Endless rubber track and joint for endless track

Abstract

The present invention relates to an endless rubber track and a joint for an endless track. According to the present invention, a wire segment of a joint and a rubber segment of a rubber part can form one single track, and single tracks may be connected to each other through a connector so as to form an endless track. When the present invention is applied, there is an advantage in that the internal force and resource utilization rate of the endless rubber track are improved.

Description

Crawler rubber tracks and track joints

[0001] The present invention relates to caterpillar tracks, and more particularly to caterpillar rubber tracks.

[0002] The caterpillar track is constructed as a closed ring structure.

[0003] The caterpillar tracks have a large surface area in contact with the ground, ensuring stable and free driving of the vehicle even on uneven or steep ground, or on muddy ground.

[0004] Infinite tracks can be widely used in military vehicles (such as tanks and armored vehicles), heavy equipment vehicles (such as excavators and bulldozers), and agricultural work vehicles (such as combines and tractors).

[0005] Figure 1 is a schematic diagram of a typical caterpillar track (CA).

[0006] In FIG. 1 and below, the X-axis is the direction in which the caterpillar track (CT) moves circularly when the vehicle moves forward or backward, the Y-axis is the width direction of the caterpillar track (CT) while being orthogonal to the X-axis, and the Z-axis is defined as a direction orthogonal to both the X-axis and the Y-axis.

[0007] The caterpillar track (CA) consists of a caterpillar track (CT), a driving sprocket (DS), a driven roller (PR), and a number of driving wheels (TW).

[0008] The caterpillar track (CT) is arranged to surround the driving sprocket (DS), the driven roller (PR), and a number of driving wheels (TW) on the inside.

[0009] The caterpillar track (CT) is installed to mesh with the drive sprocket (DS) located on the inside. When the drive sprocket (DS) is rotated by the engine, the caterpillar track (CT) moves cyclically in the X-axis direction, thereby allowing the vehicle to move forward or backward.

[0010] There are two types of tracked vehicles (CT): tracked railways and tracked rubber tracks.

[0011] The track is a ring structure in which metal bodies are connected by metal links, and because it has high strength, it is installed on relatively heavy vehicles.

[0012] Rubber tracks are made of a rubber coating on a ring-shaped wire. Because they have lower strength than steel tracks, they are installed on relatively lightweight vehicles. However, rubber tracks offer superior maneuverability, fuel efficiency, and ride comfort.

[0013] Referring to FIGS. 2 and 3, a conventional endless rubber track (100) is schematically examined.

[0014] Figure 2 is a cross-sectional view of an infinite rubber track (100) cut along the XZ plane and viewed in the Y-axis direction.

[0015] Figure 3 is a cross-sectional view of an infinite rubber track (100) cut along the YZ plane and viewed in the X-axis direction.

[0016] The endless rubber track (100) can be divided into a ring part (110) and a rubber part (120).

[0017] The ring portion (110) has a structure in which metal wires (W) with excellent tensile strength are arranged in a parallel and repeated manner in the Y-axis direction.

[0018] The wire (W) functions as a basic framework forming the ring structure of the endless rubber track (100).

[0019] The wire (W) increases the strength of the endless rubber track (100) and supports the tension generated in the X-axis direction along the circular movement trajectory of the endless rubber track (100).

[0020] The wire (W) also has the function of firmly maintaining the power transmission structure between the drive sprocket (DS) and the endless rubber track (100) by holding the position of the rubber part (120).

[0021] In a conventional endless rubber track (100), a wire (W) is arranged to extend long in the X-axis direction, and wraps the entire trajectory drawn by the endless rubber track (100) in a ring shape. Therefore, the conventional endless rubber track (100) has the following problems.

[0022] First, productivity is low because a large-scale production equipment proportional to the size of the infinite rubber track (100) is required.

[0023] Second, when mounting and dismounting the vehicle, the size of the endless rubber track (100) makes the mounting and dismounting process difficult and time-consuming.

[0024] Third, if a part of the infinite rubber track (100) is damaged, the entire track must be replaced, which increases maintenance costs and is not economical.

[0025] Meanwhile, research is being actively conducted recently on a technology that can be applied to relatively heavy vehicles due to its high strength while maintaining the advantages of an endless rubber track (100).

[0026] [Prior Art Literature]

[0027] [Patent Document]

[0028] (Patent Document 1) Republic of Korea Publication No. 10-2018-0014503

[0029] The present invention was conceived from the following considerations in order to obtain additional advantages while maintaining the advantages of an endless rubber track.

