CN2613644Y - Chain - Google Patents

Abstract

The utility model relates to a chain which is formed by connecting a plurality of series connection units in series. Each series connection unit comprises two distant inner chain pieces, two outer chain pieces which are respectively positioned outside the inner chain pieces, a chain roller which is positioned between the two inner chain pieces, and a chain shaft which penetrates through the chain roller, the inner chain pieces and the outer chain pieces, wherein the chain pieces all comprise a piece body and a through hole which penetrates through the two end sections and one waist section of the piece body, at least one reinforcing rib is arranged on the piece body and surrounds the through hole, the chain shaft and the chain roller are in hollow design, and a plurality of notches which are dented in an axial direction are parallelly arranged on the chain roller. By using the weight reduction design of the parts and the reinforcing rid which is used for matching, under the condition of sufficient structural strength of the chain, the goal of light weight is achieved.

Description

Chain

Technical field

The utility model relates to a kind of chain, relates in particular to a kind ofly to have under the prerequisite of enough structural strengths, has the chain of lightweight effect.

Background technique

Chain can be divided into two kinds of fabricated metals and on-metallic articles because of part material is different in design in the past, wherein the structure of metal bracelet is roughly as Fig. 1, No. 132735 patent case of Announcement Number shown in Figure 2, promptly this metal bracelet is formed by a plurality of serial connections unit 1 serial connection, each serial connection unit 1 all comprises: the inner chain sheet 11 of two internal and external partitions, one chain that is positioned at 11 of two inner chain sheets rolls 12, the outer chain sheet 13 of two internal and external partitions, and one run through in, outer chain sheet 11,13 and with two outer chain sheets 13 chain rivet 14 of interlock regularly, in order to strengthen the structural strength of chain, on two arc end part 131 of outer chain sheet 13, be respectively equipped with an outstanding from inside to outside stiffening rib 132.

This known metal bracelet no doubt can be because of the design of arc stiffening rib 132, make outer chain sheet 13 have preferable structural strength, but with regard to the trends of design of existing bicycle chain, this metal bracelet but exists the running effort, friction noise is big, and defective such as safety in utilization is lower, cause the key of described defective to be that all existing metal bracelet is not inconsistent light-weighted design principle, below perform an analysis at each part of metal bracelet:

One, in the combination kenel of metal bracelet, inside and outside chain sheet 11,13 accounts for the very high proportion of whole piece chain, and existing metal bracelet is provided with the perforation except the position of passing for chain rivet 14, and full wafer chain sheet 11,13 all is solid design.

Two, the chain rivet 14 that is used for running through inside and outside chain sheet 11,13 on the existing metal bracelet also is solid design.

Three, the hollow ring round chain of existing metal bracelet rolls 12, no doubt have in use to reduce the function that rubs between chain and fluted disc, but with regard to the use function that chain rolls 12, the design of its unbroken loop astragal shape also can cause the increase of weight chain.

Based on above three reasons, the overall weight of existing metal bracelet 1 is big, be not inconsistent light-weighted principle in the design, above-mentioned defective not only makes the easy in the running and fluted disc collision generation noise of chain, for the rider, heavy chain also can cause the burden that drives, and causes the reduction of Security.

Other has a kind of as the U.S. the 4th, 863, the nonmetal chain of No. 418 invention cases, the essential structure of this nonmetal chain roughly as shown in Figure 3, also form by several serial connection unit 2 serial connections, each serial connection unit 2 all comprises two inner chain sheets 21, two outer chain sheets 22, one chain rivet 23, and two latch 24, wherein, in these, outer chain sheet 21,22 structure is identical, following elder generation explains with inner chain sheet 21, i.e. this inner chain sheet 21 long slab shape that is the two ends circular arc, the side 211 that comprises two internal and external partitions, an and perforation 212 that runs through bi-side 211, this perforation 212 have two between left and right every circular shaft pivot portion 213, and interconnecting part 214 in 213 in diaxon pivot portion, and the perforation 222 of this outer chain sheet 22 also comprises a diaxon pivot portion 223 and an interconnecting part 224, the minor diameter part 231 at interval before and after then having two sections on this chain rivet 23, an and large-diameter portion 232 that is engaged on 231 of two minor diameter parts, above-mentioned minor diameter part 231 pass respectively homonymy in, outer chain sheet 21,22 axle pivot portion 213,223, utilize latch 24 radially to pass the minor diameter part 231 of chain rivet 23 at last, be combined into this serial connection unit 2.

