Crimping tools

Abstract

The present application relates to a crimping tool, comprising a crimping ring, a driver and a male part. The crimping ring has free ends that can move relative to each other. The driver has a driving end, and the driver is configured to drive the crimping ring by the driving end cooperating with the free end of the crimping ring. The male part is movably connected to or fitted in one of the free end and the driving end, and can engage with a recessed portion provided on the other of the free end and the driving end. The male part is shaped so that the driver can drive the crimping ring at a certain angle relative to the plane in which the crimping ring is located.

Description

Technical Field

[0001] The present disclosure relates to a crimping tool, and in particular to a crimping tool for crimping, for example, a pipe. Background Art

[0002] The contents in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] Pipe fittings are commonly used components in transportation systems for conveying fluids such as water and oil. When connecting pipe fittings, a crimping tool is often used to crimp and lock the pipe fitting interface. The crimping tool includes a crimping ring for crimping the pipe fitting and a driver for driving the crimping ring. When crimping the pipe fitting, the driver engages with the crimping ring and drives the crimping ring to close.

[0004] Usually, after the driver is engaged with the crimping ring, the movement of the driver relative to the crimping ring is restricted, especially the driver cannot swing along the direction of the central axis of the crimping ring. Therefore, the operation of the driver is restricted in a limited operating space.

[0005] Even if the driver can move within a small range relative to the crimping ring in some crimping tools, sliding friction will occur. As a result, the driver and the crimping ring will wear severely and the friction loss will be high. Summary of the invention

[0006] One object of one or more embodiments of the present disclosure is to provide a crimping tool that can be flexibly manipulated and reduces friction loss.

[0007] Another object of one or more embodiments of the present disclosure is to provide a crimping tool with a simplified structure and / or reduced cost.

[0008] In order to achieve one or more of the above-mentioned purposes, according to one aspect of the present disclosure, a crimping tool is provided, comprising a crimping ring, a driver and a convex piece. The crimping ring has free ends that can move relative to each other. The driver has a driving end, and the driver is configured to drive the crimping ring by cooperating with the free end of the crimping ring through the driving end. The convex piece is movably connected to or fitted in one of the free end and the driving end, and can engage with a recessed portion provided on the other of the free end and the driving end. The convex piece is shaped so that the driver can drive the crimping ring at a certain angle relative to the plane in which the crimping ring is located.

[0009] According to the above-mentioned crimping tool disclosed in the present invention, since during crimping, the engagement of the convex part with the concave part enables the driver to drive the crimping ring at a certain angle relative to the plane where the crimping ring is located (that is, at a position inclined relative to the plane where the crimping ring is located), the operation of the crimping tool (especially the operation of the driver) becomes flexible, and the operating space is increased.

[0010] Furthermore, since the convex member can move, such as roll or rotate, friction loss can be significantly reduced during operation of the crimping tool, thereby improving the working efficiency of the crimping tool.

[0011] In some examples, the male member has an outer surface that is at least partially spherical. A spherical male member facilitates engagement with the female portion at different angular positions. Furthermore, a spherical male member facilitates manufacturing.

[0012] In some examples, the male member is connected to the free end of the crimping ring via a connector, and the female portion is disposed on the driving end of the driver.

[0013] The male member has a central through hole allowing the connecting member to pass through.

[0014] In some examples, each of the free ends includes opposing lugs extending therefrom, and the opposing lugs are provided with openings therein for receiving the connector. The male member may be located between the lugs, thereby saving space.

[0015] In some examples, the crimping tool further comprises a retaining member for retaining the connector on the lug. For example, the retaining member may be a snap ring. In this way, the male member may be connected to the crimping ring in a detachable manner, which facilitates replacement of the male member.

[0016] In some examples, the connecting member is a pin, the pin is provided with a groove at each end thereof, and the snap ring is engaged with the groove outside the lug.

[0017] In some examples, the free end of the crimping ring is provided with a receiving portion for receiving the male member. By providing the receiving portion, the male member can be well and stably positioned, and thus the alignment between the driving end of the driver and the free end of the crimping ring is facilitated. In addition, the connection structure of connecting the male member to the driver or the crimping ring can be simplified.

[0018] In some examples, the crimping tool further includes a retaining device for retaining the male member within the receiving portion.

[0019] In some examples, the retaining device is annular and has an inner diameter that is smaller than an outer diameter of the male member.

[0020] In some examples, the crimping tool further includes a fastener for securing the retaining device to the free end.