[0030] First, we need technology that can reduce the size of production equipment.

[0031] Second, it needs to be easy to remove.

[0032] Third, a technology is needed that can simply repair only the damaged area.

[0033] Fourth, there is a need to increase the strength to withstand relatively heavy vehicles.

[0034] An endless rubber track according to a first aspect of the present invention comprises: a ring portion forming a closed ring; and a rubber portion formed with a structure surrounding the ring portion, in contact with the ground, and made of a rubber material; wherein the rubber portion has a plurality of rubber segments that are segmented from each other and arranged continuously adjacent to each other.

[0035] The above-mentioned ring portion includes a plurality of wire segments made of metal wire; and a plurality of joints that complete a closed ring by connecting the wire segments.

[0036] The above rubber joints and the above wire joints correspond one-to-one, and the above rubber joints wrap around the corresponding wire joints so that the above rubber joints and the above wire joints form an integral unit track, and when the joint is disassembled, the above unit track connected to the joint can be dismantled.

[0037] An endless rubber track according to a second aspect of the present invention comprises: a ring portion forming a closed ring; and a rubber portion formed in a structure that surrounds the ring portion, comes into contact with the ground, and is made of a rubber material; wherein the ring portion comprises a plurality of wire segments formed of metal wire; and a plurality of joints that complete a closed ring by connecting the wire segments.

[0038] The above wire segments have a region having a two-layer arrangement structure in a direction orthogonal to the circular movement direction and the width direction.

[0039] At least some of the above plurality of joints have guides for guiding circular movement.

[0040] The above joint comprises a pair of bodies arranged adjacent to each other; and a connector for connecting the pair of bodies; wherein each of the pair of bodies has a gripping portion for gripping the wire segment.

[0041] An endless rubber track according to a third aspect of the present invention comprises: a ring portion forming a closed ring; and a rubber portion formed with a structure surrounding the ring portion, coming into contact with the ground, and made of a rubber material; wherein the ring portion includes a wire having a region having a two-layer arrangement structure in a direction orthogonal to the circular movement direction and the width direction.

[0042] A joint for an infinite track according to the present invention comprises a pair of bodies arranged adjacent to each other; and a connector for connecting the pair of bodies; wherein each of the pair of bodies comprises a connecting portion for connecting to an adjacent body by the connector; a gripping portion spaced apart from the connecting portion for gripping a material to be gripped; and a coupling portion for coupling the gripping portion to the connecting portion; wherein the pair of bodies can be connected to or disconnected from each other by the connector.

[0043] The above-mentioned portion has an arc shape in the cross-section in the area facing the above-mentioned connecting portion.

[0044] The above-mentioned connecting portion is provided as a pair spaced apart from each other, and a grip hole is formed by the connecting portion, the grip portion, and the connecting portion provided as a pair, and a part of the material to be gripped is placed on the grip hole, so that the material to be gripped is gripped by the grip portion.

[0045] The above pair of bodies can have their installation angles adjusted relative to each other.

[0046] According to the present invention, the following effects are achieved.

[0047] First, since unit tracks that form part of an infinite track can be manufactured and connected to each other, the manufacturing equipment can be miniaturized, which can save production space.

[0048] Second, installation is easier because there is no need for a completed ring structure when installing it on a vehicle.

[0049] Third, the removal process becomes easier because the endless rubber track can be easily removed from the vehicle by dismantling one unit track.

[0050] Fourth, repairs are easy because only the damaged unit track needs to be replaced.

[0051] Fifth, the two-layer arrangement of wires increases the strength, so the endless rubber track can be applied to relatively heavy vehicles, expanding its versatility.

[0052] Sixth, because losses due to manufacturing defects or replacement for repairs can be made on a per-orbit basis, resource loss can be reduced and their utilization rate can be increased.

[0053] Figure 1 is a reference drawing for explaining a typical crawler device.

[0054] Figures 2 and 3 are reference drawings for explaining a conventional endless rubber track.

[0055] FIG. 4 is a schematic side view of a portion of an endless rubber track according to one embodiment of the present invention.

[0056] Figures 5 to 16 are reference drawings for explaining the ring portion of the infinite rubber track of Figure 4.

[0057] Figures 17 and 18 are reference drawings for explaining the rubber part in the infinite rubber track of Figure 4.

[0058] Figure 19 is a reference diagram for explaining a unit orbit extracted from the infinite rubber track of Figure 4.

