This patent relates generally to rotary lug breeches and, more specifically, to rotary lug breeches and weapons including such rotary lug breeches.
Rotary lug breeches safely secure a cartridge in a cartridge chamber of a muzzle and/or barrel prior to releasing a shot. To secure the base of the cartridge, a head is introduced into a bolt head and/or receiver and secured there by a rotational motion and/or interaction with a mounting socket and/or lugs. The locking lugs are radially disposed inwards of the receiver.
To retain the cartridge to be fired, breech lugs pass through and past gaps between the locking lugs in the bolt head toward the cartridge chamber. Bolt gaps are also formed that correspond to the locking lugs and/or rows of locking lugs of the bolt head through which the bolt can pass after the bolt has been inserted into the bolt head. To lock the breech, the bolt is subsequently rotated in the receiver to place the breech lugs rearwards of the locking lugs. Specifically, with the subsequent rotational motion of the bolt in the receiver, end rearward facing surfaces of the breech lugs are in front of end forward facing surfaces of the locking lugs.
With the cartridge secured, the cartridge may be fired and the resulting recoil forces directed through the impact base, the bolt, the breech and locking lugs to the receiver rigidly connected to the barrel. Directing the recoil forces through the impact base, the bolt, the breech and locking lugs to the receiver substantially prevents the breech from moving backwards in an undesired manner immediately after firing a shot.
With automatic weapons in which new ammunition is introduced via a breech configuration and/or assembly without manual reloading, the bolt is normally located in a bolt carrier. The bolt carrier is pushed forwards by a breech spring and, as a result of recoil effects, is rearwardly pushed by a propellant gas and rod (e.g., piston assembly) against the effect of a breech spring. The rotational motion for locking and releasing the bolt is obtained by a gate control (e.g., a slot). Based on movement of the bolt and/or bolt carrier, the gate control controls the relative movement and/or rotational movement of bolt and/or bolt carrier. Mauser MG 34, the MG4, and the SLB 2000 from Heckler & Koch, the assignee of the present patent, include rotatory lug breeches. Other rotary lug breeches are described in DE 196 00 459 or EP 0 188 681.
CH 51131 A1 describes a straight pull breech having locking lugs that include pitched breech surfaces that slide along corresponding locking niches on side walls. As the breech unit is released, the empty cartridge shells are also released.
DE 419803 A describes a recoil-control rotary lug breech in which rotational motion of the locking lugs are transferred to linear motion via a curved surface.
DE 196 00 459 A1 describes a rotary head breach in which the bolt has two rows of breech lugs lying in a row along the longitudinal axis. The lateral flanks of the breech lugs define a high-pitch thread along the longitudinal axis of the breech. There may be twelve lugs per row. Thus, in releasing and locking the bolt in the receiver, an interaction of the breech and locking lugs causes an additional rotational bolt motion, which locks or releases a control pin from a safety groove. The bolt is also provided with diagonal locking lugs. The safety groove runs radially or in a circumferential direction of a guide sleeve (e.g., bolt carrier).
U.S. Pat. No. 2,364,548 describes a gas-pressure operated rotary head breech in which two locking pins of the bolt and two L-shaped locking grooves and/or pockets in the receiver form a bayonet mount. The compulsory guide of the locking pins at the control surfaces enable corresponding guide surfaces in locking pockets of the receiver to have relatively high tolerances.
U.S. Pat. No. 2,775,920d describes a rotary breech head in which rotational motion of a bolt is initiated by relative motion between the bolt carrier and the bolt in the longitudinal direction. The relative motion is enabled by corresponding guide grooves and guide tracks provided with a pitch. The rotational motion is completed by inertia of the rotating bolt in the receiver. A screwing motion of the bolt is substantially prevented.
EP 0 188 681 describes using a rotary bolt having two rows of breech lugs lying behind one another in the longitudinal axis and the recoil effects of an advancing rotary lug breech toward a radial annular surface at a rear edge of the barrel to the breech lugs. The edges of the breech surfaces are rounded. As seen from the perspective of the shooter, the right-hand edge of the bolt surfaces are beveled. Beveling the bolt surfaces creates a safety clearance for the recoiling breech surfaces.
