Lens adapter ring

Abstract

The utility model relates to a lens adapter ring. The lens adapter ring comprises a lens clamping assembly, a driving assembly, a machine body clamping piece and a restraining piece. A bayonet capable of being matched with a lens is formed in the lens clamping assembly, a bayonet capable of being matched with a camera body is formed in the camera body clamping piece, the driving assembly is in threaded connection with the lens clamping assembly and the camera body clamping piece, and the restraining piece is used for preventing the lens clamping assembly and the camera body clamping piece from rotating along with rotation of the driving assembly; the lens adapter ring is provided with a light channel for light to reach the area surrounded by the bayonet of the camera body clamping piece from the area surrounded by the bayonet of the lens clamping assembly. And in the rotating process of the driving assembly, the bayonet of the lens clamping assembly and the bayonet of the machine body clamping piece are close to each other or far away from each other. The lens can be installed on the machine body through the lens adapter ring. The lens adapter ring adopts two thread groups to realize macro adjustment, and compared with an adapter ring which adopts a single thread group to realize macro adjustment, the lens adapter ring has a larger macro stroke.

Description

Technical Field

[0001] The utility model relates to the technical field of photographic equipment accessories, in particular to a lens adapter ring used for connecting a camera body and a lens. Background Art

[0002] Currently, due to the fact that the bayonet designs of some digital camera brands are not completely consistent, the lenses of these brands are not compatible. For example, Leica M series lenses use the Leica M mount, while Fujifilm GFX series cameras use the G mount. These differences in bayonet design prevent the two from being directly connected. In other words, Leica M series lenses cannot be directly installed on Fujifilm GFX series camera bodies.

[0003] The common solution to the problem of camera bodies and lenses being unable to connect directly due to differences in bayonet mount design is to add a lens adapter between the two. This lens adapter has a bayonet mount for the camera body and a bayonet mount for the lens. However, currently, these lens adapters cannot adjust macro focus. Utility Model Content

[0004] In view of the above problems, the present invention is proposed to provide a lens adapter ring that overcomes the above problems or at least partially solves the above problems.

[0005] The lens adapter ring includes a lens clamping assembly, a driving assembly, a body clamping part, and a restraining part; the lens clamping assembly is formed with a bayonet capable of cooperating with the lens, and is formed with a first thread rotating in a first rotation direction; the driving assembly is formed with a second thread rotating in the first rotation direction, and the second thread cooperates with the first thread; the driving assembly is also formed with a third thread rotating in the second rotation direction; the body clamping part is formed with a bayonet capable of cooperating with the body, and is formed with a fourth thread rotating in the second rotation direction; the fourth thread cooperates with the third thread; the restraining part is used to prevent the lens clamping assembly and the body clamping part from rotating with the rotation of the driving assembly; the lens adapter ring is formed with a light channel for light to reach the area surrounded by the bayonet of the body clamping part from the area surrounded by the bayonet of the lens clamping assembly; during the rotation of the driving assembly, the bayonet of the lens clamping assembly and the bayonet of the body clamping part approach or move away from each other.

[0006] In one embodiment, a projection of the second thread on a plane passing through the thread axis thereof overlaps with a projection of the third thread on a plane passing through the thread axis thereof.

[0007] In one embodiment, the lens mounting assembly includes a lens mounting ring, a spring, and a driven ring; the lens mounting ring is fixedly connected to the driven ring, and the two jointly constrain the spring arranged between the lens mounting ring and the driven ring; the first thread is formed on the outer peripheral wall of the driven ring.

[0008] In one embodiment, the restraint is fixedly connected to the body clamping member; the lens clamping ring and / or the driven ring form a guide groove or a guide hole, and the restraint includes a linear guide portion extending into the guide groove or the guide hole of the lens clamping ring, and / or, extending into the guide groove or the guide hole of the driven ring, and the extension direction of the linear guide portion is parallel to the extension direction of the light channel.

[0009] In one embodiment, the drive assembly includes a drive ring, the second thread is formed on the inner circumferential wall of the drive ring, and the third thread is formed on the outer circumferential wall of the drive ring; the fuselage clip is generally annular, and the fourth thread is formed on the inner circumferential wall of the fuselage clip.

