JPH01309887A - Brake gear for bicycle - Google Patents

Abstract

PURPOSE:To make brake power enough without interfering with other component parts, by reducing a working radius from the pivoted point of a brake body to controlling force working point, and also conveying controlling force of a control wire to the brake body through a power-magnifying mechanism. CONSTITUTION:A working radius from the pivoted point A of a brake body 29 for holding brake shoe 18 to controlling force working point B is reduced without interference with component members, and set to a chain stay 6. A control wire 14b which is connected to a brake lever is hung around the pulley 36 of a power-magnifying mechanism which consists of the pulley 36 and a ring plate 34 and controlling force is multiplied and multiplied controlling force is conveyed to the brake body 29. Thus, even if the working radius from the pivoted point A to the working point B is reduced, controlling force is kept and brake force can be made enough.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a bicycle caliper that brakes by pressing brake shoes on both sides of the rim of a bicycle wheel.
This relates to type brake equipment.

(Prior art) In the figure, 1 (see Fig. 5) is a bicycle head pipe, 2 is a front fork, 3 (see Fig. 5 (a)) is an upper pipe,
4 is the lower pipe, 5 is the vertical pipe, 6 is the chain stay, 7 is the back hawk, 8 (see Figure 5 (b)) is the main frame, 9 is the band brake, 10 (see Figures 1 to 4) is the rear wheel. , 10a is the tire, 10b is the rim, 11 is the hanger lug, 12 is the gear crank, and 13 is the gear plate.

Figure 5(a) shows the diamond-shaped frame of the bicycle, (
b) is a U-shaped frame, (C) and (d) are stand guard type frames, and (e) and (f) are loop-shaped frames.

(Problem to be Solved by the Invention) In the case of a diamond-shaped frame as shown in FIG. 5(a), the brake lever (
(not shown) can be guided rearward along the lower pipe 4 as shown by the solid line, or can be guided rearward along the upper pipe 3 as shown by the two-dot chain line. It's natural and easy.

However, in bicycles other than the diamond-shaped frame shown in FIGS. 5(b) to 5(f), the brake wire consisting of an outer wire and an inner wire has to be bent a lot in order to guide the operating wire 14 to the back hawk 7. This is not preferable because it increases frictional resistance.

For this reason, in the bicycles shown in FIGS. 5(b) to 5(f), it is desirable that the brake device can be accessed from the chain stay 6.

FIG. 4 shows a state in which a conventional center-pull type caliper brake device is attached to the chain stay 6.

In the figure, 15 is a pedestal fixed to the chainstay 6, and 16 is a brake body of a center-pull caliper brake that is pivotally supported at both ends of the pedestal 15 by bolts 17.
This brake body 16 is composed of left and right curved arms, and a brake shoe 18 facing the rim 10b is fixed to the rear end 16a of each arm with a bolt 19, and the front part of each arm is fixed to the left and right, respectively. A connecting cable 20 that intersects and connects the front part 16b of each arm is connected to the brake operating wire 1 via a connector 21.
It is connected to 4.

However, in this case, the front end 16b of the caliper-brake arm of the brake body 16 is connected to the gear plate 13.
In practice, installation is impossible because it interferes with the

As shown in Fig. 4, when the end portions 16b of the arms interfere with other components of the bicycle, this interference can be avoided by shortening the length of each arm's outward protrusion. However, in order to reduce the radius of rotation of the arm and to maintain the pressure of the brake shoe against the rim at the same level as in the past, the operating force of the operating wire must be increased by the smaller radius of rotation.

However, the operating wires of bicycle brakes are currently used under the above-mentioned conditions, and if a higher tension is applied to the operating wires, it will not only cause excessive elongation but also have negative effects on strength and durability. There is a problem with the number of customers.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, in a caliper type brake for a bicycle, the brake body that holds the brake shoes is a center-pull type caliper arm, and the central pull of the brake body is In addition to reducing the radius of action from the fulcrum to the point of application of the operating force to avoid interference with the bicycle's components, this brake body is attached to the chain stay, and the operating force of the operating wire connected to the brake lever is transferred to the booster mechanism and the A bicycle brake device is constructed in such a way that the brake information is transmitted to the brake body via the connected link plates.

(Function) As described above, in the present invention, in a center-pull caliper type brake for a bicycle, the radius of action from the pivot point of the brake body that holds the brake shoe to the point of application of the operating force is expressed as By making it smaller so that it does not interfere with the brake system, it is now possible to attach this brake device to the chain stay of a bicycle.

Further, in the present invention, the operating force of the operating wire connected to the brake lever is not transmitted directly to the brake body, but is transmitted to the brake body via the booster mechanism and the link plate, so the load borne by the operating wire is The force increased by the booster mechanism can be transmitted to the brake body without increasing the force.

Note that although a force larger than the force acting on the operating wire acts on the link plate, the strength of the link plate is sufficient to withstand the load.

Therefore, according to the present invention, excessive elongation of the brake operation wire is prevented to ensure brake operation, and
It is possible to reliably eliminate the negative effects on the strength and durability of the brake device.

(Example) Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 3.

