Brakes – Vehicle – Velocipede
Reexamination Certificate
1999-03-10
2001-02-13
Butler, Douglas C. (Department: 3613)
Brakes
Vehicle
Velocipede
C188S00200R, C188S024210, C188S024150
Reexamination Certificate
active
06186282
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a balanced braking system, particularly to a balanced braking system, which applies a braking force uniformly on the front and rear wheels of a bicycle, such that better stability is achieved and skidding is avoided.
2. Description of Related Art
Conventional braking systems for bicycles mostly have two independent brakes for the front and rear wheels, which are driven by two independent cables and operated by a left handle and a right handle on a handlebar. This arrangement enables a user to stop the bicycle. However, during braking the two brakes are not operated at exactly the same time. Furthermore, the tension of the two cables is not equal. Therefore, unequal braking forces are applied at different times on the front and rear wheels. One of the wheels may block, while the other is still rolling. Thus the braking effect is reduced, the bicycle possibly starts to skid or even falls over.
Apart from the problem of unequal forces applied at different times, conventional brakes for bicycles use pairs of right and left pincers, which do not apply equal frictional forces. As shown in
FIG. 11
, a conventional brake
60
for a bicycle wheel with a rim comprises left and right pincers
61
,
62
, pulled towards each other by a pulling cable
63
for applying a braking force on the rim; a connecting cable
64
, operated by a handle; and a hook
65
for connecting the pulling cable
63
and the connecting cable
64
. The hook
65
is a bent metal plate, which guides the pulling cable
63
and takes the pulling cable
63
along, so as to pull the left and right pincers
61
,
62
towards each other.
However, if the bicycle wheel has an uneven rim or a rim with an uneven surface, the bicycle wheel during rotation will not keep uniform distances to the left and right pincers
61
,
62
, and in the moment of braking, the left and right pincers
61
,
62
will touch the rim at different times, and unequal braking forces will be applied.
Therefore, there is a need to adjust the time of contact of the left and right pincers
61
,
62
and the rim automatically to ensure symmetric and even braking and avoiding a reduced braking effect and a risk of skidding.
In conventional bicycle brakes, a large frictional force occurs between the pulling cable
63
and the hook
65
, so an asymmetric braking force of the left and right pincers
61
,
62
on the rim is not easily compensated by gliding of the pulling cable
63
within the hook
65
. Thus an insufficient braking effect and a risk of skidding result.
SUMMARY OF THE INVENTION
It is the main object of the present invention to provide a balanced braking system, which automatically applies a braking force uniformly at the same time on the front and rear wheels of a bicycle.
Another object of the present invention is to provide a balanced braking system, which ensures better stability of forces in the cables during braking.
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Butler Douglas C.
Pro-Techtor Inter-national Services
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