Auxiliary device for measuring hook distance of shell puller

Abstract

The purpose of the present invention is to overcome the shortcomings of the prior art and provide an auxiliary device for measuring the hook pitch of a shell puller, which can measure the actual size of the hook pitch of the shell puller. The driving screw is rotated, and the driving screw drives the sliding rod to move forward and backward. When it is adjusted to the right position, the hook teeth of the shell puller are placed on the side of a support plate of the cross-shaped flat plate of the outer sleeve. The driving screw is rotated, and the driving screw pushes the sliding rod to move forward. The sliding rod drives the straight pin to move forward together. The rear tooth surface of the hook teeth of the shell puller will contact the rear end surface of the cross-shaped flat plate of the outer sleeve for positioning. The sliding rod is twisted separately, and the sliding rod drives the straight pin to rotate, ensuring that the rear tooth surface of the hook teeth of the shell puller is completely in contact with the rear end surface of the cross-shaped flat plate of the outer sleeve; the distance L1 between the rear end surface of the cross-shaped flat plate and the front end point of the outer circumference of the straight pin is measured, and the actual size L0 of the hook pitch of the shell puller is obtained by subtracting the radius of the straight pin from L1.

Description

Technical Field

[0001] The present invention relates to the technical field of firearms, in particular to an auxiliary device for measuring the hook distance of a shell extractor. Background Art

[0002] The extractor is a critical component of a firearm. The hook pitch (the distance from the flat surface of the extractor's teeth to the center of the extractor's shaft hole) significantly impacts the reliability of extraction. Typically, the teeth of the extractor are angled. In actual production, the device used to determine the acceptable hook pitch is a bolt shape gauge. This gauge only determines the hook pitch (actually the distance from the tip of the teeth to the shaft hole) but cannot measure the actual dimensions, making comparison with the designed dimensions impossible. Furthermore, this specialized gauge, with a limited measurement capability, is only useful for mass production and cannot be used during extractor trial production and improvement verification. Existing general-purpose measuring tools like calipers cannot measure this dimension. Using CMMs and other instruments is cumbersome, costly, and requires a long inspection cycle, requiring only spot checks. This is also inconvenient in actual use. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an auxiliary device for measuring the hook distance of a shell puller, which can measure the actual size of the hook distance of the shell puller.

[0004] The object of the present invention is achieved like this:

[0005] An auxiliary device for measuring the hook distance of a shell puller, wherein the shell puller is provided with an axis hole at one end and hook teeth at the other end.

[0006] The invention comprises an outer sleeve, a driving screw and a sliding rod, wherein the rear section of the sliding rod is slidably matched with the front section of the inner hole of the outer sleeve, the front section of the sliding rod extends out of the outer sleeve, the front section of the sliding rod is provided with a V-shaped groove in the radial direction, the tip of the V-shaped groove is inserted with a straight pin, the straight pin is used to be plugged into the axial hole of the shell puller, the front end surface of the sliding rod is matched with a fastening screw along the axial thread, one end of the fastening screw extends into the V-shaped groove, the fastening screw is used to press and position the straight pin, the front end outer surface of the outer sleeve is provided with a cross-shaped flat plate, the support plate side of the cross-shaped flat plate is used to engage with the hook teeth of the shell puller;

[0007] A nut is fixed to the rear end of the inner hole of the outer sleeve, the middle thread of the driving screw is fitted in the nut, the front end of the driving screw is provided with a T-shaped step, the cross section of the T-shaped step is circular, the rear end of the sliding rod is provided with a T-shaped slot in the radial direction, the T-shaped step is slidably fitted in the T-shaped slot, so that the driving screw can drive the sliding rod to slide axially, and the sliding rod can rotate relative to the driving screw, the rear end of the driving screw is the driving end, and the driving end of the driving screw extends backward from the nut;

[0008] The driving screw is rotated, and the driving screw drives the sliding rod to move back and forth. When it is adjusted to the right position, the hook teeth of the shell puller are placed on the side of a support plate of the cross-shaped flat plate of the outer sleeve. The driving screw is rotated, and the driving screw pushes the sliding rod to move forward. The sliding rod drives the straight pin to move forward together. The rear tooth surface of the hook teeth of the shell puller will contact the rear end surface of the cross-shaped flat plate of the outer sleeve for positioning (the fit is not complete at this time). The sliding rod is twisted alone, and the sliding rod drives the straight pin to rotate to ensure that the rear tooth surface of the hook teeth of the shell puller is completely fitted with the rear end surface of the cross-shaped flat plate of the outer sleeve.

