Rod piece connecting structure

Abstract

The utility model relates to the field of mechanical connection, and discloses a rod piece connecting structure which comprises an outer sliding sleeve, an inner sliding sleeve and a rod piece, the outer sliding sleeve is sleeved on the inner sliding sleeve in an up-and-down movable mode, the side wall of the inner sliding sleeve is provided with a mounting groove which is communicated in the radial direction, a movable piece which moves in the radial direction is arranged in the mounting groove, and a limiting cavity which is suitable for being movably connected with the movable piece is arranged in the outer sliding sleeve. The side wall of the rod piece is provided with a limiting hole suitable for being movably connected with the movable piece. During installation, the rod piece is axially inserted into the inner sliding sleeve, the outer wall of the rod piece pushes the movable piece to move in the radial direction, the movable piece is contained in the installation groove and the limiting cavity at the same time, the outer sliding sleeve slides along the inner sliding sleeve till the limiting hole is aligned with the installation groove in the radial direction, and the outer sliding sleeve pushes the movable piece to leave the limiting cavity and be contained in the installation groove and the limiting hole at the same time. And the inner sliding sleeve and the rod piece are fixed. The movable part moves back and forth in the radial direction among the mounting groove, the limiting cavity and the limiting hole, rapid disassembly and assembly can be achieved without the help of tools, and the stability of coaxial connection is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical connection technical field, specifically, a kind of rod connecting structure. BACKGROUND

[0002] Coaxial rod connecting is a common rod connecting form, widely used in furniture, tools, building and other fields, for realizing force transmission, positioning and position fixing between rods. However, the existing coaxial rod connecting structure has some problems in practical application. For example, in the scene needing frequent disassembly, such as tool head replacement or multi-rod installation, the existing connecting mode usually needs to use tools, resulting in complicated installation and disassembly process, reducing operation efficiency. SUMMARY

[0003] To solve at least one aspect of the above problems, the utility model first provides a kind of rod connecting structure, including outer slide cover, inner slide cover and rod, the outer slide cover is movably sleeved on the inner slide cover, the side wall of the inner slide cover is equipped with the installation slot of radial communication, the installation slot is equipped with the movable part of radial movement, the outer slide cover is equipped with the limiting cavity of movable connection with the movable part, the side wall of the rod is equipped with the limiting hole of movable connection with the movable part;When installing, the rod is axially inserted into the inner slide cover, the outer wall of the rod pushes the movable part and moves radially, so that the movable part is simultaneously accommodated in the installation slot and the limiting cavity, until the limiting hole is radially aligned with the installation slot, then the outer slide cover is slid along the inner slide cover, the outer slide cover pushes the movable part away from the limiting cavity and simultaneously accommodated in the installation slot and the limiting hole, so that the inner slide cover and the rod are fixed.

[0004] Optionally, it further includes elastic member, the bottom of the outer slide cover is connected with bottom cover, the bottom cover is movably connected with the inner slide cover, the upper and lower ends of the elastic member are respectively abutted with the inner slide cover and the bottom cover;When the bottom cover is pressed upward, the limiting cavity, the installation slot and the limiting hole are radially aligned, the rod and the inner slide cover are in detachable state;When the bottom cover is released, the elastic member drives the outer slide cover to slide to make the limiting cavity and the installation slot radially misaligned, the inner slide cover and the rod are in locked state.

[0005] Optionally, the bottom cover is provided with connecting column, the bottom of the elastic member is sleeved on the connecting column, the bottom of the inner slide cover is recessed with connecting slot, and the upper end of the elastic member is accommodated in the connecting slot.

[0006] Optionally, the bottom of the inner sliding sleeve is provided with a flange, the outer sliding sleeve is internally provided with an abutting portion adapted to abut against the flange, when the flange and the abutting portion abut against each other, the limiting cavity and the mounting groove are radially misaligned, and the movable element is simultaneously accommodated between the mounting groove and the limiting hole.