Though this nonmetal chain in design can be because of the formation of perforation 212,222, and alleviate the weight of chain sheet 21,22 and whole piece chain, but because inside and outside chain sheet 21,22 edges are because the only remaining very little thickness of the setting of perforation 212,222, the reinforcement equipment that is not provided with other on the chain sheet 21,22 is added in this design, therefore, generally speaking the structural strength of this nonmetal chain is relatively poor, and Security causes anxiety during use.

Also be, in known technology, though the nonmetal chain of Fig. 3 meets light-weighted design principle, but structural strength deficiency generally speaking, though and the metal bracelet structural strength of Fig. 1, Fig. 2 is good, exist the big defective of weight chain, therefore, how to make chain have enough structural strengths, also meet light-weighted design principle simultaneously, be the problem that haves much room for improvement on the chain design.

Summary of the invention

At the defective of above-mentioned prior art, the purpose of this utility model provides a kind ofly to be had under the prerequisite of enough structural strengths, reaches the chain of lightweight effect.

Chain of the present utility model is formed by a plurality of serial connections unit serial connection, and each serial connection unit all comprises: four chain sheets, chains roll and a chain rivet.Wherein these chain sheets be in twos internal and external partition and about shift to install, each chain sheet all comprises: a slice body, an and perforation that runs through the bi-side of this sheet body, wherein have on this sheet body two between left and right every the end, an and waist that is engaged between two end part, and have two corresponding with the end of sheet body respectively axle pivot portions on this perforation, and the waist of a counterpiece body and be communicated with the interconnecting part of diaxon pivot portion, and also has at least one stiffening rib that is provided with along perforation on wherein two the sheet body of four chain sheets.

And this chain to roll be to be rotatably installed between inboard two chain sheets, comprise: a ring wall, an and passage that defines by this ring wall, this ring wall has one first ring end face, one second ring end face separately, and at least one first breach toward the second ring end face axial indent is set on the first ring end face.And this chain rivet is to pass axle pivot portion axially corresponding on these chain sheets.

A kind of chain that the utility model provides, it is formed by a plurality of serial connections unit serial connection, and each serial connection unit comprises:

Two inner chain sheets, internal and external partition is provided with, each inner chain sheet all comprises: a slice body, an and interior perforation that runs through the bi-side of this sheet body, wherein have on this sheet body two between left and right every the end, and a waist that is engaged between two end part, and should in perforation have two corresponding with the end of sheet body respectively axle pivot portions, and the waist of a counterpiece body and be communicated with the interconnecting part of diaxon pivot portion;

Two outer chain sheets, internal and external partition is provided with, each outer chain sheet all comprises: a slice body, an and outer perforation that runs through the bi-side of this sheet body, wherein have on this sheet body two between left and right every the end, an and waist that is engaged between two end part, and should have two corresponding with the end of sheet body respectively pivot portions by outer perforation, and the waist of a counterpiece body and be communicated with the interconnecting part of diaxon pivot portion, and also has at least one stiffening rib that is provided with along outer perforation on this sheet body;

One chain rolls, be rotatably installed between two chain sheets, comprise a ring wall, and a passage that defines by this ring wall, the one first ring end face, the one second ring end face that have internal and external partition on this ring wall, and at least one by first breach of the first ring end face toward the second ring end face axial indent; And a chain rivet, pass axle pivot portion axially corresponding on these chain sheets.

Described chain, wherein, this chain rolls and also comprises at least one second breach by the past first ring end face axial indent of the second ring end face.

Described chain, wherein, this second breach and first breach are and shift to install.

