Daido Kogyo Co., Ltd.

Hiroaki Oku

Hideaki Seki

Motoki Tanaka

Kota Tanaka

A fixed-side support arm () of a torsion coil spring () is provided with a locking portion () and a pressing portion (). The locking portion () is housed in a recessed spring housing portion () provided in a lever (), and an engaging portion () abuts against the locking portion () to lock a biasing force of the spring. A pressing force (F) is applied to the pressing portion () to remove the locking portion () from the spring housing portion (), thereby releasing the locking by the engaging portion ().

Chain tensioner

A back face of each inner link plate of the chain is curved convexly. Heights from a pitch line connecting centers of pin holes of inner and guide link plates to the convex apex portion of the inner link plate and to an apex portion of the guide link plate are equalized. The convex apex portions are brought into contact with a guide face of the chain guide per every pitch and the ear apex portions are brought into contact with the chain guide per every pitch while being shifted by a half pitch from the convex apex portions.

Growing community of inventors

Ishikawa Pref., Japan

Hiroaki Oku