Finish machining equipment for sword handle

Abstract

The invention discloses finish machining equipment for a sword handle in the technical field of artware production, the finish machining equipment comprises a handle and a handle, the handle comprises two symmetrically arranged substrates, the finish machining equipment comprises a machining mechanism, and the substrates can be mounted in the machining mechanism in a handle state; the machining mechanism is used for polishing and carving the surfaces of the base parts forming the cutter handle state. The number of the clamping mechanisms corresponds to that of the base parts, the clamping mechanisms are arranged on the inner walls of the base parts, and the clamping mechanisms can enable the two base parts of the knife handle to be mutually locked when the knife handle is inserted into the knife handle; the clamping mechanism can temporarily lock the two base parts of the cutter handle when the base parts are installed in the machining mechanism, through the two clamping states of the clamping mechanism, the base parts can be integrally machined in the cutter handle state on the premise that follow-up assembly of the base parts on the cutter handle is not affected, and it is avoided that due to the fact that the base parts are separately machined at the splicing gaps of the base parts, the machining efficiency is greatly improved. And the appearance forms such as patterns cannot be butted after the base parts are spliced, so that the product quality is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of handicraft production, in particular to a finishing device for a sword handle. Background Art

[0002] In the production process of the sword handle, two basic parts are usually processed first, and then the two basic parts are spliced ​​together in the front and back positions of the handle and clamp the handle part to form a handle together.

[0003] When it comes to tool handles with complex surface engraving patterns, the two base parts are processed separately and then spliced. This means that in order to align the patterns on the two base parts, high precision is required for the base part processing during the processing, making the processing more difficult. At the same time, it is easy for the finished product gap alignment to be low, affecting the final quality of the finished product.

[0004] Based on this, the present invention designs a finishing device for a sword handle to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a finishing equipment for the handle of a sword, so as to solve the problem raised in the above background technology that when it comes to a handle with a relatively complex surface engraving pattern, since the two base parts are processed separately and then spliced, in order to align the patterns on the two base parts, high precision requirements are placed on the base part processing during the processing, which makes the processing more difficult. At the same time, it is also easy to have a low gap alignment in the finished product, which affects the final quality of the finished product.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a finishing device for a sword handle, comprising a handle and a hilt, the handle being inserted into the hilt, the hilt comprising two symmetrically arranged base members, the base member being provided with a first mounting groove for preventing the handle from being inserted, comprising a processing mechanism, the base member being able to be installed in the processing mechanism in a hilt state, the processing mechanism being used for integrated grinding and carving of the surface of the base member constituting the hilt state; a clamping mechanism corresponding to the number of the base members, the clamping mechanism being arranged on the inner wall of the base member, the clamping mechanism being able to lock the two base members of the hilt with each other when the handle is inserted into the hilt; the clamping mechanism being able to temporarily lock the two base members of the hilt when the base member is installed in the processing mechanism.

[0007] As a further solution of the present invention, the processing mechanism includes a supporting mechanism, the supporting mechanism is fixedly connected to a driving motor, the output shaft at the upper end of the driving motor is fixedly connected to a turntable, the turntable is vertically penetrated by a plurality of mounting holes distributed in a circular array with the output shaft of the driving motor as the center, the mounting holes are each provided with a plug-in mechanism, the plug-in mechanism is used to insert and fix a tool handle spliced ​​between two base parts, a driving mechanism is provided below the turntable, the driving mechanism is used to control the plug-in mechanism to insert or pull out the tool handle, and an engraving machine is provided above the turntable, the engraving machine is used to engrave the base parts.

[0008] As a further solution of the present invention, the plug-in mechanism includes a mounting seat, the mounting seat is vertically slidably connected with a first push block, second push blocks are arranged on both sides of the first push block, the lower end of the second push block is elastically slidably connected to the upper end of the mounting seat, the adjacent sides of the first push block and the second push block are arranged with a wedge angle for pushing the second push block away from the first push block, the driving mechanism is used to control the vertical displacement of the first push block and the second push block, and a limiting mechanism is arranged above the mounting seat, and the limiting mechanism is used to limit the base component during the process of inserting the plug-in mechanism into the base component.

