JP3666614B2 - Radial tire repair method and repair tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a repair method and a repair tool when a side portion, a tread surface, and a shoulder surface of a radial tire (including both a tube type and a tubeless type) are damaged.
[0002]
[Prior art]
In radial tires, the tire cords that make up part of the carcass are buried radially with respect to the center of the tire, so if the side cords are damaged and the tire cords are cut there, the strength of those parts becomes extremely high. descend. Even if the damaged part is closed in such a state, the strength is insufficient, so that the repaired part is expanded by air pressure. For this reason, conventionally, a large cloth is pasted on the inner surface of the radial tire to reinforce the loss of the tire cord, and then the damaged portion is closed.
[0003]
[Problems to be solved by the invention]
As described above, the work of applying the cloth to the inner surface of the radial tire takes time because it is necessary to first remove the tire from the vehicle body and then to remove the rim, and a highly skilled technique is required. Therefore, high cost and time are required for repairing, and this is a factor that facilitates easy replacement. In recent years, disposal of waste tires has become a major social problem, one of which is the delay in repairing radial tires.
[0004]
The present invention has been made in view of the above, and an object of the present invention is to provide a repair method and a repair tool that can easily and reliably repair a radial tire.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes a step of forming a through-hole through a damaged portion of a radial tire, and a tapered side and a rear side formed in a cone shape or a frustum shape larger than the through-hole. A step of forcibly inserting a plug member formed of a skirt portion and a connecting member surrounding the periphery into the radial tire from the through hole, and a locking member arranged outside the through hole as the connecting member of the plug member And a method of repairing a radial tire comprising: engaging and locking the lock member to a meat portion around a through-hole, and closely contacting a skirt portion of a plug member to an inner surface of the meat portion around the through-hole. .
[0006]
Desirably, a circular recess having a depth that does not damage the tire cord in the radial tire is formed on the outer periphery of the through hole, and a lock member is inserted into the circular recess.
[0007]
Further, a plug member comprising a tapered cone-shaped or frustum-shaped main body portion, a connecting member projecting on the rear side of the main body portion, and a skirt portion formed on the rear periphery of the main body portion, and a connecting member for the plug member And a locking member provided with an engaging portion that engages with the inner surface of the through hole formed by piercing the damaged portion of the radial tire, and the skirt portion of the plug member is closely attached to the inner surface of the through hole A radial tire repair tool is provided in which the connecting member of the plug member and the engaging portion of the lock member are engaged with each other and the lock member is fixed to the meat portion around the through hole.
[0008]
The plug member is forcibly inserted from the through hole and the connecting member is held so that the plug member does not fall into the radial tire. Then, if the locking member is engaged with the connecting member to connect the plug member and the locking member, and the lock member is fixed to the outer surface of the meat portion around the through hole by means such as sticking, the skirt portion of the plug member penetrates. There is no need to reinforce the inside of the radial tire with a cloth since the lock member compensates for the loss of the tire cord by tightly adhering to the inner surface of the meat part around the hole.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments 1 to 3 of the present invention will be described below with reference to FIGS.
[0010]
Embodiment 1
1 to 7 show the first embodiment. FIG. 1 is an exploded perspective view showing a repair tool in a half cross section, FIG. 2 is a front view of a lock member, and FIGS. 3 to 7 are main parts showing a repair process. FIG.
[0011]
A repair tool 1A for a radial tire (hereinafter simply referred to as a tire) W is a combination of a plug member 2 that closes a damaged portion P of the tire W from the inside and a lock member 3 that closes the damaged portion P from the outside. The plug member 2 includes a rubber main body 2a and a synthetic resin connecting member 2b. The main body 2a of the plug member 2 has a tapered conical shape and is provided with a mortar-shaped recess 4 on the rear side, and a shallow skirt 5 is formed on the periphery of the rear end. On the other hand, the connecting member 2b of the plug member 2 is an integral structure of a head portion 6 having a trapezoidal cross section and a belt portion 8 in which a large number of square engaging holes 7, 7. The connecting member 2b is integrated with the trapezoidal head 6 by embedding it in the main body 2a, and protrudes long on the rear side of the main body 2a.