Rotary lug breeches are also used in machine guns in which the breech carries out propulsion functions including loading ammunition from a cartridge belt, removing and reliably discarding empty, fired cartridge shells and transporting the ammunition belt with cartridges relative to the firearm and/or breech. When the machine gun is cycled, substantial masses are moved back and forth in the weapon in the direction of firing and transverse to the direction of firing. The direction of firing is in the direction of the bore axis and the direction transverse to the direction of firing is in the direction of the operation of the cartridge belt feed. In cycling, the bolt rotationally moves back and forth quickly. If the firearm is fired at a higher cadence, substantial longitudinal, transversal and/or rotational accelerations occur that limit the aiming precision and cause manually loaded machine guns to stray when fired. If the firing cadence is reduced, thereby reducing the breech speed and/or acceleration, the operational forces needed to reload and feed ammunition may no longer be readily applied causing the weapon to fail.
a-6i and 6k depict schematic representations of different positions of an example breech lug and associated control pin during the locking and unlocking process.
a depicts a detailed view of an example head of the bolt of area ‘Y’ of
Certain examples are shown in the above-identified figures and described in detail below. In describing these examples, like or identical reference numbers are used to identify the same or similar elements. The figures are not necessarily to scale and certain features and certain views of the figures may be shown exaggerated in scale or in schematic for clarity. Additionally, several examples have been described throughout this specification. Any features from any example may be included with, a replacement for, or otherwise combined with other features from other examples. Further, throughout this description, position designations such as “above,” “below,” “top,” “forward,” “rear,” “left,” “right,” etc. are referenced to a firearm held in a normal firing position (i.e., wherein the “shooting direction” is pointed away from the marksman in a generally horizontal direction) and from the point of view of the marksman. Furthermore, the normal firing position of the weapon is always assumed, i.e., the position in which the barrel runs along a horizontal axis.
The examples disclosed herein relate to breech assemblies for use with a firearm and/or machine gun having a gas pressure loader. The example breech assembly may be a rotary lug breech having a bolt carrier and a bolt located therein. The bolt may include a plurality and/or numerous breech studs and the receiver may include a plurality and/or numerous locking lugs.
The example breech assembly disclosed herein substantially reduces actuation, guidance and/or control forces to enable firearms and/or machine guns to have a smooth firing characteristic and/or cadence. Thus, using the examples disclosed herein, firearms and/or machine guns may have an improved hit ratio and increased aiming precision. In some examples, the examples disclosed herein reduce acceleration and actuation forces acting on a rotary lug breech, thereby improving performance.
Some of the components of the examples disclosed herein are depicted in
An example breech assembly 150 includes a bolt carrier 1 and a gas tube, piston rod and/or rod 2 that connects a front end of the bolt carrier 1 to a gas intake (e.g., a tap at the barrel) of a weapon (e.g., firearm, machine gun, etc.). When the firearm is fired, gas pressure received via the gas intake acts on the end of a piston 4 and urges and/or moves the bolt carrier 1 via the piston rod 2. Movement of the piston rod 2 moves and/or actuates the bolt carrier 1 and/or pushes the piston 4 and/or the bolt carrier 1 in a housing, casing and/or body 6 (
In this example, the body 6 is formed by two body casings, body portions and/or elements 8 and 10. The body portions 8 and 10 include interior lower and upper guide tracks 12, 14, 16 and 18 that guide movement of the bolt carrier 1 as the bolt carrier 1 moves during the loading and/or unloading process (e.g., moves back and forth relative to the body 6).