[0009] As a further solution of the present invention, the limiting mechanism includes a round table, which is vertically elastically slidably connected to the mounting hole, and a second mounting groove is vertically opened on the round table. A slide is vertically slidably connected to the side wall of the second push block, and the slide is horizontally slidably connected to the inner wall of the second mounting groove. A pressure plate is arranged above the turntable, and the pressure plate is fixedly connected to the supporting mechanism, and the pressure plate is used to prevent the base component from moving vertically upward.

[0010] As a further solution of the present invention, the driving mechanism includes a first sliding rod, which is fixedly connected to a side of the mounting seat away from the driving motor, and the second push block is fixedly connected to a second sliding rod on a side away from the driving motor. The upper end of the support mechanism is respectively fixedly connected to a first slide rail and a second slide rail arranged around the driving motor, the first sliding rod is slidably connected to the first slide rail, and the second sliding rod is slidably connected to the second slide rail, and the first slide rail and the second slide rail are used to control the vertical displacement of the first slide rod and the second slide rod.

[0011] As a further solution of the present invention, the locking mechanism includes a first mounting plate, both side walls of the first mounting groove are provided with connecting grooves, the first mounting plate is riveted into the left connecting groove of the base member, the right connecting groove of the base member is riveted to the second mounting plate, the right end of the first mounting plate is located at the front side and is fixedly connected to a clamping plate, the left end of the second mounting plate is vertically fixedly connected to a connecting plate, the lower end of the connecting plate is longitudinally slidable and rotatably connected to a sliding rod, the front end of the sliding rod is fixedly connected to a spring sheet, the spring sheet is inclined to the rear side, and the front end of the connecting plate is fixedly connected to a guide block.

[0012] As a further solution of the present invention, a chamfer is provided on a side of the spring sheet close to the connecting plate.

[0013] As a further solution of the present invention, the handle is provided with anti-slip protrusions, and the connecting plate is provided with anti-slip grooves, and the anti-slip protrusions can engage with the anti-slip grooves.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses two engaging states of the engaging mechanism to temporarily engage the base member in the processing mechanism. When the base member is installed on the knife handle, the engaging mechanisms are locked with each other, so that the base member can be integrated in the knife handle state without affecting the subsequent assembly on the knife handle, thereby avoiding the gap in the base member joints, resulting in the inability to connect the appearance of the graphics and other forms of the base members after splicing due to the separate processing of the base members, resulting in a decrease in product quality.

[0015] The present invention performs processing operations by driving a plurality of plug-in and pull-out mechanisms through a turntable to cyclically pass under the engraving machine for processing, so that the use process of the equipment is more coherent, the time of the engraving machine processing process can be reasonably used, and the working efficiency of the engraving machine is higher, thereby making the equipment processing efficiency higher.

[0016] The present invention utilizes the first push block to squeeze the second push block, so that the two second push blocks can open or contract with each other, thereby making it convenient to insert or pull out the knife handle by opening or contracting the two second push blocks during the process of inserting the knife handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 for Figure 2 A schematic diagram of the structure enlargement in the middle; Figure 4 is a structural schematic diagram of a base component and its internal structure; Figure 5 for Figure 4 Schematic diagram of the left section structure; Figure 6 for Figure 4 Schematic diagram of the right cross-section structure; Figure 7 It is a schematic diagram of the structure after the first mounting plate, the second mounting plate and the structure thereon are spliced ​​together.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows: Base member 11, first mounting groove 12, drive motor 21, turntable 22, mounting hole 23, engraving machine 24, support mechanism 25, mounting seat 31, first push block 32, second push block 33, round table 41, second mounting groove 42, slide plate 43, pressure plate 44, first slide bar 51, second slide bar 52, first slide rail 53, second slide rail 54, first mounting plate 61, second mounting plate 62, card plate 63, connecting plate 64, slide bar 65, spring piece 66, guide block 67, connecting groove 68. DETAILED DESCRIPTION

[0019] See also Figure 1-7 The present invention provides a technical solution: a finishing device for a sword handle, comprising a handle and a hilt, the handle being inserted into the hilt, the hilt comprising two symmetrically arranged base members 11, the base member 11 being provided with a first mounting groove 12 for preventing the hilt from being damaged, comprising a processing mechanism, the base member 11 being able to be mounted in the processing mechanism in a hilt state, the processing mechanism being used for integrated grinding and engraving of the surface of the base member 11 constituting the hilt state; The number of the engaging mechanisms corresponds to that of the base members 11, and the engaging mechanisms are arranged on the inner wall of the base members 11. The engaging mechanisms can lock the two base members 11 of the tool handle with each other when the handle is inserted into the tool handle; the engaging mechanisms can temporarily lock the two base members 11 of the tool handle when the base member 11 is installed in the processing mechanism.

