Description:PORTABLE FIREARM RECEIVER HAVING PICATINNY RAIL LOCKING ASSEMBLIES WITH DUAL PINS FOR RECEIVER
FIELD OF INVENTION
[0001]
The present invention relates to a portable firearm, such as, for example, pistols and shoulder-fired firearms (e.g., rifles, carbines, shotguns, submachine guns, and machine carbines) having a receiver.
BACKGROUND
[0002]
A receiver for a firearm is usually a removeable receiver that does not require the entire removal of the receiver in order to gain access to components (e.g., the bolt mechanism of the firearm) for disassembly and / or cleaning. However, the receiver cover when removed from its housing, exposes an annular region to facilitate access to components, such as bolt mechanism of the firearm.
[0003]
In standard firearms, actuation of the trigger releases a sear, allowing a hammer or striker to fire a chambered ammunition cartridge. Part of the ammunition's propellant force is used to cycle the action, extracting and ejecting a spent cartridge and replacing it with a loaded cartridge. The cycle includes longitudinal reciprocation of a bolt and/or carrier, which also resets the hammer or striker.
[0004]
A standard trigger mechanism includes a disconnector, which holds the hammer or striker in a cocked position until the trigger member is reset to engage the sear. This allows the firearm to be fired only a single time when the trigger is pulled and held, because the user is not typically able to release the trigger rapidly enough so that the sear engages before the bolt or bolt carrier returns to its in-battery position.
[0005]
A common trigger in firearms is one requiring low energy for trigger reset. This finger manipulated trigger operating concept is commonly referred to as “trigger reset” and is a conventional in firearms. In these type of triggers, a trigger is pulled to fire known as trigger depression. Trigger depression energy may be very low, indicating a light trigger pull, while having a relatively faster and/or stronger trigger reset event than otherwise possible. A characteristic of this system is that if one pulls a trigger force fully enough it will not reset
/ 2 /
automatically because bolt energy is transmitted through a disconnector and then
through the trigger that is separated by a spring of higher torsion resistance than the usual trigger reset spring. If force on the trigger exceeds the resistance of this spring then the trigger will not reset but the disconnector will function regardless. What this does is that the bullet in the chamber subsequent to a preceding fire / trigger pull, may misfire / jammed in the chamber itself.
[0006]
For various reasons, shooters desire to increase the rate of fire from a firearm. In the past, users have been known to employ ‘rapid firing’ to achieve rapid semiautomatic fire. Rapid / Bump firing uses the recoil of the firearm to fire shots in rapid succession. This rapid firing, too causes the bullet in the chamber after a preceding fire / trigger pull, may misfire / jammed in the chamber or magazine itself. This gives rise to the problem of rapid wearing out of the bolt mechanism due to the extensive wear of the parts in the chamber. As the bolt engages, it impacts the receiver and its assembly, they undergo substantial and rapid wear, requiring frequent maintenance.
[0007]
Another concern is that while loading the charging handle, the bolt cannot guide (move to position) smoothly and accordingly the charging handle loading and unloading is not smooth. At times, the bolt gets jammed in the charging handle rod.
[0008]
Yet another concern is that a standard magazine, for example, a ten-shot magazine does not fit into the receiver properly, because of the receiver construction. This construction caused the entire receiver body to reverberate with the magazine shaking upon firing of bullets. At times, the problem (shaking) became so severe that the (next) bullet did not pass to the barrel in a proper angle. At times, bullets get stuck into the magazine because of the improper angle.
[0009]
This same issue, ‘improper fitting/coupling’ also causes recoil forces to be distributed over a relatively small space and time. This, coupled with fast and sub optimally violent bolt “unlocking” from the barrel extension makes the firearm operate in a much faster and more violent manner than optimal.
[0010]
Accordingly, what is needed is a design that addresses these structural issues in receiver, provides for lesser chance of misfire and stabilized performance.
/ 3 /
SUMMARY
[0011]
It is the object of the present invention to provide a firearm that is designed for preventing misfire and provides a stabilized functioning of the firearm that prevents violent recoil.
