Improved ice skates

Abstract

The utility model discloses an improved ice skate which comprises a skate body and idler wheels arranged at the bottom of the skate body, the idler wheels comprise a front conversion idler wheel set and a rear conversion idler wheel set, and the front conversion idler wheel set and the rear conversion idler wheel set comprise rotating discs rotationally arranged at the bottom of the skate body. The two conversion rollers are oppositely arranged on the rotating disc, a sliding limiting piece and a rotating limiting piece are arranged on the upper surface of the rotating disc, and the sliding limiting piece slides back and forth to promote the rotating limiting piece to rotate back and forth; the rotary limiting piece achieves the unlocking rotating state and the closing locking state of the two oppositely-arranged conversion rollers, a switch piece is arranged on the lower surface of the rotary disc, and the switch piece and the sliding limiting piece are fixedly connected together through a locking piece. According to the utility model, the design is reasonable, the operation of young beginners can be switched back and forth, and the operation requirements of users are greatly met.

Description

Technical Field

[0001] This utility model relates to the field of roller skate technology, and in particular to an improved roller skate. Background Technology

[0002] Existing roller skates, because all the wheels on the sole rotate freely in both directions, require the user to alternately push off with both feet backward and outward to propel themselves forward. While this method of controlling the skates achieves the desired movement, a Chinese utility model patent (CN215841527U) discloses a convertible single / double row roller skate. In this design, two horizontally arranged convertible rollers rotate 180 degrees to a vertical alignment via a locking device. However, this locking device requires lifting the locking tongue, which makes operation difficult, especially for younger beginners. Therefore, improvements to the existing technology are necessary. Utility Model Content

[0003] (a) Technical problems that need to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides an improved roller skate with a reasonable design that is more conducive to the operation and switching between different modes for younger beginners, greatly facilitating the user's operational needs.

[0005] (ii) Technical solutions to be adopted

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An improved roller skate includes a shoe body and rollers disposed at the bottom of the shoe body. The rollers include a front conversion roller group and a rear conversion roller group. The front conversion roller group and the rear conversion roller group include a turntable rotatably disposed at the bottom of the shoe body, and two opposing conversion rollers disposed on the turntable. The upper surface of the turntable is provided with a sliding limiter and a rotation limiter. The back-and-forth sliding of the sliding limiter causes the rotation limiter to rotate back and forth. The rotation limiter enables the two opposing conversion rollers to be unlocked and locked. The lower surface of the turntable is provided with a switch, and the switch is fixedly connected to the sliding limiter by a locking member.

[0008] Preferably, the sliding limiting member includes a sliding block that slides back and forth on the turntable, the sliding block is provided with a pair of protrusions, and a return member is provided between the sliding block and the turntable.

[0009] Preferably, the turntable has a notch, and the sliding block has a protrusion that can move in and out of the notch.

[0010] Preferably, the return element is a spring.

[0011] Preferably, the bumps distributed in pairs are symmetrically distributed.

[0012] Preferably, the rotation limiting component includes a pair of rotation limiting blocks disposed on the turntable. One end of each pair of rotation limiting blocks is connected by a rotation shaft, and the pairs of rotation limiting blocks are connected by a spring-loaded component. The other end of each pair of rotation limiting blocks engages with a corresponding pair of protrusions.

[0013] Preferably, one end of the rotating limiting block that contacts the protrusion is provided with a mating surface and a groove, and the back of the groove is provided with a convex surface, which mates with the conversion roller.

[0014] Preferably, the spring-loaded component is a tension spring.

[0015] Preferably, the conversion roller includes a positioning block that can rotate clockwise and counterclockwise on the turntable and a wheel frame that is inserted into the positioning block from the lower surface of the turntable. The wheel frame is connected to a wheel via a rotating shaft. The positioning block has two slots and one limiting groove on its circumference. The upper surface of the turntable has a limiting block that cooperates with the limiting groove.

[0016] Preferably, the switching element includes a switch that slides back and forth on the lower surface of the turntable, a guide block is provided on the switch, and a limit hole is provided on the turntable.

[0017] Preferably, the sliding limit member extends from the lower surface of the guide block into the sliding limit member to fix the switch member and the sliding limit member together.

[0018] Preferably, the turntable includes a disc body and a collar fitted on the disc body. A limiting block is provided on the upper surface of the disc body, and a rotating groove for rotating the disc body is provided on the lower surface of the bottom of the shoe body. A limiting groove that cooperates with the limiting block is provided on the inner sidewall of the rotating groove.

