JPH02129987U

JPH02129987U -

Info

Publication number: JPH02129987U
Application number: JP3892989U
Authority: JP
Priority date: 1989-03-31
Filing date: 1989-03-31
Publication date: 1990-10-26

Description

[Brief explanation of drawings]

第１図は第５図のＩ−Ｉ線断面に相当する図、
第２図は第１図の矢視方向図、第３図は実施例
に係るチエン受け具の側面図、第４図は第３図の
−線断面図、第５図は実施例に係るギヤクラ
ンクの外側面図、第６図は従来例を示した図であ
る。５…クランクアーム、５ｂ…スプロケツト支持
部（スプロケツト支持アーム部）、６，７…大径
スプロケツト、８…インナスプロケツト（最小径
スプロケツト）、１１…（インナスプロケツトの
）固定ボルト、１１ａ…ピン挿着孔、１２…チエ
ン受け具、１２ｂ…ピン。 FIG. 1 is a diagram corresponding to the I-I line cross section in FIG. 5,
FIG. 2 is a view in the direction of the arrow in FIG. 1, FIG. 3 is a side view of the chain receiver according to the embodiment, FIG. FIG. 6, an external side view of the crank, shows a conventional example. 5... Crank arm, 5b... Sprocket support part (sprocket support arm part), 6, 7... Large diameter sprocket, 8... Inner sprocket (minimum diameter sprocket), 11... (Inner sprocket) fixing bolt, 11a... Pin Insertion hole, 12... chain receiver, 12b... pin.

Claims

[Claims for Utility Model Registration] A sprocket having at least one large-diameter sprocket and at least one small-diameter sprocket, with the innermost sprocket disposed on the innermost side integrally extending in the radial direction from the base end of the crank arm. A bicycle gear crank is bolted to an outwardly extending sprocket support, and the fixing bolt of the inner sprocket is provided with a pin insertion hole that opens at least at an axially inner end of the sprocket. At the same time, a substantially ring-shaped chain receiver having a pin protruding from the outer surface in the direction of the crankshaft is arranged inside the inner sprocket, and the pin is inserted into the pin insertion hole of the fixing bolt, A bicycle gear crank that is characterized by being attached to a sprocket.