[0012]
The foregoing and other objectives, features, and advantages of the invention will be more readily understood upon consideration of the following detailed description of the invention, taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF DRAWINGS
[0013]
A more detailed understanding may be had from the following description, given by way of example in conjunction, including identifying the problem, its cause etc. with the accompanying drawings wherein:
[0014]
FIG. 1A and FIG. 1B are isometric views / exploded part view of a firearm;
[0015]
FIG. 2 is a labelled view of parts of a firearm of FIG. 1A;
[0016]
FIG. 2 is perspective view of the receiver bolt group in covered position and depicts its conventional construction;
[0017]
FIG. 3A and FIG. 3B are views of the receiver bolt group of FIG. 2;
[0018]
FIG.4A-4D are cross-sectional views of the bolt group / cut sectional views and shows parts of the bolt group element of a receiver of a firearm of FIG. 2;
[0019]
FIG. 4E reflects a condition of misfire due to not hitting the rim;
[0020]
FIG. 4F reflects the complete bot action, and shows rim fire bullet, i.e. a condition of misfire due to not hitting the rim; and
[0021]
FIG. 5A-5E shows cross-sectional construction of receiver bolt group with a secondary pin placement preventing misfire;
DETAILED DESCRIPTION
[0022]
Embodiments are described herein that describe a system for construction for the various elements of the receiver for a firearm.
[0023]
FIG. 1A shows a conventional firearm, which serves as an example to which aspects of the invention disclosed herein are to be applied. FIG. 1B shows, among other elements, parts of the firearm of FIG. 1A. These include a buttstock
/ 4 /
1
0, a barrel, picatinny rail receiver mounting, pins, etc. as 20 a scope, mount etc. as 30, a magazine well, a trigger, a barrel, a bolt carrier, a bolt, a firing pin, a charging handle, an upper receiver, as 40, a bolt catch, trigger, changing handle, rod, firing pin, a magazine catch, and a magazine release button, etc. as group 50, 60.
[0006] During operation of a direct impingent type firearm, such as the one as shown in FIG. 1A, gas travels down a gas tube located above the barrel. The gas tube is operatively connected to a bolt carrier key allowing the gas from the gas tube to pass into the bolt carrier. The bolt and bolt carrier together act as a piston (bolt) and cylinder (bolt cavity or recess within carrier body), which moves as the bolt carrier cavity is filled with gas which pushes the bolt and carrier body apart via expansion of gasses. The bolt is incapable of rearward movement when it is locked to barrel extension. It unlocks from the extension via rotation of the bolt controlled by the cam path or slot and the movement of a cam pin within the cam path which controls rotational movement or turning of the bolt. This impacts both the movement out of battery (“unlocking”) and movement into battery (“locking”). Therefore, when the bolt carrier is filled with gas, the bolt carrier is forced backward by interaction of the expanding gasses creating movement between the bolt and bolt recess within the carrier body—which are kept together by the cam pin moving within the cam path, toward the buttstock.
[0024]
FIG. 2 is perspective view of the firearm of FIG. 1A and describes front sight assembly 202, rear sight assembly 204 , receiver assembly 206, rifle recoil butt 208, sling swivel stud 218, wooden stock 216, trigger assembly 214, charging handle / rod 212, barrel 210.
[0025]
FIG. 3A is a zoomed in view of the receiver assembly 204 with receiver cover removed and shows the bolt assembly 40. FIG. 3B shows the construction of the bolt assembly 40 with bolt assembly shown (element 410) out of the receiver sub-assembly 204.
[0026]
FIG. 4A–4F describe the various ways in which a bullet is caused to be misfired. FIG.4A-4D are cross-sectional views of the bolt group / cut sectional views and shows parts of the bolt group element of a receiver of a firearm of FIG. 2; FIG. 4E reflects a condition of misfire due to not hitting the rim; FIG. 4F
/ 5 /
reflects the complete bo
lt and shows a rim fire bullet, i.e. a condition of misfire due to not hitting the rim. These figures show that the correct identification of a problem / cause is part of the embodiments of the invention described herein.
