A positioning device and dimensional detection method for a shell puller hook

Abstract

This invention discloses a positioning device and dimensional detection method for a pull-out hook, which can accurately position the pull-out hook and is simple to detect. It includes a base, a positioning boss, a spiral positioning post, a positioning block, a fixing block, a pull-out hook spring, and a positioning rod. The base has a base connection hole and a spiral surface. The positioning boss includes a boss portion and a flat portion. The flat portion has a connection through hole, and the boss portion has a positioning block through hole. The fixing block has a threaded hole, a pull-out hook mounting hole, and side holes. One end of the spiral positioning post is fixed to the base connection hole, and the other end passes through the connection through hole and is threaded into the threaded hole for fixation. The boss portion fits into the lower part of the pull-out hook mounting hole. The positioning block slides within the positioning block through hole of the boss portion. The lower end of the positioning block contacts the spiral surface of the base. The upper end of the positioning block has a positioning shaft. The lower end of the pull-out hook spring is fitted onto the positioning shaft of the positioning block for positioning. The positioning rod passes through the side holes of the fixing block and is used to engage with the pin hole of the pull-out hook.

Description

Technical Field

[0001] This invention relates to the field of firearms technology, and in particular to a positioning device and a method for measuring the size of an extractor hook. Background Technology

[0002] The extractor is a crucial component of a rifle. Located at the bolt head, it hooks onto the rim of the cartridge case and, driven by the bolt, extracts the case from the chamber. Figure 1 As shown, the dimensions and tooth depth of the puller hook teeth to the pin hole need to be measured. Current conventional methods are very cumbersome and produce poor consistency with repeated measurements, making them unsuitable for mass production testing. Therefore, designing a dedicated measuring tool that is easy to operate, accurately positioned, and provides precise measurement has become a technical challenge in this field. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a positioning device and size detection method for a puller hook, which can accurately position the puller hook, is easy to operate, and is simple and quick to detect.

[0004] The objective of this invention is achieved as follows:

[0005] A positioning device for a shell puller hook includes a base, a positioning boss, a spiral positioning post, a positioning block, a fixing block, a shell puller hook spring, and a positioning rod.

[0006] The base has a base connection hole and a helical surface, the helical surface extending along the axis of the base connection hole. A positioning boss and a fixing block are sequentially arranged above the base, and the positioning boss and fixing block are fixedly connected. The positioning boss includes a boss portion and a flat portion. The flat portion has a connection through hole, and the boss portion has a positioning block through hole. The fixing block has a threaded hole, a pull-out hook mounting hole, and symmetrically arranged side holes. One end of the helical positioning pin is fixedly connected to the base connection hole, and the other end of the helical positioning pin passes through the positioning boss. The connecting through hole and the threaded hole on the fixing block are threaded together and fixed. The boss part of the positioning boss is fitted into the lower part of the pull-out hook mounting hole. The positioning block is slidably fitted in the positioning block through hole of the boss part. The lower end of the positioning block is in contact with the spiral surface of the base. The upper end of the positioning block is provided with a positioning shaft. The lower end of the pull-out hook spring is fitted on the positioning shaft of the positioning block for positioning. The upper end of the pull-out hook spring is used to extend into the side groove of the pull-out hook. The positioning rod passes through the two side holes of the fixing block. The middle section of the positioning rod is used to cooperate with the pin hole of the pull-out hook to position the pull-out hook.

[0007] Preferably, it further includes a measuring block, which is fixed on the upper surface of the fixing block. The measuring block is located on one side of the pull-out hook mounting hole. The measuring block is provided with an arc-shaped groove, which is used to cooperate with a plug gauge to detect the size of the pull-out hook.

[0008] Preferably, the plug gauge includes a pull-out hook tooth deep plug gauge. One side of the pull-out hook tooth deep plug gauge is a positioning arc surface, the diameter of which is equal to that of the arc groove. The positioning arc surface is used to mate with the arc groove of the measuring block for positioning. The other side of the pull-out hook tooth deep plug gauge is a detection surface. The distance that the detection surface extends beyond the pull-out hook mounting hole is the qualified dimension of the pull-out hook tooth depth. The detection surface has a go end and a stop end. The detection surface is used to mate with the end face of the pull-out hook tooth to detect the pull-out hook tooth depth.

[0009] Preferably, the plug gauge includes a plug gauge for the size of the puller hook tooth to the pin hole. The plug gauge for the size of the puller hook tooth to the pin hole has an L-shaped measuring head. The distance from the upper plane of the flat plate portion of the measuring head to the axis of the positioning rod is the qualified size of the puller hook tooth to the pin hole. The flat plate portion of the measuring head has a through end and a stop end, which are used to cooperate with the inner groove of the puller hook tooth to detect the size of the puller hook tooth to the pin hole.