[0007] Optionally, the movable element is cylindrical, the mounting groove comprises a limiting portion for limiting the front and back sidewalls of the movable element, the mounting groove is provided with an opening, and the vertical cross-sectional diameter of the opening is smaller than the vertical cross-sectional diameter of the movable element, so as to prevent the movable element from falling out of the opening.

[0008] Optionally, the limiting cavity is provided with a guide wall, the guide wall is inclined downward from inside to outside, and the guide wall is adapted to push the movable element away from the limiting cavity.

[0009] Optionally, the bottom of the rod element is provided with a chamfer, and the chamfer facilitates the insertion of the rod element into the inner sliding sleeve.

[0010] Optionally, the outer shell is further provided, the outer shell is through-penetrated from top to bottom, the outer shell comprises a first accommodating cavity and a second accommodating cavity which are in communication with each other, the diameter of the first accommodating cavity is adapted to the diameter of the rod element, the outer sliding sleeve and the inner sliding sleeve are accommodated in the second accommodating cavity, and the upper end of the inner sliding sleeve abuts against the inner top wall of the second accommodating cavity.

[0011] Optionally, the rod element comprises a first rod body and a second rod body which are coaxially arranged, the limiting hole is arranged on the outer wall of the first rod body, the cross section of the first rod body is in the shape of a runway column, so that the limiting hole can be aligned with the mounting groove when the first rod body is inserted into the inner sliding sleeve, and the second rod body facilitates the handheld or connection of external parts.

[0012] Optionally, the diameter of the first rod body is smaller than the diameter of the second rod body, the first rod body is sleeved with a gasket and a buffer pad, the upper and lower ends of the gasket abut against the second rod body and the buffer pad respectively, and the lower end of the buffer pad abuts against the upper end of the outer shell.

[0013] Compared with the prior art, the rod element connecting structure in the utility model sets the mounting groove between the limiting cavity and the limiting hole, and realizes the detachable connection between the rod element and the inner sliding sleeve through the radial back-and-forth movement of the movable element between the mounting groove, the limiting cavity and the limiting hole, so that the quick installation and disassembly can be realized without the aid of tools, the stability of coaxial connection is ensured, the connection accuracy and strength are guaranteed, and the rod element connecting structure is suitable for various application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a locking state sectional view of the rod element connecting structure of the utility model embodiment.

[0015] Figure 2 The detachable state sectional view of the rod connecting structure of the embodiment of the utility model;

[0016] Figure 3 The explosion view of the rod connecting structure of the embodiment of the utility model;

[0017] Figure 4 The structure diagram of the inner sliding sleeve of the embodiment of the utility model;

[0018] Figure 5 The structure diagram of the rod of the embodiment of the utility model.

[0019] Explanation of reference signs:

[0020] 1, outer sliding sleeve;11, limiting cavity;111, guide wall;12, abutting portion;2, inner sliding sleeve;21, mounting groove;211, limiting portion;212, opening;22, connecting groove;23, flange;3, rod;31, first rod body;311, limiting hole;312, chamfer;32, second rod body;4, movable piece;5, elastic piece;6, bottom cover;61, connecting column;7, shell;71, first containing cavity;72, second containing cavity;8, gasket;9, buffer pad. Specific implementation

[0021] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below in combination with the drawings.

[0022] The embodiment of the utility model is provided with a coordinate system XYZ in the drawing, wherein the positive direction of X axis represents left, the reverse direction of X axis represents right, the positive direction of Y axis represents front, the reverse direction of Y axis represents back, the positive direction of Z axis represents upper, and the reverse direction of Z axis represents lower.