To guide the bolt carrier 1 horizontally along a bore axis 24 (
An intermediate space, aperture and/or groove 21 between the first and second grooves 20 and 22 enables the bolt carrier 1 to be guided with relatively low friction and without sensitivity to contaminants. In this example, as the bolt carrier 1 moves relative to the body 6, the first and second guide grooves 20, 22 and the lower guide tracks 12, 14 interact in a claw-like manner to substantially remove contaminants from the guidance region, thereby reducing friction between the guide surfaces of the guide grooves 20, 22 and/or the guide tracks 12, 14. The first and second guide grooves 20 and 22 are provided in pairs at the front and rear ends of the bolt carrier 1 to substantially prevent the bolt carrier 1 from tilting relative to the body 6 during the loading and/or unloading process and/or to support the bolt carrier 1 along the entire length of the body 6, for example.
In some examples, a breech guide and/or guidance device 30 is positioned at an upper rear end of the bolt carrier 1. The breech guide 30 includes a guide shaft, elongated member, shaft and/or element 32 forming a carrier component that receives and/or accommodates a control and/or first roller 34 and a guide and/or second roller 36. The first roller 34 is positioned at an upper end of the guide shaft 32 and acts as a control component. The guide shaft 32 passes through the second roller 36. The second roller 36 acts as a guide component that is axially inserted into a lateral recess 26 of the bolt carrier 1. The second roller 36 is rotationally coupled to the guide shaft 32 and extends over portions and/or sides of the bolt carrier 1.
In some examples, the guide shaft 32 and the first and second rollers 34, 36 are coaxially aligned and/or positioned relative to an axis of symmetry 33 that runs perpendicularly relative to the bore axis 24. The guide shaft 32 is axially displaceable in a receptor opening and/or retaining aperture 38 of the bolt carrier 1. The guide shaft 32 is biased by a spring 40 and is movable against a force of the spring 40 into and/or relative to the retaining aperture 38.
In some examples, the axial positioning path and/or travel range of the guide shaft 32 is defined by a recess, slot and/or aperture 42 (
In some examples, the first roller 34 engages in a U-shaped guide gate, cam and/or curved lever 50 (
The rollers 34, 36 may be spherical rollers to substantially ensure smooth guidance of the bolt carrier 1 relative to the body 6. In some examples, if the first arm 52 applies a left acting force on the right side of the first roller 34 via the control flank of the first arm 52, the second roller 36 rests on and/or engages the left upper guide track 16 (e.g., the first and second rollers 34, 36 move in the force direction, to the opposite side and/or to the left).
A smooth guiding function of the bolt carrier 1 relative to the body 6 may be obtained and/or ensured by sizing and/or dimensioning the spacing between inwardly facing surfaces and/or flanks of the upper guide tracks 16, 18 and inwardly facing surfaces and/or flanks of the arms 52, 54 to provide at least some play for the rollers 34, 36, for example. In some examples, surfaces of the rollers 34, 36 substantially ensure a smooth and clean rolling action along the upper guide tracks 16 and/or 18 and/or the arms 52, 54 of the lever 50 even when the bolt carrier 1 is at an angle and/or slightly tilted relative to the body 6 as the bolt carrier 1 advances and retracts. In some examples, the rollers 34, 36 may be at an angle and/or slightly tiled relative to guide flanks and/or surfaces of the upper guide tracks 16, 18 and/or inner flanks and/or surfaces of the arms 52, 54 as the rollers 34, 36 move relative thereto.
In this example, the lever 50 is positioned in and/or adjacent a cover and/or lid 56. The cover 56 may be rotatably coupled and/or rotated and opened in a hinged manner to accommodate an advance mechanism and/or belt feeder mechanism. The guide shaft 32 and the first roller 34 are retractable and/or movable into the bolt carrier 1 to enable the lever 50 to be closed in any arbitrary breech position without damaging the lever 50 and/or the first roller 34. For example, if one of the arms 52, 54 and/or ends of the arms 52, 54 engage the first roller 34, the first roller 34 and/or the guide shaft 32 are received and/or pushed into the retaining aperture 38 of the bolt carrier 1. During the loading motion of the bolt carrier 1 along the bore axis 24, based on being biased by the spring 40, an upper end surface and/or portion of the first roller 34 slides along and/or engages a lower end surface of one of the arms 52, 54 until the first roller 34 is in the track of the lever 50 and/or between the arms 52, 52.
