Tennis racket cord tightening device

Abstract

The utility model provides a tennis racket cord thread tightening device which comprises a bearing table and a clamping piece, a strip-shaped groove is formed in the bearing table, and the clamping piece comprises a screw arranged in the strip-shaped groove in a guiding and sliding mode, a swing arm arranged on the screw in a sleeved mode and a locking nut connected to the upper end of the screw in a threaded mode. Strip-shaped pieces are arranged on the portions, located on the two sides of the strip-shaped groove, of the upper surface of the bearing table, each strip-shaped piece comprises a first friction face matched with the swing arm in a contact mode, a plurality of protruding parts are evenly arranged on the face, close to the swing arm, of the locking nut at intervals around the screw rod, and when the locking nut locks the swing arm, the first friction faces are matched with the first friction faces in a contact mode. The friction force between the multiple protruding parts and the swing arm is smaller than the friction force between the first friction face and the swing arm.

Description

Technical Field

[0001] The utility model generally relates to the technical field of cord tightening devices, and in particular to a cord tightening device for a tennis racket. Background Art

[0002] A tennis racket includes a racket frame and cords inserted into the racket frame. The racket frame is provided with a plurality of through holes for the cords to pass through, and the cords are inserted into the through holes. When the cords are inserted into the tennis racket, the cords need to be tensioned using a special tensioner so that the cords have a certain poundage. When stringing the racket, the racket needs to be fixed using a bracket, and then the cords are inserted into the through holes of the racket frame, and then the cords are tensioned using a tensioner. The racket bracket is also provided with two clamps for supporting the cords. After the cord tension reaches a certain poundage, a clamp is used to clamp the tensioned cord, and then the end of the cord is passed through the next through hole, and then the tensioner is used to tension the cord. After tensioning, the next clamp is used to clamp the cord, and tension is applied to each section of the cord one by one through the cooperation of the two clamps.

[0003] When the cord is threaded section by section, the clamping member needs to move along the contour of the racket frame, so the clamping member is slidably set on the bearing platform of the bracket. Since the racket frame includes an arc-shaped segment, in order to make the clamping member adapt to the contour of the racket frame, the clamping member in the prior art includes a swing arm slidably set on the bearing and a clip set at one end of the swing arm, the other end of the swing arm is slidably matched with the bearing platform, and a locking member is provided between the swing arm and the bearing platform. After the clamping member slides to a suitable position, the locking member is used to lock the swing arm. At this time, the swing arm and the bearing platform are locked, and the swing arm cannot swing. At this time, it is fixed by the clip, so that the cord can be fixed by clamping the cord by the clip.

[0004] However, the current connection method between the swing arm and the supporting platform is: a strip groove is provided on the supporting platform, a screw is slidably penetrated in the strip groove, a through hole is provided at the other end of the swing arm for the empty screw to pass through and rotate to cooperate, the upper end of the screw is threadedly connected with a locking nut, and the lower end of the screw is provided with an end cap. When in use, when adjusting the position of the clamp, first manually loosen the locking nut, then slide the swing arm and rotate the swing arm around the screw to adjust the clamp to the position that needs to be clamped, and then the user manually tightens the locking nut to achieve locking of the swing arm. At this time, the swing arm is locked and fixed. In actual use, since the locking nut and the swing arm are in surface contact, when the locking nut is loosened and locked on the swing arm, the swing arm will be driven to deviate by a certain angle, thereby causing a certain deviation in the position of the clamp, which will cause the clamp to fail to accurately clamp the cord. At this time, the locking nut must be loosened and the position of the clamp must be adjusted again, thereby affecting the efficiency of cord threading. Utility Model Content

[0005] In view of the above problems, the present application provides a tennis racket cord tightening device to at least partially solve the technical problems existing in the prior art.

[0006] The utility model provides a tennis racket cord tightening device, including a bearing platform and a clamping member, wherein a strip groove is arranged on the bearing platform, and the clamping member comprises a screw rod which is slideably arranged in the strip groove, a swing arm which is sleeved on the screw rod, and a locking nut which is threadedly connected to the upper end of the screw rod, and strip members are arranged on both sides of the strip groove on the upper surface of the bearing platform, and the strip member comprises a first friction surface which contacts and cooperates with the swing arm, and a plurality of protrusions are evenly spaced around the screw rod on a surface of the locking nut close to the swing arm, and when the locking nut locks the swing arm, the friction force between the plurality of protrusions and the swing arm is smaller than the friction force between the first friction surface and the swing arm.

[0007] Specifically, through this arrangement, when the swing arm is locked by the locking nut, the protrusion first contacts the upper surface of the swing arm and applies pressing pressure, and the swing arm is pressed against the first friction surface. At this time, the pressing pressure of the protrusion on the swing arm is consistent with the supporting force of the first friction surface on the swing arm. Since the friction force between the protrusion and the swing arm is smaller than the friction force between the first friction surface and the swing arm, the friction force between the first friction surface and the swing arm can be used to limit the swing arm in the process of locking the swing arm, thereby reducing the probability of the swing arm swinging due to the rotation of the locking nut.

