| 摘要 |
A coffee maker comprises a height adjustment mechanism for accommodating mugs with different heights including an internal casing, a gear in the casing, a column secured to the brewing assembly and the casing, the column including a rack meshed the gear, a staged knob seat interconnected the casing and the housing, the knob seat including flutes around inner surface of an outer stage, a shaft inserted through the knob seat to connect the gear, a knob including a receptacle securely engaged head of the shaft, upper and lower recesses the receptacle disposed therebetween, and two push buttons each including a spring-biased trigger partially projected from the recess, and a ridge engaged a valley of the teeth. Pressing the triggers into the recesses until the ridges clear the flutes, and turning the knob and the shaft will rotate the gear to raise or lower the rack and the brewing assembly.
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