Single Handle Trailer Hitch Control Linkage
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Solution Overview
Problem
Existing fifth-wheel and gooseneck trailer hitches are difficult for older operators to use due to accessibility and strength requirements, and they lack robustness and reliability while being exposed to weather, with complex operation and high manufacturing costs.
Innovation Solution
A hitch design featuring a single handle with a short release throw, a control rod that translates within a sleeve, a latch for secure positioning, and a follower for visual position indication, with kingpin recesses and a bearing structure that is stiffer in roll than in pitch, allowing easy operation and secure engagement without excessive force or weather degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional control mechanisms are used, then the hitch is strong and secure, but it requires excessive force and complex operation that is difficult for older operators
Solution Approach 1:
The control rod is designed to translate dynamically within the sleeve, converting a small handle movement into a larger jaw opening motion. This dynamic mechanical advantage system allows operators to open the hitch with minimal force while maintaining strong engagement when closed
Solution Approach 2:
The control rod acts as an intermediary between the handle and the jaws, transmitting and amplifying the operator's input force. The sleeve serves as an intermediary guide that ensures smooth translation of the control rod, reducing friction and required operating force
2Reliability
If the hitch is designed for strong engagement, then it is reliable, but it becomes complex and expensive to manufacture
Solution Approach 1:
The hitch is segmented into distinct functional components: jaws for engagement, a control rod for operation, a sleeve for guidance, and a latch for security. This segmentation allows each part to be simple and inexpensive to manufacture while collectively providing reliable and secure engagement
Solution Approach 2:
The latch mechanism automatically engages when the control rod is in the closed position, providing self-service security without requiring additional complex components or manual intervention. The mechanical design ensures the latch secures the control rod automatically, maintaining reliability while minimizing complexity
3Ease of operation
If the control mechanism is made accessible, then it is easy to operate, but it may compromise the structural integrity or security of the hitch
Solution Approach 1:
The control rod is nested within the sleeve, which is integrated into the jaw structure. This nested arrangement allows the control mechanism to be accessible from the outside while the jaws remain securely engaged with the trailer kingpin, maintaining both accessibility and security simultaneously
Data Source
AI summary
A hitch includes a control linkage having a single handle on a control bar. The control linkage doubles to provide both a positive safety feature and a movement feature to the hitch, permitting single handed operation of both the positive safety feature and the opening of the hitch with the single handle. A release throw of four inches or less opens jaws of the hitch. A latch is included which can secure the control bar in either a secured position or in a release position. A follower is secured to one of the jaws to maintain timing between the jaws, and the follower doubles as a hitch position indicator so an operator to easily visually discern the position of the hitch. By including kingpin recesses of appropriate location and depth on the jaws, the hitch can be used with or without a lube plate over the skid plate.