In some examples, to improve the rolling characteristics of the first and second rollers 34, 36, the outer surfaces of the guide shaft 32 and/or inner surfaces of the rollers 34 and/or 36 have relatively smooth surfaces (e.g., through coating, machining, processing, etc.). In some examples, the first and second roller 34 and/or 36 are coupled to the guide shaft 32 by a roller bearing and/or any other suitable coupling. In some examples, roller bearings may be included adjacent the first and second guide grooves 20, 22 to reduce frictional resistance with the guide tracks 12, 14, 16 and 18 as the bolt carrier 1 moves relative to and/or in the body 6. In some examples, instead of including the first and second rollers 34, 36, displaceable control and/or guide components and/or elements may be provided that engage in a sliding manner with guide flanks and/or inner flanks of the lever 50. The guide components may be symmetrical in a folding manner with respect to a plane of symmetry defined by, spanning and/or between the bore axis 24 and the axis of symmetry 33.
The example breech assembly 150 includes a rotary lug breech having an axially displaceable bolt 100. The bolt 100 is rotatably movable between a locked and released position within a guide sleeve and/or aperture 58 on an upper surface and/or portion of the bolt carrier 1. In this example, the bolt 100 includes front and/or first breech lugs and/or studs 104v (
The example breech assembly 150 may be used with open bolt weapons in which the breech assembly 150 is positioned between the ammunition to be loaded prior to firing and, after initiating firing a shot, the breech assembly 150 advances and feeds the ammunition into the ammunition chamber and/or cartridge chamber. After the breech assembly 150 is secured and/or locked, the cartridge is fired.
In some examples, feed projections, studs and/or lugs 108 are positioned at the front end of the bolt 100 at the 12 o'clock position. An ejection slot and/or cartridge ejector slot 110 runs through and/or between the feed projections 108. The feed projections 108 supply cartridges to the firearm and an ejector coupled and/or rigidly positioned on the body 6 discharges the empty, fired cartridge shells from the firearm when the bolt carrier 1 moves backwards. The feed projections 108 enable stable guidance of the cartridges when moving and/or transporting ammunition in the weapon.
In some examples, as shown in
In some examples, the control pin 102 includes a wedge-shaped cross-sectional profile that extends radially outwards and engages in and/or interacts with the slot 60 and/or the first and/or second slot portions 66, 68. To secure and/or substantially prevent the bolt 100 from tilting in the guide sleeve 58, lateral flanks 130 (
In some examples, to remove the bolt 100, an opening, aperture and/or removal window 71 (
In some examples, the bolt 100 defines a firing pin channel 116 (
During the locking procedure, the breech studs 104 on the bolt 100 interact with the locking lugs 204 on the receiver 200. During the locking process, the breech studs 104 may be received through the recesses 202 (
During the unloading and/or releasing process, the bolt carrier 1 moves relative to the bolt 100 and the second slot surface 64 of the slot 60 engages and/or interacts with the control pin 102. The interaction between the slot 60 and the control pin 102 turns and/or rotates the control pin 102 out of the locking position to enable the bolt 100 and the breech studs 104h, 104v to be moved linearly toward the rear of the firearm through the recesses 202 of the receiver 200.
In some examples, to improve the locking and/or releasing of the breech assembly 150, a guide channel 209 (
As shown in
The examples disclosed herein and/or the example breech assembly 150 improves the cartridge extraction procedure by enabling the sequence between unloading and loading the weapon to be accomplished fluidly, smoothly undemanding and/or without imparting substantial loads and/or forces.
a-6k depicts the complete cycling movement that the breech assembly 150 goes through when firing a shot and/or round. The breech studs 104, 104h′, 104v and the locking lugs 204, 204a, 204b are in different positions and/or being twisted and/or rotated relative to and/or towards one another. The corresponding position of the control pin 102 in the slot 60 is shown in crosshatching (e.g., figure to the right).