In this embodiment, a left and right connecting pipe 22 (see Fig. 1) is fixedly provided between the left and right chainstays 6, and an upper washer 23 is placed above the vibe 22, and the upper washer 23 is placed below the pipe 22. The lower pedestal 24 is applied, and the arcuate brake mounting member 25 is further applied to the lower side of the lower pedestal 24, and these brake mounting members 25 and the lower pedestal 24 are attached.
A bolt 26 is passed through the left and right connecting pipe 22 and the upper washer 23 from below, and a nut 28 is screwed onto the upper protrusion of the bolt 26 via a washer 27 and tightened to fix the brake mounting member 25. FIG. 3 shows the brake mounting member 25 fixed to the chainstay 6. Reference numeral 25a denotes a brake body mounting hole provided at both ends of the brake mounting member 25, and a boss portion 25b protruding downward is formed around the mounting hole 25a.

Moreover, the brake body 2 has the brake shoe 18 attached to the elongated hole 29b provided in the rear end portion 29a with a bolt 19.
9 is a center-pull type caliper arm, and the intermediate portion of the brake body 29 is pivotally supported in the mounting hole 25a of the brake mounting member 25 with a bolt 30, and fastened with a nut 31. Note that the reference numeral 32 (see FIG. 1) is a coil spring fitted to the outer periphery of the boss portion 29b, which functions to return the brake body 29.

In addition, the length of the front arm portion 29c of the brake body 29 is made shorter than that of the conventional one shown in FIG. The gear plate 13 is a component of the bicycle.
Make it small so as not to interfere with it.

Further, one end of a link plate 34 is connected to the front end 29d of the left and right brake bodies 29 via a shaft 33, and the other ends of these left and right link plates 34 are overlapped, and a shaft 35 is connected to this overlapping part. The pulley 36 is pivotally supported through the pulley 36.

In addition, a bracket 37 is fixed to the lower surface of the connection part with the hanger lug 11 of the chainstay 6, and the outer wire 14a of the operating wire 14 is connected to a brake lever (not shown).
is connected to the bracket 37 via the adjustment screw 38, the inner wire 14b is wound around the pulley 36, and the cable end is fixed to the stopper piece 39 integrated with the bracket 37 with a screw 40 and a nut 41.

As described above, in the device of the present invention, by making the outward protrusion length of the front arm portion 29c of the brake body 29 smaller than before, even when the brake device is attached to the chain stay 6, the brake device can be attached to the gear crank 12 or the gear. Interference with the plate 13 can be prevented.

Furthermore, even if the same force is applied to the inner wire 14b of the operating wire 14 as in the conventional case, the doubled force is transmitted to the left and right brake bodies 29 via each link plate 34 due to the boosting mechanism by the pulley 36. Even if the length of the front arm portion 29c is reduced to 1/2 of the conventional length, it is possible to transmit the same pressing force to the rim 10b to the brake shoe 18 as in the conventional case.

Front arm portion 29 of brake body 29 in this embodiment
Since the length of c is more than 1/2 that of the conventional one, it is possible to obtain a larger pressing force than that of the conventional one.

Although a larger force acts on the link plate 34 than the force acting on the inner wire 14b, the tensile strength of the link plate 34 is sufficiently large (it can be done), so there is no problem in terms of strength.

(Effects of the Invention) As described above, in the present invention, in a center-pull caliber brake for a bicycle, the radius of action from the pivot point of the brake body 29 that holds the brake shoe to the point of application of the operating force B is determined by Since the brake device is made small so as not to interfere with the gear crank 12, gear plate 13, etc., which are the constituent members of the brake device, it has become possible to attach this brake device to the chain stay 6 of a bicycle.

Further, in the present invention, the operating force of the inner wire 14b of the operating wire 14 connected to the brake lever is not transmitted directly to the brake body 29, but is transmitted to the brake body 29 via the booster mechanism consisting of the pulley 36 and the link plate 34. Therefore, the force increased by the boosting mechanism is transferred to the brake body 29 without increasing the load borne by the inner wire 14b of the operating wire 14.
can be conveyed to.

Although a force larger than the force acting on the inner wire 14b of the operating wire 14 acts on the link plate 34, the strength of the link plate 34 is sufficient to withstand the load. Therefore, according to the present invention, excessive elongation of the inner wire 14b of the brake operation wire 14 is prevented to ensure brake operation, and to reliably eliminate negative effects on the strength and durability of the brake device. This has the effect of being able to.

[Brief explanation of the drawing]

Fig. 1 is a partial side view of a bicycle showing the brake device of the present invention, Fig. 2 is a bottom view thereof, Fig. 3 is a partial bottom view of the bicycle showing a state in which the brake mounting member is attached to the chain stay, and Fig. 4 is a partial bottom view of the bicycle. A partial bottom view of a bicycle showing a state in which a conventional center-pull caliper type brake is attached to a chain stay, and FIGS. 5(a) to 5(f) are schematic diagrams showing various frame shapes of a bicycle.

Claims (1)

[Claims] 1. In a bicycle caliper type brake, the brake body that holds the brake shoes is a center-pull type caliper arm, so that the radius of action from the pivot point of the brake body to the point of application of the operating force does not interfere with the bicycle components. A bicycle characterized in that the brake body is made smaller, and the brake body is attached to a chain stay, and the operating force of an operation wire connected to a brake lever is transmitted to the brake body via a booster mechanism and a link plate connected to the booster mechanism. brake equipment.