Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive
Patent
1998-08-21
2000-09-26
Estremsky, Sherry L.
Planetary gear transmission systems or components
With means to vary drive ratio or disconnect drive
192 352, F16H 6330
Patent
active
06123639&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for actuating a switch shaft which is operatively connected with a switchable bottom bracket bearing gear for a bicycle or the like and is held in a hollow-cylindrical drive shaft, which switch shaft is jointly displaceable relative to the drive shaft in the axial direction with the first coupling member which is arranged at the one end of the drive shaft rotatable about its longitudinal axis and is to be connected in a form-locked manner with the power-transmitting functional elements of the bottom bracket bearing gear.
Switchable bottom bracket bearing gears for a bicycle or the like are known from specifications (EP-A 0 562 470 and EP-A 0 666 212) in which a coupling member operatively connected with a switch shaft as well as a drive shaft can be brought into engagement with a chain wheel or with a sun wheel arranged at a distance therefrom or vice-versa for the purpose of achieving a change in the rotational speed, with the movement of the switch shaft oriented in the axial direction for the switching operation being effected by means of a switching member which is arranged on the outside of the crank and can be actuated with the foot. The individual switching member can be arranged either in the form of a thrust member arranged in a recess of the crank and in the shape of a button, or in the form of a longitudinal thrust member which is held on the outer side of the crank and is deflectable relative thereto.
SUMMARY OF THE INVENTION
The invention is based on the object of providing an apparatus by means of which the axial displacement of the individual functional elements which is required for the change in speed is facilitated substantially whilst retaining a precise switching operation and secure handling.
This object is achieved pursuant to the invention in such a way that a second coupling member is arranged on the other end of the switch shaft and is operatively connected with a control body held on the drive shaft in such a way that in the case of swivelling movement of the control body which is oriented about the longitudinal axis, which body is connected with at least one actuating member, the said control body is moved in the axial direction together with the switch shaft and in this process the first coupling member, which is arranged on the drive shaft and is displaceable in the axial direction relatively thereto, can be brought into engagement, depending on the swivelling direction, for the form-locked and non-positive operative connection of the functional elements.
BRIEF DESCRIPTION OF THE DRAWING
Further features and embodiments of the invention arise from the description below in conjunction with the patent claims and the drawing. The invention is explained below by reference to the enclosed drawing, wherein:
FIG. 1 shows a bottom bracket bearing for a bicycle or the like in a projection and partly a sectional view with associated switchable bottom bracket bearing gear as well as a first embodiment of an apparatus for actuating the bottom bracket bearing gear;
FIG. 2 shows in a projection a section of the bottom bracket bearing pursuant to FIG. 1 with a second embodiment of the apparatus for actuating the bottom bracket bearing gear;
FIG. 3 shows in a projection a section of the bottom bracket bearing pursuant to FIG. 1 with a third embodiment of the apparatus for actuating the bottom bracket bearing gear;
FIG. 4 shows the first embodiment of the apparatus for actuating the bottom bracket bearing gear in a sectional view pursuant to the line IV--IV in FIG. 1 as well as on an enlarged scale;
FIG. 5 shows the first embodiment of the apparatus for actuating the bottom bracket bearing gear in a sectional view pursuant to the line V--V in FIG. 1 as well as on an enlarged scale;
FIG. 6 shows the first embodiment of the apparatus for actuating the bottom bracket bearing gear in a longitudinal section pursuant to the line VI--VI in FIG. 4;
FIG. 7 shows the first embodiment of the apparatus for actuating the bottom bracket
REFERENCES:
patent: 678486 (1901-07-01), Head
patent: 4936597 (1990-06-01), Hartmann
Estremsky Sherry L.
Feiereisen Henry M.
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