[0020] During operation, firstly, two independent base members 11 are installed in the processing mechanism, and the two base members 11 are temporarily spliced ​​into a handle state through a snap-fit ​​mechanism, and then the processing mechanism performs surface grinding, engraving and other finishing operations on the base members 11 constituting the handle state. After the finishing is completed, the two base members 11 are discharged from the processing mechanism and unlocked from each other, and finally the two base members 11 are installed on the handle, at which time the snap-fit ​​mechanisms in the two base members 11 are locked with each other.

[0021] The present invention uses two engaging states of the engaging mechanism to temporarily engage the base member 11 in the processing mechanism. When the base member 11 is installed on the knife handle, the engaging mechanisms are locked with each other, so that the base member 11 can be integrated in the knife handle state without affecting the subsequent assembly on the knife handle, thereby avoiding the gap in the splicing of the base member 11. Due to the separate processing of the base member 11, the appearance of the graphics and other forms of the spliced ​​base member 11 cannot be connected, resulting in a decrease in product quality.

[0022] As a further scheme of the present invention, the processing mechanism includes a supporting mechanism 25, the supporting mechanism 25 is fixedly connected to a driving motor 21, the output shaft at the upper end of the driving motor 21 is fixedly connected to a turntable 22, the turntable 22 is vertically penetrated by a plurality of mounting holes 23 distributed in a circular array with the output shaft of the driving motor 21 as the center, and a plug-in mechanism is provided in each mounting hole 23, the plug-in mechanism is used to insert and fix the tool handle spliced ​​by two base members 11, a driving mechanism is provided below the turntable 22, the driving mechanism is used to control the plug-in mechanism to insert or pull out the tool handle, and an engraving machine 24 is provided above the turntable 22, the engraving machine 24 is used to engrave the base member 11.

[0023] During operation, firstly, two base components 11 are installed on a plug-in mechanism. During this process, the plug-in mechanism is operated by simulating a knife handle, and then the driving motor 21 drives the turntable 22 and then drives the plug-in mechanism to move toward the engraving machine 24, so that the engraving machine 24 performs fine processing on the base component 11 on the plug-in mechanism. After the processing is completed, the turntable 22 rotates again, so that the next plug-in mechanism carries the base component 11 to the bottom of the engraving machine 24 for processing; it should be noted that, during the process of the engraving machine 24 processing the base component 11, the turntable 22 stops rotating. During this process, the base component 11 of other plug-in mechanisms that are not under the engraving machine 24 is installed or removed.

[0024] The present invention performs processing operations by driving multiple plug-in and pull-out mechanisms through a turntable 22 to circulate under the engraving machine 24 for processing, making the equipment use process more coherent, so that the time of the engraving machine 24 processing process can be reasonably used, and at the same time making the engraving machine 24 work more efficient, thereby making the equipment processing efficiency higher.

[0025] As a further solution of the present invention, the plug-in mechanism includes a mounting seat 31, which is vertically slidably connected to a first push block 32, and second push blocks 33 are arranged on both sides of the first push block 32. The lower end of the second push block 33 is elastically slidably connected to the upper end of the mounting seat 31, and adjacent sides of the first push block 32 and the second push block 33 are provided with wedge angles for pushing the second push block 33 away from the first push block 32. The driving mechanism is used to control the vertical displacement of the first push block 32 and the second push block 33. A limiting mechanism is arranged above the mounting seat 31, and the limiting mechanism is used to limit the base member 11 during the process of inserting the plug-in mechanism into the base member 11.