[0010] In one embodiment, the driving assembly further includes a stroke limiter, which is fixedly connected to the driving ring and is used to limit the rotation angle of the driving ring.

[0011] In one embodiment, the stroke limiter is generally annular, and two stop portions are formed on its outer peripheral wall. The body clamping part is provided with a stop block. When the drive ring is at the starting angle position or the terminal angle position of its rotation angle, the stop block abuts against the corresponding stop portion to prevent the drive ring from rotating beyond the restricted angle range.

[0012] In one embodiment, the driving assembly further includes a control ring, which is directly or indirectly fixedly connected to the driving ring, and covers the other end of the fuselage clip away from the end where the clip of the fuselage clip is located.

[0013] In one embodiment, the lens adapter ring further includes a locking assembly, which is mounted on the control ring. The body clip is formed with a locking opening, and a locking tongue of the locking assembly can extend into or out of the locking opening to lock the relative positions of the body clip and the control ring, or to unlock the relative positions of the body clip and the control ring.

[0014] In one embodiment, the fuselage clamp includes a first ring portion, the fourth thread is formed on the inner circumferential wall of the first ring portion, the bayonet of the fuselage clamp is formed at one end of the first ring portion, and the edge of the other end of the first ring portion extends radially outward to form a first ring platform portion, and the fuselage clamp also includes a first annular guide portion fixed on the first ring platform portion, which is used to guide the control ring to cover the other end of the fuselage clamp away from the end where the bayonet of the fuselage clamp is located.

[0015] In one embodiment, the drive ring includes a second ring portion, the second thread is formed on the inner circumferential wall of the second ring portion, and the third thread is formed on the outer circumferential wall of the second ring portion; the drive ring also includes a second ring stage portion extending radially outward along one end edge of the second ring portion, and the second ring stage portion can be pressed against the first ring stage portion; the drive ring also includes a second annular guide portion fixed on the second ring stage portion for guiding the travel limiter to be installed on the drive ring.

[0016] The lens adapter ring of the utility model can be used to mount a lens to a camera body, solving the problem of camera body and lens connection failure caused by differences in bayonet mount design. In addition, because the lens adapter ring uses two thread groups to achieve macro adjustment, its macro range can be greater than that of adapter rings using a single thread group to achieve macro adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0018] Figure 1 This is a structural schematic diagram of a lens adapter ring according to an exemplary embodiment of the present utility model;

[0019] Figure 2 This is a structural diagram of the lens adapter from another perspective;

[0020] Figure 3 It is a partial cross-sectional view of the lens adapter ring;

[0021] Figure 4 This is an exploded view of the lens adapter;

[0022] Figure 5 This is a schematic diagram of the assembly of the fuselage clamping parts, driven ring, restraint parts, and driving ring;

[0023] Figure 6 It is a partial cross-sectional view of the fuselage clamping member, the driven ring, the restraining member, and the driving ring;

[0024] Figure 7 Schematic diagram of the structure of the drive ring;

[0025] Figure 8 This is a schematic diagram of the assembly of the fuselage clamp, drive ring, and travel limiter;

[0026] Figure 9It is a partial cross-sectional view of the fuselage clamping part, the drive ring, and the travel limiter;

[0027] Figure 10 It is a schematic diagram of the assembly of the fuselage clamping parts and the travel limit parts;

[0028] Figure 11 This is a schematic diagram of the assembly of the fuselage clamp, drive ring, travel limiter, control ring, and locking assembly;

[0029] Figure 12 A partial cross-sectional view of the fuselage clamp, drive ring, travel limiter, control ring, and locking assembly;

[0030] Figure 13 It is a structural diagram of the lens clamping assembly;

[0031] Figure 14 It is a partial cross-sectional view of the lens clamping assembly;

[0032] Figure 15 Schematic diagram of the structure of the lens mount ring;

[0033] Figure 16 The figure is a schematic diagram of the assembly of the control ring and the locking assembly;

[0034] Figure 17 Exploded view of both the control ring and the locking assembly.

