Rail Threader Workhead Articulation for Precision Rail Placement
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Solution Overview
Problem
Existing rail installation machines are imprecise, time-consuming, and difficult to use for placing railroad rails on ties due to limited operator visibility and single operator station configurations, which hinder efficient and precise rail placement.
Innovation Solution
A rail threader workhead apparatus with independently pivotable components, including a vertically pitching first apparatus, horizontally yawing second apparatus, and rollably pivoting third apparatus, equipped with hydraulic cylinders and roller assemblies, allowing for precise and efficient rail placement and engagement with railroad ties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single operator station is used, then the device complexity is reduced, but the operator's ability to see and control placement of both inside rail and outside rail is inhibited
Solution Approach 1:
The patent introduces a dual operator station configuration where one operator sits in the conventional cab position and another operator sits in a rear-mounted cab position. This spatial arrangement in a different dimension (rear vs. front) allows both operators to have optimal visibility and control for their respective rail placement tasks without interfering with each other, resolving the contradiction between ease of operation and device complexity.
2Productivity
If a crane is used to hoist rail sections, then the installation speed is improved, but the precision and consistency of rail placement deteriorates
Solution Approach 1:
The rail placement function is segmented into two independent systems: a crane system for rapid hoisting of rail sections to approximate position, and a rail threader workhead system for precise final placement. This segmentation allows each system to optimize for its specific function - the crane for speed and the threader for precision - thereby resolving the contradiction between installation speed and placement precision.
Solution Approach 2:
The rail threader workhead acts as an intermediary device between the crane and the final rail installation. The crane first hoists the rail section to near the installation location, then the threader workhead takes over to perform the precise threading operation under the tie plate lug. This intermediary system bridges the gap between rapid transport and precision placement, resolving the speed-precision contradiction.
3Productivity
If traditional rail placement methods are used, then the device complexity is reduced, but the time required for rail installation increases
Solution Approach 1:
The patent merges multiple functions into a single integrated rail threader workhead apparatus: the roller assembly for engaging the rail, the threading mechanism for inserting under the tie plate lug, and the positioning system for precise placement. By combining these functions that were previously separate operations or devices, the system reduces overall installation time while managing device complexity through functional integration rather than sequential processes.
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
Enables precise and efficient placement of railroad rails on ties, improving operator visibility and allowing for simultaneous or sequential operation of components to maximize natural rail bending, thus enhancing installation speed and accuracy.
Implementation Method 1
The manipulator apparatus may include one or more hydraulic cylinders configured to articulate the manipulator apparatus in a vertical, pitch direction; articulate the manipulator box in a horizontal, yaw direction; and articulate the manipulator head in a cant or roll direction
Implementation Method 2
The manipulator head may include a pair of roller assemblies configured to engage a railroad rail
Data Source
AI summary
A rail threader workhead is disclosed for attachment to an end of a rail machine boom and configured for placing a railroad rail upon a section of railroad ties. The rail threader workhead includes a first apparatus for mounting to the end of the rail machine boom and operable to pivot in a vertical pitch direction, a second apparatus extending from the first apparatus and operable to pivot in a horizontal yaw direction, and a third apparatus extending from the second apparatus. The third apparatus includes a pair of roller assemblies configured to engage the railroad rail, the third apparatus configured to pivot in a cant or roll direction.