Nested Threaded Rod Ratcheting Tightener Design
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Solution Overview
Problem
Ratcheting tighteners face a trade-off between achieving sufficient clamp travel and maintaining a short overall length, as existing designs require long lengths for adequate clamping force or compromise on usable clamp travel due to the limitations of opposite-handed threads.
Innovation Solution
The design incorporates a threaded rod with internal threads of different diameters, allowing one end piece's threaded rod to engage into the other, along with a locking screw to prevent rotation, and features like snap rings and end caps for end stops to prevent accidental unscrewing, enabling efficient length adjustment and secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the threaded rod of one end piece engages into the threaded rod of the other end piece with internal threads of different diameters, then the overall length is minimized, but the manufacturing complexity increases
Solution Approach 1:
The threaded rod of one end piece is inserted into the threaded rod of the other end piece, creating a nested configuration. This nesting allows the tightener to achieve sufficient clamp travel while minimizing the overall length, as the threaded rods are arranged concentrically rather than linearly end-to-end.
Solution Approach 2:
The internal threads of the threaded rods have different diameters to match the nested configuration. The first threaded rod has a first internal thread diameter, while the second threaded rod has a second internal thread diameter, allowing each to engage with its corresponding external thread while maintaining the compact nested structure.
2Length of moving object
If opposite-handed threads are used at the ends of the threaded rod, then the clamp travel is adjusted, but the overall length increases
Solution Approach 1:
By nesting the threaded rods with opposite-handed internal threads within each other, the design achieves the necessary clamp travel adjustment capability while avoiding the linear length increase that would occur with traditional end-to-end configurations. The nested arrangement allows both threads to contribute to clamping force in a compact space.
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
This configuration ensures sufficient clamp travel with a minimized overall length, enhances security against accidental loosening, and allows for easy maintenance through lubrication, effectively addressing the limitations of prior art.
Implementation Method 1
Screwthreads 5 and 6 of opposite hand are provided at the ends of the internally threaded tube 2 and that have a right-hand thread on the one hand and as a left-hand thread on the other hand. By rotating the internally threaded tube 2, the end pieces 3 and 4 are simultaneously screwed into or out of the internally threaded tube 2
Implementation Method 2
The threaded rod has at least one locking screw that prevents rotation between the end piece and threaded rod
Implementation Method 3
features like snap rings and end caps for end stops to prevent accidental unscrewing
Data Source
AI summary
The invention relates to a ratchet tightener for tensioning chains, belts and similar, comprising two end pieces 3 and 4 between which a lead screw 2 is arranged and screwed to same, wherein the axial distance between said end pieces 3 and 4 can be altered by rotating the lead screw 2 by means of a ratchet, characterised in that the threaded rod 8 is in the form of a tube into which the threaded rod 7 can descend.