When firing a shot with the firearm armed, loaded and/or cocked, the breech assembly 150 (e.g., the bolt carrier 1 and the bolt 100) is positioned toward the rear of the body 6. Loaded and/or stressed breech springs are positioned on breech spring guide rods and/or engage in, pass through and/or are adjacent to spring eyes and/or apertures 72 in the bolt carrier 1. The bolt carrier 1 includes sear catches 74 (
As shown in
When locking the breech, as shown in
In some examples, the bolt 100 remains in the unlocked position until the control breech stud 104h′ and/or the first stud surface 132 impacts the cam section 208 (
In some examples, one-sided arrival of the first stud surface 132 of the control breech stud 104h′ at the cam section 208 of the control locking lugs 204b causes the bolt 100 to load on one side and/or deviate in a direction transverse to the bore axis 24 and jam.
In some examples, to substantially prevent the bolt 100 from deviating and/or tilting during the locking and/or loading process, an outer diameter of the cylindrical shaft surface and/or breach head surface 105 (
In the locking process, the rear impact surface 128 of the control pin 102 protrudes from and/or leaves the impact surface 70 of the slot 60. During the locking process, the first slot surface 62 used for locking in the slot 60 engages a corresponding control surface of the control pin 102, which is introduced and/or initiated by the interaction between and/or introduction of the relative motion between the cam section 208 and the first stud surface 132. In some examples, to lock the bolt 100 relative to the receiver 200, the first slot surface 62 interacts with and/or locks against the corresponding control surface of the control pin 102 to twist and/or rotate the bolt 100 further into its locking position.
During the locking process, the cartridge base engages and/or lies entirely on the impact base 126 of the bolt 100 and the extractor 112 snaps into and/or over the corresponding extraction groove on the end of the cartridge.
In some examples, by further rotating the bolt 100, the breech studs 104 arrive in front of and/or are positioned adjacent to the locking lugs 204 and the stud surfaces 106 of the breech studs 104 are positioned adjacent to, in front of and/or behind the lug surfaces 206 of the locking lugs 204. When the breech studs 104 are positioned adjacent the locking lugs 204, the bolt 100 further rotates approximately two thirds of the total rotation.
In some examples, the stud surfaces 106 and the lug surfaces 206 are inclined and/or tilted at a self-locking angle relative to the bore axis 24. The remainder of the locking of the bolt 100 may result from a screwing motion and/or interaction between the breech studs 104 and the locking lugs 204. The surface coupling between the breech studs 104 and the locking lugs 204 may be self-locking such that an axial effect to the bolt 100 does not result in the breech studs 104 shifting from and/or releasing from the locked position.
The locking process described above relates to the pre-control and/or initial locking process and the final and/or definitive locking process. In the initial locking process, the interaction between the cam section 208 and the first stud surface 132 causes the bolt 100 to rotate one third of the total rotation and, in the final locking process, locking the breech 100 occurs in a substantially and/or extremely smooth manner without strong recoil motions. In some examples, the incline and/or interaction between the stud and lug surfaces 106, 206 enables the locking process and reduces inner frictional resistance. In some examples, the incline and/or angle of the cam section 208 corresponds to the incline and/or angle of the first stud surface 132 and the incline and/or angle of the guide section 205 corresponds to the incline and/or angle of the first slot surface 62 to enable locking and/or movement of the control pin 102 and/or the bolt 100 to occur smoothly. In some examples, the angle of the first slot surface 62 relative to the angle of the cam section 208 is selected to enable the rotational acceleration of the bolt 100 to increase during the locking process. In some examples, the angle of the first slot surface 62 is similar to the angle of the cam section 208.
In some examples, the angle of the first slot surface 62 corresponds to the angle of the second slot surface 62 to enable the control pin 102 to move through the entire length of the slot 60 and particularly the first and second slot surfaces 62, 64 with little play.
When firing a shot and discharging a cartridge, as shown in
After firing a shot and/or cartridge, due to the gas pressure acting on the piston 4, the bolt 100 is urged and/or moved backwards toward the rear of the firearm and/or in the direction of the arrows in
When releasing and extracting the cartridge, as shown in
Similar to the locking process, as the bolt 100 is being unlocked, the control breech stud 104h′ is guided by the first stud surface 132 and the second stud surface 111 interacting with the cam section 208 of the locking lugs 204b and the guide surfaces 205 of the locking lugs 204a in the guide channel 209.
