Parallelogram Linkage Mechanism for Straight-Line Positioning
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Solution Overview
Problem
Current machines and mechanisms for moving and positioning objects in straight lines and parallel planes are complex, costly, and prone to stability issues, particularly when dealing with irregular objects of varying sizes, as seen in industrial robot arms and scissor lifts, which require intricate calculations and heavy, expensive slides that need constant lubrication.
Innovation Solution
A parallelogram four bar linkage mechanism with additional coplanar pivotable links and crossed flexible pulling and holding means, allowing for synchronized movement and enhanced stability, enabling efficient straight line and parallel plane motion with reduced complexity and energy requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If slides and linear bearings are used to create straight paths, then positioning accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The mechanism divides the motion control into multiple segments: the scissor mechanism handles vertical displacement while the parallelogram linkage handles horizontal positioning. This segmentation allows each subsystem to perform a specific function with simpler components, avoiding the need for complex slides and linear bearings to control both motions simultaneously.
Solution Approach 2:
The invention merges the vertical lifting function (scissor mechanism) with the horizontal positioning function (parallelogram linkage) into a single integrated system. This combination achieves accurate positioning without requiring separate complex guidance systems, as the coupling between the two mechanisms provides inherent motion control.
2Stability of the object's composition
If crossheads with slides are used in large engines, then straight path stability is improved, but weight and maintenance requirements increase
Solution Approach 1:
The invention replaces the traditional crosshead-slide mechanical system with a linkage-based system. The parallelogram four-bar linkage inherently maintains parallelism and stability through its geometric constraints, eliminating the need for heavy slides and their associated lubrication systems, thereby reducing weight and maintenance while preserving straight path stability.
3Ease of operation
If scissor mechanisms are used for platform lifts, then parallel plane movement is achieved, but strength and stability deteriorate as height increases
Solution Approach 1:
The invention merges the scissor mechanism (for vertical motion) with the parallelogram four-bar linkage (for horizontal stabilization). The parallelogram structure provides rigid geometric constraints that prevent lateral instability and maintain strength even at elevated positions, while the scissor mechanism continues to provide the parallel plane movement capability.
4Manufacturing precision
If complex computer calculations and positioners are used in robot arms, then positioning precision is improved, but device complexity and energy consumption increase
Solution Approach 1:
The mechanism uses passive geometric constraints through the parallelogram linkage to automatically maintain parallelism and positioning accuracy without requiring active computer control or complex positioners. The structure itself enforces the correct motion path through its geometry, allowing simple actuators to achieve precise positioning with minimal computational overhead.
Data Source
AI summary
The present invention provides for a mechanism that allows for the creation of devices and machines that function to move, position and hold relative to straight lines and parallel planes. The functions are enabled without the use of sliding surfaces or linear bearings, and, in the case of robotics, without the use of complex calculations and control systems. The mechanism of the present invention incorporates a four bar planar parallelogram linkage with the ground link fitted with at least one additional coplanar pivotable link. The additional link and one of the four bar linkage's rocker links are fitted with circular means. Crossed flexible pulling and holding means are applied in a way so that, when the additional pivotable link is moved in a direction, the connected rocker link moves in the opposite direction, and, when the additional planar pivotable link is held in a certain position, the connected rocker link is held in the same relative position. The further rocker link and the coupler of the planar four bar linkage either move or are held accordingly. The described mechanism is added to and mounted in various ways to enable the described functions.