Universal Crossmember Assembly with Adjustable Clamp Mechanisms
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Solution Overview
Problem
Existing roof rack systems are limited by fixed crossbar lengths and shapes, which do not accommodate varying distances and widths of roof rails across different vehicle makes and models, making it difficult to securely attach cargo of varying lengths.
Innovation Solution
A universal crossmember assembly with adjustable clamp mechanisms and modular pads that can grip rails of various widths and distances, allowing the crossbar to be securely attached to roof rails with a range of spacings and widths, featuring actuators, biasing mechanisms, and interchangeable pads for adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed length crossbar is used, then the crossbar can be securely attached to rails of specific spacing, but it cannot accommodate varying distances between rails of different vehicles
Solution Approach 1:
The crossbar incorporates an adjustable mechanism that allows its effective length to be dynamically changed. The second jaw is displaceable along the longitudinal axis of the crossbar, enabling the distance between the first and second jaws to be adjusted. This dynamic adjustment capability allows the same crossbar to accommodate various rail spacings across different vehicle types without requiring multiple fixed-length crossbars.
Solution Approach 2:
The crossbar is designed with universal adaptability through its adjustable mechanism and interchangeable modular pads. By combining the adjustable jaw displacement with multiple pad thickness options, a single crossbar design can serve multiple vehicle types with different rail configurations, replacing the need for vehicle-specific custom crossbars.
2Adaptability or versatility
If the crossbar length is increased to accommodate larger rail spacing, then it can fit more vehicle types, but it becomes too long for vehicles with smaller rail spacing
Solution Approach 1:
Rather than using a single long crossbar that would fit all vehicles, the invention uses a dynamic adjustment mechanism where the second jaw can be displaced along the longitudinal axis. This allows the effective gripping span to be adjusted to match the specific rail spacing of each vehicle, eliminating the need for an excessively long crossbar while maintaining universal compatibility.
3Adaptability or versatility
If fixed shape clamps are used, then the clamp structure is simple, but it cannot grip rails of various widths
Solution Approach 1:
The clamp mechanism is segmented into modular components: a first jaw, a displaceable second jaw, and interchangeable modular pads. Each pad has a specific thickness designed to accommodate different rail widths. By segmenting the gripping surface into replaceable pads, the system can adapt to various rail widths without redesigning the entire clamp structure.
Solution Approach 2:
The clamp mechanism accommodates different rail widths by changing the parameter of pad thickness. Multiple pads with different thicknesses are provided, and the appropriate pad is selected and attached to the jaw based on the specific rail width being gripped. This parameter change approach allows a single clamp mechanism design to handle multiple rail width variations.
4Reliability
If multiple custom crossbars are manufactured for different vehicles, then each fits its specific vehicle perfectly, but manufacturing cost and inventory complexity increase
Solution Approach 1:
The invention creates a universal crossbar design that can be manufactured in a single standard configuration but adapted to multiple vehicle types through its adjustment mechanism and interchangeable pads. This eliminates the need to manufacture and inventory multiple custom crossbar variants for different vehicles, reducing manufacturing complexity and inventory requirements while maintaining reliable attachment across all vehicle types.
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 secure attachment of crossbars to roof rails with varying spacings and widths, enhancing cargo carrying capacity and compatibility across different vehicle types, ensuring stable support for cargo of diverse lengths.
Implementation Method 1
a biasing mechanism coupled to one or more of the jaws. The biasing mechanism is capable of urging the first jaw away from the second jaw
Implementation Method 2
an actuator engaged with one or more of the jaws. The actuator is movable between a non-actuated position and an actuated position
Data Source
AI summary
A universal crossmember assembly is provided for a motor vehicle having a roof and first and second rails attached to the roof. The assembly includes a crossbar having first and second ends along an axis. The assembly further includes a first clamp mechanism engaged with the first end for securing the crossbar to the first rail. The assembly further includes a second clamp mechanism engaged with the second end for securing the crossbar to the second rail. Each clamp mechanism includes at least first and second jaws having an associated one of first and second rail gripping surfaces for gripping one of the rails when an actuator is moved to an actuated position. Each clamp mechanism further includes a biasing mechanism capable of urging the first jaw away from the second jaw when the actuator is moved to a non-actuated position.