Patent ID: 9387905
Filing Date: 2016-07-12
CPC Classification: B62M,F16H,Y10T

Claim Text:
1. A sprocket for a bicycle, comprising: a radial bearing acting as a bearing portion; a shaft adapted to be inserted into a right crank and secured therein, the shaft including a threaded portion at one end, and a receiving portion projecting from the threaded portion; a left crank fixedly mounted on the receiving portion of the shaft, and having a side at which mounting and dismounting of the left crank are performed; an adjusting nut disposed on the threaded portion of the shaft for applying an appropriate axial force on the radial bearing, the adjusting nut having a first plurality of serrations at a surface thereof; a lock washer arranged to urge against the adjusting nut, and having a second plurality of serrations at one surface facing the surface of the adjusting nut provided with the first plurality of serrations, the second plurality of serrations of lock washer mesh with the first plurality of serrations of the adjusting nut so as to prevent the adjusting nut from loosening, wherein the lock washer non-rotatably engages with the receiving portion projecting from the threaded portion; and a spring washer arranged to urge against the other surface of the lock washer that is free of the serrations, the spring washer being configured to enhance a locking function of the lock washer, and to prevent an excessive force from being applied on the radial bearing during the mounting of the left crank, which would result in a defective rotation, wherein, when the left crank is secured, the axial load of the bearing is adjustable by turning the adjusting nut, without having to dismount the sprocket after assembly.