A method for detecting the size of a rear-hung magazine limit

Abstract

The application discloses a detection method for a rear-hung limiting size of a magazine, which can accurately detect whether the limit size of a rear-hung limiting surface of the magazine is qualified or not. A first positioning component, a second positioning component and a plug gauge are prepared, the first positioning component has a first measuring reference surface, the second positioning component has a second measuring reference surface, and the plug gauge has a through end and a stop end; the first positioning component is placed into an inner cavity of the magazine and is positioned by a circular surface in a bullet mouth; the second positioning component is positioned by the first measuring reference surface, at this time, the second measuring reference surface is parallel to the rear-hung limiting surface of the magazine; the plug gauge is inserted between the second measuring reference surface and the rear-hung limiting surface, if the through end of the plug gauge can pass through and the stop end can stop, then the rear-hung limiting size of the magazine is qualified, otherwise, the rear-hung limiting size of the magazine is unqualified.

Description

Technical Field

[0001] This invention relates to the field of firearms technology, and in particular to a method for detecting the rear magazine mounting limit dimension. Background Technology

[0002] Whether the rear magazine mounting limit dimension (the distance between the upper plane of the magazine catch port and the rear mounting limit surface) is qualified directly affects the shape and height of the magazine after it is installed in the receiver, thus affecting the smoothness and reliability of the bolt pushing the magazine into the chamber, and consequently affecting the reliability of the gun assembly mechanism.

[0003] The method for measuring the rear magazine mounting limit dimensions generally involves using height and width vernier calipers to measure the distances between the upper plane of the magazine catch port and the design reference (the upper plane of the magazine catch port through which bullets exit), and the distance between the upper plane of the magazine catch port and the rear magazine mounting limit surface, and then calculating the result. However, this method uses the upper plane of the magazine catch port as the reference point, and the design reference, being a circular arc surface, is inaccurate. Furthermore, because there is an angle between the limit surface and the design reference, the measured dimensions differ depending on the location of the measured point. This method is cumbersome and inaccurate. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for detecting the rear magazine mounting limit dimension, which can accurately detect whether the limit dimension of the rear magazine mounting limit surface is qualified.

[0005] The objective of this invention is achieved as follows:

[0006] A method for detecting the rear magazine mounting limit dimension.

[0007] Prepare a first positioning component, a second positioning component, and a plug gauge. The first positioning component has a first measuring reference surface, the second positioning component has a second measuring reference surface, and the plug gauge has a go end and a no-go end.

[0008] Place the first positioning component into the magazine cavity, positioning it with the arc surface inside the magazine catch. Position the second positioning component through the first measuring reference surface, at which point the second measuring reference surface is parallel to the rear mounting limit surface of the magazine. Insert a plug gauge between the second measuring reference surface and the rear mounting limit surface. If the go end of the plug gauge can pass through and the stop end can stop, the rear mounting limit dimension of the magazine is qualified; otherwise, it is unqualified.

[0009] Preferably, the shape of the first positioning component corresponds to the shape of the magazine cavity. The first positioning component fits into the magazine cavity. The upper end of the first positioning component is positioned by the arc surface inside the magazine opening. The upper middle part of the first positioning component is provided with a rectangular groove along the longitudinal direction. The bottom surface of the rectangular groove forms a first measurement reference surface. The upper end of the first positioning component is provided with a rectangular positioning slot along the transverse direction.

[0010] Preferably, the mating surfaces of the first positioning component and the two sides of the magazine are arc-shaped, so that the first positioning component can be inserted into the magazine cavity from below, and the top of the first positioning component can be accurately positioned with the arc surface inside the magazine opening.

[0011] Preferably, the width of the rectangular groove of the first positioning component is smaller than the opening width of the bomb-holding port, ensuring that the top of the first positioning component can be accurately positioned with the arc surface inside the bomb-holding port.

[0012] Preferably, the lower end of the second positioning component has a positioning strip along the longitudinal direction at the middle. The positioning strip is used to position itself within the rectangular groove of the first positioning component. The bottom surface of the positioning strip is a positioning surface. A downwardly extending positioning tenon is provided on the positioning surface of the positioning strip. The positioning tenon is used to be inserted into the positioning slot of the first positioning component for positioning. Auxiliary plates are provided on both sides of the lower end of the second positioning component. The two auxiliary plates are located outside the magazine. The lower ends of the two auxiliary plates are provided with second measuring reference surfaces. The distance between the second measuring reference surfaces of the two auxiliary plates and the rear mounting limiting surfaces on both sides of the magazine corresponds to the rear mounting limiting dimensions of the magazine.

