JPH0446882A - Brake lever device for bicycle - Google Patents

Abstract

PURPOSE:To facilitate brake operation, permit the safe and sure brake operation and improve durability by pivotally installing a pulley in turnable manner at one edge of an auxiliary lever which is pivotally supported separately from a main brake lever. CONSTITUTION:An auxiliary lever 10 is pivotally supported on a bracket 2 by a shaft 11 which is separately installed from the shaft 5 of a main brake lever 4, and a pulley 12 is installed at the front edge of the auxiliary lever 10 in turnable manner by a shaft 13. When the main brake lever 4 is operated in the direction of arrow C, an inner wire 6 is pulled, and brake operation is carried out. Further, when the auxiliary lever 10 is operated in the direction of arrow D, the inner wire 6 is pulled out by the length in about two times of the shift quantity of the pulley 12, and brake application is carried out. Accordingly, even if one brake system is broken, safety is secured, and sure brake operation is facilitated. Further, also durability is improved, and also the compact and simple outside appearance can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bicycle brake lever device having an auxiliary lever in addition to a main brake lever for a bicycle having a drop handle.

(Prior Art) As a conventional bicycle brake equipped with an auxiliary lever in addition to the main brake lever, for example,
There is one disclosed in Publication No. 5.

(Problem to be Solved by the Invention) However, in the conventional bicycle brake described above, the fulcrum of the main brake lever and the auxiliary lever is the same point, so that the main brake lever and the auxiliary lever are linked when the brake is operated. In this case, it is dangerous because not only does it become difficult to operate the needle, but if the main brake lever stops working due to a failure, the auxiliary lever will also stop working.

Further, as shown in Fig. 5, the brake lever C is pivoted on the bracket b protruding from the drop handle a, and if the pivot point d is moved to the point e on the front of the bracket b, the brake lever C can be moved. Easier to operate.

In other words, the component forces in the perpendicular direction to each line of action, i'l+12, from the fulcrums d and e of the brake lever C to the point of action f are as shown by arrows A and B, and the brake lever C is pressed while gripping the drop handle a. This is because the direction of the operating force for operating is close to arrow B.

For this reason, recently, brake devices with only a main brake lever are trying to position the fulcrum of the brake lever as far forward as possible, but brakes with an auxiliary lever have a limit. The reason for this is that if the fulcrum of the auxiliary lever is also located at the front and close to the fulcrum of the main lever, the stroke of the auxiliary lever will be insufficient during operation due to the leverage ratio, resulting in the so-called "bottoming out". ” phenomenon, and the brakes become ineffective.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a brake lever device with an auxiliary lever for a drop handle, in which a pulley is provided at one end of the auxiliary lever that is pivoted separately from the main brake lever. A bicycle brake lever device is constructed by rotatably supporting the brake operating wire and connecting the cable end of the brake operating wire to the operating point of the main brake lever via the pulley.

(Function) As described above, in the present invention, since the main brake lever and the auxiliary lever are each pivoted separately, the main brake lever and the auxiliary lever can perform independent braking, so that the braking of the other lever is It is safe even if the system fails.

Furthermore, according to the present invention, the shaft of the main brake lever, which has sufficient leverage, can be located at the front of the bracket, allowing ideal hand and finger movement when operating the main brake lever while gripping the drop handle. This makes it easier to apply force to your fingertips. Therefore, brake operation becomes easier.

In addition, in the present invention, a pulley is provided at the tip of the auxiliary lever,
Since the brake operation wire is amplified and operated using this pulley, the fulcrum of the auxiliary lever can be set to obtain sufficient leverage, so the brake operation can be performed reliably without causing insufficient stroke of the auxiliary lever. can.

Furthermore, since the bent portion of the brake operating wire is received by the pulley groove, there is no risk of damaging the wire, and durability is improved.

