Reciprocating Pull Rod Chain Drive for Safer Curtain Operation
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Solution Overview
Problem
Conventional curtain systems with pull cords pose safety hazards, particularly for young children, and existing cordless systems suffer from installation difficulties, reliability issues, and high costs.
Innovation Solution
A reciprocating type pull rod driving apparatus with a housing, shaft rod, driving wheel, and chain mechanism that allows for easy disengagement and re-engagement of the chain, reducing the chain length and enabling a reciprocating action, thereby enhancing safety and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a long pull cord is used to drive the curtain, then the curtain can be opened and closed, but safety hazards arise for young children
Solution Approach 1:
The patent extracts the harmful long pull cord from the system and replaces it with a short pull rod mechanism. The pull rod is engaged with a driving wheel that has engagement teeth, allowing the curtain to be operated without a long cord extending into the room, thereby eliminating the safety hazard while maintaining operational functionality.
2Reliability
If the gap between the housing inner wall and sprocket radial outer end edge is set to be very small, then the bead chain is tightly engaged with the sprocket, but the chain cannot be easily disengaged
Solution Approach 1:
The patent applies a dynamic gap design where the gap between the housing inner wall and the driving wheel radial outer end edge is set to be greater than or equal to the thickness of the chain. This dynamic spacing allows the chain to be easily inserted and disengaged from the engagement teeth during operation, while still maintaining reliable engagement when the pull rod is pulled, thus resolving the contradiction between tight engagement and easy disengagement.
3Object-affected harmful factors
If existing cordless curtains are used, then safety hazards are eliminated, but installation difficulty and reliability issues arise
Solution Approach 1:
The patent designs a self-service mechanism where the pull rod is directly engaged with the driving wheel through engagement teeth, eliminating the need for complex cordless mechanisms. The chain can be easily inserted and removed from the engagement teeth by the user, and the pull rod can be pulled to operate the curtain without requiring professional installation or complex assembly, thus reducing installation difficulty while maintaining safety.
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 apparatus significantly shortens the chain length, improves operating convenience, and ensures safer operation by eliminating the need for long pull cords, while maintaining reliable power transmission.
Implementation Method 1
The driving wheel includes a plurality of engagement teeth; the chain is engaged with the plurality of engagement teeth of the driving wheel. A quantity of the plurality of engagement teeth of the driving wheel that the chain is engaged with is less than or equal to a half of a total quantity of the plurality of engagement teeth.
Data Source
AI summary
A reciprocating type pull rod driving apparatus, including a housing, a shaft rod, a driving wheel, a chain, and an operating assembly. One end of the shaft rod extends to the housing. The driving wheel is arranged on the shaft rod. The chain is meshed with multiple engagement teeth of the driving wheel. The operating assembly is connected to the chain and configured to operate the chain to drive the driving wheel to rotate. A distance between a radial outer end edge of the driving wheel and an inner wall of the housing is greater than or equal to a thickness of the chain, and a quantity of driving wheel teeth that the chain is meshed with is less than a half of a total quantity of teeth.