Connecting lock assembly and display screen
By designing a locking and adjusting connection lock assembly, the problem that traditional LED displays cannot adapt to inconsistent hole positions and thicknesses in different cabinet frames is solved, thus achieving stable splicing and efficient display of the screen.
Patent Information
- Application Number
- CN202423273541.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Traditional LED display screen connection lock components cannot adapt to the inconsistencies in hole positions and thicknesses between different cabinet frames, resulting in low practicality.
A connecting lock assembly was designed, including a locking structure and an adjusting structure. The locking stroke of the lock cylinder is controlled by the lock sleeve, lock cylinder, handle assembly and adjusting handle, and it is suitable for box frames of different thicknesses and hole sizes.
The connection lock assembly is designed to be compatible with cabinet frames of different thicknesses and hole sizes, ensuring the splicing and display effects of the display screen, reducing wear, and enhancing stability and rotation capability.
Smart Images

Figure CN223694116U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to display screen splicing technical field especially, a kind of connecting lock assembly and display screen. BACKGROUND
[0002] For LED display screen, the connection between its box frame is very important, and the connecting lock assembly of traditional LED display screen is limited by the hole position and thickness between box frames, leading to the inconsistency of hole position and thickness between different box frames cannot be applied, low practicality. INVENTION CONTENTS
[0003] The utility model provides a connecting lock assembly and display screen, solve the problem that the connecting lock assembly of prior art cannot be applied to different box frames with inconsistent hole position and thickness.
[0004] According to the first aspect of the utility model, the utility model provides a connecting lock assembly for connecting two adjacent display screen units, the connecting lock assembly comprises:
[0005] Locking structure, including lock seat, lock core, lock sleeve and handle assembly, the lock sleeve is installed in the lock seat and can be active along the axial direction of the lock seat, one end of the lock core passes through the lock sleeve and extends from the lock seat, the handle assembly is connected with the other end of the lock core, for driving the lock core relative to the lock sleeve rotation, to realize the unlocking or locking between two display screen units;
[0006] Adjusting structure, including adjusting handle and control member movably installed in the display screen unit, one of the control member and the lock sleeve has control protrusion, one of the control member and the lock sleeve has control groove, the adjusting handle is connected with at least the circumferential clearance of the control member, to drive the control member rotates around the control member axial center between first position and second position, so that the lock sleeve can be locked by the control protrusion and control groove It realizes the control of the locking stroke of the lock core.
[0007] In the connecting lock assembly of the utility model embodiment, the control member includes annular stopper, at least two control protrusions are formed on the side of the annular stopper towards the lock sleeve, and the lock sleeve is provided with control groove matched with the control protrusion on the side of the annular stopper towards the lock sleeve.
[0008] In the connecting lock assembly of the utility model embodiment, first positioning member is arranged on the adjusting handle, and the first positioning member is used for cooperating with second positioning member on the display screen unit, so as to keep the adjusting handle at any position between the first position and the second position.
[0009] In the connecting lock assembly of the embodiment of the utility model, the first positioning member comprises a first elastic member and a first abutting portion, a first installation groove is formed in the adjusting handle, the first elastic member and the first abutting portion are accommodated in the first installation groove, and at least part of the first abutting portion protrudes out of the first installation groove under the elastic force of the first elastic member.
[0010] In the connecting lock assembly of the embodiment of the utility model, the second positioning member comprises a groove structure matched with the shape of the first abutting portion, and the groove structure is arranged on the first position and the second position.
[0011] In the connecting lock assembly of the embodiment of the utility model, the shape of the first abutting portion is a spherical structure, and the curvature of the groove structure is matched with the diameter of the spherical structure.
[0012] In the connecting lock assembly of the embodiment of the utility model, the adjusting structure further comprises a locking member, and the adjusting handle is fixed on the annular stop block through the locking member.
[0013] In the connecting lock assembly of the embodiment of the utility model, the adjusting handle has a connecting end face, and the inner diameter of the connecting end face is matched with the outer diameter of the annular stop block.
[0014] According to the second aspect of the utility model, the utility model further provides a display screen, which comprises a display screen unit and the connecting lock assembly, the display screen unit comprises a box frame, the box frame is provided with a mounting hole, the control member is mounted in the mounting hole, at least part of the adjusting handle protrudes out of the mounting hole, and the lock seat is mounted on the outer end face of the mounting hole.