Described chain wherein, also comprises two protruded stigmas that extend from this sheet body one on this inner chain sheet, these protruded stigmas center on the diaxon pivot portion of interior perforation and establish.

Described chain, wherein, the stiffening rib of these outer chain sheets is around the axle pivot portion of outer perforation.

Described chain, wherein, the interconnecting part of the outer perforation of the stiffening rib correspondence of these outer chain sheets.

Described chain, wherein, the waist stiffening rib that also has at least one corresponding waist on the sheet body of these inner chain sheets and be provided with along the interconnecting part of interior perforation.

Described chain, wherein, this chain rivet comprises an axial wall, and an axle track that is defined by axial wall.

Described chain, wherein, the axial wall thickness of this chain rivet is dwindled toward two axial ends gradually by central authorities.

Described chain, wherein, the waist of this outer chain sheet is by interior outstanding outward relief shape.

Described chain, wherein, the system of axle pivot portion of these inside and outside chain sheets and the coaxial setting of end axle of sheet body.

The utility model also provides another kind of chain, and it is formed by a plurality of serial connections unit serial connection, and each serial connection unit comprises:

Two inner chain sheets, internal and external partition is provided with, each inner chain sheet all comprises: a slice body, and two between left and right every and run through the interior perforation of sheet body, wherein have on this sheet body two between left and right every the end, and a waist that is engaged between two end part, perforation all has two corresponding with the end of sheet body respectively axle pivot portions in each, and two respectively toward the waist of sheet body extend in prolong scarce portion; Two outer chain sheets, internal and external partition is provided with, each outer chain sheet all comprises: a slice body, and two outer perforations that run through this sheet body, wherein have on this sheet body two between left and right every the end, an and waist that is engaged between two end part, and these outer perforations all have two corresponding with the end of sheet body respectively axle pivot portions, and two scarce portions of extensions that past respectively waist extends, and also has at least one stiffening rib that is provided with along outer perforation on this sheet body; One chain rolls, be rotatably installed between two chain sheets, comprise a ring wall, and a passage that defines by this ring wall, the one first ring end face, the one second ring end face that have internal and external partition on this ring wall, and at least one by first breach of the first ring end face toward the second ring end face axial indent; And a chain rivet, pass axle pivot portion axially corresponding on these chain sheets.

The utility model also provides a kind of chain in addition, it is formed by a plurality of serial connections unit serial connection, each serial connection unit comprises: two inner chain sheets, internal and external partition is provided with, each inner chain sheet all comprises: a slice body, and two between left and right every and run through the interior perforation of sheet body, wherein have on this sheet body two between left and right every the end, an and waist that is engaged between two end part, perforation all has two corresponding with the end of sheet body respectively axle pivot portions in each, and a scarce portion that is positioned at the waist of sheet body, the portion that lacks in this is not communicated with a pivot portion;

Two outer chain sheets, internal and external partition is provided with, each outer chain sheet all comprises: a slice body, and two outer perforations that run through this sheet body, wherein have on this sheet body two between left and right every the end, an and waist that is engaged between two end part, and these outer perforations all have two corresponding with the end of sheet body respectively axle pivot portions, and an outer scarce portion that is positioned at the waist of sheet body, this outer portion that lacks is not communicated with an axle pivot portion, and also has at least one stiffening rib along outer perforation setting on this sheet body; One chain rolls, be rotatably installed between two chain sheets, comprise a ring wall, and a passage that defines by this ring wall, the one first ring end face, the one second ring end face that have internal and external partition on this ring wall, and at least one by first breach of the first ring end face toward the second ring end face axial indent; And a chain rivet, pass axle pivot portion axially corresponding on these chain sheets.

By the chain rivet of hollow, the perforation of chain sheet, and the breach that rolls of chain, can alleviate the weight of chain, reduce the running noise of chain simultaneously, and the formation by stiffening rib, can improve the structural strength of chain sheet and improve safety in utilization, make chain when having enough structural strengths, reach light-weighted purpose.

