Bolt deck peg

Abstract

The present invention relates to a bolt deck peg, comprising: a loop part having a loop in the form of a ring; a bolt part provided in a lower portion of the loop, extending in the height direction and having a screw thread on the outer surface thereof; a fixed part provided at a lower portion of the bolt part and fixed to a lower portion of the deck; and a nut part fitted onto the bolt part, wherein the fixed part passes through a gap formed between decks and is fixed to the lower portion of the deck.

Description

Bolt Deck Pack

[0001] The present invention relates to a bolt deck pack, and more particularly, to a bolt deck pack that can firmly fix the deck pack to a deck through a fastening method of bolts and nuts, and can firmly install the fixing part on the lower part of a deck even when the spacing between decks is not constant through a tapered fixing part having a sawtooth part.

[0002] Recently, the number of campers enjoying nature through camping has been increasing. As the number of campers increases, interest in camping-related facilities, equipment, and tools has also increased, leading to the development of various types of camping facilities, equipment, and tools.

[0003] Among camping gear, deck packs are used to set up outdoor tents on a campsite's wooden deck. They connect the tent's ropes to the deck, and various types of deck packs are available.

[0004] Utility Model Publication No. 20-0492518 (published on July 17, 2020) and Utility Model Publication No. 20-0494311 (published on September 10, 2021) disclose conventional deck packs. The deck pack disclosed in Utility Model Publication No. 20-0492518 (published on July 17, 2020) uses a method of fixing the deck pack to the deck by elastically supporting it through a conical compression coil spring. Utility Model Publication No. 20-0494311 (published on September 10, 2021) uses a method of fixing the deck pack to the deck by elastically supporting it through a torsion spring.

[0005] Conventional deck packs, like these, use elastic materials, such as compression coil springs or torsion springs, to secure the deck pack to the deck. However, conventional deck packs using elastic materials suffer from the following problems.

[0006] First, when using elastic materials such as compression coil springs or torsion springs, the bonding strength between the deck and deck pack decreases due to the elasticity of the elastic material decreasing with increased use. Consequently, when strong winds blow at the campsite, the deck pack structurally sways upward, downward, left, and right, resulting in reduced stability.

[0007] Meanwhile, wooden decks installed at campsites are typically 18 to 30 mm thick, and this thickness varies from campsite to campsite. When securing a deck pack using elastic materials, such as compression coil springs or torsion springs, the length of the elastic materials may vary due to the varying thickness of the wooden deck.

[0008] Accordingly, when fixing the deck pack using an elastic body such as a compression coil spring or a torsion spring, there is a problem in that the wooden deck and the deck pack cannot be firmly fixed because the elastic force is not constant according to the change in length.

[0009] Additionally, the gap between the wooden decks installed at the campsite varies from 3.0 to 10 mm. This irregularity in the gaps between the wooden decks can result in large gaps between the wooden decks, which can lead to the elastic deck packs not being properly secured to the wooden decks.

[0010] (Patent Document 1) 1. Utility Model Registration No. 20-0492518 (published on July 17, 2020)

[0011] (Patent Document 2) 2. Utility Model Registration No. 20-0494311 (Published on September 10, 2021)

[0012] The present invention is intended to solve the above-described problem, and more specifically, relates to a bolt deck pack that can firmly fix a deck pack to a deck through a bolt and nut fastening method, and can firmly install the fixing part on the lower part of a deck even when the spacing between decks is not constant through a tapered fixing part having a toothed part.

[0013] According to one embodiment, a bolt deck pack is a deck pack fixed to a deck, comprising: a ring portion having a ring in a ring shape; a bolt portion provided at a lower portion of the ring portion and extending in the height direction, the bolt portion having a screw thread on an outer surface; a fixing portion provided at a lower portion of the bolt portion and fixed to the lower portion of the deck; and a nut portion fitted to the bolt portion; wherein the fixing portion is fixed to the lower portion of the deck by passing through a gap formed between decks.

[0014] The nut portion of the bolt deck pack according to one embodiment can secure the upper portion of the deck by being screwed to the bolt portion after the fixing portion is fixed to the lower portion of the deck.

[0015] A bolt deck pack according to one embodiment further includes a washer inserted into the bolt portion, and after the washer is inserted into the bolt portion, the nut portion is fastened to the bolt portion, and the washer can secure the upper portion of the deck.