[0009] Measure the distance L1 between the rear end face of the cross-shaped plate and the front end point of the direct pin outer periphery. Subtract the direct pin radius from L1 to obtain the actual size L0 of the hook distance of the shell puller.

[0010] Preferably, the rear end surface of the drive screw is provided with a straight groove, and the straight groove is used to cooperate with a tool to screw the drive screw to adjust the axial position of the drive screw.

[0011] Preferably, the thickness of the cross-shaped flat plate is smaller than the width of the hook teeth of the shell extractor.

[0012] Preferably, the straight pin is clearance-matched with the shaft hole of the shell puller.

[0013] Preferably, the driving screw is in the shape of a stepped shaft, the driving end of the driving screw is the small-diameter end, and the driving end of the driving screw is radially provided with a ratchet pin mounting hole, and a ratchet pin is fitted in the ratchet pin mounting hole, and a ratchet is sleeved on the driving end of the driving screw, and the ratchet pin cooperates with the ratchet teeth at the front end of the ratchet to form circumferential positioning of the ratchet, and a cylindrical ratchet handle is sleeved on the ratchet, and the ratchet handle and the ratchet are circumferentially positioned, and a ratchet screw is axially arranged on the end face of the driving end of the driving screw, and a ring platform is provided in the inner hole of the ratchet handle, and the rear end face of the ring platform cooperates with the nut of the ratchet screw to form axial positioning of the ratchet handle, and the ring platform is clearance-fitted with the ratchet screw, and a spring is provided between the front end of the ring platform and the rear end of the ratchet, and the spring is sleeved on the driving end of the driving screw.

[0014] When the ratchet handle is rotated to the limit position, continue to rotate the ratchet handle, the ratchet bevel on the ratchet wheel acts on the ratchet pin, overcoming the elastic force of the spring, the ratchet bevel on the ratchet wheel disengages from the ratchet pin, and no longer drives the drive screw to rotate. Under the action of the spring, the ratchet wheel resets and hits the ratchet pin, thereby issuing an in-position prompt sound.

[0015] The outer peripheral surface of the ratchet is oblate, and the ratchet handle is matched with the ratchet through the oblate inner hole.

[0016] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0017] The actual size of the hook distance of the shell puller can be measured and then compared with the design size. It is not limited to a single type of shell puller parts, and can be used to measure a type of shell puller parts with shaft holes. It is more useful for small batch production and is convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the appearance of the present invention;

[0019] 1-Threaded drive part; 2-Outer sleeve part; 3-Parts installation part

[0020] Figure 2 A schematic cross-sectional view of the present invention;

[0021] Figure 3 An exploded schematic diagram of the present invention;

[0022] Figure 4 Schematic diagram of the drive screw;

[0023] Figure 5 Sliding rod diagram;

[0024] Figure 6 Schematic diagram of the working principle of the present invention;

[0025] Figure 7 Schematic diagram of actual measurement dimensions of hook distance.

[0026] 1- This device; 2- Shell puller;

[0027] Attached photos

[0028] In the accompanying drawings, 1-ratchet screw; 2-ratchet handle; 3-spring; 4-ratchet; 5-ratchet pin; 6-nut; 7-outer sleeve; 8-drive screw; 9-sliding rod; 10-straight pin; 11-fastening screw. DETAILED DESCRIPTION