[0008] Furthermore, mounting grooves are provided on both sides of the strip groove, the strip member is provided in the mounting groove, the strip member is an elastic member, and when the strip member is in a free state without pressure, the first friction surface protrudes from the upper surface of the supporting platform.

[0009] Specifically, by setting the strip as an elastic member and setting the first friction surface to protrude from the upper surface of the carrier, the first friction surface can fully contact the swing arm to provide friction, and the elastic setting can reduce the damage of the strip to the swing arm when locking.

[0010] Furthermore, a guide groove is axially arranged on the end surface of the locking nut close to the swing arm and corresponds to the multiple protrusions one by one. The protrusions are guided in the guide grooves, a compression spring is arranged between the bottom of the guide groove and the protrusions, and a limiting portion for limiting the protrusions is arranged at the lower end of the guide groove. Specifically, the protrusion is configured to shrink elastically through this setting. When the swing arm is initially locked, the protrusion protrudes from the lower surface of the locking nut. At this time, only the end of the protrusion contacts the swing arm, and the friction between the protrusion and the swing arm is less than the friction between the first friction surface and the swing arm, thereby preventing the swing arm from rotating with the locking nut. When the applied locking force is large enough, the compression spring is compressed and the protrusion is switched to a contracted state. At this time, the lower surface of the locking nut contacts the swing arm, and the swing arm can be better tightened through the lower surface of the locking nut, and the friction between the first friction surface and the swing arm can better limit the circumferential rotation of the swing arm, and the contraction setting of the protrusion can be buffered by the compression spring to avoid excessive local pressure between the protrusion and the swing arm and damage the protrusion or the swing arm.

[0011] Furthermore, a plurality of threaded blind holes are arranged on the lower end surface of the locking nut corresponding to the plurality of protrusions one by one, a columnar member is threadedly connected to the inner surface of the threaded blind hole, and the guide groove is arranged in the columnar member.

[0012] Specifically, through this arrangement, the protrusion and the columnar member can be integrated into one component, thereby facilitating the disassembly and installation of the protrusion and the locking nut.

[0013] Furthermore, the screw comprises a first section that non-rotatably cooperates with the strip groove, a second section that rotates with the swing arm, and a threaded section. Specifically, by setting the first end, relative rotation between the screw and the strip groove can be avoided, making it easier for the locking nut to lock the swing arm.

[0014] Furthermore, a rigid rod is arranged at one end of the swing arm away from the screw rod, a rigid sleeve is arranged on the outer sliding sleeve of the rigid rod, a clamp is arranged at the end of the rigid sleeve, and the rigid rod is arranged parallel to the screw rod.

[0015] Furthermore, the strip-shaped groove is an arc-shaped structure.

[0016] Beneficial Effects

[0017] The utility model provides a tennis racket cord tightening device, comprising a bearing platform and a clamping piece, wherein the bearing platform is provided with a strip groove, the clamping piece comprises a screw rod which is slideably arranged in the strip groove, a swing arm which is sleeved on the screw rod and a locking nut which is threadedly connected to the upper end of the screw rod, strip pieces are arranged on both sides of the strip groove on the upper surface of the bearing platform, the strip piece comprises a first friction surface which contacts and cooperates with the swing arm, a surface of the locking nut close to the swing arm is provided with a plurality of protrusions which are evenly spaced around the screw rod, and when the locking nut is locked to the swing arm, the plurality of protrusions are The friction force between the protrusion and the swing arm is smaller than the friction force between the first friction surface and the swing arm. With this arrangement, when the swing arm is locked by means of the locking nut, the protrusion first contacts the upper surface of the swing arm and applies pressing force, and the swing arm is pressed against the first friction surface. At this time, the pressing force of the protrusion on the swing arm is consistent with the supporting force of the first friction surface on the swing arm. Since the friction force between the protrusion and the swing arm is smaller than the friction force between the first friction surface and the swing arm, the friction force between the first friction surface and the swing arm can be used to limit the swing arm in the process of locking the swing arm, thereby reducing the probability of the swing arm swinging due to the rotation of the locking nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings.

[0019] Figure 1 The utility model is a schematic diagram of the top view of the structure of a tennis racket cord tightening device.

[0020] Figure 2 The utility model is a partially enlarged structural schematic diagram of a clamping member and a bearing platform in a tennis racket cord tightening device provided by the utility model.

[0021] Figure 3 The utility model provides a schematic structural diagram of a screw rod in a tennis racket cord tightening device.

[0022] Figure 4 The utility model provides a structural schematic diagram of a locking nut in a tennis racket cord tightening device.