[0026] During operation, the two base members 11 are aligned and placed above the plug-in mechanism. After the base member 11 is limited by the limiting mechanism, the driving mechanism controls the first push block 32 and the second push block 33 to move upward synchronously until the second push block 33 is completely inserted into the handle formed by the two base members 11, and then the second push block 33 stops moving upward, and the first push block 32 continues to move upward. During the upward movement of the first push block 32, the second push block 33 is squeezed by the wedge angle, so that the second push block 33 moves away from the first push block 32, and the two second push blocks 33 are further moved away from each other. The state of inserting the knife handle into the inside of the knife handle base member 11 is simulated, thereby triggering the locking mechanism in the two base members 11 to lock with each other and fix on the second push block 33. After the subsequent knife handle processing is completed, the first push block 32 is controlled by the driving mechanism to move downward for a distance, so that the wedge angle of the second push block 33 loses the wedge angle extrusion of the first push block 32, and then under the action of elastic force, the second push block 33 moves toward the direction of the first push block 32, so that the second push block 33 no longer fits and squeezes the inner wall of the knife handle (facilitating the separation of the plug-in mechanism and the knife handle), and then the processed knife handle is removed.

[0027] The present invention utilizes the first push block 32 to squeeze the second push block 33, so that the two second push blocks 33 can open or contract with each other, thereby making it convenient to insert or remove the knife handle by opening or contracting the two second push blocks 33 during the process of inserting the knife handle.

[0028] As a further solution of the present invention, the limiting mechanism includes a round table 41, which is vertically elastically slidably connected to the mounting hole 23, and a second mounting groove 42 is vertically opened on the round table 41. A slide plate 43 is vertically slidably connected to the side wall of the second push block 33, and the slide plate 43 is horizontally slidably connected to the inner wall of the second mounting groove 42. A pressure plate 44 is arranged above the turntable 22, and the pressure plate 44 is fixedly connected to the support mechanism 25. The pressure plate 44 is used to prevent the base member 11 from moving vertically upward.

[0029] During operation, in the initial state, the first push block 32 and the second push block 33 are both in the lowest position. At this time, the second push block 33 drives the round table 41 to sink into the mounting hole 23, so that a groove is formed at the mounting hole 23, and then the two base members 11 are aligned and inserted into the groove. After that, the turntable 22 rotates and drives the two base members 11 to move below the pressure plate 44, so that the lower end of the pressure plate 44 abuts against the upper end of the base member 11. Further, the groove cooperates with the pressure plate 44 to limit the movement of the base member 11, and then the first push block 32 and the second push block 33 begin to be inserted into the tool handle composed of the base member 11, and then the first push block After the first push block 32 and the second push block 33 are inserted into and fixed to the base member 11, the tool handle formed by the base member 11 has arrived at the engraving machine 24. At this time, the first push block 32 and the second push block 33 are synchronously displaced upward, so that the tool handle is completely exposed outside the mounting hole 23, which is convenient for the engraving machine 24 to perform processing (if the first push block 32 and the second push block 33 do not move upward synchronously, the tool handle will remain sunken in the mounting hole 23 under the fixing action of the first push block 32 and the second push block 33, so that the tool handle is partially sunken in the mounting hole 23, making it impossible for the engraving machine 24 to process the tool handle sunken in the mounting hole 23).

[0030] As a further solution of the present invention, the driving mechanism includes a first sliding rod 51, which is fixedly connected to the side of the mounting seat 31 away from the driving motor 21, and the second push block 33 is fixedly connected to the side away from the driving motor 21 with a second sliding rod 52, and the upper end of the support mechanism 25 is respectively fixedly connected to a first sliding rail 53 and a second sliding rail 54 arranged around the driving motor 21, the first sliding rod 51 is slidably connected to the first sliding rail 53, and the second sliding rod 52 is slidably connected to the second sliding rail 54, and the first sliding rail 53 and the second sliding rail 54 are used to control the vertical displacement of the first sliding rod 51 and the second sliding rod 52.

[0031] During operation, the driving motor 21 drives the turntable 22 to rotate, so that the turntable 22 drives the first push block 32 and the second push block 33 in the mounting hole 23 to rotate around the driving motor 21 through the mounting hole 23, and further makes the first slide bar 51 and the second slide bar 52 slide along the first slide rail 53 and the second slide rail 54 respectively, so that the first slide bar 51 and the second slide bar 52 are vertically displaced along the tracks of the first slide rail 53 and the second slide rail 54 respectively, and then the first push block 32 and the second push block 33 are controlled to complete the vertical displacement that can meet the function of the equipment.