[0012]
The lock member 3 is made of rubber, and has a circular substrate 3a having a diameter substantially the same as the outer diameter of the rear end of the main body 2a of the plug member 2, and a front end of the circular substrate 3a having a conical tip. It consists of a certain projection 3b. A rectangular belt hole 3c is formed in the lock member 3 so as to penetrate the center, and a one-way stopper 3d is inserted in the middle of the belt hole 3c. This one-way stopper 3d has serrated engaging portions 9, 9 protruding at two locations, an inlet and an outlet. The one-way stopper 3d is engaged once with the engaging hole 7 of the connecting member 2b of the plug member 2. There is a function of preventing the connecting member 2b from moving backward. Further, on the front side of the circular substrate 3a of the lock member 3, there is a sword-mount engaging portion 10 formed by inserting a number of short needles 10a in a region S surrounded by a two-dot chain line in FIG. Preferably, as shown in FIG. 2, it is better not to provide the engaging portion 10 on the horizontal line passing through the center of the circular substrate 3a. By doing so, the circular substrate 3a is easily bent and easily follows the movement of the tire W. Further, as shown by a two-dot chain line in FIG. 6, a large number of reinforcing cords 11 such as piano wires and fibers may be arranged in parallel on the circular substrate 3a so as to improve the strength.
[0013]
Next, a method for repairing the tire W using the repair tool 1A will be described. First, as shown in FIG. 3, the through hole 12 is formed by penetrating the damaged portion P of the tire W in a circular shape. Further, a circular recess 14 having a depth that does not damage the tire cord 13 in the tire W is formed on the outer periphery of the through hole 12.
[0014]
Next, after applying an adhesive to the outer surface of the main body 2a of the plug member 2 and the skirt 5 at the rear periphery, the main body 2a is forced into the through-hole 12 as shown in FIG. 4 while holding the connecting member 2b by hand. insert. At this time, since the adhesive functions as a lubricating oil in addition to the elasticity of the main body 2a itself and the elasticity of the tire W, the main body 2a passes through the through-hole 12 and enters the tire W relatively smoothly and spreads at the same time. Return to the original shape. And when the main-body part 2a passes through the through-hole 12, the adhesive applied to the outer surface almost adheres to the through-hole 12 side by contact with the through-hole 12, and further, a part of the adhesive is part of the main-body part 2a. It is placed on the skirt portion 5 on the rear periphery. When the connecting member 2b is pulled toward the outside of the tire W in this state, the skirt portion 5 of the main body portion 2a comes into close contact with the inner surface of the tire W as shown in FIG. 5 and completely closes the through hole 12 from the inside.
[0015]
Next, an adhesive is applied onto the protrusion 3b of the lock member 3 and the engaging portion 10 of the circular substrate 3a (the surface excluding the horizontal line passing through the center of the circular substrate 3a), and the belt as shown in FIG. The connecting member 2b (belt portion 8) of the plug member 2 is passed through the hole 3c. Then, the end of the connecting member 2 b is held, the lock member 3 is slid toward the through hole 12, and the protrusion 3 b is fitted into the recess 4 of the plug member 2. At this time, the belt portion 8 of the connecting member 2b advances while forcibly deforming the engaging portions 9 and 9 of the one-way stopper 3d of the lock member 3 and its periphery. With the protrusion 3b of the lock member 3 fitted in the recess 4 of the plug member 2, the connecting member 2b is pulled one more strongly, and as shown in FIG. 6, the meat portion around the through-hole 12 by the plug member 2 and the lock member 3 15 is sandwiched. At the same time, the engaging portion 10 of the circular substrate 3 a is pierced into the meat portion 15. Since the locking member 3 is prevented from moving backward by the engagement of the engaging portions 9 and 9 of the one-way stopper 3d and the engaging hole 7 of the connecting member 2b, the coupling with the plug member 2 is not loosened.
[0016]
Finally, as shown in FIG. 7, the protruding portion of the connecting member 2 b is cut, and if necessary, a cosmetic cap seal 16 is adhered to close the circular recess 14. When the adhesive applied to the plug member 2 and the lock member 3 is solidified, the skirt portion 5 of the plug member 2 is brought into close contact with the inner surface of the meat portion 15 around the through hole 12 to prevent air leakage and the lock member 3 The defect of the tire cord 13 is compensated.
