| 摘要 |
An expandable shell of a suitcase includes first and second surrounding shell bodies mated with and stackable on each other and cooperatively defining an expandable accommodation chamber for increasing the volume of the suitcase. A control unit includes a pulling cord secured to the first surrounding shell body and reeled on a reel member that is mounted to the second surrounding shell body, and a pawl and ratchet teeth disposed to control the rotation of the reel member so as to adjust a distance between the first and second surrounding shell bodies and the volume of the expandable accommodation chamber.
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