[0023] The embodiment of the utility model provides a kind of rod connecting structure, in combination with Figures 1-5As shown, including outer sleeve 1, inner sleeve 2 and rod 3, the outer sleeve 1 is movably sleeved on the inner sleeve 2, the side wall of the inner sleeve 2 is provided with a radially communicating installation groove 21, the installation groove 21 is provided with a radially movable movable part 4, the outer sleeve 1 is provided with a limiting cavity 11 suitable for the movable part 4, the side wall of the rod 3 is provided with a limiting hole 311 suitable for the movable part 4; during installation, the rod 3 is axially inserted into the inner sleeve 2, the outer wall of the rod 3 pushes the movable part 4 to move radially, so that the movable part 4 is simultaneously accommodated in the installation groove 21 and the limiting cavity 11, until the limiting hole 311 is radially aligned with the installation groove 21, then the outer sleeve 1 is slid along the inner sleeve 2, the outer sleeve 1 pushes the movable part 4 away from the limiting cavity 11 and simultaneously accommodates in the installation groove 21 and the limiting hole 311, so that the inner sleeve 2 and the rod 3 are fixed.

[0024] As shown in the drawings, Figures 1-3 In this embodiment, the outer sleeve 1 and the inner sleeve 2 are coaxially arranged, the movable part 4 and the installation groove 21 are both two and are symmetrically distributed on the inner sleeve 2, and the number and position of the limiting cavity 11 and the limiting hole 311 are matched with the movable part 4.

[0025] In other embodiments, a plurality of movable parts 4 can be provided in the axial direction to realize multi-stage quick release; on the same level, the installation groove 21 can be provided with a plurality of angles, such as three circumferentially uniformly distributed installation grooves 21 or four circumferentially uniformly distributed installation grooves 21.

[0026] In the rod connecting structure, the installation groove 21 is arranged between the limiting cavity 11 and the limiting hole 311, the movable part 4 moves back and forth radially between the installation groove 21, the limiting cavity 11 and the limiting hole 311, the detachable connection between the rod 3 and the inner sleeve 2 is realized, the quick installation and disassembly can be realized without the aid of tools, the stability of coaxial connection is ensured, the connection precision and strength are guaranteed, and the rod connecting structure is suitable for various application scenarios.

[0027] Optionally, the rod connecting structure further comprises an elastic member 5, the bottom of the outer sleeve 1 is connected with a bottom cover 6, the bottom cover 6 is movably connected with the inner sleeve 2, and the upper and lower ends of the elastic member 5 abut against the inner sleeve 2 and the bottom cover 6 respectively; when the bottom cover 6 is pressed upward, the limiting cavity 11, the installation groove 21 and the limiting hole 311 are radially aligned, and the rod 3 and the inner sleeve 2 are in a detachable state; when the bottom cover 6 is released, the elastic member 5 drives the outer sleeve 1 to slide so that the limiting cavity 11 and the installation groove 21 are radially misaligned, and the inner sleeve 2 and the rod 3 are in a locked state.

[0028] As shown in the drawings, Figure 1And 2 As shown in the figure, in this embodiment, the elastic member 5 is a spring. In other embodiments, the spring can be replaced by other parts that can achieve the reset function, such as elastic sheets, rubber blocks, etc. The bottom cover 6 and the outer sleeve 1 are connected by threads, which is convenient for installation. In other embodiments, the bottom cover 6 and the outer sleeve 1 can also be integrally provided. When the bottom cover 6 is pressed, the bottom cover 6 and the outer sleeve 1 move up together and press the elastic member 5, which accumulates the backtracking force. When the bottom cover 6 is released, the elastic member 5 pushes the outer sleeve 1 and the bottom cover 6 to reset.

[0029] Optionally, the bottom cover 6 is provided with a connecting column 61, the bottom of the elastic member 5 is sleeved on the connecting column 61, and the bottom of the inner sleeve 2 is concavely provided with a connecting groove 22, and the upper end of the elastic member 5 is accommodated in the connecting groove 22.