Brief Description Of Drawings

Below in conjunction with accompanying drawing,, will make the technical solution of the utility model and beneficial effect apparent by detailed description to the utility model preferred embodiment.

In the accompanying drawing,

Fig. 1 is an a kind of not complete assembled sectional view of existing metal bracelet;

Fig. 2 is the side view of an outer chain sheet of this existing metal bracelet;

Fig. 3 is an a kind of not complete three-dimensional exploded view of existing nonmetal chain;

Fig. 4 is not complete three-dimensional exploded view of first preferred embodiment of the utility model chain;

Fig. 5 is not complete assembled sectional view of overlooking of this preferred embodiment;

Fig. 6 is not complete combination of side view of this preferred embodiment;

Fig. 7 is not complete three-dimensional exploded view of second preferred embodiment of the utility model chain;

Fig. 8 is not complete combination of side view of this preferred embodiment; And

Fig. 9 is not complete three-dimensional exploded view of the 3rd preferred embodiment of the utility model chain;

Figure 10 is not complete three-dimensional exploded view of the 4th preferred embodiment of the utility model chain.

Embodiment

Aforementioned and other technology contents, characteristics and function of the present utility model in the following detailed description that cooperates with reference to graphic preferred embodiment, can clearly be understood.

Consult Fig. 4, Fig. 5, the part of first preferred embodiment of the utility model chain all is to be made by metallic material, this chain is to be formed by a plurality of serial connections unit 3 serial connections, and each serial connection unit 3 all comprises: two inner chain sheets 31, two outer chain sheets 32, a chain roll 33, and a chain rivet 34.

These inner chain sheets 31 are internal and external partition settings, each inner chain sheet 31 all comprises: a slice body 311, one runs through the interior perforation 312 of the bi-side of this sheet body 311, and two between left and right every and in this perforation 312 and the protruded stigma 313 established, wherein this sheet body 311 have two circles and between left and right every end 314, an and waist 315 that is engaged on 314 at two end part and reduced width, and should in perforation 312 have two circles and with the axle pivot portion 316 that is coaxial setting with side end 314, and an interconnecting part 317 that is engaged on 316 in diaxon pivot portion and corresponding waist 315, on this waist 315, also have two upper and lower settings and by the interior waist stiffening rib 318 of outstanding long arc strip outward.And these protruded stigmas 313 are by the past interior extension of one on the sheet body 311, and around this pivot portion 316, all have a short slot 319 towards waist 315 on each protruded stigma 313.

The appearance profile of this outer chain sheet 32 is similar in appearance to inner chain sheet 31, each outer chain sheet 32 all comprises a slice body 321, an and outer perforation 322 that runs through the bi-side of sheet body 321, wherein have on this sheet body 321 two circles and between left and right every end 323, an and waist 324 that is engaged on 323 at two end part and reduced width, be a pivot portion 325 of coaxial setting and should outer perforation 322 have two with end 323, and one is engaged on 325 in diaxon pivot portion and the interconnecting part 326 corresponding with waist 324.In order to improve the structural strength of this outer chain sheet 32, the end reinforcing rib 327 that also has two upper and lower settings on this sheet body 321 and establish around axle pivot portion 325, and two the waist stiffening ribs 328 of position on waist 324, and this waist 324 is by interior outstanding outward relief shape.

This chain roll 33 be rotatably axle sleeve between protruded stigma 313 peripheries of two inner chain sheets 31, comprise a ring wall 331, an and passage 332 that defines by this ring wall 331, the one first ring end face 333, one second ring end face 334, three that wherein have internal and external partition on this ring wall 331 axially are arranged with and equal angular first breach 335 toward the second ring end faces 334 from the first ring end face 333, and three be arranged with and equal angular second breach 336 toward the first ring end faces 333 by the second ring end face 334, and these first and second breach 335,336 are and shift to install.