[0015] In the display screen of the embodiment of the utility model, the box frame is provided with an adjusting groove in communication with the mounting hole, the adjusting handle is movably mounted in the adjusting groove, and the first position and the second position are located at two ends of the adjusting groove respectively.
[0016] The technical scheme provided by the embodiment of the utility model can have the following beneficial effects: the connecting lock assembly and the display screen are designed, the adjusting handle can drive the control member to rotate around the axis of the control member between the first position and the second position, the lock sleeve can realize stroke control of the lock cylinder by cooperation of the control convex and the control groove, the connecting lock assembly can be applied to box frames with different thicknesses and different hole sizes, and the splicing effect and display effect of the display screen are ensured. In addition, the adjusting handle and the control member are connected in the at least circumferential no-gap mode, which can not only enhance the stability between the adjusting handle and the control member, but also eliminate the wear caused by the gap, and large-angle rotation can be realized.
[0017] It should be understood that the general description above and the detailed description below are only exemplary and explanatory, and do not limit the present application. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical schemes of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0019] Figure 1 is a schematic view of the connecting lock assembly provided by an embodiment of the present application installed on the box frame;
[0020] Figure 2 is a schematic view of the connecting lock assembly provided by an embodiment of the present application installed on the box frame; Figure 1
[0021] Figure 3 is a schematic view of the connecting lock assembly provided by an embodiment of the present application installed on the box frame; Figure 2
[0022] Figure 4 is a schematic view of the connecting lock assembly provided by an embodiment of the present application installed on the box frame; Figure 2
[0023] Figure 5 is a schematic view of the connecting lock assembly provided by an embodiment of the present application installed on the box frame; Figure 2
[0024] Figure 6 is a schematic view of the connecting lock assembly provided by an embodiment of the present application installed on the box frame; Figure 5
[0025] Figure 7 is a schematic view of the connecting lock assembly provided by an embodiment of the present application installed on the box frame; Figure 5
[0026] Figure 8 is a schematic view of the connecting lock assembly provided by an embodiment of the present application installed on the box frame; Figure 5
[0027] Figure 9 is a schematic view of the connecting lock assembly provided by an embodiment of the present application installed on the box frame; Figure 5
[0028] Figure 10 is a schematic view of the connecting lock assembly provided by an embodiment of the present application installed on the box frame; Figure 9
[0029] Figure 11 is a schematic view of the connecting lock assembly provided by an embodiment of the present application installed on the box frame. Figure 10
[0030] Legend of reference signs:
[0031] 100, connecting lock assembly;
[0032] 10, locking structure; 11, lock seat; 12, lock cylinder; 13, handle assembly; 131, driving handle; 132, locking wrench; 14, lock sleeve; 141, control groove; 142, strip hole; 143, second tooth portion; 15, second elastic member;
[0033] 20, adjusting structure; 21, control member; 211, control protrusion; 212, limiting hole; 22, adjusting handle; 221, first positioning member; 2211, first abutting portion; 2212, first elastic member; 222, locking member; 223, first mounting slot; 224, connecting section;
[0034] 200, box frame; 201, mounting hole; 202, adjusting slot; 203, second positioning member. DETAILED DESCRIPTION
[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0036] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments of the present application in the description of the present application. 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" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0037] Some embodiments of the present application will be described in detail below with reference to the drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.
[0038] As Figures 1 to 11 shown, according to the first aspect of the present application, the present application provides a connecting lock assembly 100 applied to a display screen, the display screen comprising a plurality of display screen units, the connecting lock assembly 100 being mounted on one cabinet frame 200 of two adjacent display screen units, and being used to quickly splice with another cabinet frame 200 of the two adjacent display screen units, so as to realize quick splicing of the two adjacent display screen units.
[0039] It should be noted that the connecting lock assembly 100 can be directly fixed on the cabinet frame 200, and the connecting lock assembly 100 can also be fixed on other connecting structures, and then the connecting structure is fixed on the cabinet frame 200. The connecting structure can be a built-in structure of the cabinet frame 200, and the connecting structure can also be an external structure of the cabinet frame 200, which is not limited by the present application.
[0040] In the embodiment, the connecting lock assembly 100 comprises an adjusting structure 20 and a locking structure 10 for splicing of two adjacent display screen units. The locking structure 10 is mounted on the outer end face of the display screen unit, and the adjusting structure 20 is mounted in the mounting hole 201 of the display screen unit, and is used to adjust the radial clearance of the locking structure 10 through the cabinet frame 200 and the locking stroke, so that the locking structure 10 can be applied to the cabinet frame 200 with different thicknesses and mounting holes 201 with different sizes, thereby ensuring the splicing effect and display effect of the display screen.
