Bicycle rear derailleur shifting controller

Details Bicycle rear derailleur shifting controller Bicycle rear derailleur shifting controller

1999-04-27

2001-07-24

Fenstermacher, David (Department: 3682)

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

Including belt shiftable axially from one to another surface...

C474S127000, C474S128000, C074S489000, C074S502200

Reexamination Certificate

active

06264576

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a bicycle rear derailleur shifting controller, and more particularly to a simple structure of bicycle rear derailleur shifting controller which positively axially moves the derailleur cable to accurately shift the rear derailleur mechanism of the bicycle when rotated.
A regular bicycle rear derailleur shifting controller is generally comprised of a base and a rotary knob. The base comprises a coupling tube coupled to the handlebar of the bicycle. The rotary knob is fastened to an endpiece at one end of the derailleur cable, and rotatably coupled to the coupling tube of the base. Further, an arcuate spring member and a detent section are respectively provided at the base and the rotary knob. The arcuate spring member comprises an indexing projection shifted between notches at the detent section. The derailleur cable is driven to shift the rear derailleur mechanism of the bicycle upon rotary motion of the rotary knob. This structure of bicycle rear derailleur shifting controller is not satisfactory in function. Because the derailleur cable is wound round the coupling tube of the base and turned radially with the rotary knob around the coupling tube, it tends to be hindered by internal structure of the base, causing the rear derailleur mechanism shifting operated unable to be accurately achieved.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a bicycle rear derailleur shifting controller which eliminates the aforesaid problem. According to one aspect of the present invention, the bicycle rear derailleur shifting controller comprises a base with a coupling tube, a rotary knob coupled to the coupling tube of the base, a cover plate fastened to the base to guide rotary motion of the rotary knob, and a derailleur cable driven by the rotary knob to shift the rear derailleur mechanism of the bicycle, wherein the coupling tube has a longitudinal sliding track and a cable hole; the derailleur cable has one end inserted through the cable hole at the coupling tube and terminating in an endpiece, which is moved by the rotary knob along the longitudinal sliding track; the rotary knob comprises a sleeve coupled to the coupling tube of the base, the sleeve defining an axial center hole, which receives the coupling tube, and a stepped guide flange inside the axial center hole, the stepped guide flange having radially extended straight edges and axially extended sloping edges alternatively arranged at one end adjacent to the base and moved with the rotary knob against the endpiece of the derailleur cable to shift the rear derailleur mechanism of the bicycle. According to another aspect of the present invention, the sleeve of the rotary knob comprises an outside annular flange having a plurality of endless grooves arranged in parallel around the periphery, and the cover plate comprises a plurality of projections raised from a smoothly curved side edge thereof and respectively inserted into the endless grooves at the outside annular flange of the rotary knob to guide rotary motion of the rotary knob on the coupling tube of the base.


REFERENCES:
patent: 5618241 (1997-04-01), Ose
patent: 5728018 (1998-03-01), Terada et al.
patent: 5921140 (1999-07-01), Lemmens

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