[0017]
The cap seal 16 described above is entirely made of rubber, and as shown in FIG. 7, a suction cup ring 16b having the same function as the skirt portion 5 is formed around the circular lid plate 16a, and the suction cup ring 16b is perforated. A water drain or air vent hole (not shown) is formed, and an adhesive is applied to a portion other than a horizontal line passing through the center to adhere to the tire W. Since the non-adhesive portion becomes stretchable, the deformation of the tire W generated during traveling is absorbed there, and therefore the cap seal 16 is not peeled indefinitely. The cap seal 16 may be the same color as the tire W, but it is preferable to apply an appropriate picture or pattern on the surface as desired. By doing so, the place where the tire W is repaired becomes a fashion accent, and the younger generation's resistance to using the repaired tire W is almost eliminated. Of course, the cap seal 16 can be used alone as a decorative seal anywhere other than the tread surface of the tire W.
[0018]
As mentioned above, although this invention was demonstrated about Embodiment 1, of course, this invention is not limited to the said Embodiment 1. FIG. For example, in the first embodiment, most of the plug member 2 and the lock member 3 are made of rubber, but may be made of synthetic resin or metal. Further, the connecting member 2b is not limited to a belt-shaped member, and may be formed in a form in which a male screw is cut on a shaft such as a bolt. In this case, the engaging portion of the lock member 3 is formed as a female screw like a nut, and after both are screwed together, an appropriate loosening prevention process is applied to the connecting member 2b.
[0019]
Further, when the connecting member 2b has a synthetic resin belt structure as in the first embodiment, it may be reinforced by inserting a piano wire or fiber therein if necessary. Furthermore, the engaging portion 10 is formed for the purpose of further strengthening the coupling between the lock member 3 and the meat portion 15, and a large number of ridges are formed on the front surface of the circular substrate 3a without inserting the needle 10a. To improve the coupling with the meat portion 15 or to form a groove on the peripheral edge of the through-hole 12 and to fit the convex groove on the circular substrate 3a. Also good. Further, in Embodiment 1 and Embodiment 2 described later, the circular recess 14 is formed in the through hole 12, but instead of such a stepped hole structure, a tapered hole structure having a small diameter from the outside to the inside. It may be. In this case, the lock member 3 is fitted into the tapered hole. Such a tapered hole can be easily machined with an existing tool, so that it is easier to implement. Furthermore, as the adhesive applied to the plug member 2, a grease type non-curing type may be used. By doing so, the plug member 2 can easily follow the deformation of the tire W, and the airtight holding performance is enhanced.
[0020]
Embodiment 2
8 and 9 show the repair tool 1B for the tire W according to the second embodiment. FIG. 8 is an exploded perspective view showing the repair tool in a half cross section, and FIG. 9 shows the use state of the repair tool 1B. It is sectional drawing of a part. In FIGS. 8 and 9, the same reference numerals as those in FIGS. 1 to 7 are the same as those of the repair tool 1 </ b> A.
[0021]
In the repair tool 1B of the second embodiment, a Ω-shaped metal fitting 2c is embedded in the main body 2a of the plug member 2 integrally with a reinforcing reinforced plastic plate 2d. Are connected in a radial fashion. Further, a resilient groove 2e is formed at the tip of the main body 2a, and it is easy to bend following the deformation of the tire W during running or puncturing. Further, when the main body portion 2a bends following the tire W, the arched portion of the hanging metal fitting 2c also responds flexibly by the spring action. Although not shown, it is preferable to insert a piano wire in the main body 2a of the plug member 2 in a state like an umbrella bone. By doing so, it is easy to deform | transform when the main-body part 2a passes the through-hole 12, and the rigidity at the time of pulling the center back surface of the main-body part 2a with connection member 2b, 2b ... increases.
[0022]
On the other hand, the lock member 3 is obtained by inserting two sets of synthetic resin meniscus plates 3e and 3e and ring-shaped piano wires 3f and 3f into a circular substrate 3a. The meniscuses 3e and 3e are a set of two, and are embedded in the circular substrate 3a with an interval in the vertical direction, and the meniscuses 3e and 3e are connected by the piano wires 3f and 3f. Further, a rectangular belt hole 3c through which the connecting member 2b passes is formed in the circular substrate 3a, and a one-way stopper 3d is formed in the meniscus plates 3e and 3e.