[0010] Preferably, the fixing block has an embedded sleeve, and the positioning rod is slidably engaged with the sleeve.

[0011] Preferably, the lower end of the positioning block is rounded.

[0012] A method for measuring the dimensions of a positioning device for a shell puller hook.

[0013] The puller hook is inserted into the puller hook mounting hole of the fixing block from above. The side groove of the puller hook is fitted onto the puller hook spring. The positioning rod passes through the side hole of the fixing block, the sleeve, and the puller hook pin hole at the same time. At this time, the side groove of the puller hook is held in place by the puller hook spring. The other side of the puller hook, facing away from the side groove of the puller hook, contacts the fixing block. The positioning rod is inserted into the puller hook pin hole to form a positioning of the puller hook. At this time, the positioning boss and the fixing block are turned by the spiral positioning pin. During the turning process, the lower end of the positioning block contacts the spiral surface of the base and slides on the spiral surface of the base until the plane of the inner groove of the puller hook tooth is parallel to the upper plane of the fixing block.

[0014] Place the pull-out hook tooth deep plug gauge in the arc-shaped groove of the measuring block. The positioning arc-shaped surface of the pull-out hook tooth deep plug gauge should fit the arc-shaped groove of the measuring block. If the go end of the pull-out hook tooth deep plug gauge passes through and the no-go end does not, the pull-out hook tooth depth dimension is qualified. Insert the flat plate part of the measuring head of the pull-out hook tooth to pin hole dimension plug gauge into the arc-shaped groove of the measuring block. The bottom of the flat plate part of the measuring head should fit the upper plane of the fixing block. Then, extend the flat plate part of the measuring head into the inner groove of the pull-out hook tooth. If the go end of the flat plate part of the measuring head passes through and the no-go end does not, the pull-out hook tooth to pin hole dimension is qualified.

[0015] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0016] 1. The measuring device for the dimensions and tooth depth of the pull-out hook teeth of the present invention has a simple structure and low manufacturing cost;

[0017] 2. By changing the fixing block, the plug gauges of different groups can measure the dimensions of pull-out hooks of different specifications;

[0018] 3. The positioning boss and positioning block adopt a notch structure, which makes the assembly between parts flexible and adjustable;

[0019] 4. It has the advantages of convenient and quick operation, accurate measurement, accurate positioning of parts, and good repeatability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram showing the dimensions to be measured for the puller hook;

[0021] Figure 2 This is a schematic diagram of the structure of the present invention;

[0022] Figure 3 This is a cross-sectional view of the present invention;

[0023] Figure 4 This is a schematic diagram of the base;

[0024] Figure 5 This is a schematic diagram of the positioning boss;

[0025] Figure 6 This is a schematic diagram of the positioning block;

[0026] Figure 7 This is a schematic diagram of a pull-out hook tooth deep plug gauge;

[0027] Figure 8 This is a schematic diagram of the plug gauge measuring the distance from the puller hook teeth to the pin hole.

[0028] Figure 9 This is a schematic diagram of the measurement of the pull-out hook tooth deep plug gauge;

[0029] Figure 10 This is a schematic diagram of the measurement of the plug gauge from the puller hook teeth to the pin hole size.

[0030] Figure Labels

[0031] In the attached diagram, 1-base; 2-positioning boss; 3-spiral positioning post; 4-positioning block; 5-fixing block; 6-pull-out hook spring; 7-sleeve; 8-measuring block; 9-positioning rod;

[0032] 11-Base connection hole; 12-Helical surface;

[0033] 21-Boss portion; 22-Plate portion; 221-Connecting through hole; 211-Positioning block through hole;

[0034] 41 - Positioning axis;

[0035] 51 - Pull-out hook mounting hole; 52 - Side hole;

[0036] 81-Arc-shaped groove;

[0037] 101 - Side groove of the puller hook; 102 - Pin hole of the puller hook; 103 - Puller hook tooth; 104 - Inner groove of the puller hook tooth;

[0038] 105 - Positioning arc-shaped surface; 106 - Inspection surface;