[0041] In an optional embodiment, the locking structure 10 comprises a lock seat 11, a lock core 12, a lock sleeve 14 and a handle assembly 13. The lock sleeve 14 is mounted in the lock seat 11 and can move along the axial direction of the lock seat 11. One end of the lock core 12 passes through the lock sleeve 14 and extends from the lock seat 11. The handle assembly 13 is connected with the other end of the lock core 12, and is used to drive the lock core 12 to rotate relative to the lock sleeve 14, so as to realize unlocking or locking between the two display screen units. The adjusting structure 20 cooperates with the lock sleeve 14, so that the lock sleeve 14 can be maintained at a preset position of the lock seat 11, thereby the locking stroke of the lock core 12 can be controlled, so that the locking structure 10 can be applied to cabinet frames 200 with different thicknesses.
[0042] For example, when two adjacent box frames 200 are spliced by the locking structure 10, since the thickness of the box frame 200 is inconsistent with the expected thickness, the relative position of the lock sleeve 14 and the lock seat 11 can be adjusted by the adjusting structure 20 after the splicing of the box frame 200, so as to control the locking stroke of the lock cylinder 12, which can not only ensure the splicing effect and display effect of the display screen, but also does not need to replace the locking structure 10, avoids manual operation, and saves manpower. In addition, since the adjusting structure 20 is installed in the mounting hole 201 of the box frame 200, the lock cylinder 12 is at least partially movably arranged in the mounting hole 201. Therefore, the present application can also limit the hole diameter of the mounting hole 201 by the adjusting structure 20, so as to limit the radial position of the lock cylinder 12, so that the locking structure 10 can be applied to mounting holes 201 of different sizes, avoiding that different box frames 200 cannot limit the radial position of the lock cylinder 12 due to inconsistent mounting holes 201, so as to not be well spliced with another box frame 200.
[0043] In an optional embodiment, the adjusting structure 20 includes an adjusting handle 22 and a control member 21 movably mounted in the display screen unit, and the adjusting handle 22 is in at least circumferential non-clearance connection with the control member 21 to drive the control member 21 to rotate around the axis of the control member 21 between the first position and the second position, so that the lock sleeve 14 can cooperate with the control member 21 at different angles to control the locking stroke of the lock cylinder 12. Wherein, by the at least circumferential non-clearance connection between the adjusting handle 22 and the control member 21, the stability between the adjusting handle 22 and the control member 21 can be enhanced, and the wear caused by the clearance can be avoided, and large-angle rotation can be realized.
[0044] In an optional embodiment, one of the control member 21 and the lock sleeve 14 has a control protrusion 211, and the other one of the control member 21 and the lock sleeve 14 has a control groove 141, and the control protrusion 211 cooperates with the control groove 141 to control the locking stroke of the lock cylinder 12, so that the locking structure 10 can be applied to box frames 200 of different thicknesses.
[0045] In an optional embodiment, the control member 21 includes an annular stopper, and at least two control protrusions 211 are formed on the side of the annular stopper facing the lock sleeve 14, and the lock sleeve 14 is provided with a control groove 141 cooperating with the control protrusions 211 on the side of the annular stopper.
[0046] Exemplarily, the number of the control protrusions 211 and the control grooves 141 is two, the two control protrusions 211 are symmetrically arranged relative to the central axis of the annular stopper, and the two control grooves 141 are symmetrically arranged relative to the central axis of the lock sleeve 14. When the control member 21 is in the first position, the two control protrusions 211 are embedded in the two control grooves 141 to control the locking stroke of the lock cylinder 12; when the control member 21 is in the second position, the two control protrusions 211 abut on the outer end surfaces of the two control grooves 141 to control the locking stroke of the lock cylinder 12.
[0047] In an optional embodiment, the middle part of the annular stopper is formed with a limiting hole 212, the inner diameter and shape of the limiting hole 212 are matched with the outer diameter and shape of the lock cylinder 12, so that the lock cylinder 12 can be arranged in and move in the limiting hole 212.
[0048] It should be noted that the outer diameter of the annular stopper can be set according to the inner diameter of the mounting hole 201, that is, different sizes of the mounting hole 201 can be matched with different outer diameters of the annular stopper, so that the annular stopper can be matched with the locking structure 10 and applied to different sizes of the mounting hole 201.