[0016] According to one embodiment, the outer side of the fixed portion of the bolt deck pack is provided with a sawtooth portion having a sawtooth shape, and the sawtooth portion can come into contact with the lower portion of the deck.

[0017] According to one embodiment, the fixing portion of the bolt deck pack has a tapered shape that becomes wider from the top to the bottom, and a sawtooth portion having a sawtooth shape is provided on an inclined surface of the fixing portion having a tapered shape, and the sawtooth portion can come into contact with the lower portion of the deck.

[0018] The nut portion of the bolt deck pack according to one embodiment may be formed of a connecting member in which the nut and the washer are manufactured as one piece.

[0019] The above-described connecting member of the bolt deck pack according to one embodiment includes a handle portion that can be gripped by a user, and a washer portion that is provided on a lower portion of the handle portion and comes into contact with the deck to secure the upper portion of the deck, and the handle portion may be provided with a plurality of anti-slip grooves.

[0020] The present invention relates to a bolt deck pack, which has the advantage of being able to secure the deck pack to the upper part of the deck through a bolt and nut fastening method, and to secure the deck pack to the lower part of the deck through a tapered fixing part having a sawtooth part.

[0021] In addition, the present invention has the advantage of being able to firmly fix the deck pack to the deck regardless of the thickness of the deck by fixing the deck pack to the deck through a bolt and nut fastening method.

[0022] In addition, the present invention has the advantage of being able to increase the coefficient of friction between the lower part of the deck and the deck pack through a tapered fixing part having a sawtooth portion, thereby preventing the deck pack from coming off the deck.

[0023] In addition, the present invention has an advantage in that the deck pack can be firmly installed on the lower part of the deck even when the gap between decks is not constant, by fixing the deck pack to the lower part of the deck through a tapered fixing part having a sawtooth portion.

[0024] In addition, the present invention has the advantage of stably holding the tent line even in a strong wind by fixing the deck pack at the upper part of the deck through a bolt and nut fastening method and fixing the deck pack at the lower part of the deck through a tapered fixing part having a sawtooth part.

[0025] Figure 1 is a perspective view showing a ring portion and a bolt portion according to an embodiment of the present invention.

[0026] Figure 2 is a side view showing a ring portion and a bolt portion according to an embodiment of the present invention.

[0027] FIG. 3 is a perspective view showing a state in which a deck pack is assembled by combining a nut portion and a washer with a bolt portion according to an embodiment of the present invention.

[0028] FIG. 4 is a side view showing a state in which a deck pack is assembled by combining a nut portion and a washer with a bolt portion according to an embodiment of the present invention.

[0029] FIG. 5 is a front view showing a state in which a deck pack is assembled by combining a nut portion and a washer with a bolt portion according to an embodiment of the present invention.

[0030] FIG. 6 is a drawing showing a deck pack fixed to a deck according to an embodiment of the present invention.

[0031] Fig. 7(a) is a perspective view showing a joining member according to an embodiment of the present invention, and Fig. 7(b) is a cross-sectional view of the joining member according to an embodiment of the present invention.

[0032] FIG. 8 is a perspective view showing a state in which a deck pack is assembled while a joining member according to an embodiment of the present invention is joined to a bolt portion.

[0033] This specification clarifies the scope of the present invention and explains the principles of the invention and discloses embodiments thereof to enable those skilled in the art to practice the invention. The disclosed embodiments may be implemented in various forms.

[0034] Expressions such as “includes” or “may include” that may be used in various embodiments of the present invention indicate the existence of the disclosed function, operation, or component, etc., and do not limit one or more additional functions, operations, or components, etc. In addition, in various embodiments of the present invention, it should be understood that terms such as “includes” or “has” are intended to specify the existence of a feature, number, step, operation, component, part, or combination thereof described in the specification, and do not exclude in advance the possibility of the existence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0035] When a component is referred to as being "connected, coupled" to another component, it should be understood that while the component may be directly connected or coupled to the other component, there may also be a new component between the component and the other component. Conversely, when a component is referred to as being "directly connected" or "directly coupled" to another component, it should be understood that no new component exists between the component and the other component.

