Patent ID: 11891228
Assignee: CHANGZHOU BESTFULL MOULD & PLASTICS CO., LTD
Field: Handling (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 7:
8. The automatic air-extracting sealing box cover according to claim 1, wherein an edge of the top cover is provided with an annular groove with an opening facing down and an edge of the bottom cover is provided with an annular protruding ridge facing up, the protruding ridge is correspondingly mounted in the groove, a circle of expansion water-resistant filling rope is filled in the bottom of the groove and a sealing rubber ring is mounted outside the expansion water-resistant filling rope; and
the protruding ridge is provided with a horizontal protruding block, a hole corresponding to the protruding block is opened on a wall of the groove, and the protruding block is located in the hole in the connecting state of the bottom cover and the top cover.