JP2009085392A - Chain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight, high strength chain without using special high strength material. <P>SOLUTION: A pair of outer plates 3a. 3b having ribs 15 are provided face to face with mutually facing the ribs 15 outward, and inner plates 5a, 5b having ribs 19 are provided face to face at the inside of the outer plates 3a, 3b with mutually facing the ribs inward. Both ends of a bushing 7 are fitted in bushing holes 17 of the inner plate 5a, 5b. A pin 9 is inserted in the bushing 7 and pin holes 13 of the outer plates 3a, 3b. The outer plates and the inner plates are connected rotatably around the pin 9. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a light and strong chain.

Conventionally, a chain used for a conveyor or the like is required to have strength, corrosion resistance, and the like according to a use environment. In particular, lack of strength is one of the important characteristics because it leads to chain breakage. On the other hand, the weight of the chain itself imposes a load on a motor or the like that drives the chain, and a larger chain is required to drive a heavy chain. Therefore, it is desirable to use a light chain. Therefore, it is desirable that the chain be light and have high strength.

As a conventionally used chain, for example, there is a chain provided by connecting a plurality of outer plates and a plurality of inner plates rotatably with pins (Patent Document 1). Further, there is an offset type chain in which the outer plate portion and the inner plate portion are formed by a single plate, and the outer plate portion and the inner plate portion of the pair of plates are rotatably connected by pins (Patent Document 2). .
JP 2007-176615 A JP 2007-170602 A

However, in order to increase the strength of the chain composed of the outer plate and the inner plate as in Patent Document 1, it is necessary to increase the overall plate thickness or use a high-strength material. However, there is a problem that the weight increases, and the use of a high-strength material increases the cost.

Similarly to Patent Document 1, an offset chain such as Patent Document 2 needs to use a thick plate or a high-strength material in order to increase strength, and thus has a problem of increased weight and cost.

The present invention has been made in view of such problems, and an object of the present invention is to provide a lightweight and high-strength chain without using a special high-strength material.

In order to achieve the above-described object, the first invention provides a pair of outer plates that are provided opposite to each other and have pin holes at both ends, and a pair of inner plates that are disposed inside the outer plate and have bush holes at both ends. A plate, a bush provided inside the inner plate and having a through hole therein, the pin hole of the outer plate, the bush hole of the inner plate, and the through hole of the bush, And a pin that rotatably connects the plate and the inner plate, and a rib is provided on the outer plate and / or the inner plate.

The rib provided on the outer plate may be provided toward the outside of the chain, and the rib provided on the inner plate may be provided toward the inside of the chain.

According to the first invention, since the outer plate and the inner plate constituting the chain are provided with ribs, it is possible to obtain high strength, and it is not necessary to increase the thickness of the portion that does not require strength, Since the ribs of the outer plate are directed outward and the ribs of the inner plate are directed inward, there is no contact between the ribs, thus providing a high-strength and lightweight chain that is free of rib wear. be able to.

2nd invention has a pair of offset which has an outer plate part in which a pin hole was provided, and an inner plate part in which a bush hole was provided, and has a level difference between the outer plate part and the inner plate part A plate, a bush provided inside the inner plate portion and having a through hole therein, the pin hole in the outer plate portion, the bush hole in the inner plate portion of the adjacent offset plate, and the bush And a pin that rotatably connects the outer plate portion and the inner plate portion, and the offset plate is provided with a rib.

According to the second invention, since the rib is provided on the offset plate having the outer plate portion and the inner plate portion, high strength can be obtained, and it is not necessary to increase the thickness of the portion that does not require strength, Further, since the outer plate portion and the inner plate portion are integrated, a high-strength and lightweight chain with a small number of parts can be provided.

According to a third aspect of the present invention, there is provided a multiple link portion having a pair of links provided with pin holes, a single link portion having a single link provided with pin holes, the multiple link portion and the single link portion. A main body member having an arm portion to be coupled, the pin hole of the multi-link portion, and the pin hole of the single link portion of the adjacent main body member are penetrated, and the multi-link portion and the single link portion And a pin that rotatably connects to the main body member, and a rib is provided on the main body member.

