Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1994-08-05
1996-01-09
Bonck, Rodney H.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
74142, 74489, 745022, 74506, 474 79, B62M 2504
Patent
active
054819342
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a bicycle speed change operation assembly. More specifically the present invention relates to a bicycle speed change operation assembly wherein a speed change operation can be performed during a braking operation.
BACKGROUND ART
A bicycle speed change assembly for sports type bicycles is commonly mounted on a bicycle frame member such as the down tube or the top tube. Therefore, the rider must unhand the handlebar to perform a speed change operation.
As a result, it is impossible to immediately perform a braking operation during the speed change operation. In addition, the rider has to assume a single hand steering, which leads to unstable handlebar operation and poor safety.
On the other hand the speed change operation is required, in general, when road conditions change, for example, from a flat road to a slope, or vice versa. In such occasions the bicycle becomes unstable and the brake operation is often needed.
In an attempt to solve this problem the Japanese Utility Model Laid-open 58-46693 discloses a grip rotating type speed change operation assembly, wherein a cylindrical operation member is fitted around each of the left and right grip portion of the handlebar, and these cylindrical operation members are rotated to pull or pay out the speed control cable.
In this grip rotating type speed change operation assembly, it becomes possible to perform a speed change operation without unhanding the handlebar grip portion, resulting in remarkable improvement in riding safety during speed change operation.
In off-road riding on a mountain bike for example, it is sometimes necessary to perform a speed change operation during a braking operation.
In such a case, with the conventional grip rotating type speed change operation assembly, the brake must be operated while the cylindrical operation member gripped by the hand and fingers must be rotated at the same time. However, when the speed change operation is required through a plurality of speed steps, the amount of rotation required for the speed change operation member becomes large, and therefore, the hand and finger must be repositioned. Thus, it is very difficult to perform a speed change operation in optimum response to different riding situations while keeping the fingers engaged with the brake lever.
In addition the speed change operation is performed in various ways in response to the changing running situation; sometimes the speed change operation is made in a stepped manner, or some other times the speed change operation is made all the way through several speed steps as mentioned earlier. It is too demanding to perform the speed change operation in many different ways using only one operation member.
DISCLOSURE OF THE INVENTION
It is therefore an object of the present invention to provide a bicycle speed change operation assembly wherein the speed change operation can be performed during the braking operation, and the speed change can be made in an optimum way in relation to various running situations.
The present invention provides a bicycle speed change operation assembly comprising a first speed change operation member and a second speed change operation member each supported around a grip end portion of the handlebar about an axis of a handlebar for rotation, a cable winding member rotated in response to a rotating operation of the speed change operation members for winding or paying out a speed control cable, and a retaining mechanism for holding the cable winding member at a predetermined rotational position; wherein the first speed change operation member is connected to the cable winding member for integral rotation therewith in a cable pulling direction and a cable paying out direction; whereas the second speed change operation member is connected to the cable winding member by a transmission mechanism for rotating the cable winding member in the cable pulling direction or the cable paying out direction in response to rotational reciprocation of the second speed change operatio
REFERENCES:
patent: 3218879 (1965-11-01), Reed
patent: 4191065 (1980-03-01), Golobay et al.
patent: 4461189 (1984-07-01), Rottenkolber et al.
patent: 4938733 (1990-07-01), Patterson
patent: 5134897 (1992-08-01), Romano
patent: 5203213 (1993-04-01), Nagano
patent: 5390565 (1995-02-01), Togawa et al.
patent: 5421219 (1995-06-01), Tagawa et al.
Bednarek Michael D.
Bonck Rodney H.
Grabow Troy
Mory Suntour Inc.
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