JPH01275294A - Bicycle brake - Google Patents

Abstract

PURPOSE:To provide possibility of mounting a brake device on a chain stay and transmitting an increased force, by lessening the radius of action of a maneuvering force from the pivoting fulcrum for a brake body, and transmitting the maneuvering force of a maneuvering wire through a force doubling mechanism using pulleys. CONSTITUTION:The radius of action till the point of action of the maneuvering force from the pivoting point O1 of a brake body retaining a brake shoe 20 is made small so as not to interfere with a gear crank 12, and the maneuvering force of a maneuvering wire 19 coupled with a brake lever is transmitted to the brake body via a force doubling mechanism using pulleys 26. This allows mounting of brake device on a chain stay 6, and the force increased by this doubling mechanism can be transmitted to the brake body without enlarging the load which the maneuvering wire 19 sustain. Thus the wire 19 is prevented from excessive elongation to ensure the braking motions.

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. 2) is a bicycle head pipe, 2 is a front fork, 3 is an upper pipe, 4 (see Figs. 1 to 3) is a lower pipe, 5 is a vertical pipe, and 6 is a bicycle head pipe. Chentessu, 7
is a punk hawk, 8 (see Figure 2 (b)) is a main frame, 9 is a band brake, 10 (see Figures 1 and 3)
is a rear wheel, 10a is its tire, 10b is a rim, 11 is a hanger lug, 12 is a gear crank, and 13 is a gear plate.

Also, in Figure 2, (a) shows a bicycle tire send type frame, (b) shows a U-shaped frame, (C) (, ()) shows a squat guard type frame, and (e) and (f) show a loop type frame. It is.

(Problem to be Solved by the Invention) In the case of a diamond-shaped frame as shown in Fig. 2(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 easy and reasonable.

However, in bicycles other than the diamond-shaped frame shown in FIGS. 2(b) to 2(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. 2(b) to 2(f), it is desirable to attach a brake device to the chain stay 6 as shown in FIG. 3.

Figure 3 shows the conventional Zydopull type caliper arm 15A,
15B is attached to the chain stay 6. In this case, each free end 15A of the caliper arms 15A, 15B
There is a problem in that it is impossible to implement this method because the gears a and 15Ba interfere with the gear crank 12, respectively.

In the figure, reference numeral 16 indicates a connecting plate fixed to the lower surface of the left and right chainstays 6, 17 indicates a bolt that rotatably supports the left and right caliper arms 158 and 15B with respect to the connecting plate 16, and 18 indicates The outer wire of the brake wire has an adjusting screw portion 18a at its end that connects to the caliper arm 15.
The cable end 19a of the operating wire 19, which is the inner wire, is fixed to the free end 158a of the caliper arm 15A. Also 2
0 is the rim 10b of each caliper arm 15A, 15B
This is a brake shoe fixedly provided with a bolt 21 at the end opposite to the brake shoe.

As in the device shown in FIG. 3, a caliper arm 158,
If the free ends 15Aa and 1.5Ba of 15B interfere with other components of the bicycle, this interference can be avoided by shortening the outward protrusion length of each arm. In order to make the rotation radius of the brake shoe 20 smaller and to make the pressing force of the brake shoe 20 against the rim 10b comparable to that of the conventional one, the operation wire 1 must be adjusted by the smaller rotation radius.
The operating force of 9 must be increased.

However, the operating wire 19 of the bicycle brake is suitable for its strength under the conditions under which it is currently used, and if a higher tension is applied to the operating wire 19, it will not only elongate excessively, but also have lower strength and durability. There is a problem in that it causes negative effects.

(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 left and right brake bodies that hold the brake shoes are pivoted to the chain stay as Zyd pull type caliper arms. , the radius of action from the pivot point of the brake body to the point of application of the operating force is made small so as not to interfere with the components of the bicycle, and the end of the outer wire of the operating wire connected to the brake lever is connected to the -
At the same time, a pulley is pivotally supported on the free end of the other brake body, the operating wire is wound around the pulley, and the cable end is attached to the one brake body. They are connected to form a bicycle brake device.

(Function) As described above, in the present invention, in a caliper type brake for a bicycle, the radius of action from the pivot point of the brake body that holds the brake shoes 5 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.

Furthermore, in the present invention, the operating force of the operating wire connected to the brake lever is not directly transmitted to the brake body, but is transmitted to the brake body via a booster mechanism using a pulley, so that the load borne by the operating wire is reduced. The force increased by the booster mechanism can be transmitted to the brake body without increasing the force.

Therefore, according to the present invention, excessive elongation of the brake operation wire is prevented to ensure brake operation, and
Negative effects on the strength and durability of the brake device can be reliably eliminated.

(Example) An example of the present invention will be described below with reference to FIG. In the figure, the same reference numerals as those mentioned above indicate equivalent parts.

