Ladder Rack Angular Body S-Bar Mounting
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Solution Overview
Problem
Existing ladder racks for vehicle roofs are often complex, require multiple steps for deployment and securement, and are not compatible with most personal vehicles, leading to inefficiencies and increased costs.
Innovation Solution
A rugged ladder rack with an angular body and internal S-bar, featuring a hook on one leg for secure one-step mounting and stowage, eliminating the need for additional straps or tie-downs and mechanical moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ladder racks are used, then ladder security is improved, but device complexity increases and requires multiple tie-downs and straps
Solution Approach 1:
The patent combines multiple security functions (transverse restraint, longitudinal restraint, and ladder positioning) into a single integrated rack structure. The crossbar integrates transverse blocking features, while the end structures combine longitudinal restraint and positioning elements, eliminating the need for separate tie-downs and straps.
Solution Approach 2:
The rack structure performs multiple functions simultaneously: the crossbar provides transverse support and blocking, the end structures provide longitudinal restraint and positioning, and the integrated design accommodates various ladder types. This multi-functionality eliminates the need for additional specialized securement devices.
2Reliability
If traditional ladder racks with multiple moving parts are used, then ladder securement is improved, but ease of operation deteriorates due to multiple stowage and deployment steps
Solution Approach 1:
The patent removes all mechanical moving parts (levers, joints, swing arms) from the rack structure, extracting the complexity that caused multiple operation steps. The static structure relies on geometric constraints and friction rather than mechanical actuation, enabling simple one-step ladder placement.
Solution Approach 2:
The rack structure uses self-latching features where the ladder's own weight and geometry automatically engage the restraint mechanisms. The transverse blocking features and longitudinal restraint elements are passively activated by ladder placement, eliminating the need for manual operation of moving parts.
3Reliability
If additional straps and tie-downs are used, then ladder security is improved, but time consumption increases due to multiple attachment steps
Solution Approach 1:
The patent merges the functions of multiple separate securement devices (straps, tie-downs, clamps) into a single integrated rack structure. The crossbar and end structures work together to provide comprehensive ladder restraint, eliminating the need for multiple sequential attachment operations.
Solution Approach 2:
The rack structure is pre-configured with transverse blocking features and longitudinal restraint elements in fixed positions. These features are already in place before ladder arrival, allowing immediate securement upon ladder placement without requiring sequential attachment of multiple components.
4Reliability
If complex rack designs are used, then ladder securement capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent divides the rack into simple, manufacturable segments: a crossbar with integrated transverse blocking features, and two end structures with longitudinal restraint elements. These segments can be manufactured separately using standard fabrication processes and then assembled, reducing overall manufacturing complexity.
Solution Approach 2:
The rack structure applies complexity only where needed for securement function, while other areas remain simple. The transverse blocking features and longitudinal restraint elements are localized to specific regions, allowing simple bulk manufacturing with minimal post-processing.
Data Source
AI summary
A ladder rack with improved utility may feature a rugged single body construction with multiple bends forming a pocket between two arms. The ladder rack is mountable upon a surface, such as a vehicle roof, and contains a portion of a ladder within it. The ladder is secured transversely within the pocket as the opening is smaller than the width of a ladder rail and the use of two ladder racks, since one arm projects around a ladder rail, will secure against translational movement along the car's length if positioned to abut ladder rungs. An optional S-bend can be utilized to further control of the ladder in stowage and in securing against movement in transit.