[0036] The terms "first," "second," etc., used herein may be used to describe various components, but the components should not be limited by the terms. The terms are used solely to distinguish one component from another.

[0037] The present invention relates to a bolt deck pack, which can firmly secure the deck pack to a deck through a bolt and nut fastening method, and which can firmly install the fixing part on the lower part of a deck even when the gap between decks is not constant through a tapered fixing part having a sawtooth part. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0038] A bolt deck pack according to an embodiment of the present invention is fixed to a deck (10), and the bolt deck pack according to an embodiment of the present invention can be inserted into a gap formed between one deck (10) and another deck (10).

[0039] A bolt deck pack according to an embodiment of the present invention includes a ring portion (110), a bolt portion (120), a fixing portion (130), and a nut portion (140).

[0040] Referring to FIGS. 1 and 2, the ring portion (110) is provided with a ring-shaped loop. The ring portion (110) can connect a tent rope, and the tent rope can be connected to the loop of the ring portion (110). The ring is provided with a through hole (111) for passing the tent rope through, and the ring can be formed in a ring shape.

[0041] Referring to FIGS. 1 and 2, the bolt portion (120) is provided at the lower portion of the ring portion (110) and extends in the height direction. The bolt portion (120) may be formed in a plate shape, a rod shape, a bar shape, etc., and a screw thread (121) may be provided on the outer surface of the bolt portion (120).

[0042] According to an embodiment of the present invention, the bolt portion (120) may be formed in a plate shape, a rod shape, or a bar shape having a rectangular cross-section, and the bolt portion (120) may extend in the height direction.

[0043] According to an embodiment of the present invention, the screw thread (121) may be provided on one side and the other side of the bolt portion (120) having a rectangular cross-section. Specifically, the screw thread (121) may be provided on a surface provided on one side and the other side in the horizontal direction of the rectangular cross-section. In this case, the horizontal length of the rectangular cross-section may be formed to be longer than the vertical length.

[0044] The screw thread (121) according to an embodiment of the present invention can be processed using a laser. The screw thread (121) can be precisely processed using a laser with a pitch and tolerance so as to be screw-connected to the nut portion (140).

[0045] Referring to FIGS. 1 and 2, a first coupling portion (112) may be provided at the lower portion of the ring portion (110), and a second coupling portion (122) may be provided at the upper portion of the bolt portion (120).

[0046] The first coupling portion (112) may be provided with a U-shaped groove, and the first coupling portion (112) may be coupled with the second coupling portion (122). The second coupling portion (122) may be provided with a U-shaped groove, and the groove provided in the first coupling portion (112) and the groove provided in the second coupling portion (122) may be fitted together to couple the ring portion (110) and the bolt portion (120).

[0047] Specifically, as shown in FIGS. 1 and 2, the first connecting portion (112) of the ring portion (110) and the second connecting portion (122) of the bolt portion (120) can be connected in a manner of intersecting in a cross (+) shape.

[0048] In this way, the first connecting portion (112) of the ring portion (110) and the second connecting portion (122) of the bolt portion (120) are connected in a cross (+) shape, thereby making it possible to firmly connect the ring portion (110) and the bolt portion (120).

[0049] According to an embodiment of the present invention, a metal bond may be used when the first coupling portion (112) and the second coupling portion (122) are coupled. In addition, when the first coupling portion (112) and the second coupling portion (122) are coupled, the first coupling portion (112) and the second coupling portion (122) may be coupled by welding.

[0050] In this way, as the first connecting portion (112) and the second connecting portion (122) are additionally connected through a metal bond or welding, the ring portion (110) and the bolt portion (120) can be firmly connected.

[0051] The ring portion (110) and the bolt portion (120) according to an embodiment of the present invention can be manufactured through laser processing, and the first connecting portion (112) of the ring portion (110) and the second connecting portion (122) of the bolt portion (120) can also be manufactured through laser processing.

[0052] Referring to FIGS. 3 and 4, the fixed part (130) is provided at the lower portion of the bolt part (120) and is fixed to the lower portion of the deck (10). The fixed part (130) may be provided at the lower portion of the bolt part (120), and the fixed part (130) may be manufactured integrally with the bolt part (120). However, the present invention is not limited thereto, and the fixed part (130) may be manufactured separately from the bolt part (120) and then coupled to the bolt part (120).