In the completely rotated position, the breech studs 104 are aligned with the recesses of the receiver 200 and the control pin 102 engages and/or pushes against a front end of the first slot portion 66. With the extractor 112 grasping the cartridge shell, the bolt 100 is guided rearwardly away from the bolt carrier 1 toward the rear of the firearm (
As the bolt carrier 1 and the bolt 100 move rearwardly, the bolt 100 is positioned adjacent the upper guide tracks 16, 18 and the ejector that extends from the ejector slot 110 pushes the cartridge shell downward through the window, aperture and/or opening 3 of the piston rod 2 and out of the firearm. As the bolt carrier 1 moves further toward the rear of the firearm, the bolt carrier 1 engages a stopping pin and/or stop 76 (
In some examples, the stop 76 is cushioned in the interior of the bolt carrier 1 by a mechanical buffer and/or buffer 78. The buffer 78 may absorb a relatively high degree of mechanical energy using an annular spring and/or biasing element 80 that smoothly absorbs a relatively high portion of the kinetic energy from the breech assembly 150 with limited recoil. Upon releasing the trigger and/or firing the last round from a magazine and/or belt, the breech assembly 150 is secured in the locked position via the sear catch 74.
As set forth herein, the function of releasing cartridges from a cartridge chamber of a barrel is not controlled exclusively by the relative motion between the bolt and the bolt carrier. Instead and as disclosed herein, the cam section 208 of the receiver 200 acts and/or interacts with the first stud surface 132 on the bolt 100.
When releasing the bolt 100, the rotational motion of the bolt 100 is converted into a screwing motion based on the relative motion and/or interaction between the bolt carrier 1 and the bolt 100 and/or between the slot 60 and the control pin 102 in which the first stud surface 132 of the bolt 100 interacts with and/or acts together with the cam section 208 of the receiver 200 to control the screwing motion and/or movement of the bolt 100.
The screwing motion and/or movement of the bolt 100 guides the bolt 100 out of the receiver 200. In the unloading process, the cam section 208 acts as a wedge on which the first stud surface 132 of the bolt 100 rests. During the loading process, the torque and/or movement transferred to the control pin 102 via the slot 60 is converted in part to a traction force and/or used to smoothly and/or easily remove a deformed cartridge shell from a cartridge chamber after firing even if the cartridge is tightly lodged and/or wedged in the cartridge chamber. Before the bolt 100 is positioned in the fully rotated position, the bolt 100 is linearly moved and/or pulled from the bolt carrier 1 rearwardly out of the receiver 200.
Loosening the cartridge from the cartridge chamber enables a fired cartridge to be gently released and/or removed from the cartridge chamber in a linear, decelerated motion. With the appropriate selection and/or configuration of the angle, pitch and/or falling gradient of the cam section 208, the first and second slot surfaces 62 and/or 64 of the slot 60, loosening the cartridge from the cartridge chamber enables, leverage to be generated with increased force that enables even a tightly lodged and/or heavily deformed cartridge shell to be removed from the cartridge chamber.
In some examples, the extractor 112 is substantially protected in its primary function, thereby increasing the useful life of the extractor 112.
The examples disclosed herein enable the extraction force to be smoothly transferred to the cartridge base via the extractor 112, thereby reducing the possibility and/or risk of the cartridge base of a significantly deformed cartridge shell being torn off by the returning breech assembly 150 causing the remaining portion of the cartridge shell to become lodged in the cartridge chamber.
Using the examples disclosed herein, the firing characteristics of firearms implementing the example breech assemblies may be substantially smoother and more reliable. As disclosed herein, to increase the ease of manufacturability, the cam section 208 may be positioned on the locking lug 204 and the first stud surface 132 may be position on the breech stud 132. Thus, the examples disclosed may not include additional structures then may typically be included to enable receiver and/or bolt adjustments.
