3D Log Spiral Lever Mechanism for Repeating Torque Strokes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional levers are inefficient and cause discomfort and fatigue due to their fixed two-dimensional operation, which does not provide sufficient torque for tasks, especially when used over extended periods, and are often counter to gravity, resulting in high energetic costs.
Innovation Solution
A three-dimensional log spiral mechanism that applies rotational force at two points along a rod, mimicking human anatomy, allowing for alternating downward rotational force to optimize leverage across three dimensions, reducing the impact of gravity and improving ergonomics and torque efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional fixed two-dimensional levers are used, then the device structure is simple, but the torque output is insufficient and user fatigue increases
Solution Approach 1:
The patent transitions from conventional two-dimensional lever operation to three-dimensional operation by introducing a log spiral mechanism that rotates around the rod axis. This adds a rotational dimension to the traditional linear or planar lever movement, enabling the effort arm to access multiple positions in three-dimensional space and generate greater torque through extended lever arm length
2Ease of operation
If conventional levers operate in fixed two-dimensional planes, then the mechanism is simple, but ergonomics deteriorate and user discomfort increases
Solution Approach 1:
By adding the third dimension of rotation around the rod axis, the lever can be positioned at various angles and orientations, allowing the user to apply force in more natural anatomical directions. This three-dimensional freedom of movement improves ergonomics by accommodating different user positions and reducing strain on wrists and arms
Solution Approach 2:
The log spiral mechanism provides dynamic, continuous adjustment of the effort arm position and orientation, allowing the lever to move freely in three-dimensional space rather than being constrained to fixed positions. This dynamic adaptability enables the system to optimize ergonomics throughout the range of motion
3Use of energy by moving object
If conventional levers reset against gravity, then the mechanism is simple, but energy consumption increases
Solution Approach 1:
The log spiral mechanism allows the lever to return to its starting position by rotating back along the spiral path, utilizing the same rotational degree of freedom for both the working stroke and the reset. This eliminates the need to lift the lever against gravity in a different direction, reducing energy loss during the reset phase
4Productivity
If conventional levers provide limited torque, then the device is simple, but productivity decreases for demanding tasks
Solution Approach 1:
The three-dimensional log spiral mechanism extends the effective lever arm length by utilizing rotation around the rod axis, creating a longer moment arm for force application. This geometric advantage multiplies the torque output for the same applied force, enabling the system to perform demanding tasks more efficiently
Data Source
AI summary
A system and method for a lever that is formed by a rod gripped with a three dimensional log spiral structure that applies alternating downward rotational force at two points along the rod, producing rhythmic applications of leverage around its fulcrum. As one end of the spiral rotates down with application of force, the other is rotated up via segmental action of the components of the log spiral component and positioned for a subsequent downstroke.