This chain rivet 34 passes the axle pivot portion 325 of two outer chain sheets 32 and the axle pivot portion 316 of inner chain sheet 31, and inside and outside chain sheet 31,32 and chain are rolled 33 serial connections, above-mentioned chain rivet 34 comprises the axial wall 341 of an annular, and an axle track 342 that defines by this axial wall 341, wherein the sectional shape and the size at each position is all identical on this axial wall 341.

Cooperate Fig. 6, the chain of present embodiment is after combination, the protruded stigma 313 of these inner chain sheets 31 all stretches into chain and rolls in 33 the passage 332 toward in, and this chain rivet 34 is to pass the axle pivot portion 325 of stretching to two outer chain sheets 32 after the axle pivot portion 316 of two inner chain sheets 31, by riveted processing the two axial ends of chain rivet 34 is outwards expanded, and with aforementioned each assemblying together.The combination back is because inside and outside chain sheet 31,32 is provided with interconnecting part 317,326, and chain rolls and is formed with first and second breach 335,336 that axially is arranged with on 33, arrange in pairs or groups the again chain rivet 34 of hollow of above-mentioned design, can alleviate the weight that respectively is connected in series unit 3, make the chain that combines by each serial connection unit 3 have light-weighted effect.At the same time, though each chain sheet 31,32 is provided with interconnecting part 317,326, but because present embodiment all is provided with outstanding waist stiffening rib 318,328 on the sheet body 311,321 of inside and outside chain sheet 31,32, and end reinforcing rib 327, therefore, each chain sheet 31,32 still has enough structural strengths, makes chain when having better structural strength, can reach light-weighted function.

Consult Fig. 7, Fig. 8, second preferred embodiment of the utility model chain is also formed by a plurality of serial connections unit 3 serial connections, each serial connection unit 3 all comprises: two inner chain sheets 31, two outer chain sheets 32, one chain rolls 33 and one chain rivet 34, wherein the structure of this inner chain sheet 31 is approximately identical to first embodiment, but the waist stiffening rib is not set, and the structure of the outer chain sheet 32 of present embodiment also is approximately identical to first embodiment, difference is: do not establish the waist stiffening rib on the outer chain sheet 32, and its end reinforcing rib 327 is single and centers on the axle pivot portion 325 of outer chain sheet 32, and this chain rivet 34 also is the hollow setting, but axial wall 341 thickness of chain rivet 34 system is by the past two axial ends attenuation gradually of central authorities, change by these part structures can reach identical effect equally.

In design, the part of first and second preferred embodiment of the utility model can exchange, for example: second embodiment's outer chain sheet 32 can be used on first embodiment's the chain, perhaps two embodiments' inner chain sheet 31 or chain rivet 34 be exchanged, perhaps be designed to chain rivet 34 solid.And the end reinforcing rib 327 on the outer chain sheet 32 also can be 3 stops or the design more than three sections except can the two-part as second embodiment's the unistage type and first embodiment.

Consult Fig. 9, the 3rd preferred embodiment of the utility model chain also comprises a plurality of serial connections unit 3, each serial connection unit 3 also comprises: two inner chain sheets 31, two outer chain sheets 32, one chain rolls 33 and one chain rivet 34, its medium chain roll 33 and the structure of chain rivet 34 identical with first embodiment, no longer explanation, and inner chain sheet 31 has a slice body 311, this sheet body 311 have two between left and right every end 314, an and waist 315 that is positioned at 314 at two end part, the utility model the 3rd preferred embodiment is with the difference of first preferred embodiment: also comprise two on this inner chain sheet 31 between left and right every the interior perforation 312 that does not communicate, perforation 312 all has one and the axle pivot portion 316 of end 314 correspondences in each, and one toward waist 315 extend in prolong perforations 312 in the portion of lacking 310, two in prolong and lack portion 310 and be not connected.And the structure of this outer chain sheet 32 is also similar in appearance to inner chain sheet 31, promptly comprise a slice body 321 on this outer chain sheet 32, and two between left and right every outer perforation 322, each outer perforation 322 all has a pivot portion 325 and an extension lacks portion 320, by two inside and outside perforations 312,322 are set on inside and outside chain sheet 31,32, and each perforation 312,322 extended prolong the portion 310,320 that lacks, can reach the effect that alleviates chain sheet 31,32 weight equally.

