Door Hardware Damper Assembly for Quiet Exit Device Operation
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Solution Overview
Problem
Conventional door hardware, particularly exit devices, generate excessive noise that exceeds industry-recommended levels, contributing to undesirable environmental noise and hindering effective noise performance evaluation due to the lack of a standardized metric for quantifying sound output.
Innovation Solution
A noise-reducing mechanism for door hardware incorporating a housing, damper, and stop to slow operational movement, utilizing components like a drive rod damper assembly and connector link damper assembly to reduce noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional exit devices are used to ensure quick door operation, then door opening speed is improved, but noise generation increases beyond acceptable levels
Solution Approach 1:
The patent applies beforehand cushioning by incorporating dampers that engage before the door hardware components complete their movement. The damper is positioned to engage the stop before final contact, cushioning the deceleration process and reducing impact noise while maintaining quick door operation. This resolves the contradiction by preparing the noise reduction mechanism in advance rather than reacting to noise after it occurs.
Solution Approach 2:
The patent uses an intermediary approach by introducing a damper as a mediating element between the moving door hardware components and the stationary structure. The damper absorbs and dissipates the energy that would otherwise be converted into noise, allowing quick door operation while reducing harmful noise generation through this intermediate energy-absorbing component.
2Productivity
If door hardware components move quickly for efficient operation, then productivity is improved, but noise and vibration increase
Solution Approach 1:
The patent applies dynamics by creating a system that adapts its behavior based on the operational phase. During the main movement phase, the door hardware operates quickly for efficiency. As the movement nears completion, the damper engages to dynamically adjust the deceleration, reducing noise and vibration. This dynamic transition maintains productivity while minimizing harmful factors at critical moments.
3Object-generated harmful factors
If the operational movement of door hardware is slowed down to reduce noise, then noise generation is reduced, but door operation time increases
Solution Approach 1:
The patent applies partial action by only slowing down the door hardware movement during the specific phase when noise generation is problematic (near the end of movement when components contact). The majority of the door operation maintains full speed for efficiency, while only the critical noise-generating portion is dampened. This selective approach reduces noise without significantly increasing overall operation time.
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 mechanism effectively reduces noise during door hardware operation by slowing down the movement of components, aligning with industry standards and improving noise evaluation metrics.
Implementation Method 1
The damper is configured to slow the operational movement, thereby reducing noise generated by operation of the door hardware
Data Source
AI summary
An exemplary noise-reducing mechanism for door hardware includes a housing, a damper, and a stop. The door hardware includes a first component and a second component, and an operational movement of the door hardware causes relative movement of the first and second components. The housing is mounted to the first component, and the damper is mounted to the housing. The stop is mounted to the second component such that the stop engages the damper during the operational movement. The damper is configured to slow the operational movement, thereby reducing noise generated by operation of the door hardware.