section of the dust cover on the sockets and a detailed view and
• the Figs. 6th a, b schematic representations of possible embodiments of the guide groove.

It is clear to a person skilled in the art that symmetrical embodiments are possible without any problems and can be read quietly both in the description of the figures and in the claims.

The terms left, right, up, down, front and back in the following always refer to the firearm from the point of view of the firearm when it is held ready to fire. This means that in the weapon the muzzle of the barrel is "in front", that the breech or slide is moved "backwards" by the explosion gases, etc. Transverse to a direction essentially means a direction rotated by 90 °. The weapon has, going through the barrel axis and oriented vertically, a weapon center plane, which cum grana salis, forms its plane of symmetry.

In the Figures 1 to 6 Embodiments of the invention are primarily shown which are suitable for use in a rifle of the AR15 or M4 type. Modifications of the examples shown can, with knowledge of the invention, also be applied to other types of rifles and firearms by the person skilled in the art simply and without extensive or complex experiments. Any other combination of the technical features of the individual figures shown and their different forms of expression are also easily possible for the person skilled in the art with knowledge of the invention.

The Fig. 1 shows a dust protection cover, in the following mostly only called cover 6 for short, in the installed and open, folded-down state. The cover 6 is mounted on a first bearing 28 and a second bearing 29 of a frame 1 of a firearm (firearm) and is located in the example shown in the area between trigger 3, magazine shaft 4 including magazine 5 and the upper end of frame 1, in the illustrated example Exemplary embodiment with a mounting rail 3. A lid spring 9 is also visible, which preloads the lid so that it is opened when it is opened can fold away from the closed position about the axis of the pin 10 down to the open position. The first bearing 28 and second bearing 29 lie on / in the housing corresponding to the axis of the pin 10. The open cover 6 exposes the ejection opening 7, behind which a part of a closure can be seen.

If the dust protection cover 6 is in the closed state, a cover projection 17 protrudes into the movement path of the closure. When a shot is fired, the suddenly released high energy drives the projectile forward out of the muzzle, but at the same time part of the energy is directed towards the breech and thus causes the rearward movement of the breech. The rearward sliding closure then touches the cover projection 17 and presses it outward with sufficient force so that the resiliently mounted pressure piece 8 located in a catch 22 of the cover projection 17 yields and is pressed out of the catch 22. The cover 6, which is pretensioned by the cover spring 9, accordingly folds downwards into the open position and clears the way for the cartridge case to be ejected and this can be ejected without any obstacles. The cover 6 subsequently remains open due to the spring force of the cover spring 9 and is only closed again by, for example, manual intervention.

The cover 6 can easily be removed from the housing 1 by moving the pin 10 on a guide extension 11 along a guide groove 12 in the axial direction, parallel to the barrel axis, towards the center of the dust protection cover 6. As a result of this movement, the pin end 13 engaging in the first bearing 28 is pulled out of the latter, and the cover 6 can be removed. A more detailed explanation of the function of the pin 10 with the guide extension 11 and the guide groove 12 is given below.

The Fig. 2 shows an embodiment of the cover 6 according to the invention in the assembled, but not mounted on the housing 1 state and is with the Figs. 3 and 4th , which show the cover 6 in an exploded view from different viewing directions, discussed together. The dash-dotted line represents the axis of the pen 10 ( Fig. 2 ); with the direction of the arrows this gives the cutting plane VV of the in Fig. 5 shown section. The cover is largely flat and elongated and, as shown, preferably has at least one sealing lip 16 and one protruding cover projection 17. The sealing lip 16 causes an improved and gap-free closing of the ejection opening 7, whereby the penetration of dust, dirt and moisture into the interior of the firearm is particularly well prevented. Due to the interaction of the sealing lip 16, which is largely complementary in shape to the ejection opening 7, the dust protection cover 6 is also axially centered in the bearings 28 and 29 in the closed state, which enables the cover 6 to be opened more easily and without friction. Furthermore, increased friction around the ejection opening 7 of the frame 1 can be brought about by the sealing lip 16, whereby a movement of the closed cover relative to the frame 1 and thus a possible rattling can be prevented.

In the embodiment shown, a resilient pressure piece 8 in a corresponding pressure piece bore 18 ( Fig. 3 ) attached. In the closed state, a ball of the resilient pressure piece is spring-loaded in the catch 22 of the frame and prevents unintentional opening of the cover 6.

