Pressure cover supporting structure for tank, has covering body with teeth that are locked in grooves of stop collar of supporting body to form bayonet coupling when covering body is screwed in supporting body to attain sealing position

摘要

The structure has a supporting body (1) including a stop collar (6) with a filter. Two symmetrical grooves (7, 8) and two additional grooves (10, 11) are provided on the collar walls. A covering body (2) rotates between sealing and opening positions such that teeth provided on inner wall of the body (2) are locked in the grooves to form a bayonet coupling when the body (2) is screwed in body (1) to attain the sealing position.