61 In this embodiment, a pedestal 22 is provided protruding from the lower side of the connecting plate 16 fixed to the lower surface of the left and right Centes-6, and the left and right brake bodies that hold the brake shoes 20 of a bicycle caliper type brake are mounted. Side pull type caliper arm 2
3A and 23B are rotatably supported by bolts 24 to the pedestal 22 and the connecting plate 16, respectively, and pivot points 0.3A and 23B of each of these caliper arms 23A and 23B. (See Figure 1 (B)), each arm 23A
, free end 238a of 23B, center point 02 of 23Ba
, 03 to 03 are made small so as not to interfere with the gear crank 12, which is a component of the bicycle.

The outer wire 18 of the operating wire 19 is connected to a brake lever (not shown) provided on the handlebar of the bicycle.
The adjusting screw portion 18a provided at the end of the free end portion 23Ba
and the other free end 23Aa.
A pulley 26 is rotatably supported by a bolt 27, and the operating wire 19 is wound around the pulley 26, and its cable end 19a is fixed to the free end 23Ba.

Next, the operation of the apparatus of the present invention constructed as described above will be explained. When you operate a flake lever (not shown) attached to the handle of the bicycle and pull the operating wire 19 forward in the direction of arrow A (see Figure 1), the pulley 26
The left and right caliper arms 23A, 23B rotate around the bolt 24 as shown by arrow B in FIG. brake.

In this case, due to the action of the boosting mechanism by the pulley 26, each of the free ends 23Aa of each of the 4-Year IJ and 7-Years 23A and 23B.

The force acting on 23Ba is twice the force acting on the operating wire 19, and its stroke becomes 1/2.

Therefore, there are 23 caliper arms, from the pivot point 0 of 23B (see FIG. 1 (tl)) to each free end 238a,
Radius of action R,,R to points of action 02, 03 of 23Ba
Even if 2 is reduced to 1/2 of that of the conventional brake shoe 20, the brake shoe 20 can exhibit the same braking action as that of the conventional brake shoe.

That is, according to the present invention, each caliper arm 23A,
To prevent the brake device from interfering with the gear guar rank 12 or the gear plate 13 even when the brake device is attached to the chain stay 6 by making the outward protrusion length of the free end side of 23B smaller than before. I can do it.

In addition, since it is sufficient to apply the same force to the operating wire 19 as in the conventional case, the operating wire 19 may not stretch too much.
There is no fear that durability will deteriorate.

(Effects of the Invention) As described above, in the present invention, in a caliper type brake for a bicycle, the radius of action from the pivot point of the brake body that holds the brake shoes to the point of application of the operating force interferes with the component parts of the bicycle. I made it small so that it wouldn't
It is now possible to attach this brake device to a bicycle chain.

Furthermore, in the present invention, the operating force of the operating wire connected to the brake lever is not directly transmitted to the brake body, but is transmitted to the brake body via a booster mechanism using a pulley, so that the load borne by the operating wire is reduced. The force increased by the booster mechanism can be transmitted to the brake body without increasing the force.

19= Therefore, according to the present invention, excessive elongation of the brake operation wire is prevented to ensure brake operation, and
According to the present invention, many effects can be obtained, such as being able to reliably eliminate adverse effects on the strength and durability of the brake device.

[Brief explanation of the drawing]

FIG. 1(a) is a partial side view of a bicycle showing an embodiment of the present invention, FIG. 1(b) is a bottom view thereof, and FIGS. 2(a) to (f) are schematic diagrams showing various frame shapes of the bicycle. , FIG. 3 is a partial bottom view of a bicycle showing a state in which a conventional brake device is attached to a chain stay. ■...Head pipe 2...Front fork 3...Upper pipe 4...Lower pipe 5 Vertical pipe 6-...Chain stay 7/Hasoku Hawk 8 -Main frame 10...Rear wheel
10a... Tire 10b... Rim
11. Hanger lug 12. Gear crank
13...Gear plate 18...Outer wire 19.
...Operation wire 20...Brake shoe 238, 23B...Caliper arm (brake body) 23Aa, 23Ba...Free end portion 26...
・Pulley patent applicant Brideston Cycle Co., Ltd. Representative Patent Attorney Akatsuki Sugimura Representative Patent Attorney Oki Sugimura Figure 2 <a) (C) (e) (Mu (b) (d) (f) No ゝζsuesa

Claims (1)

[Claims] 1. In a bicycle caliper-type brake, the left and right brake bodies that hold the brake shoes are pivoted to the chain stay as side-pull caliper arms, and the radius of action from the pivot point of the brake body to the point of application of the operating force is determined by The outer wire end of the operating wire connected to the brake lever is fixed to the free end of the one brake body, and a pulley is attached to the free end of the other brake body. A bicycle brake device, characterized in that the operating wire is pivotably supported, the operating wire is wound around the pulley, and the cable end is connected to the one brake body.