[0021] In some examples, a driving end of the driver is provided with a receiving portion for receiving the convex member.

[0022] In some examples, the receiving portion has an edge for retaining the convex member in the receiving portion, and the edge is formed by a shrinking process after the convex member is fitted in the receiving portion. In this example, only the edge of the receiving portion needs to be processed to reduce its size, so the retaining member, the connecting member, etc. can be omitted, making the structure simpler.

[0023] In some examples, the crimping tool further comprises a nut for retaining the convex member in the receiving portion, wherein the nut can be threadedly engaged with the receiving portion. The nut makes the crimping tool easier to disassemble and assemble.

[0024] In some examples, the nut has a cylindrical portion and a stopper. The cylindrical portion is provided with an internal thread. The stopper extends radially inward from one end of the cylindrical portion to retain the convex member in the receiving portion. The receiving portion is provided with an external thread at its edge that engages with the internal thread of the cylindrical portion.

[0025] Further areas of applicability will become apparent from the description provided herein.It should be understood that the specific examples and implementations described in this section are for illustrative purposes only and are not intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described in this section are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.

[0027] Figures 1A to 1C They are respectively a stereoscopic schematic diagram, a cross-sectional schematic diagram and a partially exploded schematic diagram of a crimping tool according to a first embodiment of the present disclosure, wherein the crimping ring and the driver are in an unengaged and uncrimped state.

[0028] Figure 2A and Figure 2B They are respectively a perspective schematic diagram and a cross-sectional schematic diagram of a crimping tool according to a first embodiment of the present disclosure, wherein a crimping ring and a driver are in an engaged but not crimped state.

[0029] Figure 3A and Figure 3B 1 and 2 are respectively a perspective schematic diagram and a cross-sectional schematic diagram of a crimping tool according to a first embodiment of the present disclosure, wherein a crimping ring and a driver are in an engaged and crimped state.

[0030] FIG. 4A to FIG. 4C Different operating positions of the driver of the crimping tool according to the first embodiment of the present disclosure relative to the crimping ring are respectively shown.

[0031] FIG. 5A to FIG. 5C They are respectively a stereoscopic schematic diagram, a cross-sectional schematic diagram and a partially exploded schematic diagram of a crimping tool according to a second embodiment of the present disclosure, wherein the crimping ring and the driver are in an unengaged and uncrimped state.

[0032] Figure 6 is a schematic cross-sectional view of a crimping tool according to a third embodiment of the present disclosure, wherein the crimping ring and the driver are in an unengaged, uncrimped state.

[0033] FIG. 7A to FIG. 7C It is shown Figure 6 Schematic diagram of the edge shaping of the accommodating portion of the driver.

[0034] Fig. 8A and Figure 8B They are Figure 6 A partial cross-sectional view and exploded schematic diagram of a variation of the drive end of a drive. DETAILED DESCRIPTION

[0035] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, and uses. It should be understood that in the drawings, like reference numerals indicate similar or identical components or features.

[0036] The following will refer to Figures 1A to 4C A crimping tool 10 according to a first embodiment of the present disclosure will be described. Figures 1A to 1C The structure of the crimping tool 10 is shown; FIG. 2A to FIG. 3B The state in which the driver 10B is engaged with the crimping ring 10A and drives the crimping ring 10A is shown; FIG. 4A to FIG. 4C Different operating positions of the driver 10B relative to the crimp ring 10A are shown.

[0037] like Figures 1A to 1C As shown, the crimping tool 10 includes a crimping ring 10A and a driver 10B. The crimping ring 10A is configured to crimp workpieces such as pipes to connect them together. The driver 10B is configured to drive the crimping ring 10A to close it for crimping.

[0038] The crimping ring 10A includes an annular body 110 having a central axis A1. The annular body 110 is generally located in a plane P perpendicular to the central axis A1. Therefore, the plane P refers to the plane in which the crimping ring 10A is located. The annular body 110 includes three arcuate segments 111, 112 and 113. The arcuate segment 111 is pivotally connected to the arcuate segment 112 via a pivot 114, and the arcuate segment 112 is pivotally connected to the arcuate segment 113 via a pivot 115. The free end 111a of the arcuate segment 111 and the free end 113a of the arcuate segment 113 constitute the two free ends of the crimping ring 10A.

[0039] The free ends of the crimping ring 10A can move relative to each other. The free end 111a of the arc segment 111 can move away from the free end 113a of the arc segment 113, thereby opening the crimping ring 10A to receive or remove a workpiece, and can move toward the free end 113a of the arc segment 113, thereby closing the crimping ring 10A to crimp the workpiece.

