Abstract: A retaining device is composed of a male retainer, a female retainer, and a lock. The male retainer is provided with a retaining tongue. The female retainer is provided with a base and a retaining piece. The lock is fastened with the rear section of the retaining piece. Located at the junction of the retaining piece and the lock is a shaft by which the lock and the retaining piece are fastened pivotally with the base in conjunction with a spring. The retaining piece and the lock act simultaneously. The lock serves to lock or unlock the retaining device. The lock also serves to buckle or unbuckle the male retainer and the female retainer of the retaining device.

Abstract: A chain lock for locking the wheel of a motorcycle or bicycle and a series of travelling certificates is provided. The chain lock includes a locking body having a combination locking device and a novel locking mechanism disposed therein, a chain or a flexible wire having at a first end an obturator embedded into the locking body and controlling the activity of the locking mechanism in cooperation with the combination locking device and a plug at a second end of the chain which is lockable by a latch and ejectable from the locking body by an ejector when the plug is unlockable. The obturator is operated as a hiding key for enhancing the anti-burglar effect of the chain lock.