[0049] In an optional embodiment, the adjusting handle 22 is provided with a first positioning member 221, and the display screen unit is provided with a second positioning member 203, the first positioning member 221 is used to cooperate with the second positioning member 203 to keep the adjusting handle 22 at any position between the first position and the second position, so as to control the locking stroke of the lock cylinder 12.
[0050] It should be noted that the first positioning member 221 can be any shape, such as a circular ring type, an arc surface type, a spherical shape or other irregular shapes, and the shape of the second positioning member 203 is matched with the shape of the first positioning member 221, which is not limited in the present application, and the main purpose is to keep the adjusting handle 22 at any position between the first position and the second position.
[0051] In an optional embodiment, the first positioning member 221 includes a first elastic member 2212 and a first abutting portion 2211, and the adjusting handle 22 is formed with a first mounting groove 223, and the first elastic member 2212 and the first abutting portion 2211 are accommodated in the first mounting groove 223. At least part of the first abutting portion 2211 is stretched out of the first mounting groove 223 under the elastic force of the first elastic member 2212, and is used to cooperate with the second positioning member 203, so as to better limit the rotation angle of the adjusting handle 22.
[0052] In an optional embodiment, the second positioning member 203 includes a groove structure matched with the shape of the first abutting portion 2211, and the groove structure is arranged on the first position and the second position.
[0053] In an optional embodiment, the first abutting part 2211 is in a spherical structure, and the curvature of the groove structure is adapted to the diameter of the spherical structure. The spherical structure can reduce the friction with the cabinet frame 200 when the adjustment handle 22 rotates relative to the cabinet frame 200, and improve the smoothness of sliding.
[0054] For example, when the first positioning part 221 is assembled, the first elastic part 2212 is first placed in the first mounting groove 223, and then the first abutting part 2211 is placed in the first mounting groove 223, so that the first abutting part 2211 can move along the axis of the first mounting groove 223 after the compression or release of the first elastic part 2212. When the adjustment handle 22 rotates relative to the cabinet frame 200, the first abutting part 2211 always abuts against the end surface of the cabinet frame 200, and the spherical structure can reduce the contact surface with the cabinet frame 200, which can reduce the wear of the end surface of the cabinet frame 200 in contact with the first abutting part 2211, and can also ensure that the adjustment handle 22 can rotate smoothly on the cabinet frame 200.
[0055] In an optional embodiment, the adjustment structure 20 further comprises a locking part 222, and the adjustment handle 22 is fixed on the annular stop block through the locking part 222. The locking part 222 includes but is not limited to a screw structure.
[0056] In an optional embodiment, the adjustment handle 22 has a connecting section 224, and the size of the connecting section 224 is adapted to the size of the adjustment groove 202 on the cabinet frame 200, so that the connecting section 224 can be connected to the control part 21 after extending into the adjustment groove 202.
[0057] In an optional embodiment, the adjustment handle 22 has a connecting end surface, and the inner diameter of the connecting end surface is adapted to the outer diameter of the annular stop block, so that the circumference of the adjustment handle 22 can be arranged without gap with the circumference of the annular stop block, to ensure the stability of the adjustment handle 22 after being connected to the control part 21.
[0058] In an optional embodiment, the handle assembly 13 comprises a driving handle 131 and a locking wrench 132, the driving handle 131 is fixedly connected with the lock cylinder 12, and the locking wrench 132 is rotatably installed in the driving handle 131 and is used to cooperate with the lock sleeve 14 to limit the rotation of the driving handle 131 relative to the lock sleeve 14, thereby achieving the locking effect.
[0059] For example, the locking wrench 132 is provided with a first tooth part, the lock sleeve 14 is provided with a second tooth part 143, and the first tooth part cooperates with the second tooth part 143 to limit the rotation of the driving handle 131 relative to the lock sleeve 14.
[0060] In an optional embodiment, the locking structure 10 comprises a second elastic member 15 located between the driving handle 131 and the lock seat 11, for applying a pushing force to the driving handle 131, so that the driving handle 131 can drive the lock cylinder 12 to move away from the lock seat 11.
[0061] In an optional embodiment, the outer side of the lock sleeve 14 is provided with a strip-shaped hole 142 for cooperating with a limiting protrusion on the lock seat 11 to limit the movement of the lock sleeve 14 along the circumferential direction of the lock seat 11. The limiting protrusion can be a screw fixed on the lock seat 11, which is not limited in the present application.
