Lever-Gear Drive Assembly for Controlled Implement Rotation
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Solution Overview
Problem
Existing drive mechanisms for kitchen utensils and similar devices lack efficient force transmission systems that allow for smooth and directional control of rotational motion, leading to suboptimal performance in food processing tasks.
Innovation Solution
A drive unit comprising a housing with an actuating lever and a force transfer mechanism that pivots about a first axis, rotating an output shaft about a second perpendicular axis, allowing for controlled and directional force transmission, and includes a handle member that moves between unfired and fired positions to engage gears that adjust torque and direction of rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional drive mechanism is used, then the structure is simple, but the force transmission efficiency and directional control are insufficient
Solution Approach 1:
The patent introduces a lever arm that moves in a planar trajectory perpendicular to the axis of the output shaft. This dimensional change allows the conversion of linear lever motion into rotational motion of the output shaft, achieving efficient force transmission while maintaining a relatively simple structure. The lever bearing guides the lever through a controlled arc-shaped path, optimizing the force transmission angle throughout the rotation cycle.
Solution Approach 2:
The lever acts as an intermediary element between the actuating force and the output shaft. By introducing this intermediate component with a specific trajectory, the patent enables smooth directional control and efficient torque transmission. The lever bearing serves as another intermediary that constrains the lever's motion to the optimal path, ensuring continuous engagement and preventing impact loads.
2Power
If the actuating lever passes through the centerline of the output shaft, then the force transmission is direct, but it interferes with the support surface for the user's hand
Solution Approach 1:
The lever trajectory is positioned in a plane that is offset from and perpendicular to the output shaft's centerline. This spatial arrangement allows the lever to move through its arc-shaped path without intersecting the user's hand support surface, eliminating interference while maintaining effective force transmission through the lever bearing's guided motion.
3Ease of operation
If the lever bearing is positioned to allow free lever movement, then the actuation is easy, but the lever trajectory interferes with the support surface
Solution Approach 1:
The lever bearing provides localized guidance and constraint only where needed - at the pivot point of the lever. This localized constraint allows the lever to move freely along its optimal arc-shaped trajectory while preventing interference with the user's hand support surface. The bearing's positioning is specifically optimized to maintain the lever's motion path clear of the support area.
4Duration of action of moving object
If the drive mechanism allows continuous rotation, then the processing is continuous, but torque control throughout the rotation cycle is suboptimal
Solution Approach 1:
The lever bearing is designed to guide the lever through a dynamically optimized arc-shaped trajectory that varies the effective lever arm length throughout the rotation cycle. This dynamic adjustment ensures that the torque is distributed more evenly and efficiently across all positions of the output shaft rotation, maintaining optimal power transmission during continuous operation.
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
Enables efficient and controlled rotation of processing implements, such as blades, within a food processor, improving the processing efficiency and user experience by optimizing torque distribution and directional control throughout the rotation cycle.
Implementation Method 1
an actuating lever articulated on the housing in a lever bearing in a pivotable manner about a first axis of rotation
Implementation Method 2
a force transfer mechanism driven by the actuating lever to rotate an output shaft extending from the housing into the base about a second axis of rotation that is perpendicular to the first axis of rotation
Data Source
AI summary
A drive assembly for driving an implement is provided. The drive assembly includes a gear drive mechanism comprising a first drive gear rotatable about a first axis of rotation; a second drive gear rotatable about a second axis of rotation and engaged to the first drive gear; a driven member driven by the second drive gear, engaged to the implement, and rotatable about a third axis of rotation; a lobe; and a flexible link engaged to the first drive gear and the lobe, the flexible link comprising a first loop engaged to the lobe and a second loop engaged to the first drive gear. The drive assembly also includes a handle member engaged to the gear drive mechanism and configured to drive the lobe. The implement is rotated about the third axis of rotation as the handle member is moved from an unfired position to a fired position.