Roof Window Handle Shock-Absorbing Bushing
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Solution Overview
Problem
Roof windows face damage risks due to external loads during normal operation, installation, maintenance, or sudden impacts, as the sash member with the handle is exposed and lacks adequate shock absorption.
Innovation Solution
A roof window design featuring a handle connected to the sash bottom member with a shock-absorbing bushing that extends over a significant portion of the handle shaft, providing an interference fit and using a thermoplastic elastomer material for effective shock absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the handle is connected directly to the sash bottom member without additional protection, then the design remains simple and cost-effective, but the sash member is vulnerable to damage from external loads and impacts
Solution Approach 1:
A shock-absorbing bushing is introduced as an intermediary component between the handle shaft and the sash bottom member. This bushing absorbs external loads and impacts, protecting the sash member from damage while maintaining the overall simplicity of the design. The bushing acts as a mediator that isolates the vulnerable sash component from harmful external forces.
Solution Approach 2:
The shock-absorbing bushing provides beforehand cushioning by being pre-installed in the handle assembly before potential impacts occur. The bushing is positioned to absorb external loads and sudden impacts before they can reach and damage the sash bottom member, effectively protecting the structure in advance of any harmful events.
2Object-affected harmful factors
If the shock-absorbing bushing covers the entire shaft length, then maximum shock absorption is achieved, but the handle design becomes more complex and assembly more difficult
Solution Approach 1:
The shock-absorbing bushing is applied selectively to only the necessary portion of the shaft that requires protection, rather than covering the entire length. This local application of the