[0013] Preferably, the second measuring reference surface of the two auxiliary plates has a horizontal tilt angle, so that the second measuring reference surface is parallel to the rear hanging limiting surface.

[0014] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0015] The method and apparatus of this invention can accurately detect whether the limit dimensions of the rear mounting limit surface of a magazine are within acceptable limits. The detection method of this invention involves placing a first positioning component simulating the internal structure of the magazine into the magazine, then using a measuring reference surface. Next, a second positioning component is placed in conjunction, using another measuring reference surface that is fixed to the design reference dimension and parallel to the rear mounting limit surface. Finally, a plug gauge is used to check whether the gap is within acceptable limits. This detection method is faster and more reliable. Attached Figure Description

[0016] Figure 1 A schematic diagram of the first positioning component simulating the internal structure of a magazine.

[0017] Figure 2 Schematic diagram of the second positioning component used for measuring the rear hanging limit surface;

[0018] Figure 3 Schematic diagram of a plug gauge used to measure the rear limit dimension;

[0019] Figure 4 This is a schematic diagram of the magazine's structure. Detailed Implementation

[0020] In specific implementation, such as Figure 1 , Figure 2 , Figure 3As shown, a method for detecting the rear-mounted magazine limit dimension includes a positioning device (first positioning component) simulating the internal structure of the magazine cavity, a positioning device (second positioning component) for measuring the rear-mounted limit surface, and a plug gauge.

[0021] (1) Figure 1 A positioning device simulating the internal structure of a magazine is included. This structure is determined by the magazine's internal structure, allowing for smooth entry into the magazine. It is limited by the arc surface of the magazine's opening, accurately contacting the magazine's design reference and maintaining the relative position L1 between the magazine's design reference and the borrowed positioning measurement surface (first measurement reference surface). The dimensions and tolerances can be arbitrarily chosen as needed; in this embodiment, the tolerance is ±0.005. L2 is the transverse positioning surface of the positioning strip. L3 and L4 are used to restrict the positioning device on the rear-mounted limiting surface after measurement, ensuring that the borrowed measurement surface (second measurement reference surface) is parallel to the rear-mounted limiting surface, and that the starting point of the angle is fixed. This allows the operator to measure the same position each time, facilitating operation and increasing accuracy. The dimensions of L3 and L4 can be arbitrarily chosen, with a typical tolerance of 0.01. This positioning device should consider the symmetry of the cavity formed by the front and rear ribs of the magazine to ensure flexible entry into the magazine.

[0022] (3) Figure 2 After measurement, a positioning device (second positioning component) is used to hang the limiting surface to ensure alignment with the target surface. Figure 1 After the measuring surface (first measuring reference surface) is attached, the positioning clip is inserted. Figure 1 The L4 positioning slot, through dimensions L7, L8, L9, and α°, ensures that the starting point of the angle of the measuring surface (second measuring reference surface) borrowed by the positioning device from the rear hanging limiting surface after measurement is fixed with the design reference dimension and parallel to the rear hanging limiting surface. The positioning tenon dimensions L7 and L8 are based on... Figure 1 The dimensions of the positioning slots L3 and L4 are determined, and L9 is based on... Figure 1 The dimensions of L1 and the rear mounting limit surface are determined, ensuring that a measurement gap is left after installation; α° is determined by the dimensions on the product drawing, with a tolerance generally one-tenth of the product dimension. L7, L8, L9, and α° are all small tolerance dimensions, generally 0.005mm-0.01mm. L10 only needs to ensure that it can smoothly pass through both sides of the magazine.

[0023] (4) Figure 3 Plug gauges are used for inspection Figure 2 The distance between the measuring surface and the magazine rear mounting limit surface is measured using a positioning device. The product rear mounting limit surface dimensions -L1-L9 are the basic measurement dimensions L11 and L12. The specific manufacturing dimensions are obtained according to the algorithm of the smooth limit gauge.

