Brakes – Operators – Fluid pressure
Reexamination Certificate
2000-04-27
2001-02-27
Schwartz, Chris (Department: 3613)
Brakes
Operators
Fluid pressure
C188S349000
Reexamination Certificate
active
06193030
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a hydraulic brake system for a bicycle wherein the rear brake means and the front brake means can be actuated separately or simultaneously.
BACKGROUND OF THE INVENTION
A conventional bicycle brake system generally includes a front brake means for stopping the front wheel, and a rear brake means for stopping the rear wheel of a bicycle. Each brake means includes two calipers located on two sides of a rim and each caliper has a brake pad so that when the brake pads are pushed to contact the rim, the wheel is stopped. The rear brake means and the front brake means are controlled by brake levers on two ends of the handlebar. Two respective brake cables are connected between the brake lever and the brake means. In other words, the front brake means and the rear brake means are operated in separate by pulling the brake levers. Generally, the brake for the rear wheel is to reduce the speed of the bicycle and then the brake for the front wheel is to completely stop the bicycle. However, when in emergency, the rider will pull the two brake levers simultaneously to stop the bicycle in a short time. But when the hands of the rider pull the brake levers, the handlebar tends to loose its control. Furthermore, it is impossible to let the two brake means be actuated simultaneously. If the front brake means is first actuated by a large force, the bicycle could jump and fall.
The present invention intends to provide a brake system wherein the front brake means and the rear brake means can be actuated simultaneously by pulling either of the two brake levers.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a hydraulic brake system for a bicycle and comprises a body having two inlets respectively connected to two brake levers, a first outlet and a second outlet. The first outlet is connected to a front brake assembly and the second outlet is connected to a rear brake assembly. A common groove is defined in the body and located between the two inlets and the first outlet and the second outlet. The two inlets communicate with the common groove by two first passages. The first outlet communicates with the common groove by a second passage, and the second outlet communicates with the common groove by a third passage. By the common groove, either brake lever is actuated, the front brake assembly and the rear brake assembly are actuated simultaneously.
The object of the present invention is to provide a hydraulic brake system that actuates the front brake assembly and the rear brake assembly simultaneously by pulling either one of the two brake levers.
Another object of the present invention is to provide a hydraulic brake system that actuates the rear brake assembly with a brake force less than the brake force actuating to the front brake assembly.
These and further objects, features and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, several embodiments in accordance with the present invention.
REFERENCES:
patent: 3554334 (1971-01-01), Shimano
patent: 3993174 (1976-11-01), Williams et al.
patent: 4494800 (1985-01-01), Hayashi
patent: 5443134 (1995-08-01), Gajek et al.
patent: 5544946 (1996-08-01), Toyoda et al.
patent: 5620237 (1997-04-01), Iwashita et al.
Bacon & Thomas PLLC
Schwartz Chris
LandOfFree
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