Drawbar Pin Adapter for Tractor Implement Compatibility
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Solution Overview
Problem
The challenge is to connect implements with small diameter drawbar pins to tractors equipped with larger diameter drawbar pin holes, as existing solutions do not provide a versatile adapter for accommodating different pin sizes.
Innovation Solution
A drawbar pin adapter comprising a cylindrical bushing and a hollow housing with retainer mechanism, allowing a Category 4 drawbar pin to be used with a Category 5 tractor and easily removable for use with a Category 5 pin, featuring a bushing that fits within the drawbar pin bore and a housing that secures over the strap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a small diameter drawbar pin is used to match the implement, then the implement can be connected, but it will not fit securely in the larger diameter drawbar pin hole
Solution Approach 1:
The patent introduces an adapter as an intermediary component between the implement's small drawbar pin and the tractor's large drawbar pin hole. The adapter includes a bushing with a small bore that receives the small diameter pin, and an outer housing with a large bore that fits into the tractor's drawbar hole, thereby mediating the size mismatch and enabling secure connection.
Solution Approach 2:
The adapter employs a nested structure where the bushing is inserted inside the housing. The bushing contains the small diameter pin, while the housing contains the bushing and fits into the larger drawbar hole. This nested arrangement allows the smaller pin to be securely held within the larger hole through multiple concentric layers.
2Adaptability or versatility
If an adapter is installed to accommodate smaller pins, then compatibility is improved, but the adapter adds complexity to the drawbar system
Solution Approach 1:
The adapter is designed with a universal structure that can accommodate multiple pin sizes. The housing contains a bushing that can be replaced or adjusted to fit different pin diameters, allowing the same adapter housing to serve multiple functions for different implements requiring different pin sizes.
Solution Approach 2:
The adapter is segmented into distinct components: the housing, the bushing, and the retention mechanism. This segmentation allows for easy assembly and disassembly, and enables the bushing to be replaced if needed for different pin sizes, reducing overall system complexity while maintaining versatility.
3Reliability
If the adapter uses a retention mechanism to secure the housing, then reliability is improved, but the retention mechanism adds complexity to the adapter structure
Solution Approach 1:
The retention mechanism is designed to be self-servicing through a cable and loop system that can be easily engaged and disengaged by the operator without requiring additional tools or complex mechanisms. The cable passes through the housing and is secured with a retainer, allowing the operator to quickly secure or release the adapter as needed.
Data Source
AI summary
A drawbar pin adapter which can allow a smaller drawbar pin to be used with a larger drawbar. A drawbar pin adapter is provided for a tractor drawbar having a lower strap, an upper strap and a drawbar pin bore which extends through the upper and lower straps and which receives a drawbar pin. The adapter includes a cylindrical bushing mountable in the drawbar pin bore in the lower strap and a hollow housing which is mountable over the lower strap. The housing includes a lower plate, an upper plate and left and right side plates. The upper plate has an upper bore formed therein, and the lower plate has a lower bore formed therein. The upper and lower bores have a diameter which is smaller than an outer diameter of the bushing so that the upper and lower plates hold the bushing within the drawbar pin bore in the lower strap. The bushing and the upper and lower bores receive the drawbar pin when it is inserted through the upper and lower straps. A retainer retains the housing to the drawbar when the drawbar pin is removed from the drawbar pin bore. The retainer includes a cable coupled to the housing and looped around a portion of the drawbar.