[0040] The driver 10B includes a first driving arm 131 and a second driving arm 133. The first driving arm 131 and the second driving arm 133 are connected together through an intermediate member 132. The first driving arm 131 is pivotally connected to the intermediate member 132 via a pivot 134, and the second driving arm 133 is pivotally connected to the intermediate member 132 via a pivot 135. When the driver 10B drives the crimping ring 10A, a driving roller (not shown) moves toward the crimping ring 10A between the first driving arm 131 and the second driving arm 133 on the side of the intermediate member 132 opposite to the crimping ring 10A, so that the first driving arm 131 and the second driving arm 133 rotate around the pivot 134 and the pivot 135, respectively, thereby driving the free end of the crimping ring 10A to close.

[0041] The first driving arm 131 has a driving end 131a for driving the free end 111a of the crimping ring 10A. The second driving arm 133 has a driving end 133a for driving the free end 113a of the crimping ring 10A. When the first driving arm 131 and the second driving arm 133 rotate around the pivot 134 and the pivot 135 respectively, the driving end 131a and the driving end 133a can move away from each other to release the crimping ring 10A, and can move toward each other to drive the crimping ring 10A to close.

[0042] To facilitate the driving and operation of the crimping tool 10, a convex member 150 is provided between the driving end 131a and the free end 111a and between the driving end 133a and the free end 113a. The convex member 150 is configured to allow the driver 10B to drive the crimping ring 10A at different operating angles relative to the plane P (i.e., a plane perpendicular to the central axis A1), and to roll or rotate during crimping to reduce friction loss.

[0043] Conventional crimping tools allow the driver to drive the crimping ring only in plane P (i.e., the angle relative to plane P is 0). In contrast, the crimping tool 10 of the present application also allows the driver 10B to drive the crimping ring 10A at a certain angle relative to plane P (i.e., at a position inclined relative to plane P).

[0044] exist Figures 1A to 4C In the example shown, the male member 150 is connected to or installed at the free end 111a of the arc segment 111 and the free end 113a of the arc segment 113 of the crimping ring 10A. The driving end 131a of the first driving arm 131 and the driving end 133a of the second driving arm 133 are respectively provided with a recessed portion 136 that can engage with the male member 150. When crimping the workpiece, the recessed portions 136 of the driving ends 131a, 133a are respectively engaged with the male member 150 at the free ends 111a, 113a, thereby driving the free ends 111a, 113a.

[0045] Since the structures at the two free ends 111 a and 113 a are the same, only one free end 111 a will be described below.

[0046] The free end portion 111a of the crimping ring 10A has lugs 166 extending outward from both axial end surfaces, respectively. The male member 150 is connected between the lugs 166 of the free end portion 111a via a pin 152 as a connecting member.

[0047] The male member 150 may have a spherical or partially spherical outer surface. The female portion 136 may have a partially spherical inner surface to engage with the outer surface of the male member 150. The inner diameter of the female portion 136 may be greater than or equal to the outer diameter of the male member 150.

[0048] The male member 150 may also have a central through hole 1502 for receiving the pin 152. The lug 166 is provided with an opening 167 for receiving the pin 152. By inserting the pin 152 into the central through hole 1502 of the male member 150 and the opening 167 of the lug 166, the male member 150 is connected to the free end 111a of the crimping ring 10A.

[0049] In order to fix or hold the pin 152 on the lug 166, a snap ring 154 as a retaining member may be provided. A groove 1522 engaged with the snap ring 154 may be provided on the end of the pin 152. After the pin 152 is inserted into the opening 167 of the lug 166 and the central through hole 1502 of the male member 150, the snap ring 154 is engaged in the groove 1522 at the outer side of the lug 166, thereby preventing the pin 152 and the male member 150 from falling off from the crimping ring 10A.

[0050] After the male member 150 is mounted to the free end portion 111 a of the crimping ring 10A, the male member 150 can rotate relative to the pin 152 and / or the pin 152 can rotate relative to the lug 166 .

[0051] See below FIG. 2A to FIG. 3B The working process of the crimping tool 10 will be described. Figure 2A and Figure 2B The crimping ring 10A and the driver 10B are shown in a state of being engaged in preparation for crimping; Figure 3A and Figure 3B The state where the driver 10B drives the crimping ring 10A to close to complete the crimping is shown.

