Food Processor Spindle Brake Layout for Rapid Lid-Open Stopping
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Solution Overview
Problem
Existing motorized household appliances for food processing face challenges in efficiently and safely stopping the working tool upon lid removal, often requiring complex designs and increased braking forces due to multiple gliding surfaces.
Innovation Solution
A motorized household appliance with a friction member located in the lower region of the spindle, made of high-friction material like rubber, which rapidly decelerates the spindle by tilting and contacting a circular friction surface, reducing energy loss and production complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a friction member is arranged between the spindle and pin for rapidly stopping the rotation of the spindle when the lid is lifted, then user safety is improved, but braking forces increase due to two gliding surfaces
Solution Approach 1:
The friction member is extracted from the lid structure and relocated to the lower region of the spindle. This removes the friction interface from the lid, eliminating the need for friction members built into the lid and reducing the overall braking force requirements while maintaining safety functionality.
Solution Approach 2:
Instead of having the friction member in the lid acting on the spindle from above, the friction member is placed on the spindle itself at the lower region. This inverts the traditional arrangement where the lid contained the friction mechanism, thereby simplifying the lid design and reducing braking forces during operation.
2Reliability
If friction members are built into the lid as in known solutions, then automatic stopping function is achieved, but device complexity increases significantly
Solution Approach 1:
The friction member is extracted from the lid and relocated to the spindle. This simplifies the lid design by removing the complex friction braking mechanism from it, while the spindle design absorbs the friction member in a simpler configuration that achieves the same automatic stopping function.
Solution Approach 2:
The spindle itself serves the dual function of rotating the working tool and housing the friction member for automatic stopping. By making the spindle self-sufficient in providing both rotational function and safety braking function, the need for complex lid-integrated friction mechanisms is eliminated.
3Reliability
If multiple gliding surfaces are used for friction braking, then stopping capability is improved, but energy loss increases
Solution Approach 1:
One of the two gliding surfaces is removed by extracting the friction member from the lid. This leaves only a single gliding surface between the friction member on the spindle and the pin, thereby reducing energy loss while maintaining adequate stopping capability through optimized friction material and contact geometry.
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 achieves rapid deceleration of the spindle and working tool within 1.5 seconds, enhancing user safety and efficiency by minimizing friction forces and heat buildup, while simplifying the design and reducing production costs.
Implementation Method 1
a friction member arranged between the spindle and the pin for rapidly stopping the rotation of the spindle when the lid is lifted from the processing bowl
Data Source
Figure 1~2
Figure 3~4
AI summary
A motorized household appliance (1) for processing food comprising at least: a processing bowl (1), a lid (2) for preventing access of the user to the working tool (5) and holding the processed food within the processing bowl (8) during operation, a spindle (3), a pin (7) supporting the spindle (3), a clutch (4) connecting the spindle (3) to the driving means of the appliance (1), a working tool (5) attached to the spindle (3), a friction member (6) arranged between the spindle (3) and the pin (7) for rapidly stopping the rotation of the spindle (3) when the lid (2) is lifted from the processing bowl (8), wherein the spindle (3) is supported by the pin (7) on its circumference in the bottom third (10) of the height of the spindle (3) as measured from the bottom of the processing bowl (8) and that the spindle (3) is supported through a single gliding surface (11), wherein the friction member (6) is located either on the inner cavity of the spindle (3) or on the pin (7).