This invention provides a locking device sustaining high pressure in a coffee
maker which comprises a brew head assembly which comprises: a slide assembly, a
sealing assembly and a pop-up and roll-back assembly, operatively linked to sustain
pressure up to four (4) bars. Furthermore, this invention provides a method for
one-hand operation on the locking of a coffee maker comprising steps of: a) Using
one hand to put the lever forward to release the lock which is controlled by two
parts, the slider and the three mounts on the brew base wherein the back-and-forth
movement of the slider will produce the action of locking and releasing; b) Moving
the lever forward, produce the push rod that is assembled on the slider will push
the slider forward so the brew head is released; c) Putting back the lever, the
push rod will put back the slider so the brew head is locked; and d) after releasing
the lock, the lift platform will pop up by the lift platform spring and the lid
mount roll up by the hinge spring.