Variable-Height Mounting Arm With Sealed Counterbalance Structure
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Solution Overview
Problem
Existing mechanical arms used in biologically sensitive environments are prone to contamination, have design flaws that make them difficult to clean, and lack adjustability and stability for a wide range of positions, leading to sloppy screen movement and quick joint loosening.
Innovation Solution
The enhanced variable-height mechanical arm features a sealed structure with a four-bar linkage mechanism, a bias element with an adjustable gas spring, and a pivot adjustment mechanism that allows for precise counterbalancing and height adjustment without requiring excessive friction, ensuring cleanliness and stability across a full range of motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional mechanical arm structures with exposed fasteners and pivots are used, then the structure is simpler and easier to manufacture, but the structure is readily contaminated and not highly cleanable
Solution Approach 1:
The patent removes exposed fasteners, pivots, and trim from the mechanical arm structure, extracting only the essential functional elements while eliminating contamination-prone components. The sealed enclosure contains all mechanical interfaces, preventing contaminant accumulation while maintaining structural integrity and adjustability capabilities.
Solution Approach 2:
The patent employs sealed enclosures and covers that act as protective shells, isolating internal mechanical components from the external environment. These sealed structures prevent contaminant ingress while allowing the mechanical arm to maintain its adjustability functions through controlled interfaces.
2Reliability
If friction is increased to retain the monitor at desired positions, then the monitor can be held stable, but the screen movement becomes sloppy and adjustment becomes difficult
Solution Approach 1:
The patent implements dynamic friction control through adjustable damping mechanisms that allow the operator to select between free-motion mode for easy adjustment and damped mode for stable positioning. The system transitions between these states based on operational requirements, providing both ease of adjustment and position stability as needed.
Solution Approach 2:
The patent changes the friction parameter dynamically through adjustable damping controls, allowing the mechanical arm to operate in different modes. By varying the damping level, the system provides low friction for easy adjustment and high friction for stable positioning, resolving the contradiction between adjustability and position retention.
3Adaptability or versatility
If the mechanical arm is designed for frequent adjustment and heavy use, then the adjustability and range of motion improve, but the joints loosen quickly and movement becomes sloppy
Solution Approach 1:
The patent incorporates preliminary tightening features and pre-loaded joint mechanisms that maintain joint integrity through extensive adjustment cycles. The joints are pre-configured with anti-loosening characteristics that prevent degradation from frequent use, ensuring long-term stability while maintaining full adjustability.
Solution Approach 2:
The patent implements feedback mechanisms through tension springs and counterbalancing systems that continuously apply appropriate forces to maintain joint tightness. These feedback elements detect joint position and apply compensating forces that prevent loosening during frequent adjustment operations, ensuring consistent performance over time.
4Device complexity
If a linear screw or bolt mounting is used for the gas spring, then the structure is simpler, but the leverage changes for different weights and loads
Solution Approach 1:
The patent transforms the static linear mounting into a dynamic adjustable mechanism where the gas spring pivot point can be repositioned along an arcuate path. This dynamic adjustment capability allows the system to adapt to different weights and loads by changing the mechanical advantage, providing optimal counterbalancing for various configurations without requiring multiple fixed mounting positions.
Solution Approach 2:
The patent transitions from one-dimensional linear adjustment to two-dimensional arcuate adjustment of the gas spring pivot point. This dimensional change allows the pivot to follow a curved path that optimizes leverage for different arm positions and loads, providing superior adaptability while maintaining a single integrated mounting structure.
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 design significantly reduces contamination risk, enhances cleanability, and provides stable, adjustable support for devices across a wide range of positions, minimizing unwanted movement and maintaining stability under varying loads.
Implementation Method 1
Some prior mechanical arms having adjustable height have used gas springs having a pivot point at one end
Implementation Method 2
the leverage, i.e. the mechanical advantage applied by the gas spring, changes for any of different weights or different loads
Implementation Method 3
The variable-height arm further comprises a bias element, wherein one end of the bias element is adjustably fixable in relation to a defined curve, non-linear path or slot
Data Source
AI summary
Enhanced variable-height mounting arms comprise structures that allow any of improved cleanability and/or improved adjustment of height or counterbalancing. An exemplary enhanced variable-height arm comprises an upper shell structure that substantially extends over the upper and side regions of the mounting arm, forming a four-bar linkage. A lower cover is mounted to the upper cover across the bottom side of the arm, and defines holes therethrough for extension of the opposing ends of the arm. The variable-height arm further comprises a bias element, wherein one end of the bias element is adjustably fixable in relation to a defined curve, non-linear path or slot, such as within a curved slot. The variable-height arm may preferably further comprise a mechanism for adjusting any of the height or counterbalance for the structure.