[0029] An auxiliary device for measuring the hook distance of shell pullers. The device is not limited to a single type of shell puller parts, and can be used to measure a type of shell puller parts with shaft holes. The device is composed of a threaded driving part, an outer sleeve part and a part installation part; the threaded driving part and the part installation part are installed in the outer sleeve part, and a sliding rod is provided on the part installation part, which is connected to the driving screw of the threaded driving part through a T-slot. The driving screw and the sliding rod are installed from the cross-shaped end of the outer sleeve of the outer sleeve part. The slot at the tail of the driving screw is screwed by a slotted screwdriver, and can be matched with the nut tightly provided at the other end of the outer sleeve part. At this time, the sliding rod can be driven by the driving thread to move forward and backward, and can rotate freely around the axis; the slot at the tail of the driving screw is connected to the nut tightly provided at the other end of the outer sleeve part. A ratchet mechanism is provided at the end, and the ratchet handle is connected to the driving screw through a ratchet screw. A spring and a ratchet are installed inside it. The rotational torque during use can be limited by the ratchet pin on the driving screw, the inclined surface on the ratchet and the spring. The ratchet mechanism drives the driving screw to rotate through the ratchet pin; the outer sleeve part has a cross shape at one end and a thread that is tightly connected to the driving screw at the other end; the sliding rod of the part installation part has a V-shaped groove perpendicular to its axis, and a straight pin is installed in the groove, which is pressed on the inclined surface of the V-shaped groove by a clamping screw. The size of the straight pin can be selected according to the shaft hole of the shell hook to be measured. When in use, select a straight pin of the same size according to the shaft hole of the shell puller hook, press it into the V-groove, install the shaft hole of the shell puller hook on the straight pin, and place the hook tooth part on one side of the cross of the outer sleeve. Turn the ratchet mechanism to drive the part installation part to move axially so that the upper plane of the hook tooth fits with the cross plane. Use a general measuring tool such as a caliper or micrometer to measure the distance from the straight pin to the cross plane, and then subtract half of the straight pin diameter to get the hook distance of the shell puller hook.

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] It includes an outer sleeve 7, a driving screw 8, and a sliding rod 9. The rear section of the sliding rod 9 is slidably fitted in the front section of the inner hole of the outer sleeve 7. The front section of the sliding rod 9 extends out of the outer sleeve 7. The front section of the sliding rod 9 is provided with a V-shaped groove in the radial direction. A straight pin 10 is inserted into the tip of the V-shaped groove. The straight pin 10 is used to be plugged into the axial hole of the shell puller. The front end surface of the sliding rod 9 is axially threaded with a fastening screw 11. One end of the fastening screw 11 extends into the V-shaped groove. The fastening screw 11 is used to press and position the straight pin 10. The outer surface of the front end of the outer sleeve 7 is provided with a cross-shaped flat plate. The side of the support plate of the cross-shaped flat plate is used to engage with the hook teeth of the shell puller.

[0032] A nut 6 is fixed to the rear end of the inner hole of the outer sleeve 7, and the middle thread of the driving screw 8 is fitted in the nut 6. The front end of the driving screw 8 is provided with a T-shaped step, and the cross section of the T-shaped step is circular. The rear end of the sliding rod 9 is provided with a T-shaped slot in the radial direction. The T-shaped step is slidably fitted in the T-shaped slot, so that the driving screw 8 can drive the sliding rod 9 to slide axially, and the sliding rod 9 can rotate relative to the driving screw 8. The rear end of the driving screw 8 is the driving end, and the driving end of the driving screw 8 extends backward from the nut 6;

[0033] Rotate the driving screw 8, the driving screw 8 drives the sliding rod 9 to move back and forth. When it is adjusted to the right position, the hook teeth of the shell puller are placed on the side of one support plate of the cross-shaped flat plate of the outer sleeve 7. Rotate the driving screw 8, the driving screw 8 pushes the sliding rod 9 to move forward, and the sliding rod 9 drives the straight pin 10 to move forward together. The rear tooth surface of the hook teeth of the shell puller will contact the rear end surface of the cross-shaped flat plate of the outer sleeve 7 for positioning (the fit is not complete at this time). Twist the sliding rod 9 alone, and the sliding rod 9 drives the straight pin 10 to rotate to ensure that the rear tooth surface of the hook teeth of the shell puller is completely fitted with the rear end surface of the cross-shaped flat plate of the outer sleeve 7.

[0034] Measure the distance L1 between the rear end face of the cross-shaped plate and the front end point of the outer peripheral surface of the straight pin 10. Subtract the radius of the straight pin 10 from L1 to obtain the actual size L0 of the hook distance of the shell puller.

[0035] Preferably, the rear end surface of the drive screw is provided with a straight groove, and the straight groove is used to cooperate with a tool to screw the drive screw to adjust the axial position of the drive screw.