[0035] Explanation of the accompanying drawings: 1. lens clamping assembly; 2. driving assembly; 3. body clamping member; 4. restraining member; 5. bayonet; 6. bayonet; 7. first thread; 8. second thread; 9. third thread; 10. fourth thread; 11. lens clamping ring; 12. spring; 13. driven ring; 14. groove; 15. guide groove; 16. linear guide; 17. driving ring; 18. travel limiter; 19. stop; 20. block; 21. control ring; 22. locking assembly; 23. lock mouth; 24. lock tongue; 25. spring; 26. base; 27. first ring portion; 28. first ring platform portion; 29. first annular guide portion; 30. second ring portion; 31. second ring platform portion; 32. second annular guide portion. DETAILED DESCRIPTION

[0036] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but are not to be construed as limiting the present invention. Those skilled in the art may make various changes, modifications, substitutions, and variations to these embodiments without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the claims and their equivalents.

[0037] The terms "center", "longitudinal", "lateral", "length", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like mentioned or may be mentioned in the description of the present invention indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Furthermore, the terms "include," "comprising," and any variations thereof are intended to cover non-exclusive inclusions.

[0039] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted" and "connected" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] A lens adapter ring according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0041] See also Figures 1 to 4 According to an embodiment of the present invention, a lens adapter ring includes a lens mounting assembly 1, a drive assembly 2, a camera body mounting member 3, and a restraining member 4. The lens mounting assembly 1 is formed with a bayonet 5 that can engage with a lens. Specifically, the bayonet 5 is mated with the bayonet at the end of the lens to enable the lens adapter ring to be mounted on the lens. Because the bayonet designs of some lens brands are not completely consistent, in actual use, the bayonet 5 of the lens mounting assembly 1 needs to match the bayonet of the lens to be mounted.

[0042] The camera body connector 3 is formed with a bayonet 6 that can mate with the camera body. Specifically, the bayonet 6 mates with the camera body's bayonet to mount the lens adapter on the camera body. The bayonet design of some camera bodies varies, so in actual use, the bayonet 6 of the camera body connector 3 must match the bayonet of the camera body to which it is mounted.

[0043] By connecting the lens adapter to both the lens and the camera body, you can mount the lens to the camera body through the lens adapter, thus resolving the issue of camera body and lens not being able to connect due to differences in the mount design. For example, a Leica M series lens can be mounted on a Fujifilm GFX series camera using the lens adapter.

[0044] The lens mounting assembly 1 is formed with a first thread 7 that rotates in a first rotational direction. The drive assembly 2 is formed with a second thread 8 that rotates in the first rotational direction, and the second thread 8 cooperates with the first thread 7. The drive assembly 2 is also formed with a third thread 9 that rotates in a second rotational direction. The body mounting part 3 is formed with a fourth thread 10 that rotates in the second rotational direction, and the fourth thread 10 cooperates with the third thread 9. The first thread 7 and the second thread 8 can both be left-handed threads, and the third thread 9 and the fourth thread 10 can both be right-handed threads; alternatively, the first thread 7 and the second thread 8 can both be right-handed threads, and the third thread 9 and the fourth thread 10 can both be left-handed threads.

[0045] The restraining member 4 is used to prevent the lens mount assembly 1 and the body mount 3 from rotating in response to the rotation of the drive assembly 2. Therefore, rotating the drive assembly 2 can cause the lens mount assembly 1 and the body mount 3 to move. The lens adapter ring forms a light channel for light to travel from the area surrounded by the bayonet 5 of the lens mount assembly 1 to the area surrounded by the bayonet 6 of the body mount 3. In this embodiment, the light channel is located in the middle of the lens adapter ring. During rotation of the drive assembly 2, the bayonet 5 of the lens mount assembly 1 and the bayonet 6 of the body mount 3 move closer to or further away from each other. For example, when the drive assembly 2 rotates clockwise, the bayonet 5 of the lens mount assembly 1 and the bayonet 6 of the body mount 3 move closer to each other; when the drive assembly 2 rotates counterclockwise, the bayonet 5 of the lens mount assembly 1 and the bayonet 6 of the body mount 3 move further away from each other. Thus, macro adjustment can be achieved by rotating the drive assembly 2.