In some examples, the cam section 208 of the receiver 200 is positioned and/or structured to twist, rotate and/or control the control pin 102 during the locking and/or loading process of the bolt 100. The control section 208 may be structured to enable the impact surface 70 of the slot 60 of the bolt carrier 1 and/or the slot 60 of the bolt carrier 1 during the loading process to exert an angular momentum and/or torque on the bolt 100 via the control pin 102 that turns the bolt 100 relative to the receiver 200 and brings the bolt 100 into its end and/or locking position. The pre-control ability of the example breech assembly 150 increases reliability and/or improves handling characteristics of the weapon.
As disclosed herein, the bolt 100 is axially guided in the receiver 200 via the cylindrical shaft surface 105 in the forward region and/or the inwardly facing head surfaces 203 of the locking lugs 204, which may intercept, absorb and/or substantially prevent the transverse forces acting on the bolt 100 in the loading and/or unloading processes. In some examples, the locking lugs 204 support the bolt 100 such that the bolt 100 is guided without twisting into the receiver 200 and/or the bolt carrier 1 to enable the control, pre-control, loading and/or unloading processes to occur with relatively low internal friction. Thus, even with lower cadences, a sufficient amount of energy is produced via in the piston rod 2 of the breech assembly 150 for the belt transport, the belt removal, feeding ammunition and/or removing and/or discarding shells.
As disclosed herein, the angular momentum and/or torque and/or rotational force of the advancing bolt carrier and/or breech 1 is substantially not transferred to the bolt 100 before the locking procedure. The bolt carrier 1 may be advanced and/or moved relative to the receiver 200 without substantial force on the body 6 of the weapon and/or the guide tracks 12, 14, 16 and/or 18. In some examples, the guide tracks 12, 14, 16 and/or 18 engage in and/or interact with the gaps between the breech studs 104 in the lateral flanks 130 of the bolt 100 to substantially ensure that the bolt 100 is not inadvertently twisted when entering the receiver 200 and/or jam. The interaction between the guide tracks 12, 14, 16 and/or 18 and the breech studs 104 especially in rotary lug breeches having multiple rows substantially ensures that the bolt 100 is entirely insertable into the receiver 200 before being rotated to the locking position therein.
As disclosed herein, the breech assembly 150 substantially optimizes the breech function, the action between the bolt 100 and the receiver 200 and/or between the bolt 100, the bolt carrier 1, the slot 60 and/or the control pin 102.
As disclosed herein, the stud and lug surfaces 106, 206 of the locking lugs 204 and/or the breech studs 104 are angled and/or have a pitch to enable the final locking and/or loading process and/or the primary release and/or unloading process to occur on a helical track having a limited pitch instead of being on a plane. Having the stud and lug surfaces 106, 206 angled and/or pitched enables during the releasing and/or unloading process for a cartridge to be introduced into the cartridge chamber in a reliable manner and for the bolt 100 to be precisely positioned relative to the cartridge chamber. Using the examples disclosed herein, the recoil effects at the end of the locking motion may be reduced. Using the examples disclosed herein, the cartridge may be introduced into the cartridge chamber in a reliable manner and the bolt 100 may be precisely and/or accurately positioned behind and/or relative to the cartridge chamber. Using the examples disclosed herein, the recoil effects at the end of the locking motion may be reduced.
In the unloading and/or releasing process, substantially no restricting frictional effect between the impact base 126 and the cartridge base occurs because the incline and/or angle of the stud and lug surfaces 106, 206 enables during the releasing process the stud and lug surfaces 105, 206 to separate from one another and/or the impact base 126 to be separated from the cartridge base. Using the examples disclosed herein, the bolt 100 can move with the extractor 112 engaging an end of the cartridge shell with the releasing motion substantially unimpeded by frictional forces between the impact base 126 and the cartridge base and/or between the locked and/or interacting stud and lug surfaces 106, 206. More specifically, using the examples disclosed herein, the bolt 100 can arrive at the partially released position before the cam section 208 and the control section of the cartridge shell is removed and/or levered out of the cartridge chamber.