[0059] Figures 20 and 21 are reference drawings for explaining the form of a guide that can be applied to the endless rubber track of Figure 4.

[0060] A preferred embodiment according to the present invention is described with reference to the attached drawings, but for the sake of brevity, descriptions of well-known components are omitted or compressed as much as possible.

[0061] FIG. 4 is a schematic side view of a portion of an endless rubber track (200) according to one embodiment of the present invention.

[0062] In FIG. 4 and below, the X-axis is the direction in which the caterpillar track (CT) moves circularly when the vehicle moves forward or backward, the Y-axis is the width direction of the caterpillar track (CT) while being orthogonal to the X-axis, and the Z-axis is defined as a direction orthogonal to both the X-axis and the Y-axis.

[0063] The endless rubber track (200) of Fig. 4 includes a ring portion (210) and a rubber portion (230).

[0064] The ring portion (210) forms the basic framework that forms the ring structure of the endless rubber track (200).

[0065] The ring portion (210) forms a closed ring along the trajectory along which the endless rubber track (200) moves in a circular motion.

[0066] The ring portion (210) is responsible for the internal force of the endless rubber track (200), thereby supporting the tension generated in the X-axis direction, which is the circular movement direction of the endless rubber track (200), during driving.

[0067] The ring part (210) maintains the power transmission structure between the drive sprocket (DS) and the endless rubber track (200) by holding the position of the rubber part (220).

[0068] Figure 5 shows an excerpt of a ring portion (210) from the infinite rubber track (200) of Figure 4.

[0069] The ring portion (210) includes a plurality of wire segments (211) and a plurality of joints (212).

[0070] The wire joints (211) are made of metal wire (W).

[0071] Each wire segment (211) is placed between adjacent joints (212).

[0072] The wire joints (211) are provided in a structure in which wires (W) are wound in a ring shape, as shown in the exaggerated diagram of Fig. 6.

[0073] Referring further to the schematic diagram of Fig. 7, the wire nodes (211) form an area in which the wires (W) have a two-layer arrangement structure in the Z-axis direction in the YZ plane.

[0074] Assuming that the thickness of the wire (W) is the same and the width of the infinite rubber tracks (100, 200) is the same, the two-layer arrangement structure allows twice the number of wires (W) to be arranged per unit width compared to the conventional one-layer arrangement structure.

[0075] The two-layer array structure increases the strength of the endless rubber track (200), thereby enabling it to support high tension generated in the circular movement direction of the endless rubber track (200).

[0076] The two layers of wire (W) are spaced apart from each other to hold the rubber part (220) uniformly and as little as possible from an eccentricity in the Z-axis direction.

[0077] Depending on the implementation, the wires (W) may be arranged in two or more layers.

[0078] The joint (212) connects adjacent wire joints (211) and wire joints (212).

[0079] By connecting the joints (212) between the wire segments (211), the ring portion (210) can be completed in a closed ring shape.

[0080] Figure 8 is a schematic perspective view of a joint (212), and Figure 9 is a schematic exploded view of a joint (212).

[0081] Referring to FIGS. 8 and 9, the joint (212) includes a pair of bodies (212a), a pair of connectors (212b), a pair of coupling pins (212c), and a plurality of rubber bushings (212d) divided into pairs.

[0082] A pair of bodies (212a) are arranged adjacent to each other in the X-axis direction and are symmetrical with respect to the Y-axis line.

[0083] As shown in the extract of FIG. 10, the body (212a) includes a connecting portion (212a-1), a grip portion (212a-2), and a coupling portion (212a-3).

[0084] The connecting portion (212a-1) is connected to the connecting portion (212a-1) of the neighboring body (212a) by a connector (212b).

[0085] The connecting part (212a-1) serves to install and support various components such as the coupling pin (212c) and rubber bushing (212d).

[0086] The connecting portion (212a-1) is provided in a cylindrical shape with a placement hole (ah) formed in the Y-axis direction.

[0087] The coupling pin (212c) and rubber bushing (212d) are supported by the body (212a) by being placed in the placement hole (ah).

[0088] The phasing portion (212a-2) is spaced apart from the connecting portion (212a-1).

[0089] The gripping portion (212a-2) is formed to grip the gripping material. In this embodiment, the gripping material is a wire joint (211).

[0090] As shown in Fig. 11, one side (-X-axis direction side) of the wire joint (211) is gripped by the gripping part (212a-2) of the body (212a) located on one side of the wire joint (211), and the other side (+X-axis direction side) of the wire joint (211) is gripped by the gripping part (212a-2) of the body (212a) located on the other side of the wire joint (211).