[0032] The present invention uses the sliding connection of the slide rail and the slide rod to enable the first push block 32 and the second push block 33 to rotate at different angles relative to the drive motor 21 and perform vertical displacement of corresponding angles, so that the vertical displacement of the first push block 32 and the second push block 33 is more accurate and the process is more stable, while achieving a more streamlined structure.

[0033] As a further solution of the present invention, the locking mechanism includes a first mounting plate 61, and connecting grooves 68 are provided on both side walls of the first mounting groove 12. The first mounting plate 61 is riveted into the left connecting groove 68 of the base member 11, and the second mounting plate 62 is riveted into the right connecting groove 68 of the base member 11. The right end of the first mounting plate 61 is located at the front side and is fixedly connected with a clamping plate 63, and the left end of the second mounting plate 62 is vertically fixedly connected with a connecting plate 64. The lower end of the connecting plate 64 is longitudinally slidable and rotatably connected with a slide rod 65, and the front end of the slide rod 65 is fixedly connected with a spring piece 66, which is inclined to the rear side, and the front end of the connecting plate 64 is fixedly connected with a guide block 67.

[0034] During operation, the two base members 11 are aligned with each other in front of each other, so that the first mounting plates 61 in the two base members 11 are aligned with the second mounting plates 62 in the other base member 11 respectively, and then the knife handle or the knife handle fitted by the first push block 32 and the second push block 33 is inserted upward from the lower end of the knife handle spliced ​​by the two base members 11. During the insertion process, the upper end of the knife handle pushes the spring piece 66 upward, so that the spring piece 66 rotates upward with the slide rod 65 as the axis. During the rotation process, the spring piece 66 moves toward the first mounting plate 61 under the action of the guide block 67 (the wedge surface of the guide block 67 is squeezed during the rotation of the spring piece 66), and further, the spring piece 66 can be engaged with the side of the card plate 63 away from the second mounting plate 62 during the rotation process. Furthermore, the elastic force of the spring piece 66 is used to make the card plate 63 and the connecting plate 64 have a tendency to move toward each other, so that the two base members 11 are squeezed and closed against each other.

[0035] The present invention utilizes the elastic force of the spring sheet 66 to squeeze and close the two base members 11 against each other and fix them. The structure is simple and there is no need to drive a connecting member from the outside when the base members 11 are connected, so that the appearance of the final hilt is more complete. At the same time, the connection process is simple, making the installation of the hilt more efficient and convenient.

[0036] As a further solution of the present invention, a chamfer is formed on one side of the spring piece 66 close to the connecting plate 64 .

[0037] During operation, when the spring piece 66 is fully engaged with the card plate 63, the chamfer of the spring piece 66 and the corners of the card plate 63 are squeezed against each other (the chamfer depth is greater than the thickness of the card plate 63), so that the spring piece 66 has a tendency to rotate downward under the squeezing of the card plate 63. Furthermore, after the handle is pulled out, the spring piece 66 has a certain reset ability, so that the first push block 32 and the second push block 33 fit the handle to process the base member 11, which facilitates the removal of the base member 11.

[0038] As a further solution of the present invention, the handle is provided with anti-skid protrusions, and the connecting plate 64 is provided with anti-skid grooves, and the anti-skid protrusions can engage with the anti-skid grooves.

Claims

1. A finishing device for a sword handle, comprising a handle and a hilt, wherein the handle is inserted into the hilt, the hilt comprising two symmetrically arranged base members (11), the base members (11) being provided with a first mounting groove (12) for preventing the handle from being inserted into the hilt, characterized in that: It comprises a processing mechanism, wherein the base member (11) can be installed in the processing mechanism in a tool handle state, and the processing mechanism is used to integrally grind and carve the surface of the base member (11) constituting the tool handle state; The number of the engaging mechanisms corresponds to that of the base members (11), the engaging mechanisms being arranged on the inner wall of the base members (11), and the engaging mechanisms being capable of locking the two base members (11) of the knife handle with each other when the knife handle is inserted into the knife handle; and the engaging mechanisms being capable of temporarily locking the two base members (11) of the knife handle when the base member (11) is installed in a processing mechanism.

