Infusion beverage brewing device

An infusion beverage brewing device, comprising:

• a filter assembly having an outer filter cup and an inner filter cup, the outer filter cup having an outer cup-body, a first upper edge formed on a top of the outer cup-body, the outer cup-body having a bottom outlet disposed with a sealing device;
• the inner filter cup having an inner cup-body, a top of the inner cup-body having a second upper edge, a filter screen disposed at a bottom of the inner cup-body, the top of the inner cup-body disposed with a vapor inlet, the inner cup-body of the inner filter cup received in the outer cup-body of the outer filter cup, the second upper edge stacked on the first upper edge, a gap formed between the inner cup-body and the outer cup-body, a vapor diffusion outlet disposed between the inner cup-body and the outer cup-body, and the vapor diffusion outlet connecting with the vapor inlet, and
• a brewing mechanism having a cup retainer, a cover and a controlling device, the cover disposed on the cup retainer, the controlling device connected to the cover, the filter assembly placed in the cup retainer, the upper edge of the outer filter cup disposed on the cup retainer, the cover selectively disposed on the filter assembly, the cover disposed with a sprinkle-nozzle and a vapor portal thereon, and the vapor portal corresponding to the vapor inlet of the inner filter cup;
• wherein the controlling device comprises a fixed base, a handle, a tension spring and a link member, the fixed base is connected to the cup retainer, one end of the handle is pivotally connected to the fixed base, the tension spring is connected between the fixed base and the cover, the fixed base is disposed with a first positioning point, the cover is pulled upward to contact the first positioning point by the tension spring, and the link member is disposed between the handle and the cover;
• wherein the link member comprises an upper link member, a lower link member, a first pivot axis, a second pivot axis, and a plurality of disc springs, one end of the upper link member is connected to one end of the handle, one end of the lower link member is pivotally connected to the other end of the upper link member through the first pivot axis, the second pivot axis is pivotally connected to the other end of the lower link member, a washer is disposed between the second pivot axis, the top of the cover is disposed with a connecting base, the connecting base is disposed with a stud thereon, the plurality of disc springs are disposed between the washer and the connecting base, and the stud penetrates the plurality of disc springs and the washer and is fixed by a nut.