As disclosed herein, the multiple rows of breech studs 104 enables the breech assembly 150 to have a relative compact and slender design and have relatively large locking surfaces on the stud and lug surfaces 106, 206 of the breech studs 104 and locking lugs 204.
As disclosed herein, to further improve guidance of the bolt 100 during locking and/or unlocking, the guide channel 209 is positioned adjacent two locking lugs 204a, 204b and at least partially defined by corresponding surfaces 205, 207a, 208 and/or 207b. During the loading and/or unloading processes, the surfaces 111, 109a, 132 and/or 109b of the control breech stud 104h′ engages in and/or with the surfaces 205, 207a, 208 and/or 207b of the locking lugs 204a, 204b. The interaction between the locking lugs 204a, 240b and the control breech stud 104h′ enables the control breech stud 104h′ to be guided with a predetermined tolerance and/or play relative to and/or in the guide channel 209 and for the breech assembly 150, the bolt 100 and/or the bolt carrier 1 to transition between rotational and axial motion during the locking process and between rotation and axial motion during the unlocking process. In some examples, the breech studs 104 enable the recoil effects during the motion transitions to be neutralized and the flow of motion not to be substantially affected.
In some examples, the guide channel 209 is formed and/or defined by the lateral surfaces 207a, 207b of the locking lugs 204a, 204b, the cam section 208 of the locking lug 204b and the guide surface 205 of the locking lug 204b facing the cam section 208. The guide channel 209 enables the control breech stud 104h′ to be guided in a substantially controlled manner between guide surfaces. For example, the control breech stud 104h′ may be guided between lateral surfaces of the locking lugs 204a, 204b and/or between the cam section 208 of the locking lug 204b and the guide surface 205 of the locking lug 204a. Using the examples disclosed herein, the pre-control motion during locking and the extraction screwing motion (e.g., a lift function) are reliably controlled.
As disclosed herein, the breech lugs 204 improve the guidance effect of the breech assembly 150, for example.
In some examples, the interaction between the control pin 102 and the slot 60 substantially improves the guidance of the bolt 100 in the firearm and/or substantially ensures that the bolt 100 in an extracted breech configuration cannot be inadvertently and/or violently leveraged from its seat, coupling and/or position relative to the bolt carrier 1 to an advanced position that would damage the coupling with the bolt carrier 1.
In some examples, the bolt 100 includes the feed projections 109 separated by the ejector slot 110 on an upper surface of the bolt 100 to enable cartridges to be released from the cartridge belt and transported and/or moved to the cartridge chamber. The extractor 112 may be centrally positioned in the firearm and may advance fired and/or empty cartridge shells downwardly through the ejector slot 110.
As disclosed herein, the locking lugs 204 improve the guidance characteristics of the bolt assembly 150 and/or the bolt 100 in the body 6 and/or substantially prevent inadvertent rotational motion of the bolt 100 when the bolt 100 is outside of and/or at a distance from the receiver 200.
In some examples, the breech guide 30 improves the motion and/or movement characteristics of the breech assembly 150 and/or the advancement of cartridges using the example breech assembly 150 by reducing frictional forces between the bolt carrier 1, the body 6 and/or the bolt 100.
Although certain example methods, apparatus and articles of manufacture have been described herein, the scope of coverage of this patent is not limited thereto. On the contrary, this patent covers all methods, apparatus and articles of manufacture fairly falling within the scope of the appended claims either literally or under the doctrine of equivalents.
Number | Date | Country | Kind |
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10 2010 009 427.7 | Feb 2010 | DE | national |
This patent is a continuation of International Patent Application Serial No.: PCT/EP2011/000718, filed Feb. 15, 2011, which claims priority to German Patent Application 10 2010 009 427.7, filed on Feb. 26, 2010, both of which are hereby incorporated herein by reference in their entireties.
Number | Date | Country | |
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Parent | PCT/EP2011/000718 | Feb 2011 | US |
Child | 13594465 | US |