[0023] Figure 5 for Figure 4 The utility model is a schematic diagram of a partially enlarged structure of a position A when a raised portion of a tennis racket cord tightening device is in an extended state.

[0024] Figure 6 for Figure 4 The utility model is a schematic diagram of a partially enlarged structure of a point A in a tennis racket cord tightening device when the raised portion is in a contracted state. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] The utility model provides a tennis racket cord tightening device as a specific implementation method, referring to Figure 1-Figure 6 , including a bearing platform 1 and a clamping member 2, the bearing platform 1 is provided with a strip groove 10, the clamping member 2 includes a screw rod 21 which is slidingly arranged in the strip groove 10, a swing arm 22 which is sleeved on the screw rod 21 and a locking nut 23 which is threadedly connected to the upper end of the screw rod 21, and strip members 24 are arranged on both sides of the strip groove 10 on the upper surface of the bearing platform, the strip member 24 includes a first friction surface 241 which contacts and cooperates with the swing arm 22, and a plurality of protrusions 231 are evenly spaced around the screw rod on a surface of the locking nut 23 close to the swing arm, and when the locking nut locks the swing arm, the friction force between the plurality of protrusions 231 and the swing arm is less than the friction force between the first friction surface and the swing arm.

[0028] Specifically, it should be noted that reference Figure 1 A bracket 3 is provided on the support platform 1, and the racket frame 9 is clamped and fixed by the bracket 3. In the prior art, the structure of the bracket 3 is as follows: Figure 1 As shown, it includes a pivot 31, a clamping rod 32 and a clamping end 33 arranged on the bearing platform. The two clamping rods 32 are rotatably connected to the pivot 31, and the angle between the two clamping rods 32 can be adjusted steplessly, so that it can cope with rackets 9 of different specifications. The clamping end 33 clamps and fixes the racket frame 9, wherein a tensioner (not shown in the figure) is arranged on one side of the support platform, and the tensioner can tension the cord with a certain tension. Through this arrangement, when the swing arm 22 is locked by the locking nut, the fixing component first applies a pressing force to the upper surface of the swing arm through the protrusion 231, and presses the swing arm on the first friction surface 241. At this time, the pressing force of the protrusion on the swing arm is consistent with the supporting force of the first friction surface on the swing arm. Since the friction force between the protrusion and the swing arm is less than the friction force between the first friction surface and the swing arm, the friction force between the first friction surface and the swing arm can limit the swing arm in the process of locking the swing arm, which can reduce the probability of the swing arm swinging due to the rotation of the locking nut.

[0029] Further, as a specific implementation method, refer to Figure 1 , Figure 2 , mounting grooves 11 are provided on both sides of the strip groove 10, the strip member 24 is provided in the mounting groove 11, the strip member 24 is an elastic member, and when the strip member 24 is in a free state without being subjected to pressure, the first friction surface 241 protrudes from the upper surface of the supporting platform 1.

[0030] Specifically, by setting the strip piece 24 as an elastic piece and setting the first friction surface 241 to protrude from the upper surface of the carrier, the first friction surface can fully contact the swing arm to provide friction, and the elastic setting can reduce the damage of the strip piece to the swing arm when locking. As a specific implementation, the strip piece 241 can be made of rubber material, and the raised part can be made of steel.

[0031] Further, as a specific implementation method, refer to Figure 4 A guide groove 232 corresponding to the plurality of protrusions 231 is axially arranged on the end surface of the locking nut 23 close to the swing arm, and the protrusions 231 are guided in the guide groove 232. A compression spring 233 is arranged between the bottom of the guide groove and the protrusions, and a limiting portion 234 for limiting the protrusions 231 is arranged at the lower end of the guide groove. Specifically, the protrusion is configured to be elastically contracted through this setting. When the swing arm is initially locked, the protrusion protrudes from the lower surface 23-0 of the locking nut. At this time, only the end of the protrusion is in contact with the swing arm, and the friction between the protrusion and the swing arm is less than the friction between the first friction surface and the swing arm, thereby preventing the swing arm from rotating with the locking nut. When the applied locking force is large enough, the compression spring is compressed and the protrusion is switched to a contracted state. At this time, the lower surface 23-0 of the locking nut contacts the swing arm, and the swing arm can be better compressed through the lower surface of the locking nut, and the friction between the first friction surface and the swing arm can better limit the circumferential rotation of the swing arm, and the contraction setting of the protrusion can be buffered by the compression spring to avoid excessive local pressure between the protrusion and the swing arm and damage the protrusion or the swing arm.

[0032] Further, as a specific implementation method, refer to Figure 5 , Figure 6 A plurality of threaded blind holes 230 are arranged on the lower end surface of the locking nut 23 corresponding to the plurality of the protrusions, and a columnar member 231a is threadedly connected to the inner surface of the threaded blind hole 230, and the guide groove 232 is arranged in the columnar member 231a.