[0023]
Thus, the repair tool 1B of the second embodiment, like the repair tool 1A, first applies the adhesive to the plug member 2a and passes it through the through hole 12, and then passes the lock member 3 through the connecting member 2b to the meniscus 3e, Only the portion corresponding to 3e is bonded to the outer surface of the meat portion 15 around the through hole 12. In the repair tool 1B thus attached to the tire W, the skirt portion 5 of the plug member 2a is in close contact with the inner surface of the meat portion 15 around the through hole 12 to prevent air leakage, and the lock member 3 prevents the tire cord 13 from being damaged. compensate. Further, since the lock member 3 has a gap between the meniscuses 3e and 3e and the portion bends flexibly, the lock member 3 can follow the movement of the tire W. In addition, between the meniscus 3e and 3e, it can oppose the force of a tension | pulling direction with the piano wires 3f and 3f.
[0024]
Embodiment 3
10 to 13 show a repair tool 1C for a tire W according to Embodiment 3, in which FIG. 10 is an exploded perspective view showing the repair tool in a half section, and FIG. 11 is a cross-sectional view showing a use state of the repair tool. 12 (a) to 12 (c) are cross-sectional views of the main part showing the repair process, and FIG. 13 is a cross-sectional view of the main part showing the fitting structure. 10-13, the part which attached | subjected the same code | symbol as FIGS. 1-9 is the same as repair tool 1A, 1B.
[0025]
The repair tool 1C of the third embodiment is characterized in that the lock member 3 is clamped. As shown in FIG. 10, the lock member 3 is a combination of an inner member 30, an outer member 31, and a receiving member 32. The receiving member 32 is made of synthetic resin or metal, and has a concave groove 32a that holds the edge of the through-hole 12 in the front surface of the wedge-shaped main body portion, and the inner member 30 and the outer member 31 on the upper and lower surfaces of the main body portion. It has the engaging groove 32b to engage. Further, a through hole 32c for inserting a screw shaft 30b of the inner member 30 described later is formed in the main body portion of the receiving member 32.
[0026]
On the other hand, the inner member 30 and the outer member 31 are made of metal and have a pair of clamp bodies 30a, 30a, 31a, 31a and a pair of clamp bodies 30a, 30a (31a, 31a) in a half moon shape in plan view. It consists of reinforcement cords 11, 11. The reinforcing cord 11 includes a linear shape extending in a direction parallel to the tire cord 13 and a circular ring shape fitted in the cord grooves 33 of the clamp bodies 30a and 31a. The clamp bodies 30a, 30a, 31a, and 31a are provided with ribs 34 that are engaged with the engaging grooves 32b of the receiving member 32 at the rear edge. A large number of sawtooth-shaped ridges are formed on the engaging portion 10 (the portion in contact with the meat portion 15 of the tire W) of the clamp body 30a. Of course, as described in the first embodiment, a number of short needles 10a may protrude from the engaging portion 10.
[0027]
A plurality of screw shafts 30b are fixedly planted in the clamp bodies 30a and 30a of the inner member 30 toward the outer member 31, and a plurality of belt holes 3c are formed between the screw shafts 30b. It is installed. Further, an elastic cover body 30c is integrally fixed to the clamp body 30a of the inner member 30 for the purpose of protecting the plug member 2 and the tire W from the metal edge. The elastic cover body 30c can alleviate fatigue of the meat portion 15 (particularly the portion corresponding to the end of the clamp body 30a) due to the intense movement of the tire W. Further, the elastic cover body 30 c also functions to improve the coupling between the plug member 2 and the inner member 30.
[0028]
On the other hand, the clamp body 31a of the outer member 31 is provided with a plurality of screw holes 31b for passing the screw shaft 30b of the inner member 30 and a plurality of belt holes 3c. An elastic cover body 31c is fixed to the edge of the clamp body 31a for the same purpose as that of the inner member 30.
[0029]
The plug member 2 used in Embodiment 3 has a frustoconical appearance and has a recess 20 on the side facing the center of the tire W, and the elastic groove 2e is formed in the recess 20. This recess 20 makes it easy to receive the air pressure of the tire W, thereby fulfilling the function of bringing the main body 2a into close contact with the tire W. Further, a connecting member 2b made of synthetic resin is inserted into the plug member 2, and a plurality of belt portions 8, 8... Protrude upward. Needless to say, it is desirable that the belt portions 8, 8. This is because the plug member 2 can be brought into close contact with the inner surface of the tire W with equal force.