[0019] Preferably, two limiting grooves are used, and the two limiting grooves are arranged at a 90-degree angle.

[0020] Preferably, the collar is provided with a pair of lugs for fixing to the lower surface of the bottom of the shoe body, and each lug is fixed and locked to the lower surface of the bottom of the shoe body by a fastener.

[0021] (III) The technical effects to be achieved

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] Firstly, the front and rear conversion roller assemblies of this utility model include a turntable rotatably mounted on the bottom of the shoe body, and two opposing conversion rollers mounted on the turntable. The upper surface of the turntable is provided with a sliding limiter and a rotation limiter. The back-and-forth sliding of the sliding limiter causes the rotation limiter to rotate back and forth. The rotation limiter enables the two opposing conversion rollers to be unlocked and locked. Furthermore, a switch is provided on the lower surface of the turntable, and the switch is fixedly connected to the sliding limiter by a locking mechanism. This design is reasonable, easy to manufacture and install, and only requires pressing the switch during use, making it more suitable for younger beginners to operate and switch back and forth, greatly facilitating user operation.

[0024] Secondly, the front and rear conversion roller assemblies of this utility model include a turntable rotatably mounted on the bottom of the shoe body, and two opposing conversion rollers mounted on the turntable. The upper surface of the turntable is provided with a sliding limiter and a rotation limiter. The back-and-forth sliding of the sliding limiter causes the rotation limiter to rotate back and forth. The rotation limiter enables the two opposing conversion rollers to be unlocked and locked. The lower surface of the turntable is provided with a switch, which is fixedly connected to the sliding limiter by a locking member. The locking of the conversion rollers is more secure and safer, which helps to improve the safety of use and better meet the user's needs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model.

[0026] Figure 2 This is a three-dimensional schematic diagram of the present invention.

[0027] Figure 3 This is a front view of the present utility model.

[0028] Figure 4 for Figure 3 Sectional view along the AA direction.

[0029] Figure 5 This is an exploded view of the present invention.

[0030] Figure 6 This is an exploded view of the shoe body and the front conversion roller assembly of this utility model.

[0031] Figure 7 This is a schematic diagram showing the installation of the sliding limiter and the rotation limiter on the turntable of this utility model.

[0032] Figure 8This is a schematic diagram showing the cooperation between the sliding limiter and the rotating limiter of this utility model.

[0033] Figure 9 This is a schematic diagram showing the installation of the sliding limiter, rotating limiter, and switch of this utility model.

[0034] Figure 10 This is a schematic diagram of the sliding block of this utility model.

[0035] Figure 11 This is a schematic diagram of the sliding block structure of this utility model.

[0036] Figure 12 This is a schematic diagram of the rotating limiting block structure of this utility model.

[0037] Figure 13 This is a schematic diagram of the overall positioning block of this utility model.

[0038] Figure 14 This is a schematic diagram of the positioning block structure of this utility model.

[0039] Figure 15 This is a schematic diagram showing the installation of the turntable, conversion roller, and switch components of this utility model.

[0040] Figure 16 This is a schematic diagram of the adjustment device structure in the shoe body of this utility model.

[0041] In the diagram: 1, shoe body; 2, roller; 11, sole; 12, upper; 13, adjustment device; 21, front conversion roller assembly; 22, rear conversion roller assembly; 131, adjustment rod; 132, adjustment block; 211, turntable; 212, conversion roller; 213, sliding limit component; 214, rotation limit component; 215, switch component; 2111, disc body; 2112, collar; 2113, limiting block; 2121, positioning. 2122, wheel frame; 2123, rotating shaft; 2124, wheel; 2125, slot; 2126, limiting groove; 2127, limiting block; 2131, sliding block; 2132, protrusion; 2133, return component; 2134, protrusion; 2141, rotating limiting block; 2142, rotating shaft; 2143, springback component; 21411, mating surface; 21412, groove; 21413, convex surface. Detailed Implementation