[0046] Because the lens adapter uses two thread groups to achieve macro adjustment, its macro travel can be greater than that of an adapter ring using a single thread group. For example, if the macro travel achieved by the thread group consisting of the first thread 7 and the second thread 8 is 3.5nm, and the macro travel achieved by the thread group consisting of the third thread 9 and the fourth thread 10 is 4.5nm, the total macro travel can be 8nm, which is greater than the macro travel achieved by the thread group consisting of only one thread and the second thread 8, or the macro travel achieved by the thread group consisting of only the third thread 9 and the fourth thread 10.

[0047] Moreover, in this embodiment, the projection of the second thread 8 on the plane passing through its thread axis overlaps with the projection of the third thread 9 on the plane passing through its thread axis, so the lens adapter ring can achieve a larger macro stroke with a smaller axial length.

[0048] See now Figures 13 to 15 The lens mounting assembly may include a lens mounting ring 11, a spring 12, and a driven ring 13. The lens mounting ring 11 and the driven ring 13 are fixedly connected, for example, by bolts, and the lens mounting ring 11 and the driven ring 13 jointly constrain the spring 12 disposed between the lens mounting ring 11 and the driven ring 13.

[0049] In this embodiment, the end surface where the lens mount ring 11 and the driven ring 13 meet is formed with a groove 14 that mates with the spring 12. This groove 14 limits the rotation of the spring 12 relative to the lens mount ring 11. Both the lens mount ring 11 and the driven ring 13 can simultaneously abut against the spring 12 to limit axial movement of the spring 12 relative to the lens mount ring 11. In another embodiment, both the lens mount ring 11 and the driven ring 13 can limit axial movement of the spring 12 relative to the lens mount ring 11 to a small range.

[0050] The bayonet 5 of the lens mount assembly is formed on the inner peripheral wall of the lens mount ring 11 , and the first thread 7 is formed on the outer peripheral wall of the driven ring 13 .

[0051] See now Figure 1 、 Figure 2 、 Figure 5 and Figure 6 In this embodiment, the restraining member 4 is fixedly connected to the body clamping member 3, such as by bolts. The lens clamping ring 11 and the driven ring 13 both form a guide groove 15. The restraining member 4 includes a linear guide portion 16 that can simultaneously extend into the guide groove 15 of the lens clamping ring 11 and the guide groove 15 of the driven ring 13. Of course, the linear guide portion 16 must have sufficient length; the linear guide portion 16 matches the guide groove 15 of the lens clamping ring 11 and the guide groove 15 of the driven ring 13. The extension direction of the linear guide portion 16 is parallel to the extension direction of the light channel, so that the lens clamping assembly 1 can only move relative to the body clamping member 3 along the extension direction of the linear guide portion 16, that is, along the extension direction of the light channel.

[0052] In another embodiment, the lens mounting ring 11 and the driven ring 13 are both formed with guide holes, and the linear guide portion 16 can simultaneously extend into the guide holes of the lens mounting ring 11 and the guide holes of the driven ring 13; the linear guide portion 16 matches the guide holes of the lens mounting ring 11 and the guide holes of the driven ring 13.

[0053] In another embodiment, the restraining member 4 is fixedly connected to the lens mounting ring 11 or the driven ring 13 , the body mounting member 3 is formed with a guide groove or a guide hole, and the linear guide portion 16 extends into the guide groove or the guide hole of the body mounting member 3 .

[0054] See now Figure 3 、 Figure 5 、 Figure 6 ,and Figure 7 The drive assembly 2 includes a drive ring 17, the second thread 8 is formed on the inner circumferential wall of the drive ring 17, and the third thread 9 is formed on the outer circumferential wall of the drive ring 17. The body clip 3 is generally annular, and the fourth thread 10 is formed on the inner circumferential wall of the body clip 3. That is, the drive ring 17 is threadedly connected to the body clip 3, and the drive ring 17 is threadedly connected to the driven ring 13. Therefore, rotation of the drive ring 17 can cause the driven ring 13 to move relative to the body clip 3 along the extension direction of the light channel, thereby causing the lens clip assembly 1 to move relative to the body clip 3 along the extension direction of the light channel.

