Brakes – Vehicle – Velocipede
Patent
1996-01-22
1997-08-12
Oberleitner, Robert J.
Brakes
Vehicle
Velocipede
188 731, B62L 102, F16D 6500
Patent
active
056556292
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a bicycle brake shoe, particularly, an embedded type which is to be attached to a brake arm of a brake device which acts upon a bicycle wheel rim.
BACKGROUND ART
A bicycle capable of running off-road, which is, for example, called a mountain bike or all-terrain bike (ATB), is generally equipped with a cantilever type brake device for obtaining a strong deceleration force. The cantilever type brake device comes into contact with both sides of a bicycle wheel rim and thereby acts upon them, and is equipped with a pair of brake arms and a pair of brake shoes. An end of each brake arm is freely pivotally supported by a front fork or a seat stay, and the other end is hung on a brake wire. In addition, the brake shoes are oppositely placed along both sides of the bicycle wheel rim in the middle of the brake arm. Of the brake shoes, an embedded type has: a fixing pin which can be connected to the brake arm; and a shoe main body which is fixed on the fixing pin. The shoe main body includes a mainly synthetic resin-made friction pad, in which a holder plate that is fixed on a tip of the fixing pin is embedded.
In such a cantilever type bicycle brake device, the brake arms are allowed to pivot in the closing directions by pulling brake wires with a brake lever, so that the brake shoes are brought into contact with the rim to press it, thus achieving deceleration.
In such a bicycle brake device, in the case where the wheel rim gets wet because of running under rainy weather or under wet conditions such as on mud roads, noises may be made when the brake shoes are in contact with the wheel rim to press it during deceleration. The noises can roughly be divided into high sound components having a generally high frequency and low sound components which sound having a generally low frequency, and they all grate upon riders' ears. Accordingly, bicycle brake devices are necessary which suppress noises even if the wheel rim gets wet.
An object of the present invention is to suppress noises during deceleration.
DISCLOSURE OF THE INVENTION
A bicycle brake shoe, according to a first embodiment of the present invention, is an embedded type brake shoe to be attached to a brake arm of a brake device which acts upon a bicycle wheel rim, the bicycle brake shoe including a fixing pin and a Shoe main body wherein the fixing pin is made of aluminum and can be connected to the brake arm, and the shoe main body has: a holder plate fixed on a tip of the fixing pin; an elastomer-made friction pad in which the holder plate is embedded and which comes into contact with the wheel rim and thereby acts upon the wheel rim; and the shoe main body having a mass of 28:0 g or larger.
As to this bicycle brake shoe, when the brake arm pivots, the brake shoe connected to the brake arm comes into contact with the wheel rim to press it, thereby effecting deceleration. On this occasion, in the case where the mass of the shoe main body is less than 28.0 g, the use of the aluminum-made fixing pin is liable to cause loud noises. However, it is difficult for noises to occur in the first embodiment of the present invention, because the mass of the shoe main body is 28.0 g or larger.
A bicycle brake shoe, according to a second embodiment of the present invention, has the same features as the first embodiment, but in the second embodiment the holder plate has a larger mass than the friction pad. Therefore, also in the second embodiment, it is difficult for noises to occur.
A bicycle brake shoe, according to a third embodiment of the present invention, has the same features as the first or second embodiment, but in the third embodiment the mass ratio of the shoe main body to the fixing pin is 10 or larger. Therefore, in the third embodiment, it is difficult for noises to occur.
A bicycle brake shoe, according to a fourth embodiment of the present invention, is an embedded type brake shoe to be attached to a brake arm of a brake device which acts upon a bicycle wheel rim, the bicycle brake shoe including a fix
REFERENCES:
patent: 4444294 (1984-04-01), Yoshigai
patent: 5277277 (1994-01-01), Yoshigai
Ohta Katsuyuki
Takizawa Shin'ichi
Oberleitner Robert J.
Schwartz Chris
Shimano Inc.
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