[0042] In the description of this utility model, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0043] In the description of this utility model, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0044] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0046] Example 1: See Figures 1 to 9An improved roller skate includes a shoe body 1 and rollers 2 disposed at the bottom of the shoe body 1. The rollers 2 include a front conversion roller assembly 21 and a rear conversion roller assembly 22, both of which are used for single / double row conversion, and the front and rear conversion roller assemblies 21 and 22 have identical structures. The improved roller skate is characterized in that: the front and rear conversion roller assemblies 21 and 22 include a turntable 211 rotatably disposed at the bottom of the shoe body 1, and two opposing conversion rollers 212 disposed on the turntable 211. A sliding limiter 2 is provided on the upper surface of the turntable 211. 13 and a rotating limiting member 214, the back-and-forth sliding of the sliding limiting member 213 causes the rotating limiting member 214 to rotate back and forth, the rotating limiting member 214 realizes the unlockable rotation state and the lockable state of the two oppositely arranged conversion rollers 212, and a switch member 215 is provided on the lower surface of the turntable 211, the switch member 215 and the sliding limiting member 213 are fixedly connected together by a locking member, by pressing the switch member 215, the sliding limiting member 213 will slide together with the switch member 215, and then the sliding limiting member 213 will cause the rotating limiting member 214 to disengage. The locking mechanism secures two opposing conversion rollers 212. These rollers can rotate 90 degrees back and forth, allowing for either a 90-degree rotation between two horizontally arranged rollers to form a vertical arrangement, or a 90-degree rotation between two vertically arranged rollers to form a horizontal arrangement, or any one of the horizontally arranged (or vertically arranged) rollers 212 to rotate 90 degrees. When the pressing force is released, the sliding limit member 213 returns to its original position along with the switch member 215. Then, the sliding limit member 213 causes the rotation limit member 214 to lock the two horizontally arranged rollers... The conversion roller 212 (or two vertically arranged conversion rollers 212, or one vertically arranged conversion roller 242 and the other horizontally arranged conversion roller 242) is locked, so that the conversion roller 212 cannot be easily rotated unless it is damaged, which greatly improves the safety of use. It can be seen that this structure is more reasonable, easy to manufacture and assemble, and extremely simple and convenient to operate. It only requires pressing, which is more conducive to young beginners to operate and switch back and forth, greatly facilitating the user's operation needs.

[0047] Example 2: Based on Example 1, such as... Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11As shown, the sliding limiting member 213 includes a sliding block 2131 that slides back and forth on the turntable 211. The sliding block 2131 has paired protrusions 2132. A return member 2133 is provided between the sliding block 2131 and the turntable 211, which facilitates the automatic return of the sliding block 2131. Further, the turntable 211 has a notch, and the sliding block 2131 has a protrusion 2134 that can move in and out of the notch, thus limiting the back-and-forth sliding of the sliding block 2131. Even further, the return member 2133 is a spring, which is widely available and easy to implement. The sliding block 2131, protrusions 2132, and protrusions 2134 are integrally formed, greatly improving the structural robustness. In this embodiment, the paired protrusions 2132 are symmetrically distributed, which is not only beneficial to manufacturing, but also more conducive to the rotation of the rotation limiter 214.

[0048] like Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12As shown, the rotating limiting member 214 includes pairs of rotating limiting blocks 2141 disposed on the turntable 211. One end of each pair of rotating limiting blocks 2141 is connected by a rotating shaft 2142, and the pairs of rotating limiting blocks 2141 are connected by a spring-loaded member 2143. The other end of each pair of rotating limiting blocks 2141 engages with a corresponding pair of protrusions 2132. After the paired protrusions 2132 slide along with the sliding block 2131, the paired rotating limiting blocks 2141 lose the force that would otherwise have forced them apart. Then, under the action of the spring-loaded member 2143, the paired protrusions 2141... The rotating limiting blocks 2141 rotate towards each other with the rotating shaft 2142 as the fulcrum. At this time, the paired rotating limiting blocks 2141 will lose the corresponding locking state of the conversion roller 212. Then the conversion roller 212 can rotate 90 degrees clockwise and counterclockwise. When the protrusion 2132 returns to the initial position with the sliding block 2131, the protrusion 2132 will push against the rotating limiting blocks 2141. The paired rotating limiting blocks 2141 rotate in the opposite direction with the rotating shaft 2142 as the fulcrum. The rotating limiting blocks 2141 will lock the conversion roller 212. At this time, the conversion roller 212 can be firmly locked, which is beneficial to adjusting the direction of the conversion roller 212.To further explain, one end of the rotating limiting block 2141 that contacts the protrusion 2132 is provided with a mating surface 21411 (which is a curved or inclined surface to facilitate better sliding with the protrusion 2132) and a groove 21412. The back of the groove 21412 is provided with a convex surface 21413, which is locked with the conversion roller 212. When the protrusion 213 is in contact with the mating surface 21411, Each of the protrusions 2132 will abut against the mating surface 21411 of the corresponding rotation limiting block 2141, that is, the paired rotation limiting blocks 2141 will firmly lock the corresponding conversion roller 212. When the protrusion 2132 slides from the mating surface 21411 of the rotation limiting block 2141 into the groove 21412, the protrusion 2132 loses its abutting force against the rotation limiting block 2141. Under the action of the spring-loaded component 2143, the paired rotating limiting blocks 2141 rotate towards each other around the rotating shaft 2142. At this time, the paired rotating limiting blocks 2141 will lose the corresponding locking state of the conversion roller 212, and then the conversion roller 212 can rotate 90 degrees clockwise and counterclockwise. When the protrusion 2132 slides from the groove 21412 at one end of the rotating limiting block 2141 to the mating surface 21411, each of the protrusions... The corresponding rotation limiting block 2141 rotates in the opposite direction until the protrusion 2132 contacts and abuts against the mating surface 21411 at one end of the rotation limiting block 2141. The paired rotation limiting blocks 2141 rotate in opposite directions around the rotation axis 2142, and the rotation limiting blocks 2141 will then lock the conversion roller 212. At this time, the conversion roller 212 can be firmly locked, which is beneficial for adjusting the direction of the conversion roller 212. In this embodiment, the spring element 2143 is a tension spring. This setting is simple and easy to implement. The tension spring is beneficial for realizing the opposite rotation of the paired rotation limiting blocks 2141.

