Orthosis Joint With Bending Spring for Smooth Restoring Forces
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Solution Overview
Problem
Existing orthosis joints exhibit abrupt changes in restoring forces during alternating deflections, leading to jerky movements and noise, and are not aesthetically pleasing due to projecting functional elements.
Innovation Solution
A compact orthosis joint design utilizing a single bending spring, arranged in a stacking configuration with lateral actuation points, generates smooth restoring forces through a continuous frictional connection, allowing for adjustable stiffness and force transmission via triangular arrangements of transmission elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple functional elements are used to generate restoring forces in opposite directions, then the restoring force coverage is improved, but the transition between functional elements causes abrupt force changes and jerky movements
Solution Approach 1:
The patent combines multiple functional elements into a single integrated element that can generate restoring forces in both directions. This single element features a continuous frictional connection that eliminates abrupt transitions between opposing force directions, providing smooth jerk-free movement while maintaining comprehensive restoring force coverage.
Solution Approach 2:
The patent implements a continuous frictional connection between the functional element and joint arms that ensures uninterrupted force transmission during alternating deflections. This continuous action prevents the abrupt transitions and noise associated with discrete functional element switching, maintaining smooth operation throughout the entire range of motion.
2Force
If functional elements are designed to provide restoring forces in both directions, then the force generation capability is improved, but the frictional connection causes wear and noise
Solution Approach 1:
The patent optimizes the frictional connection parameters to achieve an optimal balance between force transmission and wear reduction. By carefully controlling the friction coefficient and contact pressure, the system generates sufficient restoring forces while minimizing wear and noise during operation.
3Volume of moving object
If a compact design is implemented, then the aesthetic appearance is improved, but the adjustment range of functional angles may be limited
Solution Approach 1:
The patent employs a nested arrangement where the functional element is positioned within the joint structure, allowing for compact packaging while maintaining full adjustment capability. The transmitting element can be adjusted along the longitudinal axis of the functional element, providing a wide range of functional angles within a compact form factor.
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 design provides a natural, jerk-free movement with adjustable restoring forces, reducing wear and noise, while maintaining a compact and aesthetically appealing form.
Implementation Method 1
a single functional element, in particular a bending spring, which extends essentially in the longitudinal direction
Implementation Method 2
a continuous frictional connection between the joint arms on the orthosis joint and the functional element
Data Source
AI summary
The invention relates to an orthosis joint (5), in particular for forming a functional angle (14) for a deflection on both sides, comprising: a first joint arm (1) and a second joint arm (2) that are mounted on a shaft (7) such that they can be pivoted relative to each other; and at least one functional element (29) that functions as a retractive element between the two joint arms (1,2) and comprises at least one spring (16,17) subjected to bending which produces a retractive force (27) on both sides when the joint arms (1, 2) are deflected.