Abstract: The present invention discloses a zipper structure, relates to the field of bags, and is composed of at least one group of zipper. The zipper comprises pull pieces and a pull head; one end of the pull pieces is matched with a box lock for locking, characterized in that limiting structures matched with each other are arranged between the pull pieces of the zipper; and the pull pieces are limited through the matching of the limiting structures. In this way, when one end of the pull head of a group of zipper is closed and one end of the pull pieces is matched and locked with the box lock, the pull pieces of the group of zipper are closed with each other. Because the limiting structures matched with each other are also arranged between the pull pieces, a pair of pull pieces that are closed with each other are limited jointly by the box lock and the limiting structures under the limit of the limiting structures.

Abstract: The present invention relates to a detachable roller means and a movable bag or case having said detachable roller means, said roller means comprises a roller seat (1) and a roller assembly, which are detachably connected to each other. The roller seat has a penetration opening (1-1) and a guide in which a spring-pretensioned button plate (2-10) is guided. Said button plate has a button arm (2-3), by means of which the button plate is displaceable along the guide. The roller assembly has a roller holder and a roller (3). The roller holder is provided on its upper side with a lug boss (2-5) and a shaft (2-8) projecting from the lug boss. The shaft is provided with an upper stop (2-9). In a mounting status, the lug boss is abutted against the bottom of the roller seat tightly and, viewed in the insertion direction of the shaft, the button plate is engaged behind the upper stop in a spring-pretensioned manner.