Land vehicles – Wheeled – Occupant propelled type
Patent
1997-12-22
2000-05-09
Schwartz, Christopher P.
Land vehicles
Wheeled
Occupant propelled type
B62K 100
Patent
active
060593059
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention relates to a cycle wheel drive device, particularly for a bicycle, comprising: to form a second sub-assembly supported by a frame mounting bracket, body mounted coaxially with respect to the axis of the hub, and comprising on the peripheral surface a series of cogs cooperating with a transmission chain, the body of the freewheel being mounted on a tubular support sleeve by means of a bearing to form a first sub-assembly secured to the other frame mounting bracket,
On a traditional bicycle, the wheel support hub and the freewheel with cogs are mounted coaxially on a common axis, the ends of which are locked in apertures of the frame mounting brackets by securing nuts, for example butterfly nuts or eccentric nuts. In the event of a puncture, removing the rear wheel requires the nuts to be unscrewed followed by removal of the whole wheel with the freewheel, after the chain has previously been freed and the derailleur slackened. This known assembly of the hub and freewheel on the same axis is not practical in competition for, in the event of a puncture, the cyclist has to have available a spare wheel having a freewheel with the same cogs suited to his morphology and power. Another drawback is the complexity of fitting, as it requires putting the chain and derailleur back into place.
In professional cycling races, each rider chooses his own gearing corresponding to predetermined cogs of the freewheel. When a team leader has to change the rear wheel of his bike, a team member gives him his wheel, but the leader usually has to change this wheel again, because of the gearing which does not suit him.
In the device described in the document FR-A-2,618,101, the transmission between the freewheel and hub is performed by means of a link ratchet designed to be housed in blind holes machined in the flange. To remove the rear wheel, it is indispensable to unlock the ratchet beforehand by means of a tool. Quite apart from the problem of wear of the ratchet, such a device is complicated to achieve.
OBJECT OF THE INVENTION
The object of the invention is to be able to perform removal and replacement of a rear bicycle wheel easily, leaving the drive freewheel and transmission chain in place, and without having to slacken the derailleur.
The drive device according to the invention is characterized in that the body of the freewheel is equipped with a first transmission means cooperating by disengageable insertion with a second transmission means of the hub to couple or uncouple the mechanical link between the freewheel and the hub when the second sub-assembly is respectively fitted or removed.
According to one feature of the invention, the first and second transmission means comprise male and female transmission members of conjugate shapes, the engagement travel taking place perpendicularly to the axis of the wheel and in the direction of the grooves of the fixing brackets. The male and female transmission members are advantageously formed by tenons and slides with dovetailed cross-sections.
Removing the wheel requires prior extraction of the securing spindle following by uncoupling of the mechanical link achieved by a simple withdrawal movement, the travel of which corresponds to the length of the grooves arranged in the frame mounting brackets. The second sub-assembly of the hub is then dissociated from the first sub-assembly of the freewheel which remains in place on the associated mounting bracket.
According to another feature of the invention, the first sub-assembly comprises means for radial and axial positioning of the freewheel, respectively with respect to the support sleeve and to the internal face of the mounting bracket, and a binding nut screwed onto the sleeve against the external face of the mounting bracket.
The positioning means comprise; mounting bracket and the bearing, the bearing against the adjusting nut and axial positioning of the end of the sleeve on the side where the first transmission means is located.
Other advantages and features will become more clearly apparent f
REFERENCES:
patent: 4567978 (1986-02-01), Butz
patent: 5301778 (1994-04-01), Haeussinger
Bartz C. T.
Bollini Jean
Schwartz Christopher P.
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