Patent ID: 7225910
Filing Date: 2007-06-05
Classification: A61G,F16D

Abstract:
1. A freewheel hub device, comprising a mounting part ( 1 ); a first locking ring means ( 10 ), which is supported by and non-turnably connected to the mounting part and has a centre bore and axial inner grooves ( 13 ) , whose one side wall forms a first wedge surface ( 13 a ) which has a distance, decreasing in one circumferential direction (A) of the first locking ring means, to the axis of the centre bore ; a lock body holder ( 14 ), which is mounted, in a limited turnable manner, in the centre bore of the first locking ring means ( 10 ) and supports at least two lock bodies ( 15 ) which project radially a distance from the lock body holder and each extend in a separate groove ( 13 ) of the first locking ring means ( 10 ) and which are movable radially inwards against spring action directed essentially radially outwards; and a hub ( 45 ), which is rotationally mounted in the lock body holder ( 14 ) coaxially therewith and has a circular-cylindrical circumferential surface ( 47 ) for cooperation with the lock bodies ( 15 ), each lock body ( 15 ), after turning of the lock body holder ( 14 ) in said one direction (A) to a first turning position, abutting against the associated first wedge surface ( 13 a ), which against said spring action forces the lock body radially inwards in the lock body holder into engagement with the circumferential surface ( 47 ) of the hub ( 45 ), whereby the hub is prevented from rotating in said one direction (A), characterised in that the other side wall of the axial grooves ( 13 ) formed in the first locking ring means ( 10 ) forms a second wedge surface ( 13 b ), which has a distance, decreasing in the other circumferential direction (B) of the first locking ring means, to the axis of the centre bore, each lock body ( 15 ), after turning of the lock body holder ( 14 ) in said other direction (B) to a second turning position, abutting against the associated second wedge surface ( 13 b ), which against said spring action forces the lock body radially inwards in the lock body holder into engagement with the circumferential surface ( 47 ) of the hub ( 45 ), whereby the hub is prevented from rotating in said other direction (B), while each lock body ( 15 ), when the lock body holder ( 14 ) is in an intermediate turning position between the first and the second turning position, is held, by said spring action, disengaged from the circumferential surface ( 47 ) of the hub ( 45 ), so that the hub is rotatable in both directions (A and B), that the device further comprises a second locking ring means ( 28 ) which is concentric with the first locking ring means ( 10 ) and has a centre bore and axial inner grooves ( 29 ), whose one side wall forms a third wedge surface ( 29 a ) which has a distance to said axis, which decreases in said one direction (A), the lock body holder ( 14 ) being mounted in a limited turnable manner in the centre bore of the second locking ring means ( 28 ) in such a manner that said lock bodies ( 15 ) each extend into a separate groove ( 29 ) of the second locking ring means, each lock body ( 15 ), when the lock body holder ( 14 ) and the second locking ring means ( 28 ) are in a first mutual turning position after turning of the second locking ring means in said other direction (B) relative to the lock body holder, abutting against the associated third wedge surface ( 29 a ), which against said spring action forces the lock body radially inwards in the lock body holder into engagement with the circumferential surface ( 47 ) of the hub ( 45 ), whereby the hub is prevented from rotating in said one direction (A).