Tool for detecting protrusion amount of firing pin

Abstract

A positioning sleeve is a rotary body with a step hole in the center of the bottom surface, one end surface of the positioning sleeve is provided with a zero reference surface O, a step surface C, a step surface B and a step surface A. The step surface A corresponds to the maximum position of the protrusion of the firing pin, and the step surface B corresponds to the minimum position of the protrusion of the firing pin. The step surface C corresponds to the position with the minimum protruding amount of the compressed firing pin; an insertion through groove of the clamping plate and a pin hole I vertically penetrating through the insertion through groove are formed in one end part of the measuring rod; the clamping plate is provided with a measuring surface and a pin hole II; the measuring rod is slidably mounted in the stepped hole of the positioning sleeve; the clamping plate is inserted into the insertion through groove of the measuring rod and is fixed on the measuring rod through a pin; the other end face, far away from the pin hole I, of the measuring rod is flush with the corresponding end face of the positioning sleeve and is in a zero position when flush, and at the moment, the measuring face of the clamping plate abuts against the zero reference face O of the positioning sleeve. The device is simple in structure, convenient to use, high in qualitative analysis precision and wide in application range.

Description

Technical Field

[0001] The utility model belongs to the technical field of firearm maintenance equipment, and relates to a firing pin protrusion amount detection tool. Background Art

[0002] The firing pin is a key component of a firearm. In order to ensure that the firing pin can ignite the primer 100% when firing, a certain firing pin protrusion amount needs to be designed. The firing pin protrusion amount is the dimension of the tip of the firing pin protruding outside the plane of the cartridge base groove of the bolt. After long-term use of the firearm, the firing pin will have varying degrees of wear, deformation or breakage, resulting in the firing pin protrusion amount not meeting the requirements. An improper firing pin protrusion amount will directly affect the reliability and safety of the firearm. Therefore, during technical inspection and later maintenance of the firearm, it is necessary to strictly detect the protrusion amount of the firing pin. The existing firing pin protrusion amount detection tools have complex structures, are inconvenient to use, and have a small applicable range. Summary of the Utility Model

[0003] The purpose of the utility model is to solve the above problems existing in the prior art, and provide a firing pin protrusion amount detection tool with a simple structure, convenient use, and high qualitative analysis accuracy. This detection tool can measure the firing pin protrusion amounts of firearms of different specifications with one device, and has a wide applicable range.

[0004] To achieve the above purpose, the technical solution of the utility model is: a firing pin protrusion amount detection tool, including a positioning sleeve with an outer circle matching the inner wall of the cartridge base groove of the bolt, a measuring rod, a pin, and a clamping plate; the positioning sleeve is a rotating body with a stepped hole at the center of the bottom surface, and one end surface thereof is provided with a zero reference surface O, a stepped surface C, a stepped surface B, and a stepped surface A with high dimensional accuracy. The stepped surface A corresponds to the position where the firing pin protrusion amount is the largest, the stepped surface B corresponds to the position where the firing pin protrusion amount is the smallest, and the stepped surface C corresponds to the position where the firing pin protrusion amount is the smallest after compression; one end of the measuring rod is provided with an insertion through groove for the clamping plate and a pin hole I vertically penetrating the insertion through groove; the clamping plate is provided with a measuring surface and a pin hole II communicating with the pin hole I; the measuring rod is slidably installed in the stepped hole of the positioning sleeve; the clamping plate is inserted into the insertion through groove of the measuring rod and fixed on the measuring rod by a pin fixed in the pin hole I and the pin hole II; the other end surface of the measuring rod away from the pin hole I is flush with the corresponding end surface of the positioning sleeve. When they are flush, it is the zero position, and at this time, the measuring surface of the clamping plate abuts against the zero reference surface O of the positioning sleeve.

[0005] Further preferably, a relief groove is also opened at one end of the clamping plate with the measuring surface. This can avoid interference during installation.

