Planetary Dough-Mixing Hook and Counter-Tool for Low-Load Kneading
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Solution Overview
Problem
Existing household food preparation appliances with kneading hooks and counter-tools face issues where the counter-tool generates significant forces that overload the motor, leading to potential heating and damage, especially when used with less powerful motors and other tools.
Innovation Solution
A counter-tool design where the lower end is positioned at the height of the kneading hook's end, with a raised part extending over 20% of the hook's height, and an elongated cross-section with a tapered leading edge, allowing efficient dough shearing without overloading the motor, and enabling use with other tools without collision risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the counter-tool comes close to the bottom of the container and the peripheral wall, then good kneading quality is achieved, but the motor is heavily loaded causing significant heating and potential destruction
Solution Approach 1:
The counter-tool features a raised part that creates different functional zones: an active kneading zone near the bottom and wall for effective dough processing, and a reduced-zone area where the tool lifts away to minimize motor loading. This local differentiation allows the tool to provide intensive kneading where needed while reducing overall mechanical stress on the motor.
Solution Approach 2:
The counter-tool is designed with a raised part that causes it to dynamically lift away from the bottom and peripheral wall during rotation, creating a variable engagement pattern. This dynamic movement allows the tool to intermittently contact the dough for effective kneading while periodically disengaging to reduce motor load and prevent overheating.
2Reliability
If the counter-tool has a working branch significantly lower than the hook, then it prevents dough from rising along the hook, but it does not shear and/or stretch the dough so that it does not participate in the kneading
Solution Approach 1:
The counter-tool combines two functional zones in one structure: a lower portion that prevents dough from rising along the hook, and an upper raised part that actively participates in shearing and stretching the dough. This local differentiation allows the tool to simultaneously control dough position and provide mechanical kneading action.
Solution Approach 2:
The counter-tool is designed to perform multiple functions: preventing dough from rising along the hook, shearing the dough, stretching the dough, and participating in kneading. This multi-functionality is achieved through the raised part that extends into the dough processing zone while maintaining the preventive function of the lower portion.
3Productivity
If the counter-tool is designed to work closely with the kneading hook, then effective kneading is achieved, but it cannot be used with other types of work tools such as mixer tools or whisks without risk of collisions
Solution Approach 1:
The counter-tool features an asymmetric raised part that is positioned and shaped to optimize kneading performance with the kneading hook while maintaining clearance from other tool types. The asymmetric design allows the tool to engage effectively with the hook's planetary motion while creating a safety zone that prevents collisions with mixer tools or whisks.
Solution Approach 2:
The raised part of the counter-tool is positioned to preliminary engage with the dough and guide it away from the peripheral wall before the kneading hook reaches its lowest point. This preliminary action prevents the hook from contacting the wall and reduces the risk of collision with other tools that may be used in the same container.
Data Source
Figure 1~2
Figure 3~6
Figure 7
AI summary
The invention relates to a household food preparation apparatus comprising a vessel (2) including a bottom (20) having a peripheral wall (21) mounted thereon, which is open at the top end thereof, a dough-mixing hook (5) dipping into the vessel (2) and being rotated by a motor in a planetary motion, and a counter-tool (6) attached to a rotary plate (4), the counter-tool (6) comprising a working arm (61) having a lower end (61A) dipping into the vessel (2), said hook (5) comprising a working arm (51) including a bent lower portion placed near the bottom (20) of the vessel (2) and being extended by a raised portion, characterised in that the height h2 of the working arm (61) of the counter-tool (6) is at least 20% lower than the height h2 of the working arm (51) of the hook (5) and in that the raised portion of the hook (5) comprises an end (51D) momentarily occupying, with each rotation of the hook (5) on the axis thereof, a so-called crossing position in which the end (51D) of the hook (5) is close to the lower end (61A) of the counter-tool (6).