Exit Device Dampener With Viscoelastic Vibration and Noise Control
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Solution Overview
Problem
Conventional exit devices on glass doors suffer from noise generation due to metal-on-metal contact and are susceptible to vibrations, which can compromise latch security and aesthetics.
Innovation Solution
A dampener is introduced between the moving components of the exit device actuator and the chassis, utilizing a thermoplastic base and viscoelastic body to absorb vibrations and reduce noise, while biasing the actuator to an unactuated position to enhance security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal components are used in the exit device, then structural strength and durability are improved, but noise generation and vibration susceptibility increase
Solution Approach 1:
The dampener acts as an intermediary element positioned between metal components (lever and chassis). It includes a viscoelastic material body that absorbs vibrations and reduces noise generated by metal-on-metal contact, while the base and mounting structure maintain the structural strength required for secure installation and operation.
Solution Approach 2:
The dampener utilizes composite material construction, combining a viscoelastic material body (for vibration absorption and noise reduction) with a base structure (for mechanical mounting and strength). This composite approach allows simultaneous achievement of noise reduction and structural integrity.
2Strength
If metal components are used in the exit device, then structural strength and durability are improved, but vibration susceptibility increases
Solution Approach 1:
The dampener serves as a mediator between metal components, with its viscoelastic material body specifically designed to absorb vibrations. This reduces the transmission of vibrations through the metal components while maintaining their structural strength and load-bearing capabilities.
Solution Approach 2:
The viscoelastic material properties of the dampener body are specifically selected to provide optimal vibration damping. The material's viscoelastic characteristics allow it to dissipate vibrational energy while maintaining the structural integrity of the surrounding metal components.
3Object-generated harmful factors
If a dampener is added to reduce noise and vibration, then noise reduction and vibration absorption are improved, but device complexity increases
Solution Approach 1:
The dampener is designed as a segmented component with distinct functional zones: a base for mounting, a viscoelastic material body for vibration absorption, and a mounting structure for integration. This segmentation allows each part to perform its specific function efficiently while keeping the overall design manageable.
Solution Approach 2:
The dampener is designed as a multi-functional component that simultaneously reduces noise, absorbs vibrations, and provides structural support for mounting. This consolidates multiple functions into a single component, reducing the need for separate noise reduction and vibration damping elements.
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 dampener effectively reduces operational noise and improves latch security by absorbing vibrations and resisting external forces, making the exit device suitable for low-noise environments without compromising user operation.
Implementation Method 1
a body formed of a second material coupled to and extending from the base. The body is configured to abut an inside surface of a chassis of the exit device. The first material is a thermoplastic and the second material is a viscoelastic material.
Implementation Method 2
utilizing a thermoplastic base and viscoelastic body to absorb vibrations and reduce noise
Data Source
AI summary
A dampener for an exit device may be disposed between a portion of an exit device actuator and an exit device chassis so that the dampener dampens vibrations to reduce noise of the exit device and/or inhibit unintentional movement of the actuator to an actuated position. The dampener may be composed at least partially of a viscoelastic material.