TW201414644A - Bicycle chain tensioning device - Google Patents

Abstract

A bicycle chain tensioning device is fixed to a bottom bracket and comprises a fixing piece, a first link pivoted to the fixing piece, a second link pivoted to the fixing piece, a third link pivotally connected between the first and the second links, an elastic piece connected between the first and the second links, and a supporting piece mounted to the third link. The tensioning device provides tension to the chain and is suitable for preventing the chain from falling in a folding operation for folding the bicycle.

Description

Bicycle chain tensioning device

The present invention relates to a bicycle accessory, and more particularly to a vehicle chain staying device.

In order to prevent the chain from falling off, a general bicycle is often provided with a chain guide or a device for providing tension of the chain.

For example, the guide chain structure of TW publication No. 522973 includes a guide chain body and a plurality of idler sets mounted on the guide chain body. The guide chain body has two wings, and each of the wings is mounted with a large and small one. The idler wheel can be used to guide the chain and prevent the chain from falling off by using the large and small idlers to be arranged inside and outside the chain.

Although the above-mentioned chain structure can achieve the purpose of preventing the chain from falling off, the chain structure cannot generate elastic force to fix the chain tension.

In addition, the anti-dropper of TW M396254 is suitable for a folding bicycle, which is provided with two supporting bodies on a V-shaped bracket, and the supporting bodies are respectively disposed inside and outside the chain, and the anti-dropper is respectively arranged. In the normal riding state of the bicycle, there is no function, only when the frame is longitudinally folded (that is, a rear fork is rotated downwards correspondingly to the extending direction of the frame, and then pivoted relative to a front fork) The use of the anti-dropper can maintain a large tension around the chain on the chain and produce better positioning, and can prevent the chain from falling off the chain when it is to be deployed again next time.

However, the anti-dropper is in a fixed state, and when the frame is folded, if the tension of the chain bypassing the support is too large, the support is bypassed by the chain. It is easy to generate a large force. If the tension of the chain around the support is too small, the chain may still be loose.

Accordingly, it is an object of the present invention to provide a bicycle chain staying device which can provide a tension of a chain in a normal riding state and prevent the chain from falling off when the folding bicycle is folded.

Therefore, the bicycle chain tensioning device of the present invention is fixed to a five-way pipe and includes a fixing member, a first connecting rod, a second connecting rod, a third connecting rod, an elastic member and a supporting member. The fixing member has a first pivoting portion disposed outside the five-way pipe and a second pivoting portion disposed outside the five-way pipe and spaced apart from the first pivoting portion, the first link has a first pivot end of the first pivoting portion and a first swing end opposite to the first pivot end, the second link having a first pivotal connection at the second pivoting portion a second pivot end and a second swing end opposite to the second shaft end, the third link is pivotally connected between the first swing end and the second swing end, and the elastic member is implicated in the first The elastic force between the connecting rod and the second connecting rod keeps the second swinging end constantly approaching toward the first swinging end, and the supporting member is disposed on the third connecting rod.

The effect of the invention is that the first and second pivot ends of the first and second links are respectively pivotally connected to the first and second pivoting portions, and the third connecting rod and the elastic member are disposed normally. In the riding state, the tension of the chain can be provided. When applied to the folding car, the chain can be prevented from falling off during the folding operation.

The foregoing and other technical content, features and effects of the present invention are The detailed description of a preferred embodiment of the present invention will be apparent from the following description.

As shown in FIG. 1 , FIG. 4 and FIG. 5 , a preferred embodiment of the bicycle chain tensioning device of the present invention is fixed to a five-way pipe 200 corresponding to a chain plate 100 , and a chain 300 is wound around the chain plate 100 . The pulling device comprises a fixing member 10, a first connecting rod 20, a second connecting rod 30, a third connecting rod 40, an elastic member 50 and a supporting member 60. As shown in FIG. 4 and FIG. 5 , the embodiment is a folding bicycle. The five-way pipe 200 is fixed to the bottom of a front frame 110 , and a rear frame 120 is pivotally connected to the rear of the front frame 110 . .