[0055] See now Figure 3 、 Figure 8 、 Figure 9 ,and Figure 10 The drive assembly 2 may further include a stroke limiter 18, which is fixedly connected to the drive ring 17, such as by bolts, and is used to limit the rotation angle of the drive ring 17. Specifically, in this embodiment, the stroke limiter 18 is generally annular, and its outer peripheral wall is formed with two stoppers 19. The fuselage clamping member 3 is provided with a stopper 20. When the drive ring 17 is at the starting angular position or the terminal angular position of its rotation angle range, the stopper 20 abuts against the corresponding stopper 19 to prevent the drive ring 17 from rotating beyond the limited angular range.

[0056] See now Figure 3 、 Figure 11 ,and Figure 12 The drive assembly 2 may further include a control ring 21. The outer peripheral wall of the control ring 21 may be formed with strip-shaped protrusions distributed along the circumferential direction to increase the friction coefficient of the outer peripheral wall of the rotating control ring 21. The control ring 21 is fixedly connected to the stroke limiter 18, such as by bolts. The control ring 21 covers the other end of the body clip 3 away from the end of the bayonet 6 of the body clip 3. Since the stroke limiter 18 is fixedly connected to the drive ring 17, the drive ring 17 can be rotated synchronously by rotating the control ring 21, thereby prompting the lens clip assembly 1 to move relative to the body clip 3 along the extension direction of the light channel.

[0057] See now Figure 2 、 Figure 16 ,and Figure 17The lens adapter ring further includes a locking assembly 22, which is mounted on the control ring 21. The body clip 3 is formed with a locking notch 23. The locking tongue 24 of the locking assembly 22 can extend into or out of the locking notch 23 to lock or unlock the relative position of the body clip 3 and the control ring 21. Because the body clip 3 and the drive assembly 2 are threadedly connected via the third and fourth threads 9 and 10, the drive assembly 2 can rotate relative to the body clip 3, that is, the control ring 21 can rotate relative to the body clip 3. The addition of the locking assembly 22 facilitates removal of the lens adapter ring from the camera body.

[0058] In this embodiment, the locking assembly 22 includes a spring element 25, a locking tongue 24, and a base 26. The base 26 has a mounting hole formed therein, and the locking tongue 24 is partially mounted within the mounting hole. The spring element 25 is used to force the locking tongue 24 to move away from the base 26, thereby maintaining the locking tongue 24 in an extended position in the absence of external forces. The base 26 can be fixed to the control ring 21 via bolts. It should be understood that the locking assembly 22 can also adopt other structures, which are not listed here.

[0059] See now Figure 12 In this embodiment, the fuselage clip 3 includes a first ring portion 27. The fourth thread 10 is formed on the inner circumferential wall of the first ring portion 27. The bayonet 6 of the fuselage clip 3 is formed at one end of the first ring portion 27. The edge of the other end of the first ring portion 27 extends radially outward to form a first annular platform 28. The fuselage clip 3 also includes a first annular guide portion 29 fixed to the first annular platform 28 for guiding the control ring 21 to cover the end of the fuselage clip 3 away from the bayonet 6 of the fuselage clip 3.

[0060] The drive ring 17 includes a second ring portion 30. The second thread 8 is formed on the inner circumferential wall of the second ring portion 30, and the third thread 9 is formed on the outer circumferential wall of the second ring portion 30. The drive ring 17 also includes a second annular land portion 31 extending radially outward from one end edge of the second ring portion 30. The second annular land portion 31 can abut against the first annular land portion 28. The drive ring 17 also includes a second annular guide portion 32 fixed to the second annular land portion 31 for guiding the travel limiter 18 mounted on the drive ring 17.

