Torsion Release Pulley Node for Fire Cable Displacement Gain
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Solution Overview
Problem
Current fire suppression systems in commercial kitchens lack a mechanism to multiply the available displacement of detection links, leading to a need for additional control boxes, which increases complexity and cost.
Innovation Solution
An activation system featuring a pulley and tension members that convert limited detection cable displacement into a larger displacement value, allowing the system to actuate the fire suppression agent effectively without requiring additional control boxes by using a pulley and tension members to restrict and then release rotational motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a pulley and tension member system is added to multiply displacement, then the displacement available at the control panel is increased, but the device complexity increases
Solution Approach 1:
A pulley assembly acts as an intermediary mechanical device between the detection link and control panel. The pulley with its groove and tension members creates a mechanical advantage system that multiplies the limited displacement of the detection link into sufficient movement at the control panel, resolving the contradiction by introducing a mediating mechanism that transforms the displacement without requiring additional control boxes
Solution Approach 2:
The activation member transitions between engaged and disengaged states with the pulley, creating a dynamic system. When engaged, the activation member restricts pulley rotation; when disengaged (upon detection link movement), the pulley rotates freely to multiply displacement. This dynamic engagement mechanism allows the system to adapt its mechanical advantage ratio based on operational state
2Stability of the object's composition
If the activation member is held in engagement with the pulley by tension, then the system remains stable during normal operation, but the activation force required to trigger the system increases
Solution Approach 1:
The first tension member creates a counterbalancing force that holds the activation member in engagement with the pulley during normal operation. This tension member acts as a mechanical counterweight, maintaining stable engagement and preventing premature activation. The system achieves stability through this balanced force configuration without requiring excessive activation force to overcome the tension
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 solution enables efficient actuation of fire suppression systems by converting limited detection cable displacement into a larger displacement value, reducing the need for additional control boxes and simplifying system installation, while maintaining effective fire suppression.
Implementation Method 1
An activation member is movable between a first position and a second position relative to the pulley to selectively couple to the pulley. When the activation member and the pulley are coupled, rotation of the pulley about the axis is restricted.
Implementation Method 2
A first tension member is operably coupled to the activation member and a first tension of the first tension member maintains the activation member in engagement with the pulley.
Data Source
AI summary
An activation system includes a housing and a pulley mounted to the housing. The pulley is rotatable about an axis. An activation member is movable between a first position and a second position relative to the pulley to selectively couple to the pulley. When the activation member and the pulley are coupled, rotation of the pulley about the axis is restricted. A first tension member is operably coupled to the activation member and a first tension of the first tension member maintains the activation member in engagement with the pulley. At least one second tension member is wrapped about at least one of the pulley and the activation member and has a second tension acting on the at least one of the pulley and the activation member.