Motion Conversion Linkage With Deployable Support Arm
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Solution Overview
Problem
There is a need for an improved assembly that can convert rotational motion into straight line motion while allowing a supporting member to be deployed from a retracted to an extended position, offering compactness and efficient support during movement.
Innovation Solution
The assembly comprises a first and second arm rotatable about fixed pivots, a third arm linked to these arms, and a connecting arm, allowing rotation of the first and second arms to move the third arm between retracted and extended positions, with the third arm serving as a support when extended.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional straight line mechanism is used, then rotational motion can be converted to straight line motion, but the mechanism occupies significant space and cannot provide support during movement
Solution Approach 1:
The third arm serves dual functions: it acts as a linkage component in the motion conversion mechanism and simultaneously provides support when extended. This multi-functionality resolves the contradiction by integrating the support capability into the existing mechanism structure without adding separate support components that would increase space occupation.
Solution Approach 2:
The third arm transitions between retracted and extended positions dynamically during the operation cycle. When the platform moves from first to second position, the third arm extends to provide support; when returning to the first position, it retracts. This dynamic behavior allows the mechanism to provide support only when needed, maintaining compactness while offering support capability.
2Adaptability or versatility
If the third arm is extended to provide support, then support capability is improved, but the mechanism cannot be compact
Solution Approach 1:
The third arm's length is dynamically adjusted through extension and retraction based on operational requirements. During the forward movement phase, the arm extends to provide support; during the return phase, it retracts to minimize occupied space. This dynamic length adjustment resolves the contradiction between needing support capability and maintaining compactness.
Solution Approach 2:
The third arm can be positioned within or alongside other mechanism components when retracted, creating a nested configuration that minimizes the overall envelope of the mechanism. This nesting approach allows the arm to achieve full extension length for support when needed while occupying minimal space during retraction.
3Adaptability or versatility
If the assembly moves from retracted to extended position, then support is provided, but time is required for the movement transition
Solution Approach 1:
The third arm is positioned and prepared for extension in advance during the approach phase of the platform movement. As the platform approaches the second position, the third arm begins extending in preparation, so that support is immediately available when the platform arrives, minimizing the transition time and ensuring continuous support capability.
Solution Approach 2:
The extension and retraction of the third arm are integrated into the continuous operational cycle of the platform movement. Rather than being a separate, discrete action, the arm's length adjustment occurs continuously throughout the operation, synchronized with the platform's motion phases. This eliminates idle transition time and maintains continuous useful action.
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
This assembly enables compact storage and automatic support as it moves from a retracted to an extended position, effectively converting rotational motion into straight line motion with the third arm providing support for components or structures.
Implementation Method 1
a first arm rotatable at a first position on the first arm about a first fixed pivot; a second arm rotatable at a first position on the second arm about a second fixed pivot
Data Source
AI summary
An assembly for converting motion comprises a first arm rotatable at a first position about a first fixed pivot; a second arm rotatable at a first position about a second fixed pivot; a third arm linked at a first position to the second arm at a second position on the second arm, the third arm being linked at a second position to the first arm at a second position on the first arm; wherein one of the first and second positions on the third arm is moveable and the other of the first and second positions is fixed relative to the third arm; and a connecting arm extending between the first arm and the second arm, the connecting arm pivotably connected at a first position to a third position on the first arm and pivotably connected at a second position to the second position on the second arm.