[0030] As shown in the figure, Figure 3 In this embodiment, the cross section of the connecting column 61 is hexagonal, and the connecting column 61 is upwardly protrudingly provided from the bottom of the bottom cover 6. The bottom of the bottom cover 6 forms a hexagonal mounting hole. When the bottom cover 6 and the outer sleeve 1 are threadedly installed, a tool can be inserted into the mounting hole to tighten the bottom cover 6, so that the connection is more firm.

[0031] Optionally, the bottom of the inner sleeve 2 is provided with a flange 23, the inner sleeve 1 is provided with an abutting portion 12 that is suitable for abutting against the flange 23. When the flange 23 and the abutting portion 12 abut against each other, the limiting cavity 11 and the mounting groove 21 are radially misaligned, and the movable member 4 is simultaneously accommodated between the mounting groove 21 and the limiting hole 311.

[0032] As shown in the figure, Figure 1 and 2 In this embodiment, the abutment of the flange 23 and the abutting portion 12 can limit the downward sliding position of the outer sleeve 1, preventing the outer sleeve 1 from being separated from the inner sleeve 2 under the action of the elastic member 5 and gravity. When in the locked state, the outer side of the movable member 4 is limited by the inner wall of the outer sleeve 1 and cannot move, and the movable member 4 can only be simultaneously accommodated in the mounting groove 21 and the limiting hole 311 in the locked position.

[0033] As shown in the figure, Figures 2-4 Optionally, the movable member 4 is cylindrical, the mounting groove 21 includes a limiting portion 211 for limiting the front and back sidewalls of the movable member 4, and the mounting groove 21 is provided with an opening 212, the vertical cross-sectional diameter of the opening 212 is smaller than the vertical cross-sectional diameter of the movable member 4, so as to prevent the movable member 4 from falling out of the opening 212.

[0034] In other embodiments, the movable member 4 can also be spherical, and the shape of the mounting groove 21 can be adapted to the spherical shape.

[0035] As Figure 1 and 2 shown, optionally, a guide wall 111 is arranged on the limiting cavity 11, the guide wall 111 is arranged downwardly and outwardly from inside to outside, and the guide wall 111 is adapted to push the movable piece 4 away from the limiting cavity 11. In other embodiments, the inner wall of the limiting cavity 11 can also be in a circular arc shape, and the movable piece 4 is guided by the circular arc shape.

[0036] As Figure 1 and 2 shown, optionally, a housing 7 is further included, the housing 7 is through from top to bottom, the housing 7 includes a first accommodating cavity 71 and a second accommodating cavity 72 which are in communication with each other, the diameter of the first accommodating cavity 71 is adapted to the diameter of the rod piece 3, the outer sliding sleeve 1 and the inner sliding sleeve 2 are both accommodated in the second accommodating cavity 72, and the upper end of the inner sliding sleeve 2 abuts against the inner top wall of the second accommodating cavity 72.

[0037] Optionally, the rod piece 3 includes a first rod body 31 and a second rod body 32 which are coaxially arranged, the limiting hole 311 is arranged on the outer wall of the first rod body 31, and the cross section of the first rod body 31 is in a runway column shape, so that when the first rod body 31 is inserted into the inner sliding sleeve 2, the limiting hole 311 can be aligned with the mounting groove 21, and the second rod body 32 is convenient for holding by hand or connecting external parts.

[0038] As Figure 5 shown, in the embodiment, the first rod body 31 and the second rod body 32 are integrally formed. The cross section shape of the first accommodating cavity 71 is adapted to the first rod body 31, and preferably, the cross section of the first rod body 31 is in a runway column shape, so that the stress borne by the first rod body 31 is more uniform, and when the first rod body 31 is inserted into the inner sliding sleeve 2, the direction can be recognized to make the limiting hole 311 easily aligned with the mounting groove 21, and it is not easy to make mistakes. In other embodiments, the cross section shape of the first rod body 31 can also be rectangular, triangular, circular, etc.; and an indication mark can be added on the rod piece 3 or the housing 7, so as to facilitate the recognition of the mounting direction.

