Structure for locking and releasing sheet-like object and packaging storage container

A structure for locking and releasing a sheet-like object, comprising:

• an accommodating portion;
• for accommodating the object;
• and
• a pressing member assembly, arranged at a center of the accommodating portion, and protruding upward from a bottom of the accommodating portion to pass through a central hole of the object and hold the object in the accommodating portion,
• wherein the pressing member assembly comprises:
• a plurality of snap fasteners for fixing the object;
• a plurality of push sheets for pushing the object;
• a pressing member body;
• and a pressing sheet;
• the pressing sheet is formed at a top center of the pressing member assembly and is in a flat-plate shape for a user to press downward;
• the snap fasteners and the push sheets are respectively flexibly connected with the pressing member body and the pressing sheet, so that the snap fasteners and the push sheets are rotatable when the pressing sheet is moved up and down, and
• wherein the snap fasteners and the push sheets extend radially between the pressing member body and the pressing sheet, wherein a radial distal end of each snap fastener is flexibly connected to the pressing member body or is integrally formed with the pressing member body, and a radial proximal end of each snap fastener is connected to the pressing sheet;
• wherein a radial proximal end of each push sheet is connected to the pressing sheet,
• wherein each snap fastener comprises:
• a snap tooth, a first connecting portion and a second connecting portion;
• the snap tooth is vertically arranged and is provided with a hook member which protrudes outward radially, the snap tooth is flexibly connected with the pressing member body and the pressing sheet through the first connecting portion and the second connecting portion, and the soap tooth is rotatable relative to the first connecting portion and the second connecting portion at flexible connections with the first connecting portion and the second connecting portion, and the second connecting portion is rotatable relative to the pressing sheet at a flexible connection with the pressing sheet,
• wherein the hook members is arranged in a horizontal direction when the pressing sheet is un-pressed, and a maximum radial distance among the hook members in the horizontal direction formed at the top of the pressing member assembly is D, which is greater than a diameter of the central hole of the object, a projection length of the second connecting portion on a horizontal plane is C, and an inclination angle A° is formed between the second connecting portion and the pressing sheet when the pressing sheet is on-pressed,
• wherein, when the pressing sheet moves downward toward the bottom of the accommodating portion under a downward force, the pressing sheet can rotate relative to the second connecting portion at the flexible connection with the second connecting portion, so that the inclination angle becomes A1°, and A1°<A°, the projection length of the second connecting portion on the horizontal plane is C1, and C1<C, so that the second connecting portion is driven to move downward and rotates relative to the snap tooth at a flexible connection with the snap tooth to pull the snap tooth downward, and the snap tooth rotates downward relative to the first connecting portion at the flexible connection with the first connecting portion, so that the hook members of the snap teeth rotates upward, the maximum radial distance becomes D1 from D, and D1 is less than D and is less than the diameter of the central hole of the object,
• wherein, when the downward force on the pressing sheet is released, the inclination angle is restored to A°, and the projection length of the second connecting portion on the horizontal plane is restored to C, so that the pressing sheet moves upward and is restored to an initial position so as to drive the hook members to be restored to initial horizontal positions, and the maximum radial distance is restored to D,
• wherein each push sheet comprises:
• an upper push portion, a support and an push sheet connecting portion, the upper push portion is horizontally arranged and is lower than a horizontal position of the pressing sheet, a radial distal end of the upper push portion is an upper push portion free end and protrudes upward for pushing the object upward, the support is vertically arranged, and a lower portion of the support is flexibly connected to a radial proximal end of the upper push portion, a lowest end of the support is arranged to abut against an upper surface of the accommodating portion, an uppermost end of the support is flexibly connected to one end of the push sheet connecting portion, and another end of the push sheet connecting portion is flexibly connected to the pressing sheet,
• wherein a maximum radial distance between the upper push portion free ends of the plurality of push sheets in the horizontal direction is greater than the diameter of the central hole of the object, horizontal positions of the upper push portion free ends of the plurality of push sheets are arranged lower than the horizontal positions of the hook members when no force is applied, and a vertical height difference between the upper push portion free ends and the hook members is at least equal to a thickness of the object,
• wherein, when the pressing sheet moves downward toward the bottom of the accommodating portion under a downward force, the pressing sheet rotates relative to the push sheet connecting portion at the flexible connection with the push sheet connecting portion, an inclination angle between the pressing sheets and the push sheet connecting portion becomes less, so that the push sheet connecting portion is further driven to move downward and the lowest end of the support is arranged to abut against an upper surface of the accommodating portion, and the upper push portion free ends pivot upward around the lowest end of the support and push the object to move upward, and
• wherein, when the downward force on the pressing sheet is released, the pressing sheet moves upward and is restored to the initial position so as to drive the hook members to be restored to the initial horizontal positions, and thus the upper push portion free ends pivot downward around the lowest end of the support to be restored to the initial horizontal positions.