[0052] Before crimping, the crimping ring 10A and the driver 10B are in a non-engaged position. At this time, the crimping ring 10A is opened due to the torsion springs at the pivots 114 and 115 to receive the workpiece to be crimped. Correspondingly, the driving ends 131a and 133a of the driver 10B are also away from each other.

[0053] When the workpiece needs to be crimped, the driver 10B is moved toward the crimping ring 10A, and the recessed portions 136 of the driving ends 131a and 133a of the driver 10B are respectively engaged with the convex pieces 150 at the free ends 111a and 113a of the crimping ring 10A, as shown in FIG. Figure 2A and Figure 2B shown.

[0054] After the concave portions 136 of the driving ends 131a and 133a are engaged with the convex member 150, a force is applied to the first driving arm 131 and the second driving arm 133 of the driver 10B to rotate them around the pivots 134 and 135, respectively, that is, the driving ends 131a and 133a are moved toward each other. Under the drive of the driving ends 131a and 133a, the free ends 111a and 113a of the crimping ring 10A also move toward each other to crimp the workpiece. Generally, the crimping work is completed when the free ends 111a and 113a are driven to abut against each other, that is, when the crimping ring 10A is fully closed, as shown in FIG. Figure 3A and Figure 3B shown.

[0055] During the crimping process, the arcuate section of the crimping ring 10A is closed around the central axis A1. Since the convex piece 150 according to the present disclosure can rotate relative to the crimping ring 10A, for example, the convex piece 150 rotates relative to the pin 152, or the convex piece 150 and the pin 152 rotate together relative to the crimping ring 10A, the friction loss can be significantly reduced and thus the working efficiency of the crimping tool 10 can be improved. In this way, the service life of the convex piece 150 can be extended. In some cases, the convex piece 150 may also rotate to a certain extent relative to the concave portion 136, which can also reduce the friction loss therebetween and improve the working efficiency of the crimping tool 10.

[0056] According to the crimping tool 10 of the present disclosure, since the convex member 150 has a spherical outer surface, the driver 10B can be operated at different positions relative to the crimping ring 10A. FIG. 4A to FIG. 4C The different operating positions of the driver 10B are described. Figure 4A In FIG. 1 , the driver 10B is tilted or swung toward the inside of the paper relative to the crimping ring 10; Figure 4B In the embodiment, the driver 10B and the crimping ring 10 are substantially in the same plane (ie, plane P); Figure 4C In the figure, the actuator 10B is tilted or swung toward the outside of the paper relative to the crimping ring 10.

[0057] The spherical concave portion 136 of the driver 10B can be oriented relative to a plane perpendicular to the central axis A1 (eg Figure 1A The spherical convex member 150 is engaged with the spherical convex member 150 at a position at a certain angle to the plane P shown in FIG. When the angle is 0, the driver 10B is coplanar with the crimping ring 10A, that is, both are in the plane P, as shown in FIG. Figure 4B If the angle is greater than 0 but less than or equal to 90 degrees, the driver 10B is tilted in one direction relative to the plane P, for example, Figure 4C If the angle is less than 0 but greater than or equal to -90 degrees, the driver 10B is tilted in the opposite direction relative to the plane P, for example, Figure 4A It should be understood that the angle can be set as required.

[0058] As described above, since the driver 10B can swing left and right relative to the crimping ring 10A during operation, the operation of the driver 10B becomes flexible. In other words, the driver 10B can engage with the crimping ring 10A at a desired angle relative to the crimping ring 10A and drive the crimping ring 10A. In this way, the driver 10B is no longer limited to operating in the plane P, which is particularly advantageous for certain specific confined spaces.

[0059] The following will refer to FIG. 5A to FIG. 5CThe crimping tool 20 according to the second embodiment of the present disclosure is described. The crimping tool 20 includes a crimping ring 20A and a driver 20B. The crimping ring 20A has free ends 211a and 213a that can move relative to each other. The driver 20B has driving ends 231a and 233a that can move relative to each other. When the crimping tool 20 crimps the workpiece, the concave portions 236 of the driving ends 231a and 233a engage with the convex pieces 250 mounted on the free ends 211a and 213a and thereby drive the crimping ring 20A to close.

[0060] The driver 20B of the crimping tool 20 has the same structure as the driver 10B of the crimping tool 10 , and thus the driver 20B of the crimping tool 20 will not be described again.

[0061] The difference between the crimping tool 20 and the crimping tool 10 lies in the structure of the free end of the crimping ring and the male member. The structure of the crimping tool 20 that is different from the crimping tool 10 will be described below.