A first socket 24 and a second socket 25 are formed along a longitudinal side of the cover 6. The longitudinally outer end of the first bushing 24 is referred to below as the first end. The other outer end in the longitudinal direction of the second bush 25 is referred to below as the second end. The second socket 25 can be designed as a “solid body”, the bearing and, in a further variant, also the spring preloading of the pin 10 taking place within the first socket 24.

The second socket 25 has an essentially cylindrical cover extension 23 at the second end. Depending on the material and embodiment of the dust protection cover 6, the first and / or second bushing 24, 25 can be designed differently, but they are to be seen as a joint that can be rotated about a common axis. Possible embodiments are, for example, bent or rolled sheet metal strips into cylindrical rolls, or, if they are, for example, made from solid or made by injection molding, elongated, thickened, Put. The hole formed in the first bush 24 is designated as the first hole 20, and the second hole 21 is formed in the second bush 25.

The first hole 20 has at least a diameter D1 (see also FIG Fig. 5 ). The second hole 21 has a diameter D2 that is either the same size as or smaller than D1 (D2 <D1), but at the second (outer) end it can have a tapered diameter D3 after a step or gentle transition ( Fig. 5 ). The second hole 21 can also be designed as a blind hole and only partially protrude into the second socket 25, but in a preferred and illustrated embodiment, the second hole 21 is formed over the full length of the second socket 25 with a cover extension 23, particularly preferably with the already described tapering of the diameter at the outer end.

As in particular in Figs. 2 and 4th As can be seen, the first bushing 24 has an insertion groove 26 located on its inside and aligned parallel to its axis, which, beginning at the first end, extends to a guide groove 12 and merges into it. In the embodiment shown, the guide groove 12 is L-shaped, a first leg 31 being oriented essentially parallel to the axis of the pin 10 and being approximately normal to a second leg 32. The guide groove 12 protrudes completely through the first bushing 24 in the radial direction up to the first hole 20 and thus forms a radial opening in the first bushing 24.

In addition to the in Figs. 2-4 The substantially L-shaped design of the guide groove 12 shown in the figure, other variants are also possible; further exemplary embodiments are described below and in FIG Fig. 6 shown purely schematically. The length of the first leg 31 is in the range from 1/10 to 3/4 of the length of the first socket 24, preferably in the range from 1/5 to 1/2.

A spring recess 19 is located between the first and second bushes 24 and 25. The cover spring 9 is preferably designed as a leg or torsion spring with two arms. The spiral of the cover spring 9 can be penetrated by the pin 10 in the assembled state, as shown, in order to mount the cover spring 9 in the axial direction of the pin 10. The pin 10 can support up to or partially in the second socket 25 protrude. In the assembled state, one arm of the lid spring 9 lies in the spring bay 27, the second arm lies against the housing 1; the spring pushes the cover 6 into the OPEN position ( Fig. 1 ).

In the assembled state, the pin 10 lies in the first socket 24, penetrates (it protrudes from the spring on both sides) the spring recess 19 and the spiral of the lid spring 9 and partially protrudes into the second socket 25. The pin end 13 protrudes at the first end out of the first bushing 24 and can, as shown, protrude into the first bearing 28 in the housing 1.

A guide extension 11 can be permanently or detachably connected to the pin 10 or also be integrally formed on the pin 10 or. The guide extension 11 lies in the guide groove 12 and is pressed with the pin 10 by the bias of a spring element against the end stop 33 of the guide groove 12 and thus limits the possible movement of the pin 10 in the direction of the first end 13. The end stop 33 maintains the defined force the spring preload within the cover and is not transmitted to other components, in particular to the first and second bearings 28 and 29.

By applying a slight force on the guide extension 11 in the direction of the second end, e.g. by pulling or pushing with a finger, the pin 10 can be pushed in the direction of the second end against the spring preload. As a result, the pin end 13 can be completely withdrawn into the first socket 24; this position is referred to below as the assembly position. The position in the assembled state of the pin 10 with the guide pin 11 abutting against the end stop 33 is referred to as the end position.

In the embodiment shown, the spring preload of the pin is generated by a pin spring 14 arranged in the second bushing 25 and designed as a spiral spring, but other variants are also possible. The pin spring can, for example, be arranged partially or entirely in the spring recess 19. Variants with a pin spring 14 arranged in the first bushing 24 are also conceivable, with both the first bushing 24 and the pin 10 having a corresponding taper in such embodiments. But there are also variants entirely without a separate pen spring 14 possible, for example this spring preload can be brought about by a correspondingly shaped cover spring, which acts as a torsion spring and an axial spring at the same time.