2. The finishing equipment for sword handle according to claim 1, characterized in that: The processing mechanism comprises a support mechanism (25), the support mechanism (25) being fixedly connected to a drive motor (21), the output shaft at the upper end of the drive motor (21) being fixedly connected to a turntable (22), the turntable (22) being vertically penetrated by a plurality of mounting holes (23) distributed in a circular array with the output shaft of the drive motor (21) as the center, each mounting hole (23) being provided with a plug-in mechanism, the plug-in mechanism being used to insert and fix a tool handle spliced ​​by two base members (11), a drive mechanism being provided below the turntable (22), the drive mechanism being used to control the plug-in mechanism to insert or pull out the tool handle, and an engraving machine (24) being provided above the turntable (22), the engraving machine (24) being used to engrave the base member (11).

3. The finishing equipment for sword handle according to claim 2, characterized in that: The plug-in mechanism comprises a mounting seat (31), the mounting seat (31) being vertically slidably connected to a first push block (32), second push blocks (33) being arranged on both sides of the first push block (32), the lower end of the second push block (33) being elastically slidably connected to the upper end of the mounting seat (31), adjacent sides of the first push block (32) and the second push block (33) being arranged with a wedge angle for pushing the second push block (33) away from the first push block (32), the driving mechanism being used to control the vertical displacement of the first push block (32) and the second push block (33), and a limiting mechanism being arranged above the mounting seat (31), the limiting mechanism being used to limit the base member (11) during the process of the plug-in mechanism being inserted into the base member (11).

4. The finishing equipment for sword handle according to claim 3, characterized in that: The limiting mechanism comprises a round table (41), the round table (41) is vertically elastically slidably connected to the mounting hole (23), the round table (41) is vertically provided with a second mounting groove (42), the side wall of the second push block (33) is vertically slidably connected with a slide plate (43), the slide plate (43) is horizontally slidably connected to the inner wall of the second mounting groove (42), a pressing plate (44) is arranged above the turntable (22), the pressing plate (44) is fixedly connected to the supporting mechanism (25), and the pressing plate (44) is used to prevent the base member (11) from vertically moving upward.

5. The finishing equipment for sword handle according to claim 4, characterized in that: The driving mechanism comprises a first sliding bar (51), the first sliding bar (51) being fixedly connected to a side of the mounting seat (31) away from the driving motor (21), the second pushing block (33) being fixedly connected to a side of the driving motor (21), the first sliding rail (53) and the second sliding rail (54) being fixedly connected at the upper end of the supporting mechanism (25), the first sliding bar (51) being slidably connected to the first sliding rail (53), the second sliding bar (52) being slidably connected to the second sliding rail (54), and the first sliding rail (53) and the second sliding rail (54) being used to control the vertical displacement of the first sliding bar (51) and the second sliding bar (52).

6. The finishing equipment for sword handle according to claim 5, characterized in that: The engaging mechanism comprises a first mounting plate (61), both side walls of the first mounting groove (12) are provided with connecting grooves (68), the first mounting plate (61) is riveted into the left connecting groove (68) of the base member (11), the right connecting groove (68) of the base member (11) is riveted to the second mounting plate (62), the right end of the first mounting plate (61) is located at the front side and is fixedly connected to a clamping plate (63), the left end of the second mounting plate (62) is vertically fixedly connected to a connecting plate (64), the lower end of the connecting plate (64) is longitudinally slidable and rotatably connected to a sliding rod (65), the front end of the sliding rod (65) is fixedly connected to a spring sheet (66), the spring sheet (66) is inclined toward the rear side, and the front end of the connecting plate (64) is fixedly connected to a guide block (67).

7. The finishing equipment for sword handle according to claim 6, characterized in that: The spring sheet (66) is provided with a chamfer on one side close to the connecting plate (64).

8. The finishing equipment for sword handle according to claim 7, characterized in that: The knife handle is provided with an anti-skid protrusion, and the connecting plate (64) is provided with an anti-skid groove, and the anti-skid protrusion can engage with the anti-skid groove.

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