Five-Arm Motion Conversion Mechanism for Compact Linear Output
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Solution Overview
Problem
Existing mechanisms for converting rotational motion into straight line motion are not compact enough, occupying excessive space and lacking versatility in applications.
Innovation Solution
A mechanism comprising five levers or arms with pivoted connections, where rotation of the first arm about a fixed pivot causes the second arm to rotate and the third arm to move in a straight line, with the third arm's point tracing a path that is a close approximation to a straight line, allowing for both linear and rotational motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional straight line mechanisms (Watt linkage, Peaucellier-Lipkin inversor) are used to convert rotational motion into straight line motion, then the motion conversion function is achieved, but the mechanism occupies excessive space and is not compact
Solution Approach 1:
The patent applies nesting by arranging the five levers in a compact configuration where levers are positioned within the space envelope of others when retracted. The first and second levers share a common fixed pivot, and the third, fourth, and fifth levers are arranged to fold within the space occupied by the first two levers, creating a nested spatial arrangement that minimizes the overall volume occupied by the mechanism.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by allowing levers to move in multiple dimensions - the third lever moves in a straight line perpendicular to the plane of the first two levers, while the fourth and fifth levers provide rotational movement in different planes. This multi-dimensional arrangement enables compact folding when retracted while maintaining full motion capability when deployed.
2Device complexity
If multi-lever mechanisms are used to provide straight line motion, then motion conversion is achieved, but the assembly is complex and occupies excessive space
Solution Approach 1:
The patent merges multiple functions into a unified five-lever system where the first two levers provide the primary motion conversion, the third lever extends the straight line motion, and the fourth and fifth levers provide rotational capability. This consolidation of multiple motion functions into a single integrated mechanism reduces overall complexity compared to using separate mechanisms for each function.
Solution Approach 2:
The mechanism achieves multi-functionality by enabling the third lever to move in a straight line while simultaneously allowing the fourth and fifth levers to rotate the assembly. This universal design allows the same mechanism to perform both linear and rotational motion conversion, eliminating the need for separate mechanisms and reducing overall system complexity.
3Adaptability or versatility
If traditional mechanisms allow components to move away from central plane, then versatility is improved, but internal space is encroached upon
Solution Approach 1:
The patent applies dynamics by designing the mechanism to be collapsible and expandable. When retracted, all levers fold into a compact nested arrangement that minimizes space occupation. When deployed, the levers extend outward to provide full motion capability. This dynamic transformation allows the mechanism to adapt its spatial footprint based on operational requirements, maintaining versatility while preserving internal space when not in use.
Data Source
AI summary
An assembly for converting motion is provided, the assembly comprising: a first arm rotatable about a first fixed pivot; a second arm rotatable about a second fixed pivot, the second fixed pivot spaced apart from the first fixed pivot; a third arm pivotably connected to the second arm; a fourth arm pivotably connected to the second arm; a first connecting arm pivotably connected to and extending between the first arm and the third arm; a second connecting arm pivotably connected to and extending between the first arm and the second arm; and a third connecting arm pivotably connected to and extending between the first arm and the fourth arm. The assembly finds particular use in the support and movement of moveable building assemblies.