[0062] like FIG. 5A to FIG. 5C As shown, the crimping ring 20A of the crimping tool 20 includes three arcuate segments 211, 212 and 213. The two ends of the arcuate segment 212 are pivotally connected to the arcuate segments 211 and 213, respectively. The free end 211a of the arcuate segment 211 and the free end 213a of the arcuate segment 213 constitute the two free ends of the crimping ring 20A. The free ends of the crimping ring 20A can move relative to each other to open and close the crimping ring 20A.

[0063] The free ends 211a and 213a of the crimping ring 20A respectively include protrusions 2112 and 2132 extending radially outward. The protrusions 2112 and 2132 are each provided with a receiving portion 2114 for receiving the male member 250. Preferably, the receiving portion 2114 may have an inner surface that matches the outer surface of the male member 250.

[0064] The convex member 250 is a spherical member having a spherical outer surface, for example, a steel ball. Since the steel ball is a common part, the cost of the convex member can be reduced. When the convex member 250 is placed in the receiving portion 2114, the convex member 250 protrudes from the surfaces of the protrusions 2112 and 2132 so as to engage with the concave portion 236 of the driver 20B.

[0065] In order to hold the male member 250 in the receiving portion 2114, a retaining ring 252 may be provided as a retaining means. The retaining ring 252 has an inner diameter smaller than the diameter of the male member 250 to hold the male member 250 in the receiving portion 2114.

[0066] The crimping tool 20 may further include a screw 254 as a fastener for fixing the retaining ring 252 to the protrusions 2112 and 2132. Accordingly, a through hole 253 for the screw 254 to pass through is provided on the retaining ring 252, and a threaded hole 2116 for receiving the screw 254 is provided on the protrusions 2112 and 2132.

[0067] The crimping tool 20 has similar operation and advantages as the crimping tool 10, and will not be described in detail herein. In addition, the male parts of the crimping tools 10 and 20 are both detachably connected or accommodated on the free end of the crimping ring. Therefore, the male parts of the crimping tools 10 and 20 are easy to disassemble and install. For example, when the male part 150 or 250 is severely worn, it can be easily replaced.

[0068] The following will refer to Figures 6 to 7C The crimping tool 30 according to the third embodiment of the present disclosure is described. The crimping tool 30 is different from the crimping tool 20 in that the convex member is accommodated in the driving end of the driver and the retaining ring is omitted. The structure of the crimping tool 30 that is different from the crimping tool 20 will be described below. The parts of the crimping tool 30 that are the same as the crimping tool 20 will not be described again.

[0069] exist Figure 6 In the example shown, the driving ends 331a and 333a of the driver 30B of the crimping tool 30 are each provided with a receiving portion 3114 for receiving the convex member 350. The convex member 350 is received and held in the receiving portion 3114. The free ends 311a and 313a of the crimping ring 30A of the crimping tool 30 are each provided with a concave portion 336 that engages with the convex member 350 during the crimping operation.

[0070] FIG. 7A to FIG. 7C Shows Figure 6 First, the driving end portion 331a of the driver 30B is processed to form the accommodating portion 3114, such as Fig. 7A As shown. The receiving portion 3114 may optionally have a partially spherical inner surface. Fig. 7A In the embodiment, the convex member 350 has not been placed in the receiving portion 3114. Then, the convex member 350 is placed in the receiving portion 3114, as shown in FIG. Figure 7B As shown. Figure 7B In the embodiment, the diameter of the edge 3116 of the receiving portion 3114 is greater than or equal to the diameter of the convex member 350 so that the convex member 350 can be placed in the receiving portion 3114. In order to keep the convex member 350 in the receiving portion 3114 and prevent it from falling out of the receiving portion 3114, Figure 7CIn the embodiment, the edge 3116 of the receiving portion 3114 is processed to shrink the edge 3116 until the diameter of the edge 3116 is smaller than the diameter of the male member 350. For example, the edge 3116 of the receiving portion 3114 can be wrinkled and then flattened to reduce the size of the edge 3116.

[0071] The driving end portion 333a has the same structure and forming process as the driving end portion 331a, which will not be described in detail here.

[0072] The crimping tool 30 has similar operation and advantages as the crimping tools 10 and 20, and will not be described in detail herein. In addition, the crimping tool 30 has a simpler structure and is easy to manufacture.

[0073] Fig. 8A and Figure 8B Shows Figure 6 A variation of the drive end of the drive. Fig. 8A and Figure 8B As shown, the driving end portion 431a has a receiving portion 4114 for receiving the male member 450. The male member 450 is received and retained in the receiving portion 4114 by a nut 470.