Consult Figure 10, the utility model the 4th preferred embodiment also includes a plurality of serial connections unit 3, each serial connection unit 3 also comprises: two inner chain sheets 31, two outer chain sheets 32, one chain rolls 33 and one chain rivet 34, its medium chain roll 33 and the structure of chain rivet 34 identical with first embodiment, no longer explanation, and inner chain sheet 31 has a slice body 311, this sheet body 311 have two between left and right every end 314, an and waist 315 that is positioned at 314 at two end part, the difference of the utility model the 4th preferred embodiment and first preferred embodiment is: also comprise on this inner chain sheet 31 two between left and right every and run through the interior perforation 312 of sheet body, in each perforation 312 all have two circles and with the axle pivot portion 316 that is coaxial setting with side end 314, and one be positioned at waist 315, and correspond to the little interior scarce portion 310 in big centre, two that waist 315 presents reduced width, the portion that lacks in this is not communicated with axle pivot portion; Also have two protruded stigmas of establishing around this pivot portion 316 that are complete circle 313, and on this waist 315, also have two upper and lower settings and the waist stiffening rib 318 of outstanding long arc strip from inside to outside.And the structure of this outer chain sheet 32 is also similar in appearance to inner chain sheet 31, promptly comprise a slice body 321 on this outer chain sheet 32, and two outer perforations 322 that run through this sheet body, each outer perforation 322 all has a pivot portion 325 and an outer portion 320 that lacks, and should lack portion 320 outward and not be communicated with, and also have at least one stiffening rib that is provided with along outer perforation on this sheet body with axle pivot portion 325.By two inside and outside perforations 312,322 are set, can reach the effect that alleviates chain sheet 31,32 weight equally on inside and outside chain sheet 31,32.

By above explanation as can be known, the utility model rolls at chain breach is set, cooperate chain sheet design to be hollow shape simultaneously with chain, mode with the outstanding stiffening rib of sheet body strengthens chain chip architecture intensity again, not only can be when not reducing chain structure intensity, reach the purpose that alleviates chain sheet weight, also can when not reducing the chain safety in utilization, reach functions such as lightweight and reduction transmission noise.

Be understandable that; for the person of ordinary skill of the art; can make various corresponding changes and distortion according to the technical solution of the utility model and technical conceive, and these all changes and distortion all should belong to the protection domain of the utility model accompanying Claim.

Claims (13)

1, a kind of chain is characterized in that, it is formed by a plurality of serial connections unit serial connection, and each serial connection unit comprises:

Two inner chain sheets, internal and external partition is provided with, each inner chain sheet all comprises: a slice body, an and interior perforation that runs through the bi-side of this sheet body, wherein have on this sheet body two between left and right every the end, and a waist that is engaged between two end part, and should in perforation have two corresponding with the end of sheet body respectively axle pivot portions, and the waist of a counterpiece body and be communicated with the interconnecting part of diaxon pivot portion;

Two outer chain sheets, internal and external partition is provided with, each outer chain sheet all comprises: a slice body, an and outer perforation that runs through the bi-side of this sheet body, wherein have on this sheet body two between left and right every the end, an and waist that is engaged between two end part, and should have two corresponding with the end of sheet body respectively pivot portions by outer perforation, and the waist of a counterpiece body and be communicated with the interconnecting part of diaxon pivot portion, and also has at least one stiffening rib that is provided with along outer perforation on this sheet body;

One chain rolls, be rotatably installed between two chain sheets, comprise a ring wall, and a passage that defines by this ring wall, the one first ring end face, the one second ring end face that have internal and external partition on this ring wall, and at least one by first breach of the first ring end face toward the second ring end face axial indent; And

One chain rivet passes axle pivot portion axially corresponding on these chain sheets.

2, chain according to claim 1 is characterized in that, this chain rolls and also comprises at least one second breach by the past first ring end face axial indent of the second ring end face.