[0033] Specifically, as a specific implementation, the columnar member 231a can be made of steel, and the lower end of the columnar member is evenly spaced around the axis with a plurality of elastic arms 2341, wherein the limiting portion 234 is a protrusion arranged at the lower end of the elastic arm, and the protrusion 231 is connected to a guide member 231-1 that cooperates with the guide groove 232 for guiding. When the protrusion is installed in the guide groove, the compression spring is first arranged in the guide groove, and then a pressure is applied to the protrusion in the direction of the inside of the guide groove, and the guide member provides an outward expansion thrust to the protrusion at the lower end of the elastic arm, thereby causing a phase change in the elastic arm, so that the guide member 231-1 can enter the inside of the guide groove 232, and then the elastic arm returns to its original position under the action of the elastic force, and the protrusion at the lower end of the elastic arm limits the guide member. Through this arrangement, the protrusion and the columnar member 231a can be integrated into one component, thereby facilitating the disassembly and installation of the protrusion and the locking nut.

[0034] Further, as a preferred embodiment, the screw rod 21 includes a first section 210 non-rotatably matched with the strip groove 10, a second section 211 rotationally matched with the swing arm 22, and a threaded section 212. Specifically, by providing the first end 210, relative rotation between the screw rod 21 and the strip groove can be avoided, so that the locking nut can be used to lock the swing arm.

[0035] Further, as a specific implementation, a rigid rod 213 is provided at one end of the swing arm 22 away from the screw rod 21, a rigid sleeve 214 is provided on the outer periphery of the rigid rod 213, a clamp 215 is provided at the end of the rigid sleeve 214, and the rigid rod 213 is arranged parallel to the screw rod 21. This arrangement enables the position of the clamp to be adjusted in the vertical direction.

[0036] Further, as a specific implementation, the strip groove 10 is an arc-shaped structure. Through this arrangement, it can be adapted to the arc-shaped structure of the racket frame and is more convenient to use.

[0037] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A tennis racket cord tightening device, comprising a support platform (1) and a clamping member (2), wherein the support platform (1) is provided with a strip groove (10), the clamping member (2) comprises a screw rod (21) which is guide-slidably arranged in the strip groove (10), a swing arm (22) which is sleeved on the screw rod (21), and a locking nut (23) which is threadedly connected to the upper end of the screw rod (21), characterized in that: Strip pieces (24) are arranged on both sides of the strip groove (10) on the upper surface of the support platform, and the strip piece (24) includes a first friction surface (241) that contacts and cooperates with the swing arm (22). A plurality of protrusions (231) are evenly spaced around the screw on a surface of the locking nut (23) close to the swing arm, and when the locking nut locks the swing arm, the friction force between the plurality of protrusions (231) and the swing arm is smaller than the friction force between the first friction surface and the swing arm.

2. A tennis racket cord tightening device according to claim 1, characterized in that: Mounting grooves (11) are provided on both sides of the strip groove (10), the strip member (24) is arranged in the mounting groove (11), the strip member (24) is an elastic member, and when the strip member (24) is in a free state without being subjected to pressure, the first friction surface (241) protrudes from the upper surface of the supporting platform (1).

3. A tennis racket cord tightening device according to claim 2, characterized in that: A guide groove (232) is axially arranged on the end surface of the locking nut (23) close to the swing arm and is arranged in a one-to-one correspondence with the plurality of protrusions (231); the protrusions (231) are guided in the guide groove (232); a compression spring (233) is arranged between the bottom of the guide groove and the protrusions; and a limiting portion (234) for limiting the protrusions (231) is arranged at the lower end of the guide groove.

4. A tennis racket cord tightening device according to claim 3, characterized in that: A plurality of threaded blind holes (230) are provided on the lower end surface of the locking nut (23) in one-to-one correspondence with the plurality of protruding portions, a columnar member (231a) is internally threadedly connected to the threaded blind hole (230), and the guide groove (232) is provided in the columnar member (231a).

5. A tennis racket cord tightening device according to claim 4, characterized in that: The screw rod (21) comprises a first section (210) non-rotatably engaged with the strip groove (10), a second section (211) rotationally engaged with the swing arm (22), and a threaded section (212).

6. A tennis racket cord tightening device according to claim 5, characterized in that: A rigid rod (213) is provided at one end of the swing arm (22) away from the screw rod (21), a rigid sleeve (214) is provided on the outer sliding sleeve of the rigid rod (213), a clamp (215) is provided at the end of the rigid sleeve (214), and the rigid rod (213) is arranged in parallel with the screw rod (21).

7. A tennis racket cord tightening device according to claim 6, characterized in that: The strip-shaped groove (10) is an arc-shaped structure.

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