[0074] The nut 470 includes a cylindrical portion 472 for connecting to the driving end portion 431a and a stopper portion 474 for preventing the male member 450 from falling out of the receiving portion 4114. The stopper portion 474 extends radially inward from one end of the cylindrical portion 472 so as to have an inner diameter smaller than the diameter of the male member 450. The cylindrical portion 472 is provided with an internal thread 4722. Accordingly, the edge 4116 of the receiving portion 4114 of the driving end portion 431a is provided with an external thread 4112 capable of engaging with the internal thread 4722 of the cylindrical portion 472.

[0075] After the male member 450 is placed in the receiving portion 4114 of the driving end portion 431a, the nut 470 is screwed onto the edge 4116 of the receiving portion 4114, thereby retaining the male member 450 in the receiving portion 4114. Therefore, in this variation, the assembly and disassembly of the nut 470 is very simple.

[0076] It should be understood that the structures of the various components of the crimping tool of the present invention are not limited to the specific examples shown in the drawings, as long as they can achieve the functions described herein. For example, the outer surface of the convex piece can have a curved shape other than a sphere, for example, an ellipsoidal shape. The specific shapes or sizes of the free end of the crimping ring and the driving end of the driver can be changed as needed. The crimping ring can be formed by two sections or more than three sections.

[0077] Although various embodiments of the present disclosure have been described in detail herein, it should be understood that the present disclosure is not limited to the specific embodiments described and shown in detail herein, and other modifications and variations can be implemented by those skilled in the art without departing from the essence and scope of the present disclosure. The various features of one embodiment can be combined with the features of another embodiment without contradiction, or a certain feature can be omitted. All these modifications and variations fall within the scope of the present disclosure. Moreover, all components, parts or features described herein can be replaced by other components, parts or features that are equivalent in structure and function.

Claims

1. A crimping tool, comprising: a crimping ring having free ends movable relative to each other; A driver having a driving end, wherein the driver is configured to drive the crimping ring by the driving end cooperating with the free end of the crimping ring; as well as a male member movably connected to or fitted in one of the free end and the drive end and capable of engaging with a recessed portion provided on the other of the free end and the drive end, wherein the convex member is shaped so that the driver can drive the crimping ring at a certain angle relative to the plane in which the crimping ring is located, Wherein, the outer surface of the convex part is spherical.

2. The crimping tool according to claim 1, wherein: The male piece is connected to the free end of the crimping ring via a connecting piece, and the female portion is provided on the driving end of the driver.

3. The crimping tool according to claim 2, wherein: The male member has a central through hole allowing the connecting member to pass through.

4. The crimping tool according to claim 3, wherein: Each of the free ends includes opposing lugs extending therefrom, and The opposing lugs are provided with openings therein for receiving the connecting member.

5. The crimping tool according to claim 4, wherein: The crimping tool also includes a retaining member for retaining the connector on the lug.

6. The crimping tool according to claim 5, wherein: The retaining member is a snap ring.

7. The crimping tool according to claim 6, wherein: The connecting member is a pin, and the pin is provided with a groove at each end thereof, and the snap ring is engaged with the groove outside the lug.

8. The crimping tool according to claim 1, wherein: The free end of the crimping ring is provided with a receiving portion for receiving the convex member.

9. The crimping tool according to claim 8, wherein: The crimping tool further comprises a retaining device for retaining the male member in the receiving portion.

10. The crimping tool according to claim 9, wherein: The retaining device is annular and has an inner diameter that is smaller than the outer diameter of the male member.

11. The crimping tool according to claim 10, wherein: The crimping tool also includes a fastener for securing the retaining device to the free end.

12. The crimping tool according to claim 1, wherein: The driving end of the driver is provided with a receiving portion for receiving the convex member.

13. The crimping tool according to claim 12, wherein: The receiving portion has an edge for retaining the male member in the receiving portion, the edge being formed by a shrinking process after the male member is fitted in the receiving portion.

14. The crimping tool according to claim 12, wherein: The crimping tool further includes a nut for retaining the male member in the receiving portion, the nut being threadably engageable with the receiving portion.

15. The crimping tool according to claim 14, wherein: The nut has a cylindrical portion and a stopper portion, the cylindrical portion is provided with an internal thread, and the stopper portion extends radially inward from one end of the cylindrical portion to retain the convex member in the receiving portion. The receiving portion is provided at an edge thereof with an external thread engaged with the internal thread of the cylindrical portion.

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