Guide Rail Wheel Chock with Ratchet Pawl
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Solution Overview
Problem
Existing wheel chocking systems for loading docks are either expensive to install and maintain or not usable if the ICC bar is bent or displaced, and automatic systems may not effectively secure trailers with hydraulic tailgates or other equipment attached.
Innovation Solution
A manual wheel chock system with a restraint arm pivotally coupled to a carriage on a guide rail, featuring a ratchet mechanism with a spring-loaded pawl that engages the guide rail teeth to prevent trailer movement, allowing for secure locking and easy disengagement using a foot pedal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical restraints engage the ICC bar or rear impact guard to prevent vehicle movement, then vehicle securing reliability is improved, but the system becomes unusable if the ICC bar is bent or displaced
Solution Approach 1:
The patent removes the dependency on the ICC bar or rear impact guard by extracting the engagement point from the vehicle's rear structure. Instead, the restraint arm engages directly with the wheel hub or brake assembly, which are critical components that remain intact even when the ICC bar is damaged. This extraction allows the system to function reliably regardless of ICC bar condition.
Solution Approach 2:
The restraint arm is designed with universal applicability to engage with multiple vehicle types and configurations. It can accommodate vehicles with bent ICC bars, hydraulic tailgates, or other rear equipment by engaging alternative points such as the wheel hub, brake assembly, or axle. This multi-functionality ensures the system works across diverse vehicle conditions.
2Reliability
If below-ground chock systems are installed to secure trailers, then vehicle securing reliability is improved, but installation and maintenance costs increase
Solution Approach 1:
The patent employs above-ground components that are inexpensive to manufacture and replace compared to below-ground systems. The restraint arm, carriage, and guide rail are surface-mounted metal components that can be produced cost-effectively and replaced if damaged, avoiding the high installation and maintenance costs of embedded concrete or steel structures.
Solution Approach 2:
The system is divided into modular segments including the restraint arm, carriage, guide rail, and locking mechanism. Each component can be independently manufactured, installed, and maintained. This segmentation reduces overall system cost compared to monolithic below-ground systems while maintaining reliability through distributed functionality.
3Ease of operation
If automatic wheel chocking systems are positioned on the approach to the loading dock, then ease of operation is improved, but the system may not effectively secure trailers with hydraulic tailgates or other equipment
Solution Approach 1:
The restraint arm is designed with dynamic movement capability, allowing it to be manually positioned along the guide rail to engage with wheels at various locations. This dynamic positioning enables the operator to accommodate trailers with hydraulic tailgates or other equipment by adjusting the engagement point, while the manual operation maintains ease of use.
Solution Approach 2:
The guide rail serves as an intermediary structure that facilitates the restraint arm's movement and positioning. It provides a controlled path for the carriage to travel along, enabling precise placement of the restraint arm at the optimal engagement point on the wheel hub, regardless of trailer configuration.
4Adaptability or versatility
If a manual restraint arm system with ratchet mechanism is used, then adaptability to various trailer configurations is improved, but device complexity increases
Solution Approach 1:
The ratchet mechanism provides self-locking functionality that automatically secures the restraint arm in position once engaged with the wheel hub. The spring-loaded pawl engages with the ratchet teeth to prevent backtracking, creating a self-sustaining locked position that requires no additional actuators or complex control systems, thus limiting complexity growth.
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
The system provides effective and cost-efficient trailer securing at loading docks, allowing for easy operation and adaptability to various trailer configurations, including those with hydraulic tailgates, without the need for expensive installations.
Implementation Method 1
a ratchet mechanism with a spring-loaded pawl that engages the guide rail teeth
Implementation Method 2
a ratchet mechanism with a spring-loaded pawl that engages the guide rail teeth to prevent trailer movement
Data Source
AI summary
Wheel chocks for use with loading docks are disclosed herein. In one embodiment, a manual wheel chock configured in accordance with the present disclosure includes a restraint arm pivotally coupled to a carriage that is rollably mounted to a longitudinal guide rail. The restraint arm is rotatable in a first direction to move a wheel stop in front of a wheel of a vehicle parked adjacent the guide rail. The restraint arm is also rotatable in a second direction opposite to the first direction to move the wheel stop away from the vehicle wheel.