[0062] As shown in the drawings, Figures 1 to 11 According to the second aspect of the present application, the present application provides a display screen comprising a display screen unit and the connecting lock assembly 100 described above, the display screen unit comprising a box frame 200, the box frame 200 being provided with a mounting hole 201, the control member 21 being mounted in the mounting hole 201, at least part of the adjusting handle 22 extending out of the mounting hole 201, and the lock seat 11 being mounted on the outer end face of the mounting hole 201.
[0063] In an optional embodiment, the box frame 200 is provided with an adjusting groove 202 communicating with the mounting hole 201, and the adjusting handle 22 is movably mounted in the adjusting groove 202, the first position and the second position being located at two ends of the adjusting groove 202, respectively.
[0064] It should be noted that the connecting lock assembly 100 of the present application has the same technical effects as the connecting lock assembly 100 in the above-mentioned embodiments, and will not be described here. The parts not mentioned in the present application can be referred to the relevant introduction of the foregoing embodiments, which will not be described here.
[0065] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected. It can be mechanically connected, or it can be electrically connected. It can be directly connected, or it can be indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0066] In the present application, unless specifically stated and limited otherwise, the phrase "on" or "under" a first feature with respect to a second feature can include the first and second features being in direct contact, or can include the first and second features not being in direct contact but being in contact through another feature between them. Also, the first feature "on", "above" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.
[0067] The above disclosure provides many different embodiments or examples for implementing different structures of the present application. For the purpose of simplification, the components and arrangements of specific examples are described in the above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to the reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the application of other processes and / or the use of other materials.
[0068] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
Claims
1. A connecting lock assembly for connecting two adjacent display screen units, characterized in that, The connecting lock assembly comprises: a locking structure comprising a lock base, a lock cylinder, a lock sleeve and a handle assembly, the lock sleeve being mounted in the lock base and movable in the axial direction of the lock base, one end of the lock cylinder penetrating through the lock sleeve and extending out of the lock base, the handle assembly being connected with the other end of the lock cylinder for driving the lock cylinder to rotate relative to the lock sleeve to realize unlocking or locking between the two display screen units; an adjusting structure comprising an adjusting handle and a control member movably mounted in the display screen unit, one of the control member and the lock sleeve being provided with a control protrusion, and the other of the control member and the lock sleeve being provided with a control groove, the adjusting handle being connected with the control member in at least a circumferential gap-free manner to drive the control member to rotate around the axis of the control member between a first position and a second position, so that the lock sleeve can control the locking stroke of the lock cylinder through the cooperation of the control protrusion and the control groove.
2. The connection lock assembly of claim 1, wherein, The control member comprises an annular stopper, at least two control protrusions being formed on the side of the annular stopper facing the lock sleeve, and the lock sleeve is provided on the side facing the annular stopper with a control groove matched with the control protrusions.
3. The connection lock assembly of claim 2, wherein, The adjusting handle is provided with a first positioning member for cooperating with a second positioning member on the display screen unit to keep the adjusting handle at any position between the first position and the second position.
4. The connection lock assembly of claim 3, wherein, The first positioning member comprises a first elastic member and a first abutting portion, a first mounting groove is formed in the adjusting handle, the first elastic member and the first abutting portion are accommodated in the first mounting groove, and at least part of the first abutting portion extends out of the first mounting groove under the elastic force of the first elastic member.
5. The connection lock assembly of claim 4, wherein, The second positioning member comprises a groove structure matched in shape with the first abutting portion, and the groove structure is arranged on the first position and the second position.
6. The connection lock assembly of claim 5, wherein, The first abutting portion is in the shape of a spherical structure, and the curvature of the groove structure is matched with the diameter of the spherical structure.
7. The connection lock assembly of claim 3, wherein, The adjusting structure further comprises a locking member, and the adjusting handle is fixed on the annular stopper through the locking member.
8. The connection lock assembly of claim 3, wherein, The adjusting handle has a connecting end face, and the inner diameter of the connecting end face is matched with the outer diameter of the annular stopper.
9. A display screen, characterized by The display screen unit comprises a box frame, the box frame is provided with a mounting hole, the control member is mounted in the mounting hole, at least part of the adjusting handle extends out of the mounting hole, and the lock base is mounted on the outer end face of the mounting hole.
10. The display screen of claim 9, wherein, The box frame is provided with an adjusting groove communicating with the mounting hole, the adjusting handle is movably mounted in the adjusting groove, and the first position and the second position are respectively located at two ends of the adjusting groove.