[0027]
In FIG. 4A, charging handle is 420, charging handle rod is 422 and coiled spring (helical) is 424, and bolt assembly is 426.
[0028]
FIG. 4B is isometric of parts of FIG. 4A showing parts of the bolt assembly. In FIG. 4B, a firing / rebounding pin is shown by 430, firing / rebounding pin spring by 432, firing pin by 434 and bolt group construction by 438.
[0029]
FIG. 4C shows complete bolt assembly and depicts an extractor / extractor pin are shown together as 440, space for charging handle / rod by 442, bolt is 444, firing pin is 446 and firing / rebounding pin space by element 448.
[0030]
FIG. 4D is a cut sectional view of FIG. 4C /FIG. 4B and shows bolt 450 / 444, firing pin 452/434, firing / rebounding pin 454/430, firing / rebounding pin spring 456 / 432 are shown.
[0031]
FIG. 4E is a cut sectional view of FIG. 4C / 4B: depicting a reason for misfire: When the hammer, upon triggering hits the firing pin, the firing pin moves up front side and a bullet in the chamber becomes a rimfire bullet: this bullet fires only when the exact rim of bullet is hit. Because of the misalignment of the firing pin / rebounding pin does not hit the rim of bullet and misfire occurs.
[0032]
FIG. 4F shows the various parts of FIG. 4E: wherein barrel 402, rimfire bullet 300, bolt 468, firing pin 466, firing / rebounding pin 464, and firing / rebounding pin spring 462. The bolt group with its components as described is reflected as 438 / 538.
[0033]
FIG. 5A-5E shows cross-sectional construction of receiver bolt group with a secondary pin placement preventing misfire.
[0034]
FIG. 5A depicts construction of space for an additional guiding pin 502 at the edge of the receiver and connecting barrel.
[0035]
FIG. 5B depicts the guiding pin 510 and additional space there for 520 / 502 at the edge of the receiver and connecting barrel.
[0036]
FIG. 5C depicts the construction of the bolt with the guiding pin 510 and additional space there for 520.
/ 6 /
[0037]
FIG. 5D depicts construction of bolt group and is cross sectional view showing the limited space 540 for movement of a bullet.
[0038]
FIG. 5E is a cut sectional view showing the movement of the path of the bullet to prevent misfire: wherein barrel 580, rim fire bullet 300, front guiding pin 540 / 510, bolt 522, firing / rebounding pin 524 and firing / rebounding pin 528.
[0039]
In accordance with the embodiments of the present invention, the entire bolt group is stabilized using an additional guiding pin at the end of the receiver chamber on the face of the barrel / chamber. Usage of an additional pin at the chamber / barrel face to prevents upward movement of a recoil biasing member. With this additional change, the bolt group applies downward force on the barrel such that the chamber face is aligned with the receiver. This construction also prevents breakage of bolt lugs. The bolt stays locked longer prior to unlocking, which makes extraction of the spent casing easier and less violent since the gas pressure within the case drops by use of the guiding pin.
[0040]
Physical Constraint: The guiding pin, being positioned at the edge of the receiver housing and the connecting barrel, acts as a physical barrier or stop. As the bolt assembly moves upward during the firearm's operation, the pin would come into contact with a corresponding surface or feature on the bolt assembly, preventing it from exceeding a certain height or position. The guiding pin or the surface it interacts with on the bolt assembly has an angled or camming surface. As the bolt assembly moves upward, this angled surface forces the bolt assembly to translate or rotate slightly, redirecting its motion and limiting its upward travel. Depending on the specific design and placement of the guiding pin, it could potentially act as a lever. When the bolt assembly reaches its upward limit and contacts the pin, the pin could exert a force or leverage that counteracts the upward momentum of the bolt assembly, effectively halting its upward movement.
