Locking Linkage Assembly for Compact Straight-Line Motion
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Solution Overview
Problem
Existing mechanisms for converting rotational motion into straight line motion are not compact enough, lacking the necessary rigidity and stability to efficiently support heavy loads and occupy excessive space, limiting their versatility and range of applications.
Innovation Solution
A motion conversion assembly comprising a first and second arm rotatable about fixed pivots, a third arm pivotably connected to the second arm, and connecting arms, with a locking assembly that increases the assembly's strength and stability by locking arms in specific positions, allowing for a compact and efficient straight line motion conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If existing straight line mechanisms are used, then rotational motion can be converted to straight line motion, but the mechanisms occupy excessive space and lack compactness
Solution Approach 1:
The mechanism employs nested arms where the third arm is positioned within the arc swept by the first arm, and the second arm is positioned within the arc swept by the first arm. This nesting arrangement allows multiple arms to occupy overlapping spatial zones, significantly reducing the overall volume and footprint of the mechanism while maintaining its motion conversion functionality.
2Strength
If existing straight line mechanisms are used, then motion conversion is achieved, but the mechanisms lack sufficient rigidity and stability to support heavy loads
Solution Approach 1:
The mechanism is divided into multiple segmented arms (first arm, second arm, third arm) that are pivotally connected. Each arm can be independently optimized for strength and stiffness, allowing the structure to support heavy loads while maintaining manageable complexity through modular design. The segmented structure enables better load distribution across multiple connection points.
Solution Approach 2:
The mechanism transitions from planar motion to three-dimensional spatial arrangement by positioning arms in different angular orientations around fixed pivots. The arms sweep arcs in different planes and orientations, creating a three-dimensional configuration that enhances structural rigidity and load-bearing capacity while maintaining compact footprint.
3Stability of the object's composition
If existing straight line mechanisms are used, then motion conversion is achieved, but the mechanisms lack the necessary stability for efficient operation
Solution Approach 1:
The mechanism incorporates a locking assembly that preemptively locks the arms in predetermined positions during operation. This preliminary action of locking stabilizes the mechanism before heavy loads are applied or during critical phases of motion conversion, preventing instability and ensuring efficient operation. The locking occurs in advance of potential instability conditions.
Data Source
AI summary
An assembly for converting motion comprises a first arm and a second arm rotatable about first and second fixed pivots; a third 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 locking assembly comprising a first locking member and a second locking member, the first locking member connected to one of the arms and engaging with the second locking member at one or more positions from the retracted position to the extended position. The assembly may comprise the guide assembly comprising a guide member and an engagement member moveably engageable with the guide member.