Fastening device and article assembly having the same

An article assembly comprising:

• a first article;
• a second article;
• a lower engaging hook provided on said first article and including a push portion, and at least one first hook portion spaced apart from and disposed below said push portion,
• at least one pair of spaced-apart fixing plates provided on said second article which is disposed above said first article, and
• at least one upper engaging hook connected pivotally to and disposed between said fixing plates, and including first and second arms formed as an inverted L-shaped configuration, said first arm extending downwardly from said second arm and having a second hook portion to engage detachably said first hook portion, said second arm being engageable with said push portion, said upper engaging hook being pivotal to move said second hook portion to engage said first hook portion when said push portion engages and pushes upward said second arm, and being pivotal to move said second hook portion away from said first hook portion when said push portion disengages from said second arm;
• wherein said upper engaging hook further includes two resilient clamp members projecting downwardly from said second arm and cooperatively defining a clamping groove to receive and engage releasably said push portion;
• and wherein each of said fixing plates includes a pivot groove, said upper engaging hook further including two opposite pivot pins provided at a junction between said first and second arms and journalled respectively to said pivot grooves of said fixing plates, and a corner formed at said junction and having an outer slanting face.