3, chain according to claim 2 is characterized in that, this second breach and first breach are and shift to install.

According to claim 1 or 3 described chains, it is characterized in that 4, also comprise two protruded stigmas that extend from this sheet body one on this inner chain sheet, these protruded stigmas center on the diaxon pivot portion of interior perforation and establish.

5, chain according to claim 1 is characterized in that, the stiffening rib of these outer chain sheets is around the axle pivot portion of outer perforation.

6, chain according to claim 1 is characterized in that, the interconnecting part of the outer perforation of the stiffening rib correspondence of these outer chain sheets.

7, chain according to claim 1 is characterized in that, the waist stiffening rib that also has at least one corresponding waist on the sheet body of these inner chain sheets and be provided with along the interconnecting part of interior perforation.

8, chain according to claim 1 is characterized in that, this chain rivet comprises an axial wall, and an axle track that is defined by axial wall.

9, chain according to claim 8 is characterized in that, the axial wall thickness of this chain rivet is dwindled toward two axial ends gradually by central authorities.

10, chain according to claim 1 is characterized in that, the waist of this outer chain sheet is by interior outstanding outward relief shape.

11, chain according to claim 1 is characterized in that, the system of axle pivot portion of these inside and outside chain sheets and the coaxial setting of end axle of sheet body.

12, a kind of chain is characterized in that, it is formed by a plurality of serial connections unit serial connection, and each serial connection unit comprises:

Two inner chain sheets, internal and external partition is provided with, each inner chain sheet all comprises: a slice body, and two between left and right every and run through the interior perforation of sheet body, wherein have on this sheet body two between left and right every the end, and a waist that is engaged between two end part, perforation all has two corresponding with the end of sheet body respectively axle pivot portions in each, and two respectively toward the waist of sheet body extend in prolong scarce portion;

Two outer chain sheets, internal and external partition is provided with, each outer chain sheet all comprises: a slice body, and two outer perforations that run through this sheet body, wherein have on this sheet body two between left and right every the end, an and waist that is engaged between two end part, and these outer perforations all have two corresponding with the end of sheet body respectively axle pivot portions, and two scarce portions of extensions that past respectively waist extends, and also has at least one stiffening rib that is provided with along outer perforation on this sheet body;

One chain rolls, be rotatably installed between two chain sheets, comprise a ring wall, and a passage that defines by this ring wall, the one first ring end face, the one second ring end face that have internal and external partition on this ring wall, and at least one by first breach of the first ring end face toward the second ring end face axial indent; And

One chain rivet passes axle pivot portion axially corresponding on these chain sheets.

13, a kind of chain is characterized in that, it is formed by a plurality of serial connections unit serial connection, and each serial connection unit comprises:

Two inner chain sheets, internal and external partition is provided with, each inner chain sheet all comprises: a slice body, and two between left and right every and run through the interior perforation of sheet body, wherein have on this sheet body two between left and right every the end, an and waist that is engaged between two end part, perforation all has two corresponding with the end of sheet body respectively axle pivot portions in each, and a scarce portion that is positioned at the waist of sheet body, the portion that lacks in this is not communicated with a pivot portion;

Two outer chain sheets, internal and external partition is provided with, each outer chain sheet all comprises: a slice body, and two outer perforations that run through this sheet body, wherein have on this sheet body two between left and right every the end, an and waist that is engaged between two end part, and these outer perforations all have two corresponding with the end of sheet body respectively axle pivot portions, and an outer scarce portion that is positioned at the waist of sheet body, this outer portion that lacks is not communicated with an axle pivot portion, and also has at least one stiffening rib along outer perforation setting on this sheet body;

One chain rolls, be rotatably installed between two chain sheets, comprise a ring wall, and a passage that defines by this ring wall, the one first ring end face, the one second ring end face that have internal and external partition on this ring wall, and at least one by first breach of the first ring end face toward the second ring end face axial indent; And

One chain rivet passes axle pivot portion axially corresponding on these chain sheets.

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