Articulated Roller Assembly for Bent Roof Rack Bars
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Solution Overview
Problem
Existing roof rack systems require multiple people to lift and load watercraft due to rigid rotating elements that cannot fit around the bends in V-shaped or U-shaped bars, increasing manufacturing costs and time.
Innovation Solution
An articulated roller assembly with cylindrical bushings surrounded by a flexible sleeve, designed to fit over the bent portions of roof rack bars, allowing the rollers to spin freely and accommodate various bend radii.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rigid rotating elements are used in roof rack mounting systems, then rotation around mounting bars is facilitated, but the elements cannot fit around the bends in V-shaped or U-shaped bars
Solution Approach 1:
The roller is divided into multiple rigid bushings (typically 3-5) connected by flexible material. Each bushing maintains rigidity for rotation while the flexible connections allow the assembly to conform to bent bar shapes. This segmentation enables both rotation capability and adaptability to curved surfaces.
Solution Approach 2:
The roller assembly changes its physical parameters by allowing the flexible material to deform and the bushings to adjust their relative positions. This enables the rigid components to accommodate curved geometries while maintaining their rotational function around bent bars.
2Ease of operation
If rigid rotating elements are used to facilitate watercraft loading, then rotation is enabled, but multiple people are still required to lift and load watercraft
Solution Approach 1:
The mounting system transitions from static rigid rollers to dynamic articulated rollers that can adapt their shape. This allows the rollers to conform to the bent bar geometry and provide smooth rotation, enabling single-person operation while reducing loading time through improved mechanical efficiency.
3Ease of operation
If rigid rotating elements are used, then rotation function is provided, but manufacturing complexity and expense increase
Solution Approach 1:
The roller assembly combines rigid bushings (typically metal or hard plastic) with flexible material (such as rubber or polymer). This composite structure provides the rotation function of rigid elements while the flexible material allows adaptation to bent bars, simplifying manufacturing compared to creating entirely rigid custom-shaped rollers.
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
Enables efficient loading and unloading of watercraft by allowing single-person operation, reducing manufacturing complexity and costs by accommodating bends in roof rack bars.
Implementation Method 1
The articulated rollers comprise a series of cylindrical rigid bushings surrounded by a flexible, deformable sleeve
Implementation Method 2
The bushings have an inner diameter and length such that the articulated roller can be fitted over the bent portion of the bar
Data Source
AI summary
An articulated roller assembly for a bent bar comprising an articulated roller configured to spin relative to the bent bar. The bent bar generally comprises at least one bent portion and at least one straight portion. The articulated roller is designed to be fitted over the bent portion of the bar to be positioned on the at least one straight portion of the bar where it spins freely. The articulated rollers comprise a series of cylindrical rigid bushings surrounded by a flexible, deformable sleeve. The bushings have an inner diameter and length such that the articulated roller can be fitted over the bent portion of the bar. In some examples, the inner diameter and length of the bushings are a function of the outer diameter of the bent bar and the radius of the bend in the bent portion of the bar.