JPH0559015U - Bicycle chain connecting pin - Google Patents

Abstract

(57) [Summary] [Purpose] When connecting the chain 20 endlessly, the connecting pin 10 should not fall out of the chain 20. [Structure] A first collar portion 11, a large-diameter portion 11a, a second collar portion 12, and a cutout portion 13 are provided, and the large-diameter portion 11a has a strong interference fit with a pin hole 21a of an outer plate 21, Second
The collar portion 12 is plastically deformable to a diameter sufficiently larger than the pin hole 21a. The excision portion 13 has a tubular shape and can be broken off via the notch ring 10c by pushing in a rod-shaped tool from the tip. The second flange 12 has a recess in the axial direction, and a tool is pushed into the recess to radially expand.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connecting pin of a bicycle chain for endlessly connecting a long strip-shaped bicycle chain.

[0002]

[Prior Art]

 A bicycle chain (hereinafter, simply referred to as a chain) is generally formed into a long strip when shipped from a chain manufacturer, and is endlessly connected by a bicycle manufacturer when being incorporated in a bicycle. Is normal. Therefore, the chain manufacturer ships with a special connecting pin attached to the chain before connection, and the bicycle manufacturer uses this connecting pin to connect the chain endlessly.

As a connecting pin A used for such a purpose, there is known one in which a flange portion A1a is formed at one end of a shaft portion A1 and a cut portion A2 is formed at the other end portion (FIG. 9). This connects the outer plates CH1 and CH1 at one end of the chain CH and the inner plates CH2 and CH2 at the other end with the roller CH3, and the cutout portion A2 is connected to the outer plates CH1 and CH1. In order to facilitate press-fitting into the pin holes CH1a, CH1a, the tip portion is formed in a tapered shape, and after connecting the chain CH, it can be broken off via the notch ring A3. The collar portion A1a has a diameter sufficiently larger than the pin hole CH1a. A small-diameter collar portion A1b is formed on the side of the cut portion A2 of the shaft portion A1, but the collar portion A1b is formed in a strong interference fit with the pin hole CH1a.

[0004]

[Problems to be solved by the device]

 According to such a conventional technique, when the chain CH is connected by the connecting pin A, the collar portion A1b is press-fitted into the pin holes CH1a, CH1a and has to pass through the pin holes CH1a, CH1a, so that the diameter thereof is the collar. There is a serious drawback in that the connecting pin A is limited to a small size with respect to the portion A1a, and therefore the connecting pin A may fall off from the chain CH during use.

In view of the above-mentioned drawbacks of the prior art, the object of the present invention is to provide a large interference between one end of the shaft portion and the large diameter first collar portion and the pin hole of the outer plate. The connecting pin of the bicycle chain that has no danger of falling off during use by forming a diameter part and a second flange part that is plastically deformable to a diameter larger than the pin hole at the other end. To provide.

[0006]

[Means for Solving the Problems]

 In order to achieve such an object, the structure of the present invention is such that, at one end of the shaft portion, a first collar portion having a diameter larger than that of the pin hole of the outer plate, and adjacent to the first collar portion, A second part that forms a large-diameter portion that is a strong interference fit with respect to the other end and that has a tight fit with the pin hole of the outer plate at the other end and that is plastically deformable to a larger diameter than the pin hole of the outer plate The large diameter portion has a width corresponding to the thickness of the outer plate, and the distance between the first and second flange portions is equal to the outer surface distance of the outer plate. The summary will be used.

It should be noted that a recess in the axial direction can be formed in the second flange portion.

In addition, a breakable tubular cutout portion that is continuous with the second flange portion may be attached via a cut ring, and further, an axial slit may be formed in the cutout portion. Good.

[0009]

[Action]

 With such a configuration, when connecting the chains, first, the connecting pin is inserted into the pin hole of the one outer plate from the side of the second flange portion, and the whole is press-fitted. The second flange portions are located on both outer sides of each outer plate, and the large-diameter portion corresponds to the pin hole of the outer plate on the press-fitted side. At this time, since the large-diameter portion has a strong interference fit with the pin hole, the connecting pin as a whole can be integrally assembled with the chain. Therefore, after that, the second brim portion may be plastically deformed to have a sufficiently large diameter with an appropriate tool to complete the chain connection.

When a recess in the axial direction is provided in the second flange, a tool is pushed into the recess to expand the second flange in the radial direction, and the second flange can be easily plasticized. It can be transformed.