[0024] First of all Figure 1 A positioning device simulating the internal structure of a magazine is inserted into the magazine, and then... Figure 2 Positioning surface and Figure 1After bonding (including both the flat surface and the slot), use Figure 4 If the plug gauge can pass through the gap between the reference surface and the rear mounting limit surface, and the go end can stop, then the size of the rear mounting limit surface is qualified; otherwise, it is unqualified.

[0025] The testing device of this invention effectively overcomes the shortcomings of the original testing method, which uses height and width vernier calipers for measurement, resulting in inaccurate positioning and cumbersome calculations. It measures the limit dimensions of the rear mounting limit surface of the magazine under test, resulting in higher testing efficiency and greater accuracy. During magazine production, the results of this device can be used to promptly identify defects in the rear mounting limit dimensions of the magazine, ensuring that the magazine meets the required dimensions. This improves the smoothness of the bolt action and, consequently, the reliability of the finished weapon.

[0026] The principle of this invention is as follows:

[0027] The positioning device (first positioning component) of the simulated magazine cavity structure in the testing device can accurately contact and reliably position itself with the design reference lines on both sides of the magazine opening after being placed into the magazine cavity to be tested. After the first positioning component of the present invention is placed into the magazine cavity, the measurement reference surface is used to form a regular measurement cavity or solid with the measurement surface, and then the plug gauge of the present invention is used to detect the magazine rear hanging limit dimension.

[0028] The detection device of the present invention effectively overcomes the shortcomings of the original detection method, which is difficult to locate the design reference plane and is inconvenient to calculate. It can simply and accurately borrow the measurement reference plane, thus improving the detection efficiency while ensuring the accuracy of the detection.

[0029] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A method for detecting the rear-mounted magazine limit dimension, characterized in that: Prepare a first positioning component, a second positioning component, and a plug gauge. The first positioning component has a first measuring reference surface, the second positioning component has a second measuring reference surface, and the plug gauge has a go end and a no-go end. Place the first positioning component into the magazine cavity, and position the first positioning component with the arc surface inside the magazine catch. Position the second positioning component through the first measuring reference surface. At this time, the second measuring reference surface is parallel to the rear mounting limit surface of the magazine. Insert a plug gauge between the second measuring reference surface and the rear mounting limit surface. If the go end of the plug gauge can pass through and the stop end can stop, the rear mounting limit dimension of the magazine is qualified; otherwise, it is unqualified. The shape of the first positioning component corresponds to the shape of the magazine cavity. The first positioning component fits into the magazine cavity. The upper end of the first positioning component is positioned by the arc surface inside the magazine opening. The middle of the upper end of the first positioning component is provided with a rectangular groove along the longitudinal direction. The bottom surface of the rectangular groove forms a first measurement reference surface. The upper end of the first positioning component is provided with a rectangular positioning slot along the transverse direction. The second positioning component has a positioning strip along its longitudinal direction at the lower center. The positioning strip is used to position itself within the rectangular groove of the first positioning component. The bottom surface of the positioning strip is the positioning surface, and a downwardly extending positioning tenon is provided on the positioning surface of the positioning strip. The positioning tenon is used to insert into the positioning slot of the first positioning component for positioning. The lower ends of the second positioning component are respectively provided with auxiliary plates. The two auxiliary plates are located outside the magazine. The lower ends of the two auxiliary plates are respectively provided with second measuring reference surfaces. The distance between the second measuring reference surfaces of the two auxiliary plates and the rear mounting limit surfaces on both sides of the magazine corresponds to the rear mounting limit dimensions of the magazine.

2. The method for detecting the rear magazine mounting limit dimension according to claim 1, characterized in that: The first positioning component and the mating surfaces on both sides of the magazine are arc-shaped, so that the first positioning component can be inserted into the magazine cavity from below, and the top of the first positioning component can be accurately positioned with the arc surface inside the magazine opening.

3. The method for detecting the rear-mounted magazine limit dimension according to claim 1, characterized in that: The width of the rectangular groove of the first positioning component is smaller than the opening width of the bomb-holding port, ensuring that the top of the first positioning component can be accurately positioned with the arc surface inside the bomb-holding port.

4. The method for detecting the rear magazine mounting limit dimension according to claim 1, characterized in that: The second measuring reference surface of the two auxiliary plates has a horizontal tilt angle, so that the second measuring reference surface is parallel to the rear hanging limit surface.

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