JPH03125689U

JPH03125689U -

Info

Publication number: JPH03125689U
Application number: JP3568990U
Authority: JP
Priority date: 1990-04-02
Filing date: 1990-04-02
Publication date: 1991-12-18

Description

[Brief explanation of drawings]

第１図は本考案の一実施例の自転車のクランク
装置の平面視の断面図、第２図は同装置の平面図
、第３図は従来のクランク装置の斜視図である。１……クランク軸、２……クランク腕、３……
遊星軸、４……固定スプロケツト、５……回転ス
プロケツト、６……チエーン、７……腕、９……
ペダル、４２……軸受部、４３……スプロケツト
、４５……チエーンカバー、４６……取付座、４
７……蓋板、４８……筒体。 FIG. 1 is a sectional plan view of a bicycle crank device according to an embodiment of the present invention, FIG. 2 is a plan view of the same device, and FIG. 3 is a perspective view of a conventional crank device. 1...Crankshaft, 2...Crank arm, 3...
Planetary shaft, 4... Fixed sprocket, 5... Rotating sprocket, 6... Chain, 7... Arm, 9...
Pedal, 42...Bearing section, 43...Sprocket, 45...Chain cover, 46...Mounting seat, 4
7... Lid plate, 48... Cylindrical body.

Claims

[Claims for Utility Model Registration] 1. A crank arm attached to the crankshaft of a bicycle, a planetary shaft rotatably supported at a right angle to the crank arm at the tip of the crankarm, and a planetary shaft attached to the planetary shaft. an arm fixed at right angles to the planetary shaft; a fixed sprocket arranged coaxially with the crankshaft and fixed to the bicycle body; and a rotating arm fixed to the planetary shaft and configured to have the same shape as the fixed sprocket. In a bicycle crank device having a sprocket and an endless body extending between both sprockets, the fixed sprocket is connected to the bicycle body by an auxiliary member interposed between the fixed sprocket and the bicycle body. A bicycle crank device characterized by being attached. 2. The bicycle crank device according to claim 1, wherein the fixed sprocket is attached to a chain cover that covers a chain for transmitting rotation of the crankshaft to the rear wheel. 3 Attach a sprocket for transmitting the rotation of the crankshaft to the rear wheel through a chain to this clamp shaft, provide a mounting seat for the cover lid that is originally provided in correspondence with this sprocket on the chain cover, and attach the fixed sprocket. 3. The bicycle crank device according to claim 2, wherein the crank device is fixed to a cover plate that can be attached to the mounting seat in place of the front cover lid. 4. The bicycle crank device according to claim 1, wherein the fixed sprocket is attached to a cylindrical body that is externally fitted and fixed to a bearing portion for supporting the crankshaft.