[0041]
By restricting excessive upward movement of the bolt assembly, the guiding pin helps maintain proper alignment between the chamber face and the receiver. This ensures that the bullet / cartridge is correctly positioned for firing, reducing the risk of misfires or malfunctions. Limiting the upward travel of the bolt assembly also minimizes the impact and stress on the receiver and other
/ 7 /
components during the firing cycle. This reduce
s wear and tear, prolonging the firearm's lifespan and improving its reliability.
[0042]
The embodiments as described reduce the exposure to operators of acrid exhaust gas due to less pressurized gas exiting the chamber and bore into the action. As can be seen, the construction of the bolt group in accordance with the embodiments described herein ensures that there is less(er) recoil and comparatively reduced chances of the bullet being stuck or misfiring.
[0043]
The terms "coupled," "attached," or "connected" may be used herein to refer to any type of relationship, direct or indirect, between the components at issue, and may apply to electrical, mechanical, fluid, optical, electromagnetic, electromechanical or other connecting means. In addition, the terms ‘first’, ‘second’, etc. are used herein only to facilitate discussion, and carry no particular chronological significance unless otherwise indicated.
[0044]
While many embodiments of the present invention relating to the receiver for firearm have been illustrated, it will be appreciated by those skilled in the art that modifications of the invention may occur however, the invention should be construed to include everything within the scope of the disclosure without departing from the invention in its broader aspects. Based on the foregoing description, those skilled in the art will appreciate that the broad techniques of the embodiments can be implemented in a variety of forms. Therefore, while the embodiments have been described in connection with particular Illustrations thereof, the true scope of the embodiments should not be so limited since other modifications will become apparent to the skilled practitioner upon a study of the drawings, specification, and following claims.
* * * , Claims:CLAIMS
We Claim:
1.
A receiver bolt group 538 for a firearm, the receiver bolt group 538 comprising:
a receiver housing 40 defining an internal region to receive a bolt assembly 426 including a firing pin 434, a firing pin’s rebounding pin 430, a firing / rebounding pin spring 432;
a guiding pin 510 positioned at the edge of the receiver and connecting barrel 580 of the firearm;
an additional space 520 for receiving the guiding pin at the edge of the receiver and connecting barrel, such that space for movement of a bullet is restricted by the presence of the guiding pin that prevents upward movement of the bolt by application of downward force on the receiver edge adjoining the barrel to align the chamber face with the receiver.
2.
The receiver bolt group 538 of claim 1, wherein the guiding pin 510 prevents breakage of bolt lugs.
3.
The receiver bolt group 538 of claim 1, wherein the guiding pin 510 locks the receiver bolt group in a position such that end-to-end movement is restricted to a range of 0.01? –0.50? .
4.
The receiver bolt group 538 of claim 1, wherein the guiding pin 510 locks the receiver bolt group in a position such that end-to-end movement is restricted to a range of 0.51? –2.76?.
5.
The receiver bolt group 538 of claim 1, wherein the guiding pin 510 is positioned at the end of the receiver chamber on the face of the barrel/chamber.
6.
A method of minimizing misfire in a firearm upon firing, the method comprising:
/ 2 /
providing a firearm receiver bolt group 538 having a receiver housing 40 having an internal region to receive a bolt assembly 426 / 438, a firing pin 434, a firing pin’s rebounding pin 430, a firing / rebounding pin spring 432;
positioning a guiding pin 510 at an edge of the receiver housing 40 and a connecting barrel 580, wherein the guiding pin limits upward movement of the bolt assembly and aligns the chamber face with the receiver.
7.
The method of claim 6, wherein positioning the guiding pin reduces wear and tear on the bolt assembly and the receiver housing.
8.
The method of claim 6, wherein positioning the guiding pin improves the stability of the firearm.
9.
The method of claim 6, wherein the guiding pin 510 locks the receiver bolt group in a position such that end-to-end movement is restricted to a range of 0.01? –0.50? .
10.
The method of claim 6, wherein the guiding pin 510 locks the receiver bolt group in a position such that end-to-end movement is restricted to a range of 0.51? –2.76?.
* *