In a preferred, illustrated embodiment, the cover 6 can comprise an end pin 15 which, in the installed state, lies in the second end of the second bushing 25 and which is designed to complement the tapered end with diameter D2 and D3 of the second hole 21. In a preferred embodiment, the end pin 15 can be made of a harder and / or more rigid material than the dust cover in order to obtain additional stability compared to the pin spring 14 and / or the cover extension 23 and / or the second bearing 29. Material combinations include, for example, materials made of plastic, metal, ceramic or composite materials. Designs with a permanently connected end pin 15, e.g. glued in or overmolded in the manner of a lost core, or with a loose and removable pin end 15 are possible. However, designs without an end pin 15 are also possible.

In a preferred embodiment, the cover 6 can comprise a pin spring 14, which can lie, for example, between the end pin 15 and the part of the pin 10 protruding into the second socket 25. The pin spring can be firmly connected to the pin 10 and / or the end pin 15 or can be made loose. The pin spring 14 may be partially arranged around a tapered portion of the pin 10 and / or the end pin 15. In the preferred embodiment shown, the end pin 15 is pressed in the direction of the second end by the spring force of the pin spring 14.

The assembly of the cover according to the invention takes place easily and without tools. First the end pin 15 and then the pin spring 14 are inserted from the spring recess 19 into the second socket 25. The cover spring 9 is then brought into its position in the spring recess 19 and the pin 10 is pushed from the first end in the direction of the second end through the first socket 24, the guide extension 11 being guided by the insertion groove 26. The pin 10 is pressed towards the second end until the guide extension 11 reaches the end of the insertion groove 26 and thus the guide groove 12. The pin 10 now rotates about its own axis along the second leg 32 of the guide groove 12 up to the guide extension 11 reaches the first leg 31 of the guide groove 12. An axial movement of the pin 10 with the guide extension 11 now takes place in the direction of the first end. This movement ends when the guide extension 11 strikes the end stop 33 of the guide groove 12. The pin 10 then passes through the spring recess 19 together with the cover spring 9 and rests partly in the second socket 25 when the guide extension 11 has reached the end stop 33 and thus the end position.

In the end position, the guide extension 11 lies in the first leg 31 of the guide groove 12. By applying a slight force in the direction of the second end, e.g. by pulling or pushing with a finger on the guide extension 11, the pin 10 can counter the spring preload, in the example shown against the spring force of the pin spring 14, can be pushed in the axial direction towards the second end. As a result, the pin end 13 can be withdrawn into the first socket 24 and thus brought into the assembly position. This makes it easy to remove the cover 6 without having to be completely dismantled.

If it is necessary to completely dismantle the cover according to the invention, this can be done just as easily and without tools. The pin 10 is first brought into the assembly position by pulling or pressing on the guide extension 11, then the guide extension 11 is moved further along the guide groove 12 in the direction of the insertion groove 26 by turning. As soon as the guide extension 11 reaches the insertion groove 26 and thus the dismantling position, the spring preload causes the pin 10 to move axially in the direction of the first end. The pin 10 can be removed and the cover 6 completely dismantled.

The dust protection cover 6 according to the invention can accordingly be mounted or dismantled on the housing very easily and simply without the aid of tools. First, the assembly position is reached by pushing or pulling the guide extension 11 in the direction of the second end. Then the cover extension 23 is positioned in the second bearing 29 of the housing 1 and the first bushing 24 is aligned next to the first bearing 28. Now the pressure or tension on the guide extension 11 can be ended and the assembly position ended, the pin 10 moves automatically in the end position. The pin end 13 moves out of the first socket 24 into the first bearing 28 and the cover 6 according to the invention are thus mounted on the housing in a loss-proof manner. The removal of the cover 6 takes place just as easily with the opposite sequence as described above.

In the end position, the pin end 13 does not exert any force directed outward in the axial direction on the bearing 28, due to the contact of the guide extension 11 on the end stop 33, since it is deep enough. For the same reason, the cover extension 23 also does not exert an outwardly directed force on the bearing 29, so that the cover 6 can be said to be floating. This storage is gentle on the material in terms of wear and tear and a particularly easy opening of the cover 6 without inhibitions is promoted. This storage and the described mechanism also make it particularly easy to install and remove the cover, even in the field and in adverse weather conditions.