[0091] As shown in the cross-sectional view of Fig. 12, the area (212a-2a) facing the connecting portion (212a-1) in the cross-section has an arc shape in the cross-section, and the opposite area (212a-2b) has a trapezoidal shape.

[0092] The wire (W) is gripped by the gripping portion (212a-2) while drawing a circular arc in the arc-shaped area (212a-2a). This gripping structure of the wire (W) extends the life of the wire (W) installed in a wound form around the gripping portion (212a-2).

[0093] The wire (W) does not interfere with the grip section (212a-2) in the trapezoidal area (B).

[0094] The trapezoidal area (212a-2b) of the grip section (212a-2) contributes to reducing the volume of the body (212a), thereby ultimately enabling weight reduction of the infinite rubber track (200).

[0095] The spacing between the first and second layers of the wire (W) is determined by the width of the arc region (212a-2a) in the Z-axis direction.

[0096] The connecting portion (212a-3) connects the connecting portion (212a-1) and the grip portion (212a-2).

[0097] A pair of connecting parts (212a-3) are spaced apart from each other in the Y-axis direction.

[0098] A pair of connecting parts (212a-3) connects both ends of the grip part (212a-2) to both ends of the connecting part (212a-1) in the X-axis direction.

[0099] The connecting portion (212a-1), the gripping portion (212a-2), and the pair of connecting portions (212a-3) form a closed square ring to form a gripping hole (gh). The gripping hole (gh) is formed by the connecting portion (212a-1), the gripping portion (212a-2), and the pair of connecting portions (212a-3).

[0100] One side of the wire joint (211) is placed on the grip hole (gh). Accordingly, one side of the wire joint (211) can be stably gripped to the body (212).

[0101] As shown in Fig. 13, the wire joint (211) located on one side (-X-axis direction side) with respect to the joint (212) is gripped by the gripping part (212a-2) of the body (212a) located on one side, and the wire joint (211) located on the other side (+X-axis direction side) is gripped by the gripping part (212a-2) of the body (212a) located on the other side.

[0102] As the connection structures of FIGS. 11 and 13 are continuously repeated, the ring portion (210) forms a closed ring.

[0103] A pair of connectors (212b) connect a pair of adjacent bodies (212a).

[0104] As shown in Fig. 9, a pair of connectors (212b) are arranged spaced apart from each other in the Y-axis direction.

[0105] A pair of insertion holes (ih) are formed in parallel in the X-axis direction in the connector (212b), and a fixing hole (fh) is formed in the Z-axis direction between the pair of insertion holes.

[0106] A pair of coupling pins (212c) are arranged in the arrangement holes (ah) respectively in a pair of bodies (212a).

[0107] In the Y-axis direction, both ends of the coupling pin (212c) protrude from the arrangement hole (ah) and are inserted into the insertion hole (ih).

[0108] A pair of coupling pins (212c) each have a flat cut surface (cs) formed at both ends inserted into the insertion hole (ih).

[0109] As shown in Fig. 14, when the fixing bolt (B) and the trapezoidal fixing nut (N) are fastened to each other through the fixing hole (fg) while both ends of the coupling pin (212c) are inserted into the insertion hole (ih), the cut surface (cs) of the coupling pin (212c) and the outer surface of the fixing nut (N) come into contact, so that the coupling pin (212c) is fixedly coupled to the connector (212b). Here, the fixing bolt (B) and the fixing nut (N) may be interpreted as separate components from the connector (212b), or may be interpreted as some components forming the connector (212b).

[0110] When a pair of coupling pins (212c) each arranged in the arrangement holes (ah) of a pair of bodies (212a) are fixedly joined by a connector (212c), a pair of adjacent bodies (212a) are interconnected.

[0111] A pair of bodies (212a) can be interconnected or disconnected by a connector (212b) via a coupling pin (212c).

[0112] The rubber bushings (212d) are each ring-shaped and are placed on the placement holes (ah).

[0113] The rubber bushing (212d) is placed between the inner surface forming the arrangement hole (ah) and the outer surface of the coupling pin (212c).

[0114] Rubber bushings (212d) are arranged parallel in the Y-axis direction between the body (212a) and the coupling pin (212c).

[0115] The rubber bushings (212d) improve the resistance to twisting between the body (212a) and the coupling pin (212c) and reduce the fatigue of the metal body (212a) or coupling pin (212c) by alleviating the impact of tension generated in the ring portion (210) during the driving of the vehicle.

