Daido Kogyo Co., Ltd.

Takuma Ono

Akiyoshi Komeya

Hiromi Ooya

A greasing through hole is perforated through one outer link plate, and greasing device is attached to the through hole. Degreasing through-holes are perforated through an outer link plate or an inner link plate on the side distant from the outer link plate with a bearing section A between the link plates, and degreasing deviceis attached to those through-holes. Lubricant injected from the greasing device is supplied to the bearing section A through a gap c between the sealing device and the outer link plate, and used lubricant within the bearing section A is discharged out of the degreasing device through another gap c.

Seal chain having greaser

A right outer link plate of a bicycle chain, when viewed from the rear and top, has a projection swelling outwardly on a center edge thereof to lead a tooth of a sprocket into an outwardly spread recess formed by the projection. A left outer link plate of the bicycle chain, when viewed from the rear end top, has a flat face outside and an outwardly tapered face along a central inside portion to lead a tooth of the sprocket into a recess formed by the tapered face. In a front multi - stage sprocket, unit the projection of the right outer plate catches onto a tooth of the large sprocket and the tooth slips into the outwardly spread recess formed by the projection, assuring that the chain shifts from the small sprocket to the large sprocket easily. Although the center edge on the right outer link plate swells outwardly, the front multi - stage sprocket unit has a comparatively wide space between sprockets, and the projection does not interfere with the large sprocket and disturb speed changes. On the other hand, in the rear multi - stage sprocket unit, the tapered face catches onto the tooth of the large sprocket and the tooth slips into the recess formed by the tapered face, which enables the chain to shift from the small sprocket to the large sprocket. Despite that the rear multi - stage sprocket unit has a comparatively narrow space between sprockets, the left outer link plate is flat outside, and the outer link plate does not interfere with the large sprocket.

Chain for a bicycle

A chain joint for a power transmission chain comprises a joint pin and a projecting bush having brims swelling outwardly both its ends with at least one a slit extending longitudinally through the bush. The projecting bush is inserted into a pin hole and a bush hole of the chain, and the joint pin is pressed in an inner hole of the projecting bush. Then, the projecting bush is spread outwardly due to the slit and fits in the pin hole perfectly. Furthermore, the brims engage with the outer link plates on their outsides to prevent the projecting bush from coming off.

Growing community of inventors

Kaga, Japan

Takuma Ono