Brewing apparatus
First Claim
1. Brewing apparatus for preparing a beverage, especially for a coffee machine, of the type having a brewing piston, a brewing cylinder containing an ejection piston, lateral guiding and holding plates including grooves for guiding said brewing cylinder and for mounting individual components of said brewing apparatus, supply means for supplying scalding water to said brewing cylinder, and discharge means for the beverage, wherein the improvement comprises:
- a guide means disposed concentrically with said brewing piston for axial guidance thereof,first drive means disposed concentrically with said guide means for bringing said brewing piston into a predetermined brewing position, variable with respect to said brewing cylinder,control elements connected to said first drive means for controlling a swivel movement of said brewing cylinder from a filling position into said brewing position, anda driving mechanism movable with respect to said brewing cylinder for moving said ejection piston within said brewing cylinder in such a way that said ejection piston travels a step-up geared path with respect to said driving mechanism.
1 Assignment
0 Petitions
Accused Products
Abstract
The brewing apparatus (2) comprises lateral guiding and holding plates (6, 7) for securing and guiding individual components thereof. A movable brewing piston (39) is guided in a cylindrical guideway (8) provided with an external thread (93). A nut (9) rotatable on the guideway has teeth (10) at its periphery and is moved on the guideway by a motor-driven, elongated gearwheel (11). Lateral guide arms (14, 15) engage the nut and the brewing piston and control the pivoting movement of a brewing cylinder (82). The brewing cylinder has two arms provided with teeth (86, 87), these arms co-operating with a drive part (26) for moving an ejection piston (107) in the brewing cylinder. The drive part for the ejection piston is designed in such a way that it travels only half as far as the ejection piston and thus allows the coffee machine to have less headroom. The displacement of the brewing piston, and hence its brewing position, is electronically detected and makes possible an exact determination of the variable brewing volume, thus optimum adaptation of the brewing chamber to the preselected amount of ground coffee. The drive disposed concentrically with the axis of the brewing piston prevents tilting of the drive facility.
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Citations
23 Claims
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1. Brewing apparatus for preparing a beverage, especially for a coffee machine, of the type having a brewing piston, a brewing cylinder containing an ejection piston, lateral guiding and holding plates including grooves for guiding said brewing cylinder and for mounting individual components of said brewing apparatus, supply means for supplying scalding water to said brewing cylinder, and discharge means for the beverage, wherein the improvement comprises:
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a guide means disposed concentrically with said brewing piston for axial guidance thereof, first drive means disposed concentrically with said guide means for bringing said brewing piston into a predetermined brewing position, variable with respect to said brewing cylinder, control elements connected to said first drive means for controlling a swivel movement of said brewing cylinder from a filling position into said brewing position, and a driving mechanism movable with respect to said brewing cylinder for moving said ejection piston within said brewing cylinder in such a way that said ejection piston travels a step-up geared path with respect to said driving mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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- 20. A coffee machine having brewing apparatus comprising a brewing piston, a brewing cylinder containing an ejection piston, lateral guiding and holding plates including grooves for guiding said brewing cylinder and for mounting individual components of said brewing apparatus, supply means for supplying scalding water to said brewing cylinder, and discharge means for the beverage, a guide means disposed concentrically with said brewing piston for axial guidance thereof, first drive means disposed concentrically with said guide means for bringing said brewing piston into a predetermined brewing position, variable with respect to said brewing cylinder, control elements connected to said first drive means for controlling a swivel movement of said brewing cylinder from a filling position into said brewing position, and a driving mechanism movable with respect to said brewing cylinder for moving said ejection piston within said brewing cylinder in such a way that said ejection piston travels a step-up geared path with respect to said driving mechanism.
Specification