Referring to FIG. 2 and FIG. 3 , the fixing member 10 has a hollow ring shape and has a first ring piece 11 in an arc shape, a second ring piece 12 pivotally connected to the first ring piece 11 , and a first ring piece 12 . a lock 13 that is locked between the first and second ring pieces 11 and 12, a first pivoting portion 14 disposed outside the five-way pipe 200, and a first portion disposed outside the five-way pipe 200 and the same a second pivoting portion 15 is disposed at a distance from the pivoting portion 14 . The first and second ring segments 11 and 12 are respectively disposed outside the five-way tube 200 . The first ring piece 11 has a first end 111 . The second ring piece 12 has a second end 121 opposite to the first end 111. The locking member 13 is locked to the first and second ends 111 and 121. The first and second pivoting portions 14 and 15 are disposed at The first ring piece 11.

The first connecting rod 20 has a first pivot end 21 pivotally connected to the first pivoting portion 14 , a first swing end 22 opposite to the first shaft end 21 , and a first shaft disposed on the first shaft The first connecting portion 23 on the inner side of the terminal end 21.

The second link 30 has a second pivot end 31 pivotally connected to the second pivot portion 15 , a second swing end 32 opposite to the second shaft end 31 , and A second connecting portion 33 disposed inside the second swing end 32.

The third link 40 is pivotally connected between the first swing end 22 and the second swing end 32, and has a first pivoting portion 41 pivotally connected to the first swing end 22, and is pivotally connected thereto. The second pivoting portion 42 of the second swinging end 32 and a positioning portion 43 disposed on the first pivoting portion 41 and the second pivoting portion 42 side.

The elastic member 50 of the present embodiment is a tension spring and is interposed between the first link 20 and the second link 30 and has a first connection portion 23 connected to the first link 20 An end 51 and a second end 52 connected to the second connecting portion 33 of the second connecting rod 30, the first end 51 is adjacent to the first pivot end 21, and the second end 52 is adjacent to the The second oscillating end 32 has a spring force that keeps the second oscillating end 32 constant toward the first oscillating end 22.

The support member 60 is disposed in the shape of a guide wheel and is disposed on the third link 40. The support member 60 of the embodiment is mounted on the positioning portion 43.

As shown in FIG. 4 and FIG. 5, the folding bicycle is displayed in a normal riding state, and referring to FIG. 2 and FIG. 3, when the supporting device is fixed to the five-way pipe 200 by using the fixing member 10, When the support member 60 is suspended below the chain plate 100 and corresponding to the chain 300, the first connection portion 23 of the first link 20 and the second link 30 are connected by the elastic member 50. Between the portions 33, and the elastic force of the elastic member 50, the second oscillating end 32 is kept in a tendency to approach the first oscillating end 22, and the support member 60 can be used to provide the chain 300 in normal riding. Maintaining proper tension while riding the state prevents the chain 300 from coming off.

As shown in FIG. 6 and FIG. 7 , when the rear frame 120 pivots downward and is folded toward the bottom of the front frame 110, the first frame can be pushed while pivoting with the rear frame 120. The lever 20 is pivoted, except that the chain 300 is pulled around the entire circumference of the chain 100, and the second link 30 is simultaneously pivoted by the third link 40, so that the first The distance between the two connecting rods 20, 30 is increased. At this time, the first and second ends 51, 52 of the elastic member 50 are also stretched outward, and the elastic force is released, and the supporting member 60 is caused. The elastic force of the elastic member 50 is applied to the chain 300, so that the force of the chain 300 around the support member 60 is not excessive, and the chain 300 can be prevented from being loosened. .

