Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Reexamination Certificate
1999-08-10
2001-04-24
Herrmann, Allan D. (Department: 3682)
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
C074S473280, C074S489000, C074S502200
Reexamination Certificate
active
06220111
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a bicycle speed changing device, and more particularly to a bicycle speed changing device which is operated by two levers capable of returning automatically to an original position thereof after being released.
BACKGROUND OF THE INVENTION
The conventional bicycle speed changing device is operated by the swivelling lever such that the guide wire is actuated so as to attain the speed-changing action. This type of the bicycle speed changing device is rather inefficient at best in view of the fact that the device is often difficult for a bicyclist to maneuver after the device is located at a certain operating position or angle.
There is another conventional type of the bicycle speed changing device which is operated by two rods and is relatively complicated in construction, thereby resulting in a unreliable operation as well as a substantial increase in the production cost.
SUMMARY OF THE INVENTION
It is therefore the primary objective of the present invention to provide a bicycle speed changing device which can be operated with ease.
It is another objective of the present invention to provide a bicycle speed changing device which can be operated with precision.
In keeping with the principle of the present invention, the foregoing objectives of the present invention are attained by a bicycle speed changing device comprising a base, and a pivotal column over which a wire wheel, a ratchet gear, a check plate, a rotary plate, a reverse lever, a forward lever, and a fastening piece are sequentially fitted. The base is provided in the inner peripheral edge thereof with a position-confining portion for retaining a locating member of the wire wheel. The ratchet gear is provided with forward teeth and reverse teeth. The check plate is fastened with the base and provided with a first retaining portion and a second retaining portion. The rotary plate is provided with a stop portion, a reverse pawl for catching a reverse tooth of the ratchet gear, and an elastic member for providing an elastic force enabling the rotary wheel to turn such that the rotary plate presses against the second retaining portion of the check plate. The reverse lever has a rotation stopping portion capable of holding the stop portion of the rotary plate, and a push portion capable of pushing the reverse pawl. The forward lever has a forward pawl for catching the forward tooth of the ratchet gear, and an elastic member capable of actuating the forward lever to turn such that the forward lever urges the first retaining portion of the check plate.
In a forward operation, the forward lever is actuated to turn aside such that the forward pawl turns the ratchet gear, and that the wire wheel is actuated to pull the speed changing guide wire. In a reverse operation, the reverse lever is actuated such that the reverse lever urges the reverse pawl to catch the reverse teeth of the ratchet gear, thereby causing the ratchet gear to turn so as to actuate the wire wheel to pull the speed changing guide wire.
REFERENCES:
patent: 5673594 (1997-10-01), Huang et al.
patent: 5791195 (1998-08-01), Campagnolo
patent: 5957002 (1999-09-01), Ueng
Browdy and Neimark
Herrmann Allan D.
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