Abstract: A retaining device including a group of circular placed thorns and a mechanism functioned to push out, lock, unlock and restore the thorns. The retaining device is mounted at the end of the extendable sleeve member of a bar shaped steering wheel lock. The thorns are unlocked and restored automatically when the extendable sleeve member is restored.

Abstract: A lock core includes a rotation mechanism and a clutch mechanism for separating the unlocking and opening processes of locks and prevents the lock from being unlocked destructively. The rotation mechanism comprises a plug and a plug sleeve. The clutch mechanism comprises a group of discs and a sidebar. The rotation mechanism is triggered by the clutch mechanism. Therefore the primary key for the clutch mechanism locks/unlocks the rotation mechanism. A secondary key is introduced for turning the rotation mechanism to open the lock core. The primary key and the secondary key are combined by another mechanism comprises two slots, two rivets and a spring.

Abstract: A bar shaped steering wheel lock including two “L” shaped hooks obliquely attached on the lock body, an interior rod covered by trapezoidal thread for connecting the two hooks, a locking mechanism and an extendable sleeve. The trapezoidal thread allows the rod to be locked in position by the locking mechanism. The steering wheel lock is mounted firmly on a steering wheel by firstly inserting the two hooks into the holes on the wheel and secondly by stretching the two hooks until both the two hooks are secured on the arms within the rim of the steering wheel allowing the sleeve to be extended outward. The extended sleeve thus blocks the complete rotation of the steering wheel.