[0049] like Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 13 and Figure 14As shown, the conversion roller 212 includes a positioning block 2121 that can rotate clockwise and counterclockwise on the turntable 211, and a wheel frame 2122 that is inserted into the positioning block 2121 from the lower surface of the turntable 211. The wheel frame 2122 is connected to a wheel 2124 via a rotating shaft 2123. The positioning block 2121 has two slots 2125 and one limiting groove 2126 on its circumference. The upper surface of the turntable 211 has a limiting block 2127 that cooperates with the limiting groove 2126. The setting of 27 helps to reduce the service life reduction and instability caused by wear, and is more conducive to meeting the use requirements. The convex surface 21413 on the back of the mating surface 2141 of one end of the rotating limiting block 2141 is locked into either of the two slots 2125 to lock the conversion roller 212. The limiting block 2127 rotates back and forth in the limiting groove 2126, thereby realizing the rotation angle of the positioning block 2121. In this embodiment, the positioning block 2121 can rotate 90 degrees clockwise and counterclockwise, which is beneficial to realize the horizontal and vertical directions.

[0050] Example 3: This can be described based on Example 1 or Example 2, such as... Figure 6 , Figure 9 and Figure 15 As shown, the switch 215 includes a switch that slides back and forth on the lower surface of the turntable 211. A guide block is provided on the switch, and a limiting hole is provided on the turntable 211. The guide block moves back and forth within the limiting hole to achieve the sliding distance of the switch. Further, a sliding limiting member 213 extends from the lower surface of the guide block and is inserted into the sliding limiting member 213 to fix the switch 215 and the sliding limiting member 213 together. Pressing the switch causes the sliding limiting member 213 to move along with the switch; when the pressure on the switch is released, the switch returns to its original position along with the sliding limiting member 213, which is convenient for user operation.

[0051] Example 4: This can be described based on Example 1, Example 2, or Example 3, such as... Figure 5 , Figure 6 , Figure 7 and Figure 15As shown, the turntable 211 includes a disc body 2111 and a collar 2112 fitted onto the disc body 2111. A limiting block 2113 is provided on the upper surface of the disc body 2111, and a rotating groove for rotating the disc body 2111 is provided on the lower surface of the shoe body 1. A limiting groove that cooperates with the limiting block 2113 is provided on the inner wall of the rotating groove. In this embodiment, two limiting grooves are used, arranged at a 90-degree angle, which facilitates the disc body 2111 rotating 90 degrees clockwise and counterclockwise. Further, the collar 2112 is provided with paired lugs for fixing to the lower surface of the shoe body 1. Each lug is fixed and locked to the lower surface of the shoe body 1 by a fastener, such as a screw or bolt, for ease of implementation.

[0052] Example 5: This can be described based on Example 1, Example 2, Example 3, or Example 4, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and 16 As shown, a brake block (not shown in the figure) is provided at the bottom of the shoe body 1, and a brake pad (not shown in the figure) is provided at the bottom end of the brake block, which improves the safety of use. This structure is similar to the prior art and will not be described in detail here.