[0053] Referring to FIGS. 5 and 6, the fixing member (130) can be fixed to the lower part of the deck (10) by passing through the gap between one deck (10) and another deck (10).

[0054] Specifically, by passing the fixing member (130) through the gap between one deck (10) and another deck (10) and rotating the fixing member (130) as shown in FIG. 6, the fixing member (130) can be fixed to the lower part of the deck (10).

[0055] Referring to FIG. 5, a sawtooth portion (132) having a sawtooth shape may be provided on the outer side of the fixing portion (130) according to an embodiment of the present invention. When the fixing portion (130) is fixed to the lower portion of the deck (10), the sawtooth portion (132) may come into contact with the lower portion of the deck (10).

[0056] According to an embodiment of the present invention, by providing the gear portion (132) on the outer side of the fixed portion (130), the coefficient of friction between the lower part of the deck (10) and the fixed portion (130) can be increased. This can prevent the fixed portion (130) from being detached from the lower part of the deck (10).

[0057] Referring to FIG. 5, the fixing portion (130) may be formed in a tapered shape whose width increases from the top to the bottom. Specifically, when the fixing portion (130) is viewed from the front as shown in FIG. 5, the fixing portion (130) may be formed in a tapered shape whose width increases from the top to the bottom.

[0058] According to an embodiment of the present invention, since the fixing part (130) is formed in a tapered shape that becomes wider from the top to the bottom, an inclined surface (131) may be formed on both sides of the fixing part (130).

[0059] Referring to FIGS. 5 and 6, the gear portion (132) may be formed on the inclined surface (131) formed on both sides of the fixed portion (130). Specifically, the gear portion (132) formed in a gear shape may be provided on the inclined surface (131) of the fixed portion (130) formed in a tapered shape.

[0060] Referring to FIG. 6, when the fixed part (130) is fixed to the lower part of the deck (10), the toothed part (132) formed on the inclined surface (131) of the fixed part (130) can come into contact with the lower part of the deck (10).

[0061] According to an embodiment of the present invention, the side surface of the fixing member (130) may be formed with a constant width. Specifically, when the fixing member (130) is viewed from the side as shown in FIG. 4, the side surface width of the fixing member (130) may be formed with a constant width from top to bottom.

[0062] According to an embodiment of the present invention, the fixing member (130) may be installed at the lower part of the deck (10) by passing through a gap (gap) formed between the decks (10). When the fixing member (130) passes through the gap formed between the decks (10) and the decks (10), the fixing member (130) may be arranged in a direction parallel to the direction in which the gap formed between the decks (10) and the decks (10) extends.

[0063] By arranging the fixing member (130) in a direction parallel to the direction in which the gap formed between the decks (10) extends, the fixing member (130) can be passed through the gap formed between the decks (10).

[0064] Referring to Fig. 6, when the fixed part (130) is placed on the lower part of the deck (10) by passing through the gap formed between the decks (10), the fixed part (130) is rotated. When the fixed part (130) is rotated, the inclined surface (131) of the fixed part (130) formed in a tapered shape comes into contact with the lower part of the deck (10), so that the fixed part (130) can be fixed to the deck (10). At this time, the toothed part (132) formed on the inclined surface (131) of the fixed part (130) can come into contact with the lower part of the deck (10).

[0065] The bolt deck pack according to an embodiment of the present invention has an advantage in that the deck pack can be firmly installed on the lower part of the deck (10) even when the gap between the decks (10) is not constant, by fixing the deck pack to the lower part of the deck (10) through the tapered fixing member (130).

[0066] The gap between decks installed at campsites can vary from 3.0 to 10 mm. This irregularity can result in large gaps between decks, which can prevent the deck pack from being properly secured to the deck.

[0067] However, in the bolt deck pack according to the embodiment of the present invention, since the fixing portion (130) is formed in a tapered shape, even if the gap between the decks (10) widens, the fixing portion (130) can be brought into contact with the lower portion of the deck (10) through the inclined surface (131) and the toothed portion (132) of the fixing portion (130).

[0068] Through this, the bolt deck pack according to the embodiment of the present invention can firmly install the fixing part (130) on the lower part of the deck (10) even if the gap between the decks (10) is not constant.