The rib provided in the single link portion is provided along an outer peripheral portion of the link portion of the single link portion and / or an outer peripheral portion of the pin hole, and the rib provided in the multiple link portion is The ribs provided on the outer peripheral portion of the link portion and / or the outer peripheral portion of the pin hole and provided on the arm portion may be provided on the outer peripheral portion of the arm portion.

The arm portion may further include an attachment mounting portion.

According to the third invention, since the rib is provided in the single link portion and the multiple link portion, and the rib portion is provided in the arm portion connecting the single link and the portion and the multiple link portion, high strength can be obtained. Since there is no need to increase the thickness of the portion that does not require strength, a high-strength and lightweight chain can be provided.

According to the present invention, a lightweight and high-strength chain can be provided without using a special high-strength material.

Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a configuration diagram of a chain 1 according to the present embodiment, and FIG. 2 is an overview of the chain 1. The chain 1 is mainly composed of an outer plate 3, an inner plate 5, a bush 7, a pin 9, and the like.

The outer plate 3 is a plate-like member provided with ribs 15 around it, and pin holes 13 are provided near both ends of the outer plate 3. The inner plate 5 is a plate-like member provided with ribs 19 around it, and bush holes 17 are provided near both ends of the inner plate 5. The bush 7 is a cylindrical member having a hole 8 therein, and the outer diameter of the bush 7 is substantially the same as the bush hole 17. Moreover, the diameter of the hole 8 is a diameter in which the pin 9 can be inserted. The pin 9 is a rod-shaped member, and a hole 21 is provided at the tip.

A pair of outer plates 3a, 3b are provided facing each other with the ribs 15 facing outward. Inside the outer plates 3a, 3b, inner plates 5a, 5b are provided facing each other with the ribs 17 facing inward. It is done. Both ends of the bush 7 are fitted into the bush holes 17 of the inner plates 3a and 3b. The bush 7 and the pin holes 13 of the outer plates 3a and 3b are arranged linearly, and the pins 9 are inserted.

The pin 9 penetrates the pin hole 13 of the outer plate 3b, the bush hole 17 of the inner plate 5b, the hole 8 of the bush 7, the bush hole 17 of the inner plate 5a, the pin hole 13 of the outer plate 3a, and the insertion side of the pin 9 The stopper 11 is inserted into the hole 21 provided in the portion protruding to the opposite side. Since the diameter of the pin hole 13 is sufficiently larger than the outer diameter of the pin 9, and the diameter of the hole 8 is sufficiently larger than the outer diameter of the pin 9, the chain 1 has the outer plate 3, The plate 5 is rotatably connected. The bush 7 may not be fitted into the bush hole 17. In this case, for example, the diameter of the bush hole 17 may be a diameter that allows the pin 9 to pass therethrough, and the bush 7 may be disposed inside the bush hole 17 so that the bush 7 and the inner plate 5 are rotatably connected.

2A is a perspective view of the chain 1, and FIG. 2B is a cross-sectional view taken along the line AA in FIG. 2A. As shown in FIG. 2B, the pin 9 is provided through the pin hole 13 and the bush 7, and the stopper 11 is inserted into the hole 21. The stopper 11 is made of metal that is easily plastically deformed and is straight when inserted, but can be easily bent after insertion. Since the stopper 11 is bent after being inserted into the hole 21, the pin 9 does not fall out of the chain 1.

Further, as shown in FIG. 2 (b), the ribs 15 of the outer plate 3 arranged on the outer side of the chain 1 are directed to the outer side of the chain 1, and the ribs 17 of the inner plate 5 arranged on the inner side thereof are The rib 15 and the rib 17 are not in contact with each other.

In addition, although the material of the outer plate 3, the inner plate 5, the bush 7, and the pin 9 is not specified, resin or metal can be used, and if it is made of resin, for example, polyacetal, nylon, ultrahigh molecular weight polyethylene, metal If so, stainless steel, aluminum or the like can be used. Here, in order to prevent corrosion due to the contact potential of the outer plate 3, the inner plate 5, the bush 7, etc., the outer plate 3, the inner plate 5, the bush 7, etc. are made of the same metal material or made of resin. Is desirable.

