HOLDER FILTER FOR MACHINES FOR PREPARING BEVERAGES Russian patent published in 2018 - IPC A47J31/44 

FIELD: food industry.

SUBSTANCE: invention relates to a filter holder comprising a filter housing comprising a bottom and a dispensing channel or an opening in said bottom. The valve with the valve plug is configured to selectively open and close the dispensing channel or the opening, the valve plug being supported by a rotary arm and is elastically biased towards the closed position. The valve plug closes the opening when the filter holder is attached to the hot water dispensing unit of the machine for preparing a beverage, in order to soak a beverage ingredient, e.g. powdered coffee, loaded in the filter cup, with hot pressurised water. The valve is calibrated in such a way that it opens when a certain pressure is reached in the filter cup. After opening, the valve plug will remain open regardless of the pressure inside the filter cup, due to the device described below in this document. The filter holder additionally comprises a cam disposed between the filter housing bottom and the rotary arm supporting the valve plug. The cam has a profile interacting with the rotary arm. The cam is made movable, preferably around a rotation axis or a hinge axis for selectively mounting in various positions. In particular, the cam has at least a first position, in which the cam profile prevents the movement to close the valve plug, and a second position, in which the cam profile allows the movement to close the valve plug. The cam is elastically pre-loaded towards the first position by a suitable resilient element, e.g. a spring, such as a torsion spring. The filter holder additionally comprises a slider interacting with the cam to move the cam from the first position to the second position, with overcoming the elastic action applied to the cam. The slider is preferably elastically pre-loaded in the off position and is urged to move in the working position direction by means of direct or indirect interact with the water dispensing unit, to which the filter holder is attached. The slider is made and positioned in such a manner that during said movement from the off position to the working position, it pushes the cam in the direction of the second position, i.e., the cam position allowing to close the valve plug. The elastic force applied to the slider is overcome by the interaction of the slider with the above fixed element. When the interaction with the fixed element ends, the slider elastically returns to the off position.

EFFECT: increased operational reliability.

25 cl, 28 dwg