[0116] By having a structure in which the coupling pins (212c) and the rubber bushings (212d) are inserted and arranged in the arrangement holes (ah) of the body (212a), the installation angle between the adjacent bodies (212a) can be adjusted as in Fig. 15. Therefore, a curved endless rubber track (200) as in Fig. 16 can be produced. By giving the angle between the adjacent bodies (212a) in this way, when considering the installation shape of the endless rubber track (200) that must be assembled to the vehicle in a ring shape, the twist angle of the rubber bushing (212d) can be minimized. To that extent, the durability of the rubber bushing (212d) can be improved.

[0117] For reference, since the rubber bushing (212d) is inserted and attached in a highly compressed state between the body (212a) and the coupling pin (212c), the angle set between the bodies (212a) during the manufacturing process can be firmly maintained by the very strong elasticity of the rubber bushing (212d).

[0118] The rubber part (220) is combined with a structure that is added to the ring part (210) and comes into contact with the ground.

[0119] The rubber part (220) is formed in a structure that surrounds the ring part (210) and is made of rubber material.

[0120] The rubber part (220) can be formed to be attached to the ring part (210) by applying an adhesive to the ring part (210) and then coating it with a rubber material.

[0121] As shown in Fig. 17 with exaggerated mutual spacing, the rubber part (220) is composed of a plurality of rubber joints (221).

[0122] The rubber joints (221) are arranged adjacent to each other and continuously along the ring portion (210).

[0123] The adjacent rubber joints (221) are mutually segmented.

[0124] According to a preferred example, the rubber joints (221) and the wire joints (211) correspond one-to-one.

[0125] As shown in the extract of FIG. 18, the rubber joint (221) can be added so as to completely surround the wire joint (211) placed between the adjacent joints (212) and the joints (212).

[0126] The wire joints (211) do not come into direct contact with the ground because they are completely surrounded by the rubber joints (221). When the endless rubber track (200) moves in a circular manner, the rubber joints (221), which are the rubber parts (220), come into contact with the ground. The rubber joints (221) cushion the impact generated from the poor ground and protect the wire joints (211).

[0127] The rubber joint (221) can be formed to further wrap around the grip portion (212a-2) that is gripping the wire joint (211).

[0128] The rubber joint (221) can be formed to further wrap around the connecting portion (212a-1) combined with the gripping portion (212a-2) that is gripping the wire joint (211).

[0129] According to the present embodiment, as shown in FIG. 19, a wire joint (211), a body (212a) on both sides of the wire joint (211) that grips the wire joint (211), a coupling pin (212c) and rubber bushings (212d) coupled to the body (212a), and a rubber joint (221) corresponding to the wire joint (211) form an integral unit track (UT).

[0130] Unit orbits (UT) are connected in a ring shape by connectors (212b) to form an endless rubber track (200).

[0131] The rubber joints (221) forming the rubber part (220) are provided for each unit orbit (UT) and are segmented between neighboring unit orbits (UT).

[0132] The unit tracks (UTs) can be selectively disassembled from the endless rubber track (200) by separating the connector (212b) connecting a pair of adjacent bodies (212a).

[0133] We will now look at the repair process for damage to the infinite rubber track (200) as described above.

[0134] The rubber track (200) may often pass over rough and sharp surfaces, which may cause damage to a particular unit track (UT).

[0135] Damage to the wire joint (211) in the unit track (UT) can be fatal as it can result in a failure to support the tension of the endless rubber track (200). Therefore, the defective unit track (UT) needs to be replaced.

[0136] During replacement work, the repairer loosens the fixing bolts (B) and fixing nuts (N) at the joints (212) on both ends of the defective unit track (UT) to separate the connector (212b).

[0137] When the connector (212b) is separated, the connection between the adjacent bodies (212a) is released, and the defective unit track (UT) can be dismantled from the endless rubber track (200). After this, a good unit track (UT) is placed in the location where the defective unit track (UT) was removed, and the connector (212b) is connected to complete the repair of the endless rubber track (200).

[0138] Additional Information

[0139] The infinite rubber track (200) may have guides (G) that guide circular movement.

[0140] The guides (G) are formed to protrude in the Z-axis direction and can be arranged continuously with a predetermined interval from each other in the X-axis direction.

[0141] As in the example of Fig. 20, the guiders (G) can be formed integrally with the rubber part (220).

[0142] As in the example of Fig. 21, the guide (G) may be formed as a part of the body (212a) in the joint (212) constituting the ring portion (210).