[0006] Further preferably, there is a radial threaded hole in the middle position of the positioning sleeve, and a ring groove is opened at the corresponding position of the measuring rod. The length of the ring groove is not less than the thickness of the step surface A of the positioning sleeve. The set screw threadedly connected in the radial threaded hole of the positioning sleeve abuts against the ring groove of the measuring rod, and the abutting force does not affect the rotation of the measuring rod and its sliding along the positioning sleeve under the push of the firing pin. The set screw is only used to prevent the measuring rod from slipping out of the positioning sleeve.

[0007] During use, insert the positioning sleeve into the cartridge base groove of the bolt. After the firing pin abuts against the measuring rod, continue to move the positioning sleeve. The firing pin pushes the measuring rod to move in the opposite direction until it stops moving when the positioning sleeve abuts against the bottom surface of the cartridge base groove of the bolt. At this time, the firing pin pushes the measuring rod into place. Rotate the clamping plate. As long as the measuring surface of the clamping plate is between the step surface B and the step surface A, it proves that the protrusion amount of the firing pin in the normal state is within the qualified range. Press the measuring rod. After the firing pin is compressed in place, rotate the clamping plate. If the measuring surface of the clamping plate is not between the zero reference surface O and the step surface C, it is qualified.

[0008] Compared with the prior art, the beneficial effects of the present utility model are as follows: During measurement, the positioning sleeve of the present utility model moves in the cartridge base groove of the bolt, and at the same time, the firing pin pushes the measuring rod and the clamping plate to move in the opposite direction. When the positioning sleeve abuts against the bottom surface of the cartridge base groove of the bolt, the measuring rod and the clamping plate also stop moving. At this time, as long as it is judged which two step surfaces of the positioning sleeve the measuring surface of the clamping plate is located between, it can be judged whether the protrusion amount of the firing pin is within the qualified range. After pressing the measuring rod and observing the compression of the firing pin, the position where the measuring surface of the clamping plate is located can be used to judge whether the compression range of the firing pin is qualified. The present utility model has a simple structure, is convenient to use, has high qualitative analysis accuracy, and one tool can measure the protrusion amount of the firing pins of different specifications of firearms, with a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0010] Figure 2 is a front view cross-sectional view of the present utility model;

[0011] Figure 3 is a three-dimensional structural schematic diagram of the positioning sleeve in the present utility model;

[0012] Figure 4 is a three-dimensional structural schematic diagram of the measuring rod in the present utility model;

[0013] Figure 5 is a three-dimensional structural schematic diagram of the clamping plate in the present utility model;

[0014] Figure 6 is a structural schematic diagram of the present utility model during measurement. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments.

[0016] As Figures 1 to 6 shown, this embodiment includes a positioning sleeve 1 with an outer circle matching the inner wall of the breechblock cartridge base groove, a measuring rod 2, a pin 3, and a clamping plate 4. The positioning sleeve 1 is a rotating body with a stepped hole 12 at the center of the bottom surface. One end surface thereof is provided with a zero reference surface O, a stepped surface C, a stepped surface B, and a stepped surface A with high dimensional accuracy. The stepped surface A corresponds to the position where the striker protrusion amount is the largest, the stepped surface B corresponds to the position where the striker protrusion amount is the smallest, and the stepped surface C corresponds to the position where the striker protrusion amount is the smallest after compression. One end of the measuring rod 2 is provided with an insertion through groove 7 for the clamping plate 4 and a pin hole Ⅰ8 vertically penetrating the insertion through groove 7. The clamping plate 4 is provided with a measuring surface 13 and a pin hole Ⅱ9 communicating with the pin hole Ⅰ. The measuring rod 2 is slidably installed in the stepped hole 12 of the positioning sleeve 1. The clamping plate 4 is inserted into the insertion through groove 7 of the measuring rod 2 and fixed to the measuring rod 2 by a pin 3 fixed in the pin hole Ⅰ8 and the pin hole Ⅱ9. The other end surface of the measuring rod 2 away from the pin hole Ⅰ is flush with this end surface of the positioning sleeve 1. When flush, it is at the zero position. At the same time, the measuring surface 13 of the clamping plate 4 abuts against the zero reference surface O of the positioning sleeve 1.

