Window Lifter Cable Tensioner With Reinforced Ratchet Pawl
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Solution Overview
Problem
The cable in window lifting devices is prone to loosen over time, leading to operation failures due to the durability issues of the pawl, which is easily broken under strong forces, causing the cable tensioner to malfunction.
Innovation Solution
A reinforced pawl structure with a regulating stick, tube assembly, and spring mechanism, where the pawl has an elastic arm and hook portion that snaps onto ratcheting notches, and an inner cylinder supports the pawl to prevent breakage, ensuring the cable tensioner maintains its functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pawl is used to snap onto the ratchet rack for cable tensioning, then the cable tensioner can maintain cable tension, but the pawl is easily broken under strong forces and lacks durability
Solution Approach 1:
The pawl is divided into two separate components: a hook portion that engages with the ratchet rack notches, and an elastic arm that provides the snapping action. This segmentation allows each part to be optimized for its specific function, with the hook portion being simpler and more durable.
Solution Approach 2:
The elastic arm acts as an intermediary between the actuating force and the hook portion. It absorbs and distributes the strong forces during cable tensioning operations, preventing direct stress concentration on the hook portion that would cause breakage.
2Ease of manufacture
If the pawl structure is simplified for ease of manufacture, then production cost decreases, but the pawl becomes more prone to breakage under operational forces
Solution Approach 1:
By segmenting the pawl into a hook portion and elastic arm, each component can be manufactured using simpler, more cost-effective processes while maintaining overall durability. The hook portion can be made from rigid material for strength, while the elastic arm can be made from flexible material for shock absorption.
Solution Approach 2:
The pawl structure uses different materials for different parts: a rigid material for the hook portion to withstand engagement forces, and an elastic material for the arm to absorb shocks. This composite approach maintains reliability while allowing for cost-effective manufacturing of each component.
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 reinforced pawl structure effectively prevents breakage and maintains the cable tensioner's operation, ensuring reliable window lifting performance by preventing the pawl from being overloaded.
Implementation Method 1
a spring, which sleeves the outer cylinder and is clamped between the first abutting portion and the second abutting portion with preload
Implementation Method 2
The hook portion has a stopping side, the stopping side abuts against the stopping surface, and the hook portion snaps one of the ratcheting notches
Data Source
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AI summary
This disclosure is directed to a cable tensioner having a regulating stick (100), a tube assembly (200) and a spring (300). The regulating stick (100) has an abutting portion (101) and a ratchet strip (102). The ratchet strip (102) has multiple ratcheting notches (110) having a stop surface (111) and a slope (112) opposite to each other. The tube assembly (200) sleeving the regulating stick (100) has an outer cylinder (210) and an inner cylinder (240). The outer cylinder (210) has A second abutting portion (201) and a pawl (202). The pawl (202) has an elastic arm (220) and a hook portion (230). The hook portion (230) has a stopping side (231) abutting against the stop surface (111). The hook portion (230) engages one of the ratcheting notches (110). The spring (300) is preloaded and clamped between the first and second abutting portions (101, 201). One end of the inner cylinder (240) abuts a side of the hook portion (230) opposite to the stopping side (231).