[0143] A guider (G) may be provided for each unit orbit (UT), but may also be provided for only some unit orbits (UT).

[0144] For example, when a guider (G) is formed in a joint (212) as shown in Fig. 21, it may be provided only in some joints (212).

[0145] Meanwhile, the configuration and structure of the joint (212) need not necessarily be limited to the endless rubber track (200), and can be preferably applied to any endless track (CT).

[0146] The above-described embodiments merely illustrate preferred examples of the present invention, and it may have various applications. Therefore, the present invention should not be construed as limited to the above-described content. Instead, the scope of the present invention should be construed within the scope of the separately described claims and their equivalents.

Claims

1. A ring portion (210) forming a closed ring; and It is formed in a structure that surrounds the above ring portion (210), comes into contact with the ground, and includes a rubber portion (220) made of rubber material; The above rubber part (220) has a plurality of rubber joints (221) that are segmented from each other and arranged continuously adjacent to each other. Infinite rubber track (200).

2. In paragraph 1, The above ring part (210) is A plurality of wire joints (211) made of metal wire (W); and A plurality of joints (212) that complete a closed loop by connecting the above wire joints (211); Infinite rubber track (200).

3. In paragraph 2, The above rubber joints (221) and the above wire joints (211) correspond one-to-one, The above rubber joint (221) wraps around the corresponding wire joint (211), so that the rubber joint (221) and the wire joint (211) form an integral unit orbit (UT). When the above joint (212) is disassembled, the unit orbit (UT) coupled to the joint (212) can be disassembled. Infinite rubber track (200).

4. A ring portion (210) forming a closed ring; and It is formed in a structure that surrounds the above ring portion (210), comes into contact with the ground, and includes a rubber portion (220) made of rubber material; The above ring part (210) is A plurality of wire joints (211) made of metal wire (W); and A plurality of joints (212) that complete a closed loop by connecting the above wire joints (211); Infinite rubber track (200).

5. In paragraph 2 or paragraph 4, The above wire joints (211) have an area having a two-layer arrangement structure in the direction (Z-axis direction) orthogonal to the circular movement direction (X-axis direction) and the width direction (Y-axis direction). Infinite rubber track (200).

6. In paragraph 2 or paragraph 4, At least some of the above multiple joints (212) have a guide (G) that guides the circular movement. Infinite rubber track (200).

7. In paragraph 2 or paragraph 4, The above joint (212) is A pair of bodies (212a) arranged adjacent to each other; and It includes a connector (212b) for connecting the above pair of bodies (212a); The above pair of bodies (212a) each have a gripping portion (212a-2) for gripping the wire joint (211). Infinite rubber track (200).

8. A ring portion (210) forming a closed ring; and It is formed in a structure that surrounds the above ring portion (210), comes into contact with the ground, and includes a rubber portion (220) made of rubber material; The above ring portion (210) includes a wire (W) having a region having a two-layer arrangement structure in the direction (Z-axis direction) orthogonal to the circular movement direction (X-axis direction) and the width direction (Y-axis direction). Infinite rubber track (200).

9. A pair of bodies (212a) arranged adjacent to each other; and It includes a connector (212b) for connecting the above pair of bodies (212a); The above pair of bodies (212a) are each, A connecting portion (212a-1) for connecting to a neighboring body (212a) by the above connector (212b); A gripping portion (212a-2) separated from the above connecting portion (212a-1) and for gripping the object to be gripped; and It includes a coupling part (212a-3) that couples the above-mentioned grip part (212a-2) to the above-mentioned connecting part (212a-1); The above pair of bodies (212a) can be connected or disconnected from each other by the connector (212b). Joint for track (CT) (212).

10. In paragraph 9, The above-mentioned grip portion (212a-2) has an area (212a-2a) facing the above-mentioned connecting portion (212a-1) in the shape of an arc in cross section. Joint for track (CT) (212).

11. In paragraph 9, The above-mentioned connecting portion (212a-3) is provided as a pair spaced apart from each other, A grip hole (gh) is formed by the above connecting portion (212a-1), the grip portion (212a-2) and the pair of connecting portions (212a-3). The structure in which a part of the above-mentioned phage material is placed on the above-mentioned phage hole (gh) and the above-mentioned phage material is gripped by the above-mentioned phage part (212a-2). Joint for track (CT) (212).

12. In paragraph 9, The above pair of bodies (212a) can have an adjustable installation angle with respect to each other. Joint for track (CT) (212).

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