Container Cover That Facilitates Creating Negative Pressure and Long Time Sealing

A container cover, comprising a rotary device, an outer cover member, an inner cover member, a first guide block, a second guide block, a pumping piston, a piston seat, a check valve and a first spring member, wherein:

• said rotary device is rotatably coupled to said outer cover member and fixedly connected with said first guide block;
• said outer cover member is fixedly connected to said inner cover member, said outer cover member comprising a plurality of axially extending guide grooves;
• said inner cover member is mounted with a packing gasket, said packing gasket being set between said inner cover member and said outer cover member and adapted for sealing a container in an airtight manner when said outer cover member is covered with said inner cover member on said container;
• said first guide block comprises a plurality of guide rods;
• said second guide block is fixedly fastened to said pumping piston, comprising a first continuous wave-shaped track disposed in contact with said guide rods at a bottom side for causing said guide rods to move along said first continuous wave-shaped track of said second guide block and said second guide block to move up and down when said first guide block is rotated by said rotary device, said first continuous wave-shaped track of said second guide block comprising a plurality of low-elevation points and a plurality of high-elevation points, each said low-elevation point of said first continuous wave-shaped track rising gradually to one respective said high-elevation points of said first continuous wave-shaped track, each said high-elevation point of said first continuous wave-shaped track descending gradually to one respective said low-elevation point of said first continuous wave-shaped track;
• said pumping piston is adapted for reciprocation in a piston groove of said piston seat axially, comprising a plurality of constraint blocks respectively coupled to said axially extending guide grooves of said outer cover member for vertical movement and an external mounting groove extended around the periphery thereof and mounted with a first gasket ring;
• said piston seat is fixedly fastened to said cover member, comprising a piston groove that accommodates said pumping piston and allows said pumping piston to reciprocate therein, a second gasket ring mounted around the periphery thereof, and an air-pumping hole cut through a bottom wall thereof;
• said check valve is mounted in said air-pimping hole of said piston seat;
• said first spring member is mounted between said piston seat and said pumping piston;
• when said rotary device is driven by an external force to rotate said first guide block, said guide rods are moved along said first continuous wave-shaped track, causing said second guide block and said pumping piston to move alternatively up and down in said piston groove of said piston seat and to further pump air out of said container through said air-pimping hole of said piston seat.

A container cover, comprising a rotary device, an outer cover member, an inner cover member, a first guide block, a second guide block, a pumping piston, a piston seat, a check valve and a first spring member, wherein:

• said rotary device is rotatably coupled to said outer cover member and fixedly connected with said first guide block;
• said outer cover member is fixedly connected to said inner cover member, said outer cover member comprising a plurality of axially extending guide grooves;
• said inner cover member is mounted with a packing gasket, said packing gasket being set between said inner cover member and said outer cover member and adapted for sealing a container in an airtight manner when said outer cover member is covered with said inner cover member on said container;
• said first guide block comprises a plurality of guide rods;
• said second guide block is fixedly fastened to said pumping piston, comprising a first continuous wave-shaped track disposed in contact with said guide rods at a bottom side for causing said guide rods to move along said first continuous wave-shaped track of said second guide block and said second guide block to move up and down when said first guide block is rotated by said rotary device, said first continuous wave-shaped track of said second guide block comprising a plurality of low-elevation points and a plurality of high-elevation points, each said low-elevation point of said first continuous wave-shaped track rising gradually to one respective said high-elevation points of said first continuous wave-shaped track, each said high-elevation point of said first continuous wave-shaped track descending gradually to one respective said low-elevation point of said first continuous wave-shaped track;
• said upper rail seat is fixedly fastened to said second guide block and said pumping piston, comprising a second continuous wave-shaped track disposed in contact with said guide rods of said first guide block at a top side, said second continuous wave-shaped track of said upper rail seat comprising a plurality of low-elevation points and a plurality of high-elevation points, each said low-elevation point of said second continuous wave-shaped track rising gradually to one respective said high-elevation points of said second continuous wave-shaped track, each said high-elevation point of said second continuous wave-shaped track descending gradually to one respective said low-elevation point of said second continuous wave-shaped track;
• said pumping piston is adapted for reciprocation in a piston groove of said piston seat axially, comprising a plurality of constraint blocks respectively coupled to said axially extending guide grooves of said outer cover member for vertical movement and an external mounting groove extended around the periphery thereof and mounted with a first gasket ring;
• said piston seat is fixedly fastened to said cover member, comprising a piston groove that accommodates said pumping piston and allows said pumping piston to reciprocate therein, a second gasket ring mounted around the periphery thereof, and an air-pumping hole cut through a bottom wall thereof;
• said check valve is mounted in said air-pimping hole of said piston seat;
• said first spring member is mounted between said piston seat and said pumping piston;
• when said rotary device is driven by an external force to rotate said first guide block, said guide rods are moved along said first continuous wave-shaped track, causing said second guide block and said pumping piston to move alternatively up and down in said piston groove of said piston seat and to further pump air out of said container through said air-pimping hole of said piston seat.