FR2588236A3 - Freewheel device for bicycles or the like - Google Patents

Abstract

Freewheel device for bicycles or the like, characterised in that it comprises an external bush 4 equipped with axial splines 11 for assembling gears 13 for changing speed, and an internal bush 1 comprising a threaded end part 2 which can be mounted on the conventional standardised hub for the threaded assembly of the wheel of the bicycle.

Description

 The present invention relates to a freewheel device for bicycles or the like.

 According to the traditional technique, there is associated, with the freewheel device, a series of pinions of different diameters and intended to cooperate selectively with the transmission chain, actuated by the pedals of the bicycle, according to the transmission ratio chosen by the cyclist.

 Traditionally, these pinions are mounted by threaded coupling on the outer sleeve of the freewheel device, the inner sleeve of which is made integral with the hub of the bicycle by threaded coupling.

 According to another known technique, the outer sleeve is provided, not with a thread for its coupling with the pinions, but with longitudinal grooves; however, still according to this known technique, the inner sleeve is not adaptable to the traditional standardized hub with threaded assembly, but it requires a particular hub, of unusual use.

 The object of the invention is to remedy this drawback.

 To achieve this goal, a freewheel device for bicycles is produced, the main characteristic of which is that it comprises an outer bush provided with axial splines for mounting the gear shift gears, and an inner bush comprising a threaded end part, directly mountable on the traditional standardized hub of the bicycle wheel.

 The invention is described below with reference to the accompanying drawings.

 Fig. I is an axial section view of the device according to the invention.

 The . 2 is an axial section view of a component of the device of FIG. 1.

 Fig. 3 is a front view of the component of FIG. 2.

 In the drawings, the reference number 1 designates the inner metal sleeve of the freewheel device, comprising an end portion with an internal thread 2, for mounting the entire device on the hub of the bicycle wheel.

 The socket 1 is in unidirectional connection with a crown of teeth 3-3a provided inside an external socket 4.

 The reference number 5 designates a spacer ring which is pressed by a collar 6, in turn provided with seats 7, 8 intended to receive operating keys.

 ~ Entrn the two sockets 1, 4 are mounted guide balls and parts support, designated respectively by 9 and 10 and maintained at mutual distance in the axial direction.

The balls 10 roll on a track in an arc of a circle 10a of the collar 6.

 The sleeve 4 has axial external grooves 11, for its coupling with corresponding internal teeth 12 of each pinion 13 of the gear change.

 These pinions are kept at a distance from each other in the axial direction by light alloy rings 14. The pinion of larger diameter 13a abuts against a shoulder 15 forms directly in the outer sleeve, while the smaller pinion 13b is blocked on the socket 4 by means of a threaded assembly 16.

 Thanks to the arrangement described above, the mounting of the pinions 13 is easy and quick and it makes it possible in particular to reverse the mounting position of each pinion to compensate for the wear of the teeth 17.

 The entire pinion carrier group can be quickly mounted on a hub fitted with the traditional thread of standard type.

Claims (1)

 CLAIM  Freewheel device for bicycles or the like, characterized in that it comprises an outer bush (4) provided with axial splines (11) for mounting the pinions <13) of the gear change and an inner bush <1) comprising a threaded end part (2) which can be coupled to the traditional standardized hub with threaded assembly of the bicycle wheel.