Therefore, the tensioning device of the present invention can be applied to a folding bicycle in addition to a bicycle suitable for a general fixed frame, and can provide a tension of a chain when mounted on a bicycle of a fixed frame. When installed on a folding bicycle and folded, it prevents the chain from coming off.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

100‧‧‧Chassis

200‧‧‧5-way pipe

300‧‧‧Chain

110‧‧‧ front frame

120‧‧‧ rear frame

10‧‧‧Fixed parts

11‧‧‧ First ring

111‧‧‧ first end

12‧‧‧second ring

121‧‧‧second end

13‧‧‧Locker

14‧‧‧First pivotal

15‧‧‧Second pivotal

20‧‧‧First Link

21‧‧‧First axis pivot

22‧‧‧First swing end

23‧‧‧First connection

30‧‧‧second connecting rod

31‧‧‧Second axis pivot

32‧‧‧Second swing end

33‧‧‧Second connection

40‧‧‧ Third Link

41‧‧‧First pivoting

42‧‧‧Second pivoting

43‧‧‧ Positioning Department

50‧‧‧Flexible parts

51‧‧‧ first end

52‧‧‧ second end

60‧‧‧Support

1 is a perspective exploded view of a bicycle chain struting device of the present invention; FIG. 2 is a perspective view of a preferred embodiment of the present invention; FIG. 3 is a preferred embodiment of the present invention. One combined sectional view; FIG. 4 is a schematic view showing the installation of the above preferred embodiment of the present invention, illustrating FIG. 5 is a partially enlarged schematic view of FIG. 4; FIG. 6 is a partially enlarged schematic view of the preferred embodiment of the present invention; and FIG.

10‧‧‧Fixed parts

11‧‧‧ First ring

111‧‧‧ first end

12‧‧‧second ring

121‧‧‧second end

13‧‧‧Locker

14‧‧‧First pivotal

15‧‧‧Second pivotal

20‧‧‧First Link

21‧‧‧First axis pivot

22‧‧‧First swing end

23‧‧‧First connection

30‧‧‧second connecting rod

31‧‧‧Second axis pivot

32‧‧‧Second swing end

33‧‧‧Second connection

40‧‧‧ Third Link

41‧‧‧First pivoting

42‧‧‧Second pivoting

43‧‧‧ Positioning Department

50‧‧‧Flexible parts

51‧‧‧ first end

52‧‧‧ second end

60‧‧‧Support

Claims (5)

A bicycle chain tensioning device is fixed to a five-way pipe and comprises: a fixing member having a first pivoting portion disposed outside the five-way pipe and a first portion disposed outside the five-way pipe and the first a second pivoting portion of the pivoting portion; a first connecting rod having a first pivot end pivotally connected to the first pivoting portion and a first swing end opposite to the first pivot end a second link having a second pivot end pivotally connected to the second pivot portion and a second swing end opposite to the second shaft end; a third link pivotally connected thereto Between the first oscillating end and the second oscillating end; an elastic member interposed between the first link and the second link, the elastic force of which keeps the second oscillating end constant toward the first oscillating end a near trend; and a support member disposed on the third link. The bicycle chain tensioning device according to claim 1, wherein the elasticity is a tension spring, and has a first end coupled to the first link and a second link coupled to the second link. The second end is adjacent to the first pivot end, and the second end is adjacent to the second swing end. The bicycle chain tensioning device according to claim 1, wherein the fixing member has a hollow ring shape. The bicycle chain struts according to claim 3, wherein the fixing member further has a first ring piece, a second ring piece pivotally connected to the first ring piece, and a lock The lock between the first and second ring pieces The first and second ring pieces are respectively disposed outside the five-way pipe, the first ring piece has a first end, and the second ring piece has a second end opposite to the first end, the fastener The first and second pivoting portions are disposed at the first and second ends, and the first and second pivoting portions are disposed on the first ring piece. The bicycle chain struts according to the first aspect of the invention, wherein the third link has a first pivoting portion pivotally connected to the first oscillating end and a second pivoting end to the second oscillating end. a pivoting portion and a positioning portion disposed on the first pivoting portion and the second pivoting portion, the support member being mounted on the positioning portion.