[0039] 107 - Measuring head; 108 - Upper plane of the flat plate. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] like Figures 1-10 As shown, the device for detecting the dimension and tooth depth of the puller hook teeth to the pin hole includes a base 1, a positioning boss 2 above the base 1, a fixing block 5 above the positioning boss 2, and a measuring block 8 above the fixing block 5. The positioning boss 2, fixing block 5, and measuring block 8 are fixed as a whole by six M4×10 screws and two 3mm pins. A spiral positioning pin 3 is fixed in the connecting hole of the base by a 4mm pin, passes through the connecting hole of the positioning boss 2, and is screwed into the threaded hole below the fixing block 5 to adjust the position of the upper part of the whole relative to the base 1. The positioning block 4 passes through the connecting hole of the positioning boss 2 and contacts the spiral surface of the base 1. A sleeve 7 is fixed in the side hole of the fixing block 5. A puller hook spring 6 passes through the upper boss part of the positioning boss 2 and is placed in the puller hook mounting hole of the fixing block 5. The puller hook is inserted from above into the puller hook mounting hole of the fixing block 5. The puller hook spring 6 passes through the side groove. The positioning rod 9 passes through the side hole of the fixing block 5, the sleeve 7, and the puller hook pin hole, for circumferential positioning of the puller hook and radial positioning relative to the upper part. The upper part slides on the base 1 via the positioning block 4, while the spiral positioning pin 3 is adjusted for overall radial positioning. Two types of plug gauges (puller hook tooth depth plug gauge and puller hook tooth to pin hole dimension plug gauge) are respectively placed in the arc-shaped groove of the upper measuring block 8 to detect the puller hook tooth to pin hole dimension and tooth depth.

[0042] In this example, such as Figures 3-6As shown, the puller hook is inserted into the puller hook mounting hole of the fixing block 5 from above. The puller hook spring 6 is inserted into the side groove. The positioning rod 9 is inserted into the side hole of the fixing block 5, the sleeve 7 and the puller hook pin hole to fix the puller hook to the fixing block. At this time, the round head of the positioning block 4 contacts the spiral surface of the base 1. The upper part of the device is turned by the spiral positioning pin 3 (the spiral positioning pin 3 is loosely fitted with the threaded hole below the fixing block 5 to form axial positioning and can rotate). During the turning process, the round head of the positioning block 4 contacts the spiral surface of the base 1 (closely fitted under the action of the puller hook spring 6. In this embodiment, a self-locking inclined surface is formed. It can only be rotated manually and cannot slide by the axial force of the puller hook spring 6). The positioning block 4 slides on the spiral surface of the base 1 from top to bottom or from bottom to top until the lower plane of the groove inside the puller hook tooth is parallel to the upper plane of the fixing block 5 (visually or by instrument measurement).

[0043] In this example, such as Figure 3 As shown, a sleeve 7 is provided between the fixing block 5 and the positioning rod 9. The sleeve 7 is embedded in the fixing block 5, and the positioning rod 9 can move flexibly in the sleeve 7. The sleeve 7 is carburized to effectively reduce wear between it and the positioning rod 9, and can be quickly replaced after a certain amount of wear from long-term use.

[0044] In this example, such as Figure 2 As shown, the outer circumferential surface of the head of the positioning rod 9 is provided with a mesh pattern, which facilitates the positioning of the positioning rod 9 to the central positioning block 5 and the pull-out hook pin hole.

[0045] In this example, such as Figure 7 and Figure 8 As shown, the outer circumferential surface of the head of both the pull-out hook tooth depth gauge and the pull-out hook tooth to pin hole dimension gauge is provided with a textured surface for easy handheld measurement.

[0046] The measurement process of this invention:

[0047] First, insert the puller hook into the puller hook mounting hole of the fixing block. The puller hook spring, located on the small shaft above the positioning boss, then passes through the groove on the side of the puller hook. Press down the puller hook and simultaneously insert the positioning rod into the side hole of the fixing block, the sleeve, and the puller hook pin hole. Fix the entire device by adjusting the positioning block and the spiral positioning pin. Place the puller hook tooth depth gauge into the arc-shaped groove of the measuring block. The gauge's positioning arc-shaped surface should be flush against the arc-shaped groove of the measuring block. If the go end of the gauge passes through but the no-go end does not, the L2 (puller hook tooth depth) dimension is acceptable. Insert one end of the puller hook tooth to pin hole dimension gauge into the arc-shaped groove of the measuring block, with the bottom flush against the upper surface of the fixing block. Extend the gauge forward into the groove below the puller hook tooth. If the small end of the gauge passes through but the large end does not, the L1 (puller hook tooth to pin hole dimension) dimension is acceptable.

[0048] This measuring device can accurately position the machine body base, is easy to operate and simple to measure, and can obtain accurate measurement results by setting the plug gauges of different groups, with good repeatability.

