JPH0649955Y2 - Chain connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a chain, and more particularly to a connecting portion of the chain.

2. Description of the Related Art Chains are widely used as chain transmissions in bicycles and motorcycles. A conventional chain is shown in FIGS. 4 and 5, but the chain has a plurality of pairs of inner plates I and a plurality of pairs of outer plates O, and the inner plates I and the outer plates O alternate with each other. Are placed together and connected together. A pair of bushes B is connected between each pair of inner plates I, and a roller R is rotatably provided on each bush B. A pin P is inserted through each bush B and is attached between the pair of outer plates O. Both ends of each pin P are outer plates O
It projects further outward. Further, the end portion of the pin P has a disc shape so that the inner plate I and the outer plate O are connected together.

If the end portion of the pin P projects in this way, it will have an adverse effect during gear shifting of a bicycle equipped with a multi-stage transmission.

Accordingly, it is an object of the present invention to provide a chain linkage having a flat outer surface and no protrusions.

Other objects and advantages of the present invention will become more apparent in the detailed description of the present invention given below.

Means for Solving the Problems The above object is achieved by the connecting portion of the chain according to the present invention. In summary, the present invention comprises a plurality of pairs of inner plates and a plurality of pairs of outer plates, which are alternately connected; each said inner plate comprises two first rings integrally formed, each said first plate. A first annular flange is formed in the center of the ring so as to be substantially perpendicular to the inner plate; each outer plate is provided with two second rings integrally formed with each other. A second annular flange is formed in the center of the second ring so as to be substantially perpendicular to the outer plate, and the width of each of the second annular flanges is the second annular flange. Configured to taper toward the free edge of the flange; the inner surface at the opposite end of the free edge of each said first annular flange is rounded to form a first recess, and , The inner surface of each said second annular flange opposite the free end edge is rounded to form a second recess; A pair of rollers are rotatably carried between the inner plates formed and around the first annular flange of the inner plate; each second annular flange of the outer plate being in the corresponding first recess. Received in the first recess and engaging the first recess; a pin having recesses at both ends is aligned with the pair of the first annular flange and the first annular flange. Corresponding pair of said second
Through the annular flange of the pin and then deforming both ends of the pin to expand into the second recess.
Engaging the recesses of the pin so that the ends of the pin are substantially embedded in the outer plate and the outer surface of the outer plate is flat and free of protrusions. It is a characteristic chain connecting part.

Embodiment Next, the connecting portion of the chain according to the present invention will be described in more detail with reference to the drawings.

First, referring to FIGS. 1 and 2, a portion of a chain according to the present invention is illustrated. The chain generally has a pair of outer plates 1 and a pair of inner plates 2, and the chain is formed by alternately connecting the outer plates 1 and the inner plates 2. Each of the outer plate 1 and the inner plate 2 is formed into a substantially bone shape, or is formed by substantially attaching two rings 10 and 20 together. Each ring 10, 20 has an annular flange that is substantially perpendicular to the ring 10, 20.
Have 11 and 21. The opposite end of the free edge of each annular flange 11, 21 is rounded on its inner surface to form a recess 12, 22.

The outer peripheral surface of the annular flange 11 is an inclined surface. That is, the width of the annular flange 11 is reduced towards the free edge of the flange 11, so that the annular flange 11 can be received in the recess 22 of the corresponding annular flange 21. Therefore, the inner surfaces of the annular flanges 11 and 21 are aligned.

Two rollers 3 which are cylindrical, each pair of inner plates 2
It is rotatably supported between them and around the annular flange 21.

Recesses 41 and 42 are formed at both ends of the pin 4. The outer diameter of the pin 4 is equal to or somewhat smaller than the inner diameter of the annular flanges 11, 21 so that the pin 4 can
It can be inserted into 21. Alternatively, the pin 4 could be a cylindrical tube.

Next, referring to FIG. 3, the pin 4 is inserted through the annular flanges 11 and 21 of the pair of inner plates 2 and the pair of outer plates 1. Both ends of the pin 4 are pressed, i.e. deformed and expanded, thereby engaging the recess 12 of the outer plate 1.
Both ends of the pin 4 are substantially embedded inside the outer plate 1, so that the outer surface of the outer plate 1 is flattened and free of any protrusions.

Advantageous Effects of Invention The connecting portion of the chain according to the present invention configured as described above has no protrusion and is flat, and therefore, it is particularly suitable for use in a bicycle equipped with a speed change gear device.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a chain according to the present invention. 2 is a partial cross-sectional view of the chain of FIG. 1 with the outer plates separated. FIG. 3 is a partial cross-sectional view of the connecting portion of the chain of FIG. FIG. 4 is an exploded perspective view of a conventional chain. FIG. 5 is a partial cross-sectional view of the chain of FIG. 1: Outer plate 2: Inner plate 3: Roller 4: Pin 10, 20: Ring 11, 21: Annular flange 12, 22: Recess

Claims (1)

[Scope of utility model registration request] 1. A plurality of pairs of inner plates and a plurality of pairs of outer plates that are alternately connected; each of the inner plates includes two first rings integrally formed with each other. The center part is substantially perpendicular to the inner plate
Forming an annular flange; each said outer plate comprises two integrally formed second rings, the central portion of each said second ring being substantially perpendicular to said outer plate A second annular flange is formed, and the width of each second annular flange is configured to gradually decrease toward the free edge of the second annular flange; The inner surface of the opposite end of the free end edge of the annular flange is rounded to form a first recess, and the inner surface of the opposite end of the free end edge of each said second annular flange is rounded. Forming a second recess;
A pair of rollers are rotatably carried between each pair of inner plates and around the first annular flange of the inner plate; each second annular flange of the outer plate corresponding to the corresponding first annular flange. A first annular flange and a first annular flange which are paired with a pin having a recess formed at both ends, the pin being received in the first concave portion and engaging with the first concave portion; Is inserted through the corresponding second pair of annular flanges aligned with each other, and then both ends of the pin are deformed to expand into the second recess. Engaging in a recess such that both ends of the pin are substantially embedded in the outer plate and the outer surface of the outer plate is flat and free of protrusions. And the connecting part of the chain.