[0039] In the embodiment, the second rod body 32 is in a cylindrical shape, and in other embodiments, it can also be set in a shape convenient for holding, such as a wave shape, etc.

[0040] As Figure 5 shown, optionally, a chamfer 312 is arranged at the bottom of the first rod body 31, and the chamfer 312 is convenient for inserting the rod piece 3 into the inner sliding sleeve 2.

[0041] Optionally, the first rod body 31 has a smaller diameter than the second rod body 32, the gasket 8 and the buffer pad 9 are sleeved on the first rod body 31, the upper and lower ends of the gasket 8 abut against the second rod body 32 and the buffer pad 9 respectively, and the lower end of the buffer pad 9 abuts against the upper end of the outer shell 7.

[0042] As shown in FIGS. 1, 2 and 3, the first rod body 31 is sleeved on the second rod body 32, and the gasket 8 is sleeved on the first rod body 31. Figure 2 and 3 In the present embodiment, the gasket 8 is made of metal and is in interference fit with the first rod body 31. The bottom of the second rod body 32 abuts against the gasket 8, thereby providing an upward supporting force for the rod member 3, so as to balance the gravity transmitted to the rod member 3 by the inner sliding sleeve 2 and the outer sliding sleeve 1. In other embodiments, the gasket 8 can be integrally formed with the rod member 3, so that the bottom of the second rod body 32 directly abuts against the upper end of the outer shell 7 to provide the supporting force.

[0043] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present disclosure.

[0044] In addition, the terms "first", "second", and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0045] In the present disclosure, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0046] In the present disclosure, unless specifically defined and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can be directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature "under", "below" and "underneath" the second feature can be directly below or obliquely below the second feature, or simply indicate that the first feature is lower in level than the second feature.

[0047] It should be noted that when an element is referred to as being "fixed", "disposed", "secured" or "arranged" to another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. Further, when an element is referred to as being "fixedly connected" to another element, the two elements can be fixedly connected in a detachable manner or fixedly connected in a non-detachable manner such as by sleeving, clamping, integrally forming, welding, etc., which can be achieved in the prior art and will not be described here.

[0048] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not contradict each other, they should be considered within the scope of the present disclosure.

[0049] The above embodiments only express several implementation manners of the present disclosure, and the description is specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be noted that for those skilled in the art, without departing from the utility model concept of the present disclosure, some modifications and improvements can be made, which are within the protection scope of the present disclosure.

Claims

1. A rod connecting structure characterized by comprising: The utility model provides a locking device of a rod, which comprises an outer sliding sleeve (1), an inner sliding sleeve (2) and a rod (3), the outer sliding sleeve (1) is movably sleeved on the inner sliding sleeve (2) in up and down directions, a radially communicating mounting groove (21) is arranged on the side wall of the inner sliding sleeve (2), a movable part (4) radially movably arranged in the mounting groove (21) is arranged in the mounting groove (21), a limiting cavity (11) suitable for movably connecting with the movable part (4) is arranged in the outer sliding sleeve (1), and a limiting hole (311) suitable for movably connecting with the movable part (4) is arranged on the side wall of the rod (3).

2. The rod connecting structure according to claim 1, characterized by When the rod (3) is axially inserted into the inner sliding sleeve (2) during installation, the outer wall of the rod (3) pushes the movable part (4) to move radially, so that the movable part (4) is simultaneously accommodated in the mounting groove (21) and the limiting cavity (11), and after the limiting hole (311) is radially aligned with the mounting groove (21), the outer sliding sleeve (1) is slid along the inner sliding sleeve (2), the outer sliding sleeve (1) pushes the movable part (4) to move away from the limiting cavity (11) and is simultaneously accommodated in the mounting groove (21) and the limiting hole (311), so that the inner sliding sleeve (2) and the rod (3) are fixed.