The cover according to the invention represents a construction which prevents the pin 10 from bending, for example when it is mounted on the housing 1. The spring preload of the pin 10 represents both a loss protection of the dust protection cover 6 mounted on the housing 1 and a loss protection of the pin 10 in the cover 6 when it is removed from the housing.

The Fig. 5 shows the cover in cross section on the first and second bushing 24 and 25 along the axis of the pin 10. For the sake of clarity, the pin 10, the pin spring 14 and the end pin 15 are not shown. The insertion groove 26, which is formed on the inside in the first socket 24 parallel to the axis of the pin 10, can be clearly seen. It begins at the first end of the first bushing 24 and extends to the second leg 32 of the guide groove 12, which is formed in the circumferential direction with respect to the pin axis. Together with the guide groove 12, it forms an essentially U-shaped groove system in which the guide extension 11 is guided and supported becomes. The diameter D2 of the second hole 21 and the tapered diameter D3 at the outer end of the second socket 25 and at the lid extension 23 are particularly clearly visible. The diameter D1 of the first hole 20 is also clearly visible, which is either the same size as D2 or greater than D2 is.

According to the invention, other designs than the previously described L-shape of the guide groove 12 are also possible. Figs. 6a , b show examples of such possible deviating variants; The insertion groove 26 is indicated by dashed lines, the essentially U-shape can be clearly seen. In Figure 6a In addition to the L-shaped version with the end stop 33, first leg 31 and second leg 32, a version with a rounded second leg 32 and a variant with an acute angle between the first and second legs 31 and 32 can be seen. Further variants, such as with a V-shaped second leg 32, are also conceivable. The Figure 6b shows possible exemplary variants of the guide groove 12 that have an additional assembly notch 30. This assembly notch 30 allows the guide pin 11 to be locked into the assembly position for the purpose of easier assembly or disassembly of the cover 6, the assembly notch 30 being positioned such that the pin end 13 is completely retracted into the socket 24. The pin 10 is secured against loss in the assembly position, unintentional removal of the pin 10 from the cover 6 is prevented.

A mounting bracket 30 can be attached, for example, to the part of the guide groove that is parallel to the axis of the pin 10, that is to say to the first leg 31 as a branch, for example in a Y-shape or T-shape. The assembly notch can also be designed on the second leg 32 of the guide groove, for example as a T-shaped junction, but other notch-forming formations of the second leg 32 are also possible, as exemplified in FIG Figure 6b shown, as a W-shape or in the form of a U or V standing on the head. Other rest-forming shapes shown are steps and spikes.

The dust protection cover 6 according to the invention can be produced from all materials used in the prior art for such covers, for example largely from plastic or metal. Of course, different combinations of plastic, metal, ceramic or composite material are also possible; knowing the invention, it is easy for a person skilled in the art to make a suitable selection here.

The lid according to the invention can be produced, for example, by means of machining processes such as milling, turning or grinding, and the lid according to the invention can also be produced using shaping processes such as injection molding, extrusion or MIM, or by means of additive manufacturing processes such as 3D printing or a combination this or other procedures.

The invention is not limited to the embodiments shown in the figures, but also includes other variants, in particular with regard to the shape and position of the insertion groove and guide groove or the number and design of the sockets and the holes formed therein and the corresponding shape-complementary design of pins and end pins.

It should also be pointed out that in the description and the claims, statements such as "lower area" of an object, the lower half and in particular the lower quarter of the total height, "lowest area" means the lowest quarter and in particular an even smaller part; while "middle area" means the middle third of the total height. This applies mutatis mutandis to the terms "width" and "length". All of this information has its common meaning, applied to the intended position of the object in question.

In the description and the claims, "essentially" means a deviation of up to 10% of the specified value, if it is physically possible, both downwards and upwards, otherwise only in the meaningful direction, for degrees (angle and temperature) this means ± 10 °. When there are terms such as "essentially constant" etc., what is meant is the technical and not the mathematical possibility of deviation on which the person skilled in the art is based. For example, an “essentially L-shaped cross section” comprises two elongated surfaces which merge at one end into the end of the other surface and whose longitudinal extension is arranged at an angle of 45 ° to 120 ° to one another.

All quantities and proportions, in particular those used to delimit the invention, unless they relate to the specific examples, have a tolerance of ± 10% to understand, thus for example: 11% means: from 9.9% to 12.1%. In terms such as: "a solvent", the word "a" is not to be seen as a numerical word, but as an indefinite article or as a pronoun, unless the context indicates otherwise.