As described above, according to the present invention, the lever ratios of both the main brake lever and the auxiliary lever can be optimized, and the lever operation can be made light and easy to perform, and can be done reliably. Moreover, the appearance can be made compact and simple.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 4. In the figure, 1 is a drop handlebar of a bicycle, 2 is a bracket attached to the drop handlebar 1 and fastened with a band 3, 4 is a main brake lever pivoted to the front part of the bracket 2 by a shaft 5, and 6 is a brake operation wire ( (inner wire), and 7 is its outer wire. The cable end of the inner wire 6 is connected to a wire terminal 8 (second.
4) and the upper end of the main brake lever 4 via a wire fixture 9, and the outer wire 7 has its end fixed to the bracket 2.

In this embodiment, the auxiliary lever IO is provided so as to be pivotally supported on the bracket 2 by a shaft 11 different from the shaft 5 of the main brake lever 4, and a pulley 12 is provided at the front end of the auxiliary lever 10 so as to be rotatable by a shaft 13. , the brake operation wire (inner wire) 6 is engaged with the groove of the pulley 12.

The pulley 12 may be provided inside the bracket 2, and the left and right auxiliary levers 10 may be provided inside the bracket 2, respectively. 14 shown in FIGS. 1 and 4 is a long hole provided inside the bracket 2, and 10a (see FIG. 4) is a boss portion of the shaft 13 that projects from the auxiliary lever 10.

Next, the operation of the apparatus of the present invention constructed as described above will be explained.

When the main brake lever 4 is operated in the direction of arrow C from the state shown in FIG. 1, the inner wire 6 is pulled through the wire fixture 9 and the pulley 12, thereby performing braking.

Furthermore, when the auxiliary lever 10 is operated in the direction of the arrow from the state shown in FIG. It is pulled out by the length of .

That is, braking is performed by the action of this inner wire 6.

(Effects of the Invention) As described above, in the present invention, the main brake lever 4 and the auxiliary lever 10 are each pivoted separately, so the main brake lever 4 and the auxiliary lever 10 can each perform independent braking. , it is safe even if one of the braking systems fails.

Furthermore, according to the present invention, the shaft 5 of the main brake lever 4, which has sufficient leverage, can be located at the front of the bracket 2, making it ideal for operating the main brake lever 4 while gripping the drop handle. You will be able to move your fingers more easily, and it will be easier to put pressure on your fingertips. Therefore, brake operation becomes easier.

In addition, in the present invention, a pulley 12 is provided at the tip of the auxiliary lever lO.
Since the brake operation wire 6 can be amplified and operated by the pulley 12, the fulcrum of the auxiliary lever 10 can be set so as to obtain sufficient leverage, so that the auxiliary lever 10 does not have insufficient stroke. , enabling reliable braking operation.

Further, since the bent portion of the brake operation wire 6 is received by the groove of the pulley 12, there is no risk of damaging the wire 6, and durability is improved.

As described above, according to the present invention, the main brake lever 4
By optimizing the lever ratios of both the lever and the auxiliary lever 10, lever operation can be made light and easy, and can be done reliably. In addition, the present invention provides many excellent effects such as being compact and simple in appearance.

[Brief explanation of drawings]

Fig. 1 is a side view showing the device of the present invention attached to the drop handlebar of a bicycle, Fig. 2 is a side view showing a part of Fig. 1 in section, Fig. 3 is a front view thereof, and Fig. 4 is FIG. 3 is a partially cross-sectional front view, and FIG. 5 is an explanatory side view of a brake lever device including only a main brake lever. l... Drop handlebar 2... Bracket 3... Mounting band 4
... Main brake lever 5 ... Shaft 6 ... Brake operation wire (inner wire) 7 ...
・Outer wire 8... Wire terminal 9... Wire fixture lO... Auxiliary lever 11... Shaft 13... Shaft 12... Pulley 14... Long hole

Claims (1)

[Claims] 1. In a brake lever device with an auxiliary lever for a drop handle, a pulley is rotatably supported at one end of the auxiliary lever which is supported separately from the main brake lever,
A bicycle brake lever device, characterized in that a cable end of a brake operating wire is connected to an operating point of a main brake lever via the pulley.