Cable Pull Station Release Mechanism for Low Activation Force
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Solution Overview
Problem
Manual activation systems for fire suppression systems, such as cable pull stations, require excessive force to operate due to the tension from the cable acting on the pulley, making them difficult for users to activate.
Innovation Solution
A manual activation system with a movable pulley and a mechanical assembly comprising link arms and biasing mechanisms that oppose the tensile force, allowing the pulley to move from an inactive to an active position with reduced user effort by releasing the tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pin supports the pulley in a housing to maintain cable tension, then the fire suppression system remains inactive and ready for activation, but a large amount of force is required to remove the pin, making the system difficult for a user to operate
Solution Approach 1:
The system divides the force resistance function into two parts: the link arms handle the cable tension force, and the activation member handles the user activation. This segmentation allows the pin to be removed easily while maintaining system reliability through the link arm mechanism that opposes tension force.
Solution Approach 2:
The link arms act as intermediaries between the cable tension and the pulley housing. They rotate to engage with the housing feature, creating a mechanical barrier that maintains cable tension without requiring a pinned connection that is difficult to remove.
2Device complexity
If all cable tension acts on the pulley and supporting pin, then the mechanism is simple in structure, but excessive force is required to activate the system
Solution Approach 1:
The link arms provide a counteracting force to the cable tension through their rotation and engagement with the housing feature. This counter-force mechanism reduces the activation force needed by the user while maintaining overall mechanical simplicity.
Solution Approach 2:
The link arms transition from a static pinned connection to a dynamic rotating mechanism. During activation, the link arms rotate to disengage from the housing feature, allowing the pulley to move freely. This dynamic behavior reduces activation force while maintaining structural simplicity.
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 system reduces the required activation force by maintaining the pulley in an inactive position until the activation member is moved, enabling easier operation and efficient activation of the fire suppression system.
Implementation Method 1
at least one biasing mechanism operably coupled to the at least one link arm, the at least one biasing mechanism being configured to apply a biasing force on the at least one link arm
Implementation Method 2
the bracket and the pulley coupled to the bracket to move to the active position in response to the tensile force acting on the pulley by the tension member
Data Source
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AI summary
A manual activation system includes a housing and a pulley arranged within the housing. The pulley is movable between an inactive position and an active position. A tension member is wrapped about the pulley and has a tensile force acting on the pulley. At least one link arm is rotatably mounted within the housing. The at least one link arm is operably coupled to the pulley to selectively oppose the tensile force acting on the pulley.