[0036] Preferably, the thickness of the cross-shaped flat plate is smaller than the width of the hook teeth of the shell extractor.

[0037] Preferably, the straight pin 10 is clearance-matched with the shaft hole of the shell puller.

[0038] Preferably, the driving screw 8 is in the shape of a stepped shaft, and the driving end of the driving screw 8 is the small-diameter end. The driving end of the driving screw 8 is radially provided with a ratchet pin mounting hole, and the ratchet pin mounting hole is fitted with a ratchet pin 5. The driving end of the driving screw 8 is sleeved with a ratchet 4, and the ratchet pin 5 cooperates with the ratchet teeth at the front end of the ratchet 4 to form circumferential positioning of the ratchet 4. A cylindrical ratchet handle 2 is sleeved on the ratchet 4, and the ratchet handle 2 and the ratchet 4 are circumferentially positioned. A ratchet screw 1 is axially arranged on the end face of the driving end of the driving screw 8, and a ring platform is provided in the inner hole of the ratchet handle 2. The rear end face of the ring platform cooperates with the nut of the ratchet screw 1 to form axial positioning of the ratchet handle 2, and the ring platform is clearance-fitted with the ratchet screw 1. A spring 3 is provided between the front end of the ring platform and the rear end of the ratchet 4, and the spring 3 is sleeved on the driving end of the driving screw 8.

[0039] When the ratchet handle 2 is rotated to the limit position, the ratchet handle 2 continues to be rotated, and the ratchet bevel on the ratchet 4 acts on the ratchet pin 5 to overcome the elastic force of the spring 3. The ratchet bevel on the ratchet 4 disengages from the ratchet pin 5 and no longer drives the drive screw 8 to rotate. Under the action of the spring 3, the ratchet 4 is reset and hits the ratchet pin 5, thereby issuing a prompt sound when it is in place.

[0040] The outer peripheral surface of the ratchet 4 is oblate, and the ratchet handle 2 cooperates with the ratchet 4 through an oblate inner hole.

[0041] During specific use, select a straight pin 10 of the same size according to the size of the shell hook shaft hole, loosen the fastening screw 11, install the straight pin 10 in the V-groove of the sliding rod 9, tighten the fastening screw 11, place the shell hook shaft hole on the straight pin 10, turn the ratchet handle 2 to drive the drive screw 8 to move axially, and the drive screw 8 drives the sliding rod 9 to move back and forth through the T-slot. After adjusting to the appropriate position, the hook teeth of the shell hook are placed on one side of the cross of the outer sleeve 7, and the ratchet handle 2 is turned to drive the drive screw 8 to push the sliding rod 9 to move outward. As the sliding rod 9 drives the straight pin 10 to move together, the upper plane of the hook teeth of the shell hook will be attached to the cross of the outer sleeve 7. On the plane of the letter " ", gently turn the sliding rod 9 to drive the straight pin 10 to rotate to ensure that the upper plane of the hook teeth of the shell puller will be close to the cross-shaped plane of the outer sleeve 7. When the ratchet handle 2 continues to be rotated, the inclined surface on the ratchet 4 acts on the ratchet pin 5, overcoming the elastic force of the spring 3, and disengaging from the ratchet pin 5, and no longer drives the drive screw 8 to rotate. Under the action of the spring 3, the ratchet 4 hits the ratchet pin 5 and makes a clicking sound. At this time, use a general measuring tool such as a caliper or micrometer to measure the distance L1 from the measuring surface A of the outer sleeve 7 to the measuring point B of the straight pin 10, and then subtract half of the diameter D of the straight pin 10 to obtain the actual hook distance L0 of the shell puller.