[0069] In the above description, the fixing part (130) is described as having a tapered shape that becomes wider from the top to the bottom, but it is not limited thereto. The fixing part (130) according to an embodiment of the present invention may be formed in various shapes as long as it becomes wider from the top to the bottom. In this case, the toothed part (132) may be provided on both sides when the fixing part (130) is viewed from the front.

[0070] Referring to FIGS. 3 and 4, the nut portion (140) may be fitted into the bolt portion (120). The nut portion (140) may be screw-connected to the screw thread (121) of the bolt portion (120), and after the fixing portion (130) is fixed to the lower portion of the deck (10), the nut portion (140) may be fastened to the bolt portion (120).

[0071] Specifically, the nut portion (140) can secure the upper portion of the deck (10) by being screwed to the bolt portion (120) after the fixing portion (130) is fixed to the lower portion of the deck (10).

[0072] Referring to Fig. 6, by fastening the nut part (140) to the bolt part (120) and bringing the nut part (140) into contact with the upper part of the deck (10), the upper part of the deck (10) can be fixed through the nut part (140).

[0073] A bolt deck pack according to an embodiment of the present invention may further include a washer (150) inserted into the bolt portion (120). The washer (150) is provided with a hole that can be inserted into the bolt portion (120) and a wing portion extending outward. The washer (150) may be placed between the nut portion (140) and the deck (10).

[0074] According to an embodiment of the present invention, after the washer (150) is inserted into the bolt portion (120), the nut portion (140) can be fastened to the bolt portion (120). Specifically, after the fixing portion (130) is fixed to the lower portion of the deck (10), the washer (150) can be fitted into the bolt portion (120). After the washer (150) is fitted into the bolt portion (120), the nut portion (140) can be screw-coupled to the bolt portion (120).

[0075] According to an embodiment of the present invention, the washer (150) can secure the upper portion of the deck (10). Specifically, when the nut portion (140) is fastened to the bolt portion (120) and the nut portion (140) is brought into contact with the upper portion of the deck (10), the washer (150) can be brought into contact with the upper portion of the deck (10) as the washer (150) is placed between the nut portion (140) and the deck (10).

[0076] The above washer (150) can transmit the fastening force of the nut portion (140) to the upper portion of the deck (10) through the wing portion, thereby enabling the upper portion of the deck (10) to be fixed through the washer (150).

[0077] Referring to FIGS. 5 and 6, a lower groove (133) and an insertion portion (134) may be provided at the lower portion of the fixing portion (130) according to an embodiment of the present invention. The lower groove (133) may be a groove dug inward from the lower portion of the fixing portion (130), and the insertion portion (134) may be provided on the side of the lower groove (133) and protrude outward.

[0078] When the fixing part (130) is provided with the lower groove (133) and the insertion part (134), the fixing part (130) can be easily inserted into the gap between the decks (10) and the decks (10). Specifically, when the fixing part (130) is inserted into the gap between the decks (10) and the decks (10), the insertion part (134) having a small area can be inserted first, and then the lower groove (133) can be inserted.

[0079] In this way, when inserting the fixing part (130) into the gap between decks (10) and decks (10), the inserting part (134) having a small area is inserted first, so that the fixing part (130) can be easily inserted into the gap between decks (10) and decks (10).

[0080] Referring to FIG. 7(a) and FIG. 7(b), the nut portion (140) according to an embodiment of the present invention may be formed of a connecting member (160) in which a nut and a washer are manufactured as one piece. The connecting member (160) is a nut and a washer manufactured as one piece, and the connecting member (160) may be screw-connected to the bolt portion (120).

[0081] Referring to Fig. 7(b), a screw groove that can be coupled to the screw thread (121) of the bolt portion (120) may be provided inside the connecting member (160). Referring to Fig. 8, the connecting member (160) can be screw-coupled to the bolt portion (120) through the screw groove provided inside the connecting member (160) and the screw thread (121) of the bolt portion (120). The connecting member (160) according to an embodiment of the present invention may be made of plastic or a metal material (aluminum, etc.).

[0082] Referring to FIG. 7(a) and FIG. 7(b), the connecting member (160) may include a handle portion (161) and a washer portion (162). The handle portion (161) may be a portion that a user can grip, and the handle portion (161) may be provided on the upper portion of the connecting member (160).