[0049] 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 positioning device for a pull shell hook, characterized by: The base, positioning boss, screw positioning column, positioning block, fixed block, shell pulling hook spring, positioning rod, The base is provided with a base connecting hole and a helical surface extending along the axis of the base connecting hole. The positioning boss and the fixed block are sequentially arranged above the base and are fixedly connected. The positioning boss comprises a boss part and a flat part. The flat part is provided with a connecting through hole. The boss part is provided with a positioning block through hole. The fixed block is provided with a threaded hole, a shell pulling hook mounting hole and symmetrically arranged side holes. One end of the screw positioning column is fixedly connected to the base connecting hole. The other end of the screw positioning column is fixedly connected to the threaded hole of the fixed block through the connecting through hole of the positioning boss. The boss part of the positioning boss is matched with the lower part of the shell pulling hook mounting hole. The positioning block is slidingly matched in the positioning block through hole of the boss part. The lower end of the positioning block is in contact with the helical surface of the base. The upper end of the positioning block is provided with a positioning shaft. The lower end of the shell pulling hook spring is sleeved on the positioning shaft of the positioning block. The upper end of the shell pulling hook spring is used for extending into the side groove of the shell pulling hook. The positioning rod passes through the two side holes of the fixed block. The middle section of the positioning rod is used for cooperating with the pin hole of the shell pulling hook to position the shell pulling hook.

2. A positioning device for a pull-tab hook as defined in claim 1, wherein: The measuring block is fixed on the upper plane of the fixed block. The measuring block is located on one side of the shell pulling hook mounting hole. The measuring block is provided with an arc-shaped groove. The arc-shaped groove is used for cooperating with the plug gauge to detect the size of the shell pulling hook.

3. A positioning device for a pull-tab hook as defined in claim 2, wherein: The plug gauge comprises a shell pulling hook tooth depth plug gauge. One side of the shell pulling hook tooth depth plug gauge is a positioning arc-shaped surface. The diameter of the positioning arc-shaped surface is equal to that of the arc-shaped groove. The positioning arc-shaped surface is used for cooperating with the arc-shaped groove of the measuring block to position. The other side of the shell pulling hook tooth depth plug gauge is a detection surface. The distance between the detection surface and the shell pulling hook mounting hole is the qualified size of the shell pulling hook tooth depth. The detection surface has a through end and a stop end. The detection surface is used for cooperating with the end surface of the shell pulling hook tooth to detect the shell pulling hook tooth depth.

4. A positioning device for a pull-tab hook as defined in claim 2, wherein: The plug gauge comprises a shell pulling hook tooth to pin hole size plug gauge. The shell pulling hook tooth to pin hole size plug gauge has an L-shaped measuring head. The distance between the flat part upper plane of the measuring head and the axis of the positioning rod is the qualified size of the shell pulling hook tooth to pin hole. The flat part of the measuring head has a through end and a stop end, which are used for cooperating with the inner groove of the shell pulling hook tooth to detect the shell pulling hook tooth to pin hole size.

5. A positioning device for a pull-tab hook as defined in claim 2, wherein: The fixed block is embedded with a sleeve. The positioning rod is slidingly matched with the sleeve.

6. A positioning device for a pull-tab hook as defined in claim 2, wherein: The lower end of the positioning block is a round head.

7. A size detection method based on the positioning device of the shell pulling hook according to claim 1. The shell pulling hook is put into the shell pulling hook mounting hole of the fixing block from above, the side groove of the shell pulling hook is sleeved on the shell pulling hook spring, the positioning rod passes through the side hole of the fixing block, the sleeve and the shell pulling hook pin hole at the same time, at this time, the side groove of the shell pulling hook is resisted by the shell pulling hook spring, the other side of the shell pulling hook away from the side groove of the shell pulling hook contacts the fixing block, the positioning rod is inserted into the shell pulling hook pin hole, the shell pulling hook is positioned, at this time, the positioning convex is screwed with the fixing block through the screw positioning column, in the screwing process, the lower end of the positioning block contacts the spiral surface of the base and slides on the spiral surface of the base until the plane of the inner side groove of the shell pulling hook tooth is parallel to the upper plane of the fixing block; The shell pulling hook tooth depth plug gauge is put into the arc-shaped groove of the measuring block, the positioning arc-shaped surface of the shell pulling hook tooth depth plug gauge is positioned by abutting the arc-shaped groove of the measuring block, the through end of the shell pulling hook tooth depth plug gauge passes through, the dead end does not pass, which means that the shell pulling hook tooth depth size is qualified, the flat plate part of the shell pulling hook tooth to pin hole size plug gauge measuring head is put into the measuring block arc-shaped groove, the bottom of the flat plate part of the measuring head abuts the upper plane of the fixing block, the flat plate part of the measuring head is further inserted into the inner side groove of the shell pulling hook tooth, the through end of the flat plate part of the measuring head passes through, the dead end does not pass, which means that the shell pulling hook tooth to pin hole size is qualified.

Images