Adjustable Arm Support with Passive Actuator
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Solution Overview
Problem
Existing arm support devices pose safety risks due to uncontrolled actuator ends and require complex constructions that limit natural shoulder movements, and they lack adjustable force settings for different users and activities.
Innovation Solution
A device with a passive actuator that stores energy through mechanical means, allowing force adjustment without loosening the actuator ends, by modifying the deflection element's shape or position, and using a combination of elastic and inelastic transmission elements to change the force and direction of the applied force without altering the actuator's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the actuator ends are made adjustable to accommodate different users and activities, then the adaptability is improved, but the risk of uncontrolled actuator ends increases
Solution Approach 1:
The patent introduces a deflection element as an intermediary component between the actuator and the arm support element. This deflection element serves as a mediator that allows force adjustment through its geometric configuration while maintaining secure connection points, thereby enabling adaptability without exposing users to uncontrolled actuator ends. The deflection element acts as a safe interface that translates actuator motion into controlled force application.
Solution Approach 2:
The patent employs parameter changes by modifying the geometric parameters of the deflection element (such as its shape, orientation, and position) to adjust the force characteristics of the actuator. By changing these geometric parameters rather than physically adjusting the actuator ends, the system achieves force adaptability while maintaining structural integrity and safety. The deflection element's geometry can be configured to provide different force magnitudes and directions for various users and activities.
2Adaptability or versatility
If multiple joints and connecting frame elements are used to replicate shoulder joint movements, then the adaptability to natural movements is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the deflection element to serve multiple functions: it acts as a force transmission component, a geometric constraint element, and an adjustable parameter mechanism all in one. This multi-functional design reduces the need for separate components for each function, thereby simplifying the overall device structure while maintaining the ability to replicate natural shoulder movements. The deflection element's geometric configuration can accommodate various movement patterns without requiring additional specialized joints.
Solution Approach 2:
The patent merges the functions of force transmission, movement constraint, and adjustment mechanism into a single integrated deflection element. Instead of using separate components for each function, the design combines them into one unified element that achieves multiple objectives simultaneously. This merging reduces the total number of elements in the system while preserving the capability to replicate complex shoulder joint movements through its geometric configuration.
3Reliability
If the actuator is rigidly fixed to maintain stable force application, then the reliability is improved, but the ease of adjustment decreases
Solution Approach 1:
The patent applies dynamics by creating a system that transitions from a static rigid fixation to a dynamic adjustable configuration. The deflection element's geometric parameters can be modified to change the force characteristics, allowing the system to adapt to different operational requirements. This dynamic capability enables force adjustment while maintaining stability during operation, as the deflection element's configuration can be optimized for each specific task while providing consistent force application throughout the movement range.
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 safe and adjustable force application without the risk of uncontrolled actuator ends, enhances user comfort by mimicking natural shoulder movements, and allows for versatile use across different activities and users.
Implementation Method 1
a passive actuator (14) which has a first end (11) and a second end (10) and is set up to apply a force to the at least one arm support element (2)
Data Source
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AI summary
The invention relates to a device for supporting at least one upper arm of a user, wherein the device comprises a. at least one arm support element (2) with an arm shell (32) for placement against the upper arm, b. at least one passive actuator (14) having a first end and a second end (10) and configured to apply a force to the at least one arm support element (2), and c. at least one counter bearing for the force to be applied, wherein the device comprises at least one deflection element (28) against which the at least one actuator (14) rests and whose type, shape, position and/or orientation relative to the arm support element (2) is variable such that the force that can be applied by the actuator (14) is adjustable.