Thus, according to the chain 1 according to the present embodiment, the outer plate 3 and the inner plate 5 have the ribs 15 and the ribs 19 respectively, so that the strength of the outer plate 3 and the inner plate 5 is high. Since the ribs 15 and the ribs 19 are disposed only on the outer peripheral portions of the outer plate 3 and the inner plate 5 including the periphery of the pin hole 13 and the bushing hole 17 that need to be removed, the overall thickness of the outer plate 3 and the inner plate 5 is increased. Therefore, the strength can be increased, and thus a high-strength and lightweight chain 1 can be obtained.

Moreover, since the rib 15 and the rib 19 are opposite to each other and do not contact each other, the rib 15 and the rib 19 are not worn when the chain 1 is used, and the high-strength and lightweight chain 1 is obtained. Obtainable.

Next, a second embodiment will be described. 3A and 3B are diagrams showing a chain 30 according to the second embodiment, in which FIG. 3A is a perspective view of the chain 30, and FIG. 3B is a cross-sectional view taken along line BB in FIG. 3A. . In the following embodiment, components having the same functions and effects as those of the chain 1 shown in FIG. 1 are denoted by the same reference numerals as those in FIG.

The chain 30 mainly includes an offset plate 35, a bush 7, a pin 9, and the like. The offset plate 35 is a plate-like member provided with ribs 37 on the outer periphery, and one end portion is an outer plate portion 31 and the other end portion is an inner plate portion 33. A pin hole 13 is provided in the outer plate portion 31. A bush hole 17 is provided in the inner plate portion 33. A step 39 is provided between the outer plate portion 31 and the inner plate portion 33. Although the outer plate portion 31 and the inner plate portion 33 are not coplanar due to the step 39, the outer plate portion 31 and the inner plate portion 33 are substantially parallel surfaces.

A pair of offset plates 35a and 35b are arranged so that the outer plate portions 31a and 31b spread outward, and the inner plate portions 33c and 33d of a pair of adjacent offset plates 35c and 35d arranged in the same manner are arranged. The offset plates 35a, 35b, 35c, and 35d are arranged so as to be inside the outer plate portions 31a and 31b.

A bush 7 having a hole 8 therein is provided inside the inner plate portions 33c and 33d, and the bush 7 is fitted into the bush holes 17 of the inner plate portions 33c and 33d. The pin hole 13 and the bush 7 of the outer plate portions 31 a and 31 b are provided in a substantially linear shape, and the pin 9 is inserted into the pin hole 13.

The pin 9 passes through the pin hole 13 of the outer plate portion 31b, the bush hole 17 of the inner plate portion 33d, the hole 8 of the bush 7, the bush hole 17 of the inner plate portion 33c, and the pin hole 13 of the outer plate portion 31a. The stopper 11 is inserted into a hole 21 provided in a portion protruding to the opposite side of the insertion side 9. The stopper 11 is bent after insertion, and the pin 9 does not fall off the chain 30. Since the diameter of the pin hole 13 is sufficiently larger than the outer diameter of the pin 9, and the diameter of the hole 8 is sufficiently larger than the outer diameter of the pin 9, the chain 30 has the outer plate portion 31, The inner plate portion 33 is rotatably connected.

In addition, although the material of the offset plate 35, the bush 7, and the pin 9 is not specified, resin or metal can be used, and if it is made of resin, for example, polyacetal, nylon, ultra high molecular polyethylene, or metal, Stainless steel, aluminum, etc. can be used. Here, in order to prevent corrosion due to the contact potential of the offset plate 35, the bush 7, etc., it is desirable that the offset plate 35, the bush 7, etc. are made of the same material metal or resin.

According to the chain 30 concerning 2nd Embodiment, there exists an effect similar to the chain 1. FIG. Further, since the offset plate 35 has the outer plate portion 31 and the inner plate portion 33 at both ends, it is not necessary to make separate components like the outer plate 3 and the inner plate 5, so the number of components is small, and the offset plate 35 Since the ribs 37 are provided, the high-strength and lightweight chain 30 can be obtained without making the entire offset plate 35 thick.

