JPS5811674Y2 - bicycle chain - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in chains used for bicycles.

If you observe the chain while driving your bicycle, you will notice that the chain swings from side to side and meanderes as it moves.

For this reason, in a bicycle equipped with a conventional chain, as shown in Figs. The tip d of the roller link plate C catches on a part of the tooth tip e of the large gear a, rides on the tooth tip e (this point is indicated by A), and then immediately There is a phenomenon in which the above-mentioned hook comes off and the part of chain b that rides on falls to a predetermined position.

Therefore, this phenomenon causes an unpleasant noise and also causes a defect that the large gear a and the chain b wear out quickly.

Also, I fell into a variable speed bicycle equipped with a multi-stage freewheel f,
As shown in Fig. 9, the chain b is connected to a multi-stage freewheel f.
When the chain is engaged with the outermost gear g, the chain running line L comes very close to the gear h that is one step inside the outermost gear g.

When set like this, reverse the pedal and chain b
When running in the opposite direction, as shown in FIG. Since the tooth tip j of the outermost gear g enters into the outermost gear g, and the entire chain b is deflected in the inner direction Q, part k of the pin link plate i becomes easily caught on the teeth m of the inner gear h, and this As a result, the chain B is released against the driver's will.
There was also a defect in that the gear was replaced with the inner gear h.

In addition, as a method proposed to correct the above-mentioned defects of conventional general bicycle chains, for example, Utility Model Application No. 52-15825
There are two types of roller chains.This roller chain has the middle parts of the outer links projecting inward from each other over their entire vertical width, so that the inner gap between the opposing outer links is the same as the inner gap between the inner links. This corrects the drawback that when a conventional chino is changed to a gear or separated from a gear, a part of the chino shifts to one side of the gear teeth, causing gear noise. It is intended to.

However, although the roller chain described above can correct the above-mentioned drawbacks, it also has a new drawback in that the speed change performance of the chain deteriorates.

In other words, when the chain is attached to a gear and does not change, the tooth tip of the gear comes to be inserted between a pair of outer links (bin link plates), but in the above roller chain, the outer link Since the inner spacing of the (pin link plates) is narrower than conventional ones over the entire width of the link in the vertical direction, the tips of the gear teeth can be smoothly inserted between the narrowed outer links (pin link plates). In order to change the engagement of the chain by moving the transmission in, it is necessary to guide the chain by moving the transmission in the direction of the hub shaft or crankshaft to a greater extent than in the past.

In other words, simply operating the transmission to the same extent as when using a conventional chenno will not reliably change the chenno into gear.

The purpose of this invention is to simultaneously solve the above-mentioned drawbacks of the conventional general bicycle chain and the drawbacks of the roller chain of Utility Model Application No. 52-158252. By pressing a button at the approximately central part of the pin link plate and applying a compression process to a part of the outer surface of the pin link plate, a hemispherical, truncated conical, or truncated pyramid shaped inward protrusion is formed on a part of the inner surface. It is characterized by the fact that it has been formed.

The present invention will be specifically described below based on embodiments shown in the drawings.

The embodiment of the present invention shown in FIG. 1 and FIG.
, 3, to be more specific, it is approximately the center of each pin link plate 1 (the length in the left and right direction and the length in the long axis direction), and is long in the top and bottom and is perpendicular to the long axis, dividing it into two. At the portion 4, which is also approximately the center of the short axis (length of the short axis), a hemispherical or truncated conical protrusion 5 is formed on a portion of the inner surface 2 by suppressing a portion of the outer surface of the pin link plate 1. was formed.

It is preferable that the protrusion length H of the protrusion 5 is slightly smaller than or approximately the same as the thickness N of the roller link plate 3.

The embodiment of the present invention shown in FIGS. 3 and 4 is basically formed the same as the above-mentioned embodiment, except that the shape of the protrusion 5 is a truncated quadrangular pyramid shape, and the pin link plate 1 is It is characterized by being formed by folding the inside of the center of the upper and lower edges 6, 6 into a crescent shape.