[0030]
In addition, a reference numeral 50 in FIG. 10 is a through groove formed in the receiving member 32 and the plug member 2 for allowing the reinforcing cord 11 to pass therethrough. Reference numeral 54 denotes an auxiliary member in which the belt hole 3c for the connecting member 2b is provided in the circular ring-shaped reinforcing cord 11 of the inner member 30.
[0031]
Thus, the repair tool 1C has a through hole 12 and a circular recess 14 formed in the damaged portion P of the tire W as shown in FIG. 12A, and the plug member 2 is rolled through in the direction indicated by the arrow Y in FIG. The inner member 30 is inserted through the through-hole 12 as shown in FIG. The inner member 30 has a structure in which two clamp bodies 30a, 30a are connected by the reinforcing cord 11, and the inner member 30 can be freely bent at the portion of the reinforcing cord 11, so that the through-hole 12 can be easily passed. Next, the receiving member 32 is fitted to the edge of the through hole 12, and the screw shaft 30 b of the inner member 30 is passed through the through hole 32 c of the receiving member 32. Then, as shown in FIG. 12C, the outer member 31 is placed on the receiving member 32, the screw shaft 30 b of the inner member 30 is passed through the screw hole 31 b of the outer member 31, and tightened with the nut 51. By this tightening, the inner member 30 and the outer member 31 come into contact with the receiving member 32, and the ribs 34 of both the members 30 and 31 are fitted into the engaging grooves 32 b of the receiving member 32. When the nut 51 is further tightened, the rib 34 serves as a fulcrum, and the engaging portion 10 of the clamp body 30a ... bites into the meat portion 15.
[0032]
In addition, as shown in the enlarged view Z in FIG. 11, the return pieces 52 are formed on all the clamp bodies 30 a... Toward the concave groove 32 a side of the receiving member 32. The combination of the return piece 52 and the groove 32a has the following significance. That is, when the meat portion 15 is compressed by tightening the nut 51, the reaction causes the edge of the meat portion 15 to expand between the recessed groove 32a of the receiving member 32 and the return piece 52. Accordingly, since the meat portion 15 is in a state of biting into the return piece 52 of the clamp body 30a, the fixation is further strengthened. Further, since the water tightness of the edge of the through hole 12 is remarkably improved, water does not enter the thread hole of the tire cord 13 from the damaged portion of the tire W. Therefore, the effect excellent in prevention of the burst accident resulting from such invasion of water, what is called a separation accident, is exhibited.
[0033]
Next, after injecting a grease-type non-curing adhesive into the concave portion of the plug member 2 that fits into the elastic cover body 30c, the connecting member 2b is connected to the inner member 30, the receiving member 32, the outer member 31, and The plug member 2 is pulled up toward the inner surface of the tire W through the belt holes 3 c of the auxiliary member 54. If it does so, the said adhesive will overflow from a dent and will spread to the part of the skirt part 5, the plug member 2 will closely_contact | adhere to the inner surface of the tire W, and airtightness will be maintained. Note that the plug member 2 and the lock member 3 are more firmly coupled by adopting a serrated fitting structure as shown in FIG. 13 at the joint between the elastic cover body 30c of the inner member 30 and the plug member 2. it can.
[0034]
Finally, excess portions of the screw shaft 30b and the belt portion 8 of the connecting member 2b are cut off, and the cap seal 16 with the sucker ring 16b is attached to the circular recess 14. A fitting structure as shown in FIG. 13 is adopted at a joint portion (see symbols S and T in FIG. 11) between the cap seal 16 and the outer member 31. A wave 53 corresponding to the elastic groove 2e of the plug member 2 is formed on the cover plate 16a of the cap seal 16 so that the tire W can easily follow the deformation. Further, unlike the first embodiment, the cap seal 16 is applied to the tire W by applying an adhesive to the entire circumference. Even in such a case, when the tire W is deformed, the adhesive at the bent portion is naturally peeled off. Further, the cap seal 16 used for the tread surface and the shoulder surface of the tire W is formed such that a male screw is formed at a portion S in FIG. 11 of the outer member 31 and is screwed to the male screw, and further the tread surface. It is preferable to cut off a portion protruding from the shoulder surface and to make it flush with the tread surface.