3. The rod connection structure according to claim 2, characterized by The utility model further comprises a resilient part (5), a bottom cover (6) connected to the bottom of the outer sliding sleeve (1), the bottom cover (6) is movably connected with the inner sliding sleeve (2) in up and down directions, and the upper and lower ends of the resilient part (5) abut against the inner sliding sleeve (2) and the bottom cover (6) respectively; when the bottom cover (6) is pressed upward, the limiting cavity (11), the mounting groove (21) and the limiting hole (311) are radially aligned, and the rod (3) and the inner sliding sleeve (2) are in a detachable state; when the bottom cover (6) is released, the resilient part (5) drives the outer sliding sleeve (1) to slide so that the limiting cavity (11) and the mounting groove (21) are radially misaligned, and the inner sliding sleeve (2) and the rod (3) are in a locked state.

4. The rod connecting structure according to claim 1, characterized by A connecting column (61) is protrudingly arranged on the bottom cover (6), the bottom of the resilient part (5) is sleeved on the connecting column (61), a connecting groove (22) is recessed in the bottom of the inner sliding sleeve (2), and the upper end of the resilient part (5) is accommodated in the connecting groove (22). A flange (23) is arranged on the bottom of the inner sliding sleeve (2), a abutting part (12) suitable for abutting against the flange (23) is arranged in the outer sliding sleeve (1), when the flange (23) and the abutting part (12) abut against each other, the limiting cavity (11) and the mounting groove (21) are radially misaligned, and the movable part (4) is simultaneously accommodated between the mounting groove (21) and the limiting hole (311).

5. The rod connection structure according to claim 1, characterized by The movable element (4) is cylindrical, the mounting groove (21) comprises a limiting part (211) for limiting the front and back end sidewalls of the movable element (4), and the mounting groove (21) is provided with an opening (212), the vertical section diameter of the opening (212) is smaller than the vertical section diameter of the movable element (4), so as to prevent the movable element (4) from falling out of the opening (212).

6. The rod connection structure according to claim 1, characterized by The limiting cavity (11) is provided with a guide wall (111) inclined downward from inside to outside, which is suitable for pushing the movable element (4) away from the limiting cavity (11).

7. The rod connection structure according to claim 1, characterized by The bottom of the rod element (3) is provided with a chamfer (312), which facilitates the insertion of the rod element (3) into the inner sliding sleeve (2).

8. The rod connection structure according to any one of claims 1 to 7, characterized by Further comprising a shell (7) penetrating through up and down, the shell (7) comprises a first accommodating cavity (71) and a second accommodating cavity (72) communicating up and down, the diameter of the first accommodating cavity (71) is matched with the diameter of the rod element (3), the outer sliding sleeve (1) and the inner sliding sleeve (2) are accommodated in the second accommodating cavity (72), and the upper end of the inner sliding sleeve (2) abuts against the inner top wall of the second accommodating cavity (72).

9. The rod connection structure according to claim 8, characterized by The rod element (3) comprises a first rod body (31) and a second rod body (32) coaxially arranged, the limiting hole (311) is arranged on the outer wall of the first rod body (31), the cross section of the first rod body (31) is a runway column, so that the limiting hole (311) can be aligned with the mounting groove (21) when the first rod body (31) is inserted into the inner sliding sleeve (2), and the second rod body (32) is convenient for holding or connecting external parts.

10. The rod connection structure according to claim 9, characterized by The diameter of the first rod body (31) is smaller than that of the second rod body (32), the first rod body (31) is sleeved with a gasket (8) and a buffer pad (9), the upper and lower ends of the gasket (8) abut against the second rod body (32) and the buffer pad (9) respectively, and the lower end of the buffer pad (9) abuts against the upper end of the shell (7). The diameter of the first rod body (31) is smaller than that of the second rod body (32), the first rod body (31) is sleeved with a gasket (8) and a buffer pad (9), the upper and lower ends of the gasket (8) abut against the second rod body (32) and the buffer pad (9) respectively, and the lower end of the buffer pad (9) abuts against the upper end of the shell (7).

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