7 is a roller, and 8 is a pin. Since the present invention has the above configuration, it is possible to eliminate the defects of the conventional example caused by meandering of the chain.

That is, according to the present invention, as shown in FIG. 5, the left and right deviation of the chain, for example, the deviation in the outer direction P, can be suppressed within a certain range by the protrusion 5 coming into contact with the large gear a. The tip 9 of the roller link plate 3 is connected to the large gear a.
By catching on the tooth tip e, it is possible to prevent a part of the chain from riding on the tooth tip e, thereby eliminating unpleasant noise and reducing wear on the large gear and chain. be able to.

Furthermore, the present invention can eliminate the defects of the prior art that occur when reversing a variable speed bicycle.

That is, according to the present invention, even when the chain is meshed in the state shown in FIG. 9 and is run in the reverse direction, the teeth of the outermost gear g are in the space B as shown in FIG. It is possible to prevent the tip j from entering by the protrusion 5, and as a result, the amount of deviation of the chain in the inward direction Q is reduced, and a part of the pin link plate 1 is caught on the teeth m of the inner gear h. Therefore, it is possible to correct the conventional drawback that the chain is changed to the inner gear h against one's will.

Furthermore, the present invention also has the following unique effects.

That is, the inward protrusion 5 of the present invention is provided at a location approximately at the center of the pin link plate 1 in its horizontal length as well as at the center of its vertical length, as described above, and its shape is Since it is constructed in the shape of a hemisphere, a truncated cone, or a truncated pyramid, the spacing between the lower edges 6, 6 of the pin link plate 1 is wide like a conventional general chain, so that the chain does not hang on the gear. When the gear is about to be changed, the tips of the teeth of the gear tend to enter the gap between the lower edges of the pin link plate 1, and the tips of the teeth that have entered the gear are then guided by the sloping side surfaces of the inward protrusions and are connected to the pair of pin links. plate 1,
It is located in the middle of 1.

Therefore, unlike the roller chain of the above-mentioned Japanese Utility Model Application Publication No. 52-158252, the present invention achieves the above-mentioned effects without deteriorating the speed change performance.

Furthermore, since the inward projections 5 form only in a portion of the vertical width of the pin link plate 1, elongation due to the tension constantly applied when the chain is driven can be minimized.

In other words, in the present invention, the inward protrusion 5 is formed protruding only at the approximate center of the pin link plate 1 while leaving the four circumferences of the inward protrusion 5.
Unlike the roller chain of No. 158252, in which the central portion of the pin link plate is bent inward over the entire area between its upper and lower edges 6, 6, undesirable chain elongation can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is a partially cutaway plan view thereof, Fig. 3 is a front view of another embodiment of the invention, and Fig. 4 is a front view of an embodiment of the present invention.
The figure is a partially cutaway plan view, Figures 5 and 6 are schematic plan views showing the operation of the chain of the present invention, Figure 7 is a schematic front view showing the operation of the conventional chain, and Figure 8 is a schematic plan view thereof. Figure 9 is a schematic plan view showing the chain transmission part of a variable speed bicycle.
FIG. 0 is a schematic plan view showing the operation of the conventional example. 1...Pin link plate, 2...Inner surface of pin link plate, 3...Roller link plate, 4...Inner surface of pin link plate Parts sandwiched between the front and rear roller link plates, 5.
·····protrusion.

Claims (1)

[Scope of utility model registration request] At a portion 4 which is approximately the center of the left and right lengths of each pin link plate 1 and also approximately the center of the top and bottom lengths, a part of the outer surface of the pin link plate 1 is pressed, thereby forming an inner surface 2. A bicycle chain characterized in that a hemispherical, truncated conical or truncated pyramid shaped inward protrusion 5 is formed in a part of the chain.