| 摘要 |
PURPOSE:To make housing or conveyance easy, by installing a spring between a pin link and a roller link abutting each other, while contracting a roller chain automatically by contractile force of the spring. CONSTITUTION:In each spring 40, its one end is extendedly installed in an outer end part of one pin 31, while the other end is extendedly installed in an outer end part of another pin 31 located at the same position as the said pin 31 of anther pin link 30 adjoining to the pin link 30 in which the one end is extendedly installed as aforesaid. With this constitution, when being not extendedly installed in a sprocket wheel yet, each spring 40 is automatically contracted, making housing or conveyance easy, while in case of being used upon installation in the sprocket wheel, adjustment by a chain tightener or an idler becomes useless. |
