Extendable Vehicle Rack Pivot Joint Neutralizes Intrinsic Forces
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Solution Overview
Problem
Existing extendable vehicle roof rack systems face issues with intrinsic forces caused by clamp rack load carrier feet, leading to bending of the roof rack system and potential sticking of the extendable part, which can result in damage to the vehicle and stress on the rack components.
Innovation Solution
An extendable vehicle rack arrangement with a displaceable load carrying bar and pivotally attached load carrier feet, featuring a compensation joint to reduce intrinsic forces and allow relative displacement, thereby preventing rotation and stress on the rack system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clamp rack load carrier feet are used to attach the roof rack system to the vehicle, then secure attachment is achieved, but intrinsic forces cause the stationary part to bend and the extendable part to stick
Solution Approach 1:
The patent introduces a pivotal connection between the stationary part and the load carrier feet, allowing the stationary part to rotate relative to the feet. This dynamic connection enables the system to accommodate the rotational force generated by clamp rack feet, preventing the stationary part from bending and maintaining its straightness while still achieving secure attachment.
2Stability of the object's composition
If the stationary part is rigidly connected to load carrier feet, then structural stability is maintained, but the extendable part experiences increased friction and sticking
Solution Approach 1:
The pivotal connection transforms the rigid connection into a dynamic one, allowing the stationary part to rotate and absorb intrinsic forces. This prevents force transmission to the extendable part, reducing friction and sticking while maintaining structural stability through the controlled rotational movement.
3Force
If clamp rack load carrier feet are used, then strong clamping force is achieved, but rotational force causes bending of the stationary part
Solution Approach 1:
The pivotal connection allows the stationary part to rotate in response to the rotational force generated by the clamp rack feet. This dynamic adjustment enables the system to maintain strong clamping force while accommodating the rotational moment, preventing bending stress and maintaining the stationary part's straightness.
Data Source
AI summary
The present invention relates to an extendable vehicle rack arrangement (10) comprising a first and a second load carrier foot (3, 4) and comprising a stationary part (12) attached to said first and second load carrier foot (3, 4) and a displaceable part (11). The stationary part (12) is pivotally connected to at least one of the load carrier feet (3, 4). The extendable vehicle rack arrangement (10) is advantageously an extendable vehicle top rack arrangement. The present invention provides for a solution which effectively reduces or neutralizes the intrinsic forces which can be imparted to an extendable vehicle rack arrangement during or after attachment to a vehicle, thereby providing an easier extension of the displaceable part (11).