Pulley Ratchet Mechanism with Pivoting Gripping Elements
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Solution Overview
Problem
Existing ratchet pulleys are complex to manufacture, increasing costs and making it difficult for users to wind ropes due to the guiding surface design, which complicates one-way rope direction locking.
Innovation Solution
A pulley design incorporating a tensioning device with a ratchet mechanism featuring actuating elements, gripping elements made by punching, and an elastic element that allows for easy direction control of rope pulling by pivoting the actuating element between two positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guiding surface is provided to push the rope toward the ratchet halves to prevent friction loss, then the rope direction control is improved, but the structure becomes complicated and manufacturing cost increases
Solution Approach 1:
The patent removes the guiding surface from the housing structure and extracts the rope direction control function to the gripping elements themselves. The gripping elements are designed to automatically guide the rope through their geometry and positioning, eliminating the need for separate guiding surfaces while maintaining reliable rope direction control.
Solution Approach 2:
The gripping elements serve multiple functions: they grip the rope, control rope direction, and enable one-way locking. By integrating these functions into the gripping elements rather than requiring separate components like guiding surfaces, the patent reduces structural complexity while maintaining reliability.
2Reliability
If guiding surfaces are added to control rope direction, then rope locking reliability is improved, but manufacturing cost increases due to complex molds
Solution Approach 1:
The patent extracts the rope direction control function from separate guiding surfaces and integrates it into the gripping elements. This allows the housing to be manufactured with simpler molds, reducing manufacturing cost while maintaining one-way locking reliability through the gripping element design.
Solution Approach 2:
The patent merges the rope direction control function with the gripping elements, combining multiple functions into a single component. This integration eliminates the need for complex guiding surfaces and reduces manufacturing complexity and cost.
3Reliability
If the rope is winded between first and second ratchet halves with guiding surfaces, then one-directional rope movement is achieved, but user convenience deteriorates due to difficult rope winding
Solution Approach 1:
The patent removes the guiding surfaces that made rope winding difficult and transfers the one-directional movement control function to the gripping elements and actuating mechanism. This allows users to easily wind the rope without obstruction while still achieving reliable one-directional movement control.
Solution Approach 2:
The patent introduces a dynamic actuating mechanism that allows the gripping elements to be temporarily disengaged or adjusted during rope winding, making the process easier for users. Once wound, the mechanism automatically engages to maintain one-directional movement control.
4Reliability
If complex ratchet half structures with ridges are used, then one-way locking is achieved, but device complexity increases
Solution Approach 1:
The patent segments the ratchet mechanism into distinct gripping elements with teeth that engage with corresponding features. This segmentation allows for simpler individual components that can be manufactured separately and assembled, reducing overall structural complexity while maintaining one-way locking reliability.
Solution Approach 2:
Instead of using complex ridges on ratchet halves, the patent inverts the approach by using gripping elements with teeth that engage in a simplified manner. The locking action is achieved through the engagement of these teeth with corresponding features, providing one-way locking with simpler geometry.
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
Simplifies manufacturing, reduces costs, and enhances user convenience by allowing easy direction control of rope pulling, enabling efficient one-way locking and free pulling of the rope.
Implementation Method 1
an elastic element that allows for easy direction control of rope pulling by pivoting the actuating element between two positions
Data Source
AI summary
A pulley includes a tensioning device and a ratchet device disposed in the tensioning device. The tensioning device includes a first shell, a second shell installed to the first shell, and a first compartment defined in a side thereof. The tensioning device further includes a first block and a second block located in the first compartment, with the first and second blocks adapted to pivot in the tensioning device. The ratchet device includes an actuating element, a ratchet, a first gripping element and a second gripping element, with the ratchet, the first and second gripping elements mounted onto the first block in sequence, with the actuating element provided to control the pivoting direction of the ratchet as to limit the direction of pulling a rope, which is winded between the first and second gripping elements.