By providing a continuous cutting portion on the second flange portion, the cutting portion can be used as a guide when inserting the connecting pin into the pin hole. After the press-fitting of the whole, the excised part is deformed so as to expand in the radial direction by pushing in a rod-shaped tool with a diameter larger than the inner diameter of the excised part from the tip, and finally through the notch ring. It can be easily torn off. At this time, the tool for removing the cut portion can be shared with the tool for plastically deforming the second collar portion.

If a slit is formed in the excision portion, the excision portion can be easily deformed through the slit, and therefore can be removed more easily.

[0013]

【Example】

 Hereinafter, embodiments will be described with reference to the drawings.

The connecting pin 10 of the bicycle chain has a first collar 11 with a large diameter portion 11a formed at one end of a shaft 10a, and a second collar 12 and a cutout at the other end. And 13 (FIG. 1).

The chain 20 is generally formed by alternately connecting a pair of outer plates 21, 21 and inner plates 22, 22 via pins 23, 23 ... (FIG. 2), and the outer plates 21, 21. A roller 24 is attached to each connecting portion of the inner plates 22, 22 via the embossed portions 22a, 22a of the inner plates 22, 22. Since the chain 20 is shipped in a long strip shape, the inner plates 22 and 22 at the other end are inserted between the outer plates 21 and 21 forming one end of the chain 20 (two-dot chain line in the figure) to The connecting pin 10 is press-fitted into the pin holes 21a, 21a of the plates 21, 21 (in the direction of arrow A in the figure) to endlessly connect the chain 20. The embossed portions 22a, 22a of the inner plates 22, 22 corresponding to the pin holes 21a, 21a generally have an inner diameter slightly larger than the diameter d of the pin holes 21a, 21a.

In the connecting pin 10, the diameter d1 of the first collar portion 11 is sufficiently larger than the diameter d of the pin holes 21a, 21a of the outer plates 21, 21 (FIG. 1). Further, the first flange portion 11 is formed with a shallow tapered recess 11b in the axial direction.

The large diameter portion 11a is formed adjacent to the first collar portion 11, and its diameter d1a is a strong interference fit with respect to the diameter d of the pin holes 21a, 21a. The width w of the large diameter portion 11a is equivalent to the thickness t of the outer plate 21 (FIG. 2).

The diameter d2 of the second flange 12 is an interference fit with the diameter d of the pin holes 21a, 21a (FIG. 1). Further, the distance L between the first flange portion 11 and the second flange portion 12 is equivalent to the outer surface distance D of the outer plates 21, 21 (FIG. 2).

The cutout portion 13 is formed so as to be continuous with the second flange portion 12 via a sharp cut ring 10c (FIG. 1). The cutout portion 13 has taper portions 13a and 13b at the tip and the base portion, and is formed into a tubular shape by forming a hole 13c in the axial direction. The diameter d3 of the cut portion 13 is sufficiently smaller than the diameter d of the pin holes 21a, 21a. A recess 12a is formed in the second flange 12 in the axial direction so as to extend the hole 13c.

In order to connect the chain 20 endlessly, the inner plates 22, 22 at the other end are inserted between the outer plates 21, 21 at one end (FIG. 3), and the pin holes 21 a of the one outer plate 21 are inserted. , The cutting portion 13 of the connecting pin 10 is inserted. At this time, since the diameter d3 of the excision portion 13 is sufficiently smaller than the diameter d of the pin hole 21a, the connecting pin 10 can be easily inserted by, for example, a fingertip operation.

Next, pressure is applied in the direction of arrow A in FIG. 3 to press the entire length of the connecting pin 10 into the pin holes 21a 1 and 21a 2 (FIG. 4). At this time, the second flange portion 12 can pass through the pin holes 21a, 21a and be located on the outer surface of the other outer plate 21, and the cutout portion 13 projects to the outside of the outer plate 21. .. The large-diameter portion 11a corresponds to the pin hole 21a on the side where the connecting pin 10 is inserted, and the large-diameter portion 11a and the pin hole 21a have a strong interference fit. The chain 20 is assembled integrally.

Subsequently, a rod-shaped tool F having a diameter slightly larger than the inner diameter of the hole 13c is pushed into the cutout portion 13 (direction of arrow B in FIG. 5). The tip of the tool F has a tapered shape. When the tool F advances, the cutout 13 is deformed so as to be expanded by the tool F in the radial direction, and when the stress limit is exceeded, the cutout 13 is broken off via the notch ring 10c and the second collar 12 is cut off. It can be separated and removed.