[0017] Preferably, a relief groove 10 is also opened at one end of the clamping plate 4 with a measuring surface in this embodiment to avoid interference during installation.

[0018] Preferably, in order to prevent the measuring rod 2 from slipping out of the positioning sleeve 1, there is a radial threaded hole 11 at the middle position of the positioning sleeve 1, and a ring groove 6 is opened at the corresponding position of the measuring rod 2. The length of the ring groove 6 is not less than the thickness of the stepped surface A of the positioning sleeve 1; a set screw 5 threadedly connected in the radial threaded hole 11 of the positioning sleeve 1 abuts against the ring groove 6 of the measuring rod 2, and the abutting force does not affect the rotation of the measuring rod 2 and its sliding along the positioning sleeve 1 under the push of the striker.

[0019] During use, insert the positioning sleeve 1 into the breechblock cartridge base groove 14. After the striker 15 abuts against the measuring rod 2, continue to move the positioning sleeve 1. The striker 15 pushes the measuring rod 2 to move in the opposite direction until the positioning sleeve 1 abuts against the bottom surface of the breechblock cartridge base groove 14 and stops moving. At this time, the striker 15 pushes the measuring rod 2 to the in-place position. Rotate the clamping plate 4. As long as the measuring surface 13 of the clamping plate is between the stepped surface B and the stepped surface A, it proves that the striker protrusion amount of the striker 15 in the normal state is within the qualified range. Press the measuring rod 2 to compress the striker 15 in place, and then rotate the clamping plate 4. If the measuring surface 13 of the clamping plate is not between the zero reference surface O and the stepped surface C, it is qualified.

[0020] Of course, there are also many other embodiments of the present utility model. Without departing from the spirit and essence of the present utility model, those skilled in the art can make corresponding changes and deformations according to the present utility model. However, these corresponding changes and deformations should all belong to the improvement of equivalent technologies and fall within the protection scope of the claims of the present utility model.

Claims

1. A firing pin protrusion detection tool, characterized in that: It includes a positioning sleeve with an outer circle matching the inner wall of the cartridge chamber of the bolt, a measuring rod, a pin and a clamping plate; the positioning sleeve is a rotating body with a stepped hole at the center of the bottom surface, and a zero reference surface O, a stepped surface C, a stepped surface B and a stepped surface A with high-precision dimensions are provided on one end surface thereof. The stepped surface A corresponds to the position where the striker protrusion amount is the largest, the stepped surface B corresponds to the position where the striker protrusion amount is the smallest, and the stepped surface C corresponds to the position where the striker protrusion amount is the smallest after compression; one end of the measuring rod is provided with an insertion through groove for the clamping plate and a pin hole I vertically penetrating the insertion through groove; the clamping plate is provided with a measuring surface and a pin hole II communicating with the pin hole I; the measuring rod is slidably installed in the stepped hole of the positioning sleeve; the clamping plate is inserted into the insertion through groove of the measuring rod and fixed on the measuring rod by a pin fixed in the pin hole I and the pin hole II; the other end surface of the measuring rod away from the pin hole I is flush with the corresponding end surface of the positioning sleeve. When they are flush, it is the zero position, and at this time, the measuring surface of the clamping plate abuts against the zero reference surface O of the positioning sleeve.

2. The firing pin protrusion amount detection tool according to claim 1, wherein: There is a radial threaded hole at the middle position of the positioning sleeve, and a ring groove is opened at the corresponding position of the measuring rod. The length of the ring groove is not less than the thickness of the stepped surface A of the positioning sleeve; a set screw screwed into the radial threaded hole of the positioning sleeve abuts against the ring groove of the measuring rod, and the abutting force does not affect the rotation of the measuring rod and its sliding along the positioning sleeve under the push of the striker.

3. The firing pin protrusion amount detection tool according to claim 1 or 2, characterized in that: A relief groove is also opened at one end of the clamping plate where the measuring surface is located.

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