Unless otherwise stated, the term: “combination” or “combinations” stands for all types of combinations, starting from two of the constituents in question up to a large number or all of such constituents, the term: “containing” also stands for “consisting out".

The features and variants specified in the individual configurations and examples can be freely combined with those of the other examples and configurations and used in particular to characterize the invention in the claims without necessarily including the other details of the respective configuration or the respective example

To make the invention easier to understand, the English terms, which can also be used as synonyms, are given in the following list of reference symbols. List of reference symbols: 1 Frame (receiver) 18th Catch bore 2 Trigger 19th Spring bore 3 Mounting rail 20th first hollow cylinder 4th Magazine well 21 second hollow cylinder 5 Magazine 22nd Rest (recess) 6th Dust cover 23 Cover protrusion 7th Ejection window 24 first bushing 8th spring biased catch 25th second bushing 9 Cover spring 26th Insertion notch 10 Pin 27 Spring recess 11 Guide protrusion 28 first bearing 12th Guide slit 29 second bearing 13th Pin end 30th Assembly recess 14th Pin spring 31 first arm 15th Butt pin 32 second arm 16 Sealing lip (seal) 33 End stop (stop) 17th Cover nose

Claims (16)

Dust protection cover for a present firearm, comprising a first socket (24) and a second socket (25), a pin (10) guided in the first socket (24) with a pin end (13) and a cover spring (9),
characterized in that
the pin (10) is received spring-preloaded in the axial direction at least in the first bushing (24) and
a guide extension (11) is formed on the pin (10) to interact with a guide groove (12) and an insertion groove (26) of the first bushing (24),
that furthermore the insertion groove (26) is formed parallel to the axis of rotation of the pin (10) on the inside of the first bushing (24), begins at the outer end of the bushing (24) and ends at the guide groove (12) and with the guide groove (12) connected is. Dust cover according to claim 1, characterized in that the guide groove (12) is essentially L-shaped and a first leg (31) of the guide groove (12) parallel to the axis of rotation of the pin (10) and a second leg (32) in the direction of rotation (Circumferential direction) is formed. Dust protection cover according to claim 2, characterized in that the first leg (31) in the axial direction of the pin (10) has a length in the range from 1/10 to 3/4 of the length of the first socket (24), preferably from 1/5 to 1/2. Dust protection cover according to one of the preceding claims, characterized in that the pin (10) is partially received in the second socket (25). Dust protection cover according to one of the preceding claims, characterized in that a pin spring (14) for applying the pretensioning force to the pin (10) in the axial direction is arranged inside the second bushing (25). Dust protection cover according to one of the preceding claims, characterized in that the guide groove (12) by the impact of the guide extension (11) at an end stop (33) of the first leg (31) of the guide groove (12) limits the axial movement of the pin (10) in the first bushing (24), the end stop (33) being closer to the first end than the second Leg (32) is formed. Dust protection cover according to one of the preceding claims, characterized in that the guide groove (12) has at least one assembly notch (30) for temporarily locking the guide extension (11) of the pin (10) in an assembly position. Dust protection cover according to one of the preceding claims, characterized in that the guide extension (11) is connected to the pin (10) in a fixed manner or so that it can be dismantled. Dust protection cover according to one of the preceding claims, characterized in that the guide extension (11) is formed integrally on the pin (10) Dust protection cover according to one of the preceding claims, characterized in that a cover extension (23) for receiving in a second bearing (29) of the housing (1) is formed on the second socket (25) at a second end. Dust protection cover according to one of the preceding claims, characterized in that the second socket (25) has a second hole (21) with a second diameter D2. Dust protection cover according to Claim 11, characterized in that the second hole (21) in the axial direction in the direction of the cover extension (23) has a diameter D3 which is smaller than D2. Dust protection cover according to one of Claims 11 or 12, characterized in that the second hole (21) is designed as a blind hole Dust protection cover according to one of the preceding claims, characterized in that an end pin (15) is arranged in the second end of the second socket (25) in direct connection with a pin spring (14). Dust protection cover according to one of the preceding claims, characterized in that at least one sealing lip 16 is formed on the dust protection cover (6), which is formed essentially complementary in shape to an ejection opening (7) of a frame (1). Dust protection cover according to one of the preceding claims, characterized in that the dust protection cover (6) has a spring recess (27) which is designed to be complementary in shape to an arm of a cover spring (9).

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