[0083] The above washer portion (162) is provided at the lower portion of the handle portion (161) and is in contact with the deck (10) to fix the upper portion of the deck (10). As shown in Fig. 8, when the connecting member (160) is screwed into the bolt portion (120), the washer portion (162) comes into contact with the deck (10) to fix the upper portion of the deck (10).

[0084] According to an embodiment of the present invention, the handle portion (161) may be provided with a plurality of anti-slip grooves (163). Specifically, the handle portion (161) may be subjected to an anti-slip knurling process, through which a plurality of anti-slip grooves (163) may be formed in the handle portion (161).

[0085] The user can grip the handle portion (161) with his or her fingers to screw the connecting member (160) onto the bolt portion (120). At this time, the anti-slip groove (163) provided in the handle portion (161) prevents the handle portion (161) from slipping off the user's fingers.

[0086] The bolt deck pack according to the embodiment of the present invention described above has the following effects.

[0087] A bolt deck pack according to an embodiment of the present invention has the advantage of being able to secure the deck pack at the upper part of the deck through a bolt and nut fastening method, and to secure the deck pack at the lower part of the deck through a tapered fixing part having a sawtooth part.

[0088] In addition, the bolt deck pack according to the embodiment of the present invention described above has the advantage of being able to firmly fix the deck pack to the deck regardless of the thickness of the deck by fixing the deck pack to the deck through a bolt and nut fastening method.

[0089] In addition, the bolt deck pack according to the embodiment of the present invention described above can increase the coefficient of friction between the lower part of the deck and the deck pack through a tapered fixing part having a sawtooth part, thereby having the advantage of preventing the deck pack from coming off the deck.

[0090] In addition, the bolt deck pack according to the embodiment of the present invention described above has the advantage of being able to firmly install the fixing part on the lower part of the deck even when the gap between decks is not constant, as the deck pack is fixed to the lower part of the deck through a tapered fixing part having a sawtooth part.

[0091] In addition, the bolt deck pack according to the embodiment of the present invention described above has the advantage of being able to stably hold a tent line even in a strong wind by fixing the deck pack at the upper part of the deck through a fastening method of bolts and nuts and fixing the deck pack at the lower part of the deck through a tapered fixing part having a sawtooth part.

[0092] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and variations of the embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. In the deck pack fixed to the deck, A ring portion having a ring-shaped ring; A bolt part provided at the lower part of the above-mentioned ring part, extending in the height direction, and having a screw thread on the outer surface; A fixing part provided at the lower part of the above bolt part and fixed to the lower part of the deck; It includes a nut part fitted into the above bolt part; A bolt deck pack characterized in that the above-mentioned fixed part is fixed to the lower part of the deck by passing through a gap formed between the decks.

2. In paragraph 1, A bolt deck pack characterized in that the nut portion fixes the upper portion of the deck by being screwed to the bolt portion after the fixing portion is fixed to the lower portion of the deck.

3. In paragraph 2, It further includes a washer inserted into the above bolt portion, After the washer is inserted into the bolt portion, the nut portion is fastened to the bolt portion, A bolt deck pack characterized in that the above washer secures the upper portion of the deck.

4. In paragraph 1, The outer side of the above fixed part is provided with a sawtooth part in the shape of a saw tooth. A bolt deck pack characterized in that the above-mentioned gear portion comes into contact with the lower portion of the deck.

5. In paragraph 1, The above fixed part is formed in a tapered shape that becomes wider from the top to the bottom. The inclined surface of the above fixed part having a tapered shape is provided with a sawtooth portion having a sawtooth shape. A bolt deck pack characterized in that the above-mentioned gear portion comes into contact with the lower portion of the deck.

6. In paragraph 1, A bolt deck pack characterized in that the above nut portion is formed of a connecting member in which the nut and the washer are manufactured as one piece.

7. In paragraph 6, The above-mentioned joining member is, It includes a handle portion that can be gripped by a user, and a washer portion that is provided on the lower portion of the handle portion and comes into contact with the deck to fix the upper portion of the deck. A bolt deck pack characterized in that the handle portion is provided with a plurality of anti-slip grooves.

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