[0035]
By the way, the thickness of the flesh portion 15 around the through hole 12 differs depending on whether the damaged portion is a tread surface or a side portion. However, the repair tool 1 </ b> C of the third embodiment can cope with the difference in the thickness of the meat portion 15 by simply replacing the receiving member 32. Therefore, the inner member 30 and the outer member 31 can be used as they are as common parts, which is effective as a cost reduction measure.
[0036]
【The invention's effect】
As described above, according to the present invention, the skirt portion of the plug member is in close contact with the inner surface of the meat portion around the through hole to prevent air leakage, and the lock member compensates for the loss of the tire cord. There is no need to do. Therefore, the work of sticking a cloth on the inner surface of the tire to reinforce the loss of the tire cord is completely unnecessary. As in the prior art, first, the tire is first removed from the vehicle body, and then the rim is removed. No troublesome work is required, the tires can be repaired while attached to the car body, and no special skills are required, so part-time employees can repair tires quickly and reliably. effective. As a result, the time and cost for repair are drastically improved, so that the easy replacement tendency of tires is corrected and the generation amount of waste tires is reduced, which contributes to the disposal problem of waste tires.
[0037]
In addition, by forming a circular recess with a depth that does not damage the tire cord in the tire on the outer periphery of the through hole, the lock member is flush with the side of the tire and does not interfere with the appearance. There is an effect that makes it less noticeable.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a repair tool in a half cross section.
FIG. 2 is a front view of a lock member.
FIG. 3 is a cross-sectional view of a main part showing a repair process.
FIG. 4 is a cross-sectional view of a main part showing a repair process.
FIG. 5 is a cross-sectional view of a main part showing a repair process.
FIG. 6 is a cross-sectional view of a main part showing a repair process.
FIG. 7 is a cross-sectional view of a main part showing a repair process.
FIG. 8 is an exploded perspective view showing the repair tool of Embodiment 2 in a half section.
FIG. 9 is a cross-sectional view of a main part showing a use state of the repair tool of the second embodiment.
FIG. 10 is an exploded perspective view showing the repair tool of Embodiment 3 in a half section.
FIG. 11 is a cross-sectional view of a main part showing a use state of the repair tool of Embodiment 3.
FIGS. 12A to 12C are cross-sectional views of main parts showing a repair process according to the third embodiment.
FIG. 13 is a cross-sectional view of a main part showing a fitting structure.
[Explanation of symbols]
W ... Radial tire P ... Damaged part 1A, 1B, 1C ... Repair tool 2 ... Plug member 2a ... Main body 2b ... Connection member 3 ... Lock member 5 ... Skirt part 9 ... Engagement part 12 ... Through hole 13 ... Tire cord 14 ... Circular recess 15 ... Meat part

Claims (3)

Forming a through hole through a damaged portion of the radial tire;
A plug member, which is tapered and has a rear side larger than the through hole in the shape of a cone or a frustum, and a rear side skirt portion and a connecting member is forced into the radial tire from the through hole. Inserting, and
A lock member disposed outside the through hole is engaged with the connecting member of the plug member, and the lock member is fixed to the meat portion around the through hole, and the skirt portion of the plug member is fixed to the meat portion around the through hole. A process of adhering to the inner surface;
A radial tire repairing method comprising: 2. The radial tire according to claim 1, wherein a circular recess having a depth that does not damage a tire cord in the radial tire is formed on an outer periphery of the through hole, and a lock member is inserted into the circular recess. Repair method. A plug member comprising a tapered cone-shaped or frustum-shaped main body, a connecting member projecting on the rear side of the main body, and a skirt formed on the rear edge of the main body;
A locking member provided with an engaging portion that engages with the connecting member of the plug member,
The skirt portion of the plug member is brought into close contact with the inner surface of the through hole made by piercing the damaged portion of the radial tire, and the lock member is disposed outside the through hole, and the connecting member of the plug member and the engaging portion of the lock member are arranged. A repair tool for a radial tire, wherein the lock member is engaged and fixed to a meat portion around a through hole.

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