[0042] 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 limiting. 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 in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. An auxiliary device for measuring the hook distance of a shell puller, wherein one end of the shell puller is provided with an axial hole and the other end is provided with hook teeth, characterized in that: The invention comprises an outer sleeve, a driving screw and a sliding rod, wherein the rear section of the sliding rod is slidably matched with the front section of the inner hole of the outer sleeve, the front section of the sliding rod extends out of the outer sleeve, the front section of the sliding rod is provided with a V-shaped groove in the radial direction, the tip of the V-shaped groove is inserted with a straight pin, the straight pin is used to be plugged into the axial hole of the shell puller, the front end surface of the sliding rod is matched with a fastening screw along the axial thread, one end of the fastening screw extends into the V-shaped groove, the fastening screw is used to press and position the straight pin, the front end outer surface of the outer sleeve is provided with a cross-shaped flat plate, the support plate side of the cross-shaped flat plate is used to engage with the hook teeth of the shell puller; A nut is fixed to the rear end of the inner hole of the outer sleeve, the middle thread of the driving screw is fitted in the nut, the front end of the driving screw is provided with a T-shaped step, the cross section of the T-shaped step is circular, the rear end of the sliding rod is provided with a T-shaped slot in the radial direction, the T-shaped step is slidably fitted in the T-shaped slot, so that the driving screw can drive the sliding rod to slide axially, and the sliding rod can rotate relative to the driving screw, the rear end of the driving screw is the driving end, and the driving end of the driving screw extends backward from the nut; The driving screw is rotated, and the driving screw drives the sliding rod to move back and forth. When it is adjusted to the right position, the hook teeth of the shell puller are placed on the side of a support plate of the cross-shaped flat plate of the outer sleeve. The driving screw is rotated, and the driving screw pushes the sliding rod to move forward. The sliding rod drives the straight pin to move forward together. The rear tooth surface of the hook teeth of the shell puller will contact the rear end surface of the cross-shaped flat plate of the outer sleeve for positioning. The sliding rod is twisted alone, and the sliding rod drives the straight pin to rotate to ensure that the rear tooth surface of the hook teeth of the shell puller is completely in contact with the rear end surface of the cross-shaped flat plate of the outer sleeve. Measure the distance L1 between the rear end face of the cross-shaped plate and the front end point of the direct pin outer periphery. Subtract the direct pin radius from L1 to obtain the actual size L0 of the hook distance of the shell puller.

2. The auxiliary device for measuring the hook distance of a shell puller according to claim 1, characterized in that: The rear end surface of the driving screw is provided with a slotted groove, which is used to cooperate with a tool to screw the driving screw and adjust the axial position of the driving screw.

3. The auxiliary device for measuring the hook distance of a shell puller according to claim 1, characterized in that: The thickness of the cross-shaped flat plate is smaller than the width of the hook teeth of the shell puller.

4. The auxiliary device for measuring the hook distance of a shell puller according to claim 1, characterized in that: The straight pin and the shaft hole of the shell hook are clearance-matched.

5. The auxiliary device for measuring the hook distance of shell pullers according to claim 1, characterized in that: The driving screw is in the shape of a stepped shaft, and the driving end of the driving screw is the small-diameter end. The driving end of the driving screw is radially provided with a ratchet pin mounting hole, and a ratchet pin is fitted in the ratchet pin mounting hole. A ratchet is sleeved on the driving end of the driving screw, and the ratchet pin cooperates with the ratchet teeth at the front end of the ratchet to form circumferential positioning of the ratchet. A cylindrical ratchet handle is sleeved on the ratchet, and the ratchet handle and the ratchet are circumferentially positioned. A ratchet screw is axially arranged on the end face of the driving end of the driving screw, and a ring platform is provided in the inner hole of the ratchet handle. The rear end face of the ring platform cooperates with the nut of the ratchet screw to form axial positioning of the ratchet handle. A spring is provided between the front end of the ring platform and the rear end of the ratchet, and the spring is sleeved on the driving end of the driving screw.

6. The auxiliary device for measuring the hook distance of shell pullers according to claim 5, characterized in that: When the ratchet handle is rotated to the limit position, continue to rotate the ratchet handle, the ratchet bevel on the ratchet wheel acts on the ratchet pin, overcoming the elastic force of the spring, the ratchet bevel on the ratchet wheel disengages from the ratchet pin, and no longer drives the drive screw to rotate. Under the action of the spring, the ratchet wheel resets and hits the ratchet pin, thereby issuing an in-position prompt sound.

7. The auxiliary device for measuring the hook distance of shell pullers according to claim 5, characterized in that: The outer peripheral surface of the ratchet is oblate, and the ratchet handle is matched with the ratchet through the oblate inner hole.

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