When the tool F is further advanced and its tip is pushed into the recess 12a (FIG. 6), the second flange 12 is plastically deformed in the radial direction to have a diameter sufficiently larger than the pin hole 21a. You can That is, in the connecting pin 10, the first flange portion 11 and the second flange portion 12 are sufficiently larger in diameter than the diameter d of the pin holes 21a, 21a, and the large diameter portion 11a is larger than the pin hole 21a. Due to the strong interference fit, the chain 20 can be firmly assembled and the connection of the chain 20 can be completed.

The diameter da of the shaft portion 10a may also be an interference fit with the pin holes 21a, 21a.

[0025]

[Other Examples]

 The connecting pin 10 may be shipped temporarily attached to one end of the chain 20 (FIG. 7). However, here, the connecting pin 10 is to be lightly press-fitted into the pin hole 21a of the one outer plate 21 and then the cutout portion 13 is removed. Further, the connecting pin 10 at this time may be temporarily assembled to the pin hole 21a by the shaft portion 10a as shown in the drawing, but the second plate is used so that the inner plates 22 and 22 can be inserted more easily. The collar portion 12 may be temporarily assembled so that it does not project to the inner surface of the outer plate 21.

Axial slits 13d and 13d can be formed in the excision portion 13 (FIG. 8). The slits 13d and 13d are assumed to reach the notch ring 10c, and when the tool F is pushed into the hole 13c to break off the cut portion 13, the cut portion 13 is likely to be deformed. It can be greatly simplified. The number of the slits 13d may be two or more, and the arrangement thereof can be arbitrarily determined regardless of the illustration.

In the above description, the cutout portion 13 serves as a guide when the connecting pin 10 is inserted into the pin hole 21a. Therefore, the excision portion 13 can be omitted when the connecting pin 10 can be accurately inserted into the pin hole 21a by using an appropriate insertion tool.

[0028]

[Effect of the device]

 As described above, according to the present invention, the first collar portion, the large diameter portion that provides a strong interference fit with the pin hole of the outer plate, and the plastic deformable portion that is sufficiently larger in diameter than the pin hole. By providing the second flange portion, since there is a large-diameter portion in addition to the first and second flange portions, it is possible to firmly attach the outer plate to the outer plate. It has the excellent effect that there is no danger of it falling out of the chain.

[Brief description of drawings]

1 is an explanatory diagram of the overall configuration

[Fig. 2] Schematic diagram of chain structure

[Fig. 3] Mounting sequence explanatory diagram (1)

FIG. 4 is a diagram illustrating a mounting sequence (2)

[Fig. 5] Attachment sequence explanatory diagram (3)

FIG. 6 is an explanatory view of the mounting sequence (4)

FIG. 7 is a temporary assembly diagram showing another embodiment.

FIG. 8 is an explanatory view of main parts showing another embodiment.

9 is a view corresponding to FIG. 4 showing a conventional example.

[Explanation of symbols]

 w ... width L ... interval t ... thickness D ... outer surface distance 10 ... connecting pin 10a ... shaft 10c ... cut ring 11 ... first flange 11a ... large diameter part 12 ... second flange 12a ... recess 13 ... cutting Part 13d ... Slit 20 ... Chain 21 ... Outer plate 21a ... Pin hole

Claims (4)

[Scope of utility model registration request] 1. A first collar portion having a diameter larger than that of the pin hole of the outer plate at one end of the shaft portion, adjacent to the first collar portion, and having a strong interference fit with the pin hole of the outer plate. And a second flange portion that is plastically deformable to a larger diameter than the pin hole of the outer plate, and is formed on the other end portion by interference fit with the pin hole of the outer plate. The bicycle chain, wherein the large diameter portion has a width corresponding to the thickness of the outer plate, and the distance between the first flange portion and the second flange portion corresponds to the outer surface distance of the outer plate. Connecting pin. 2. The connecting pin for a bicycle chain according to claim 1, wherein a recess in the axial direction is formed in the second flange portion. 3. The bicycle chain connection according to claim 1 or 2, further comprising a tubular cutout portion which is continuous and can be attached to the second flange portion via a notch ring. pin. 4. The connecting pin for a bicycle chain according to claim 3, wherein the cutout portion is formed with an axial slit.