[0053] Example 6: This can be described based on Example 1, Example 2, Example 3, Example 4, or Example 5, such as... Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and 16 As shown, the shoe body 1 includes a sole 11 and an upper 12 disposed on the sole 11. An adjustment device 13 is provided between the sole 11 and the upper 12. The adjustment device 13 includes an adjustment rod 131 passing through the sole 11 and extending to the lower end face of the upper 12. An adjustment block 132 (size adjustment block) is provided on the upper 12. Specifically, the front end of the adjustment rod 131 is a lead screw, and a threaded groove is provided on the lower surface of the adjustment block 132. The lead screw engages at different positions in the threaded groove to adjust the size of the roller skate. The roller skate size can be adjusted by rotating the adjustment rod 131 without removing the skates. The adjustment method is simple, easy, versatile, and convenient to use.

[0054] In this utility model, the front conversion roller group 21 and the rear conversion roller group 22 have the same structure, so the structure of the rear conversion roller group 22 is not described again.

[0055] All standard parts used in this application can be purchased from the market, and the specific connection methods of each part adopt conventional methods such as bolts and rivets that are mature in the existing technology, which will not be described in detail here.

[0056] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection for this utility model. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this utility model, or equivalent structural or procedural transformations made using the content of this utility model's specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of protection of this utility model patent.

Claims

1. An improved roller skate, comprising a shoe body (1) and rollers (2) disposed at the bottom of the shoe body (1), the rollers (2) comprising a front conversion roller assembly (21) and a rear conversion roller assembly (22), characterized in that: The front conversion roller assembly (21) and the rear conversion roller assembly (22) include a turntable (211) rotatably mounted on the bottom of the shoe body (1), and two opposing conversion rollers (212) mounted on the turntable (211). The upper surface of the turntable (211) is provided with a sliding limit member (213) and a rotation limit member (214). The back-and-forth sliding of the sliding limit member (213) causes the rotation limit member (214) to rotate back and forth. The rotation limit member (214) enables the two opposing conversion rollers (212) to be unlocked and locked. The lower surface of the turntable (211) is provided with a switch member (215). The switch member (215) and the sliding limit member (213) are fixedly connected together by a locking member.

2. The improved roller skates as described in claim 1, characterized in that: The sliding limiter (213) includes a sliding block (2131) that slides back and forth on the turntable (211), the sliding block (2131) is provided with a pair of protrusions (2132), and a return member (2133) is provided between the sliding block (2131) and the turntable (211).

3. The improved roller skates as described in claim 2, characterized in that: The turntable (211) has a notch, and the sliding block (2131) has a protrusion (2134) that can move in and out of the notch.

4. The improved roller skates as described in claim 2 or 3, characterized in that: The bumps (2132) are symmetrically distributed in pairs.

5. The improved roller skates as described in claim 2 or 3, characterized in that: The rotating limiting member (214) includes a pair of rotating limiting blocks (2141) disposed on the turntable (211). One end of each pair of rotating limiting blocks (2141) is connected by a rotating shaft (2142), and the pair of rotating limiting blocks (2141) are connected by a spring-loaded member (2143). The other end of each pair of rotating limiting blocks (2141) is engaged with a corresponding pair of protrusions (2132).

6. The improved roller skate as described in claim 5, characterized in that: The rotating limiting block (2141) that contacts the protrusion (2132) has a mating surface (21411) and a groove (21412) on one end, and the back of the groove (21412) is a convex surface (21413), which is in contact with the conversion roller (212).

7. The improved roller skate as described in claim 5, characterized in that: The conversion roller (212) includes a positioning block (2121) that can rotate clockwise and counterclockwise on the turntable (211) and a wheel frame (2122) that is inserted into the positioning block (2121) from the lower surface of the turntable (211). The wheel frame (2122) is connected to a wheel (2124) via a rotating shaft (2123). The positioning block (2121) has two slots (2125) and one limiting groove (2126) on its circumference. The upper surface of the turntable (211) has a limiting block (2127) that cooperates with the limiting groove (2126).

8. The improved roller skates as described in claim 1, 2, 3, 6, or 7, characterized in that: The switch (215) includes a switch that slides back and forth on the lower surface of the turntable (211), a guide block is provided on the switch, and a limit hole is provided on the turntable (211).

9. The improved roller skate as described in claim 8, characterized in that: The sliding limit member (213) extends from the lower surface of the guide block into the sliding limit member (213) to fix the switch member (215) and the sliding limit member (213) together.

10. The improved roller skates as described in claim 1, 2, 3, 6, 7, or 9, characterized in that: The turntable (211) includes a disc body (2111) and a collar (2112) fitted on the disc body (2111). A limiting block (2113) is provided on the upper surface of the disc body (2111), and a rotating groove for rotating the disc body (2111) is provided on the lower surface of the bottom of the shoe body (1). A limiting groove that cooperates with the limiting block (2113) is provided on the inner side wall of the rotating groove.

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