[0061] The lens adapter ring of the present invention allows the lens to be mounted on the camera body, resolving the issue of camera body and lens connection issues caused by differences in bayonet mount design. Furthermore, because the lens adapter ring utilizes two thread groups for macro adjustment, it offers a greater macro range compared to adapter rings that utilize a single thread group for macro adjustment.

Claims

1. A lens adapter ring, characterized by: The camera body is mounted on a rear camera frame, and the rear camera frame is mounted on a rear camera frame. The camera body is mounted on a rear camera frame, and the rear camera frame is mounted on a rear camera frame. The camera body is mounted on a rear camera frame, and the rear camera frame is mounted on a rear camera frame. The camera body is mounted on a rear camera frame, and the rear camera frame is mounted on a rear camera frame. The camera body is mounted on a rear camera frame, and the rear camera frame is mounted on a rear camera frame.

2. The lens adapter according to claim 1, wherein: A projection of the second thread on a plane passing through the thread axis thereof overlaps with a projection of the third thread on a plane passing through the thread axis thereof.

3. The lens adapter according to claim 1 or 2, characterized in that: The lens mounting assembly includes a lens mounting ring, a spring, and a driven ring; the lens mounting ring and the driven ring are fixedly connected, and the two together constrain the spring arranged between the lens mounting ring and the driven ring; the first thread is formed on the outer peripheral wall of the driven ring.

4. The lens adapter according to claim 3, wherein: The restraining member is fixedly connected to the body clamping member; the lens clamping ring and / or the driven ring form a guide groove or guide hole, and the restraining member includes a linear guide portion extending into the guide groove or guide hole of the lens clamping ring, and / or, extending into the guide groove or guide hole of the driven ring, and the extending direction of the linear guide portion is parallel to the extending direction of the light channel.

5. The lens adapter ring according to claim 3, wherein: The driving assembly includes a driving ring, the second thread is formed on the inner circumferential wall of the driving ring, and the third thread is formed on the outer circumferential wall of the driving ring; the fuselage clamping part is generally annular, and the fourth thread is formed on the inner circumferential wall of the fuselage clamping part.

6. The lens adapter ring according to claim 5, characterized in that: The driving assembly further includes a stroke limiting member, which is fixedly connected to the driving ring and is used to limit the rotation angle of the driving ring.

7. The lens adapter according to claim 6, wherein: The stroke limiter is generally annular, and two stop portions are formed on its outer peripheral wall. The body clamping part is provided with a stop block. When the drive ring is at the starting angle position or the terminal angle position of its rotation angle, the stop block abuts against the corresponding stop portion to prevent the drive ring from rotating beyond the restricted angle range.

8. The lens adapter according to claim 6, wherein: The driving assembly further comprises a control ring, which is directly or indirectly fixedly connected to the driving ring and covers the other end of the fuselage clip away from the end where the clip of the fuselage clip is located.

9. The lens adapter ring according to claim 8, characterized in that: It also includes a locking component, which is installed on the control ring. The fuselage clip is formed with a locking hole. The locking tongue of the locking component can extend into or leave the locking hole to lock the relative position of the fuselage clip and the control ring, or release the lock on the relative position of the fuselage clip and the control ring.

10. The lens adapter ring according to claim 8, wherein: The fuselage clamping member includes a first ring portion, the fourth thread is formed on the inner circumferential wall of the first ring portion, the bayonet of the fuselage clamping member is formed at one end of the first ring portion, and the edge of the other end of the first ring portion extends radially outward to form a first ring platform portion, and the fuselage clamping member also includes a first annular guide portion fixed on the first ring platform portion, for guiding the control ring to cover the other end of the fuselage clamping member away from the bayonet of the fuselage clamping member; the driving ring includes a second ring portion, the second thread is formed on the inner circumferential wall of the second ring portion, and the third thread is formed on the outer circumferential wall of the second ring portion; the driving ring also includes a second ring platform portion formed along the edge of one end of the second ring portion radially extending outward, and the second ring platform portion can abut against the first ring platform portion; the driving ring also includes a second annular guide portion fixed on the second ring platform portion, for guiding the stroke limiter to be installed on the driving ring.

Images