Filter Holder Cam Mechanism for Stable Brewing Valve Opening
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Solution Overview
Problem
Existing filter holders for beverage-producing machines, such as espresso machines, fail to maintain the valve stopper in an open position consistently after reaching brewing pressure, leading to inefficient coffee dispensing and user intervention for valve control.
Innovation Solution
A filter holder design featuring a cam mechanism with a pivoting arm and slider, where the cam moves from a position preventing closure to allowing closure of the valve stopper, and remains in the open position due to friction, ensuring the valve remains open once sufficient brewing pressure is achieved, and automatically closes upon pressure reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resiliently biased valve stopper is used to close the dispensing aperture, then the valve can be calibrated to open at a certain brewing pressure, but the valve stopper cannot remain consistently open after pressure is achieved, requiring user intervention
Solution Approach 1:
The cam mechanism automatically maintains the valve stopper in the open position through its geometric profile and frictional engagement with the pivoting arm, eliminating the need for user intervention to hold the valve open during brewing. The system self-regulates based on the brewing pressure that triggered the valve opening.
Solution Approach 2:
The cam is pre-configured with specific profile geometry that anticipates the need to maintain valve openness. When the valve stopper opens due to brewing pressure, the cam profile automatically engages with the pivoting arm to prevent reclosure, preparing the system in advance for sustained brewing operation.
2Extent of automation
If a cam mechanism is introduced to control valve stopper position, then automatic valve control is achieved, but the device complexity increases with additional components
Solution Approach 1:
The cam mechanism serves multiple functions simultaneously: it detects valve opening through the pivoting arm's movement, maintains the open position through frictional engagement, and prevents reclosure through its geometric profile. This multi-functionality reduces the need for separate control components.
Solution Approach 2:
The pivoting arm acts as an intermediary element that translates the valve stopper's opening movement into cam engagement. This mediator allows the cam mechanism to respond indirectly to pressure changes, simplifying the control architecture while achieving automatic regulation.
3Productivity
If the cam profile allows closing movement of the valve stopper, then the valve can close upon pressure reduction, but the valve may close prematurely during brewing
Solution Approach 1:
The cam profile has differentiated local characteristics: one section with high friction engagement that prevents closing during brewing, and another section that allows controlled closing when pressure drops. This spatial variation in friction properties ensures the valve remains open during the brewing phase while permitting closure at the appropriate time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures consistent and automatic valve control, eliminating the need for user intervention and maintaining the valve open during brewing, while preventing closure until the end of the brewing cycle, enhancing the efficiency of coffee production.
Implementation Method 1
The cam is resiliently biased towards the first position by a suitable resilient member, for example a spring, such as a torsion spring
Implementation Method 2
The cam is retained in the second position by the friction force between the cam and the pivoting arm which supports the valve stopper
Data Source
AI summary
A filter holder including a housing with a bottom and an aperture through the bottom; a valve with a stopper for opening and closing the aperture, the stopper supported by a pivoting arm and biased towards a closed position; a cam arranged between the bottom and the pivoting arm, and having a cam profile co-acting with the pivoting arm, and being biased towards a first position wherein the cam profile prevents closing of the stopper and having a second position wherein the cam profile allows closing of the stopper; a slider which co-acts with the cam to move the cam from the first position towards the second position. The slider is biased in an inactive position and is moved towards an active position by co-action with a locking ring whereto the filter holder is attached. The slider when moved towards the active position pushes the cam towards the second position.