Next, a chain 60 according to a third embodiment will be described. The chain 60 is used for a relatively large transport device or the like. For this reason, the chain 60 requires high strength. FIG. 4 is a view showing the main body member 40 constituting the chain 60. FIG. 4 (a) is a perspective view showing the main body member 40, and FIG. 4 (b), FIG. 4 (c), and FIG. It is CC sectional drawing, DD sectional drawing, and EE sectional drawing of Fig.4 (a). The main body member 40 is mainly composed of a single link portion 43 having a single link 41, a multiple link portion 45 having a pair of links 42, an arm 47 connecting the single link portion 43 and the multiple link portion 45, and the like. The

The link 41 is provided with a pin hole 13 at the center. A rib 49 a is provided around the pin hole 13, and a rib 49 b is provided on the outer periphery of the link 41. A pin hole 13 is provided at the center of the link 42. A pair of links 42 are provided on the multi-link portion 45 so as to face each other so that the axes of the respective pin holes 13 coincide. A rib 49d is provided around the pin hole 13 provided in the link 42, and a rib 49e is provided on the outer periphery of the link 42.

The single link portion 43 provided with the link 41 and the multiple link portion 45 provided with the link 42 are connected by an arm 47. That is, the single link 41 and the pair of links 42 are connected by the arm 47. A rib 49 c is provided on the outer periphery of the arm 47. The ribs 49 a, 49 b, 49 c, 49 d, and 49 e are provided substantially on both sides of the main body member 40. Moreover, although the material of the main body member 40 is not specified, steel can be used, for example, In this case, it can manufacture by casting, forging, etc.

FIG. 5 is a view showing the main body member 50 constituting the chain 60. FIG. 5 (a) is a perspective view showing the main body member 50, and FIG. 5 (b), FIG. 5 (c), and FIG. It is FF sectional drawing of FIG.5 (a), GG sectional drawing, and HH sectional drawing. The main body member 50 has substantially the same structure as the main body member 40. Accordingly, components having the same functions and effects as those of the main body member 40 are denoted by the same reference numerals as those of the main body member 40, and redundant description is omitted. The main body member 50 mainly includes a single link portion 43 having a single link 41, a multi-link portion 45 having a pair of links 42, an arm 47 connecting the single link portion 43 and the multi-link portion 45, and an attachment mounting portion 51. Etc. The attachment mounting portion 51 is provided on the arm 47.

The attachment attachment portion 51 is a part for attaching an attachment 69 to be described later, and is a plate-like part material having attachment holes 53 at four corners and a constricted center. The main body member 50 is different from the main body member 40 in that it has an attachment mounting portion 51, but the other components are the same, such as having ribs 49 a, 49 b, 49 c, 49 d, and 49 e as in the main body member 40. . The attachment mounting portion 51 may be formed integrally with the main body member 50, or may be processed separately and joined by welding or the like.

6A and 6B are diagrams showing the chain 60. FIG. 6A is a plan view of the chain 60 and FIG. 6B is a side view of the chain 60. FIG. The chain 60 mainly includes a main body member 40, a main body member 50, a pin 61, a retaining member 63, and the like.

The single link portion 43b of the adjacent main body member 40b is disposed in the multiple link portion 45a of the main body member 40a. That is, the link 41b of the main body member 40b is disposed so as to be sandwiched between the pair of links 42a of the main body member 40a. A pin 61 is inserted into the pin hole 13 of the link 41b, 42a, and the pin 61 passes through the pin hole 13 of the link 41b and the pin hole 13 of the link 42a. A groove 65 is provided on the outer peripheral surface near the end of the pin 61 in a direction perpendicular to the axial direction of the pin 61. The groove 65 is provided with a plate-like retaining 63. The retainer 63 is joined to the main body member 40 by welding or the like. That is, the pin 61 is fixed by the stopper 63 fitted in the groove 65, and the pin 61 does not fall off from the chain 60. Moreover, since the diameter of the pin hole 13 is sufficiently larger than the outer diameter of the pin 61, the main body members 40a and 40b are rotatably connected. In addition, although the material of the pin 61 and the retainer 63 is not specified, it may be made of steel, for example.

Similarly, the single link portion 43 c of the main body member 50 and the multiple link portion 45 b of the main body member 40 b are rotatably connected by the pin 61 and the retaining member 63. In addition, the main body member 50 is provided for every fixed number of connections of the main body member 40. For example, one main body member 50 may be connected each time two main body members 40 are connected. An attachment 69 having a skewer 67, which will be described later, is attached to the attachment attachment portion 51 of the main body member 50.

7A and 7B are diagrams showing the transporting device 70 using the chain 60. FIG. 7A is a plan view of the transporting device 70, and FIG. 7B is a side view of the transporting device 70. The transporting device 70 mainly includes a pair of chains 60a and 60b, a sprocket 71, a motor (not shown) that drives the sprocket 71, an attachment 69 provided on the chains 60a and 60b at regular intervals, and the like. A pair of sprockets 71 are provided for one chain 60.

Both or one of the sprockets 71a and 71b is connected to a motor (not shown) and is rotated by the motor. A plurality of teeth 73 are provided on the outer circumferences of the sprockets 71 a and 71 b, and the teeth 73 mesh with the main body member 40 or the main body member 50 constituting the chain 60.

A plate-like attachment 69 is joined to the attachment mounting portion 51 of the main body member 50 constituting the chain 60. The attachment 69 is joined by a bolt or the like in the attachment hole 53 of the attachment attachment portion 51. The attachment 69 is provided with a plurality of plate-like skewers 67 facing outward.

As shown in FIG. 7B, when the sprocket 71a or the sprocket 71b is rotated in the direction of arrow I by the motor, the teeth 73 provided on the sprockets 71a and 71b mesh with the chain 60. As a result of the rotation, the whole rotates.

8A and 8B are diagrams showing the meshing between the chain 60 and the sprocket 71. FIG. 8A is a plan view and FIG. 8B is a side view. In addition, illustration of the sprocket 71 is abbreviate | omitted in Fig.8 (a). A pair of teeth 73 are provided in parallel in the width direction of the sprocket 71, and a plurality of pairs of teeth 73 are provided at regular intervals in the circumferential direction of the sprocket 71. As shown in FIG. 8B, when the sprocket 71 rotates in the arrow M direction, the teeth 73 come into contact with the main body member 40 constituting the chain 60 or the multiple link portions 45 of the main body member 50. That is, the teeth 73 provided in parallel transmit force to the respective end portions of the pair of links 42 constituting the multiple link portion 45.

Since the circumferential pitch of the teeth 73 provided on the sprocket 71 coincides with the connection pitch of the main body member 40 or the main body member 50 of the chain 60, the teeth 73 respectively contact the main body member 40 or the multi-link portion of the main body member 50. The force is transmitted to 45. The arrow K in FIG. 8A and the arrow L in FIG. 8B indicate the direction of force transmission from the teeth 73 to the chain 60.

The transporting device 70 drives the chain 60 by the rotation of the sprocket 71. As shown in FIG. 7B, the transported object 75 placed under the transporting device 70 is scraped up by the attachment 69 and the skewer 67, and the arrow Transport in J direction. The conveyed product 75 is, for example, an intermediate processed product of agricultural crops, and the conveying device 70 is used for conveying a relatively large and large-scale item. Therefore, a high-strength chain 60 is used for the transport device 70.

Thus, according to the chain 60 concerning 3rd Embodiment, there exists an effect similar to the chain 1. FIG. Moreover, since the ribs 49a, 49b, 49c, 49d, and 49e are provided in the single link part 43, the multiple link part 45, and the arm 47, respectively, the high-strength chain 60 can be obtained. In particular, ribs 49a and 49d are provided around the pin hole 13 where strength is required, ribs 49b and 49e are provided on the outer periphery of the link 41 or link 42, and ribs 49c are provided on the arm 47 floor. It is done. For this reason, since the rib 49a to the rib 49e are provided only in a portion where strength is required, it is not necessary to increase the overall thickness, and a weight increase is suppressed to a minimum, and a high-strength and lightweight chain 60 is obtained. Can do.

As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

For example, in the chain 1, the ribs 15 and the ribs 19 are provided on the outer peripheral portions of the outer plate 3 and the inner plate 5, respectively, but the ribs may be provided only on either the outer plate 3 or the inner plate 5. Further, the rib 15 and the rib 19 may not be provided on the entire outer peripheral portion of the outer plate 3 and the inner plate 5. For example, the rib 15 may be provided only around the pin hole 13, and the rib 19 may be provided only around the bush hole 17. Similarly, the ribs 37 may be provided only around the pin holes 13 or around the bush holes 17 in the chain 30, and the ribs 37 may be provided either outward or inward of the chain 30. In the chain 60, it is not necessary to provide all the ribs 49a to 49e, and only one part of the ribs 49a to 49e may be provided as necessary.

The lineblock diagram of chain 1 concerning a 1st embodiment. 2A and 2B are diagrams showing the chain 1, in which FIG. 1A is a perspective view of the chain 1, and FIG. 4A and 4B are diagrams showing a chain 30 according to a second embodiment, in which FIG. 4A is a perspective view of the chain 30 and FIG. (A) is a perspective view showing the main body member 40, (b) is a CC cross-sectional view of (a), (c) is a DD cross-sectional view of (a), (d) EE of (a). Sectional drawing. (A) is a perspective view showing the main body member 50, (b) is an FF sectional view of (a), (c) is a GG sectional view of (a), (d) HH of (a). Sectional drawing. It is a figure which shows the chain 60, (a) is a top view of the chain 60, (b) is a side view of the chain 60. It is a figure which shows the conveying apparatus 70 using the chain 60, (a) is a top view of the conveying apparatus 70, (b) is a side view of the conveying apparatus 70. It is a figure which shows mesh | engagement of the chain 60 and the sprocket 71, (a) is a top view, (b) is a side view.

Explanation of symbols

1, 30, 60 ......... Chain 3 ......... Outer plate 5 ......... Inner plate 7 ......... Bush 8 ...... Hole 9 ......... Pin 11 ......... Pullout 13 ......... Pin hole 15 ... …… Rib 17 ………… Bushing hole 19 ………… Rib 21 ………… Hole 31 ………… Outer plate portion 33 ………… Inner plate portion 35 ………… Offset plate 37 ………… Rib 39 ……… Step 40 50 ......... Main body members 41, 42 ......... Link 43 ......... Single link portion 45 ......... Multi-link portion 47 ......... Arms 49 ......... Rib 51 ......... Attachment mounting portion 53 ......... Mounting Hole 61 ......... Pin 63 ......... Retaining 65 ......... Groove 67 ......... Skewer 69 ...... Attachment 71 ...... Sprocket 73 ......... Conveyed Goods

Claims (9)

A pair of outer plates provided facing each other and having pin holes at both ends;
A pair of inner plates disposed inside the outer plate and having bush holes at both ends;
A bush provided inside the inner plate and having a through hole therein;
A pin that rotatably connects the outer plate and the inner plate through the pin hole of the outer plate, the bush hole of the inner plate, and the through hole of the bush;
And a rib provided on the outer plate and / or the inner plate. The chain according to claim 1, wherein the rib provided on the outer plate is provided toward the outside of the chain. The chain according to claim 1, wherein the rib provided on the inner plate is provided toward an inner side of the chain. A pair of offset plates having an outer plate portion provided with a pin hole and an inner plate portion provided with a bush hole, and having a step between the outer plate portion and the inner plate portion;
A bush provided inside the inner plate portion and having a through hole inside;
The outer plate portion and the inner plate portion are rotatable through the pin hole of the outer plate portion, the bush hole of the inner plate portion of the adjacent offset plate, and the through hole of the bush. A pin connected to
And a rib is provided on the offset plate. A multi-link portion having a pair of links provided with pin holes, a single link portion having a single link provided with pin holes, and an arm portion connecting the multi-link portion and the single link portion. A main body member comprising:
A pin that penetrates the pin hole of the multiple link part and the pin hole of the single link part of the adjacent body member, and rotatably connects the multiple link part and the single link part;
And the main body member is provided with a rib. The chain according to claim 5, wherein the rib provided in the single link portion is provided along an outer peripheral portion of the link portion of the single link portion and / or an outer peripheral portion of the pin hole. The said rib provided in the said multiple link part is provided along the outer peripheral part of the said link part of the said multiple link part, and / or the outer peripheral part of the said pin hole, The Claim 5 or Claim 6 characterized by the above-mentioned. chain. The chain according to any one of claims 5 to 7, wherein the rib provided on the arm portion is provided on an outer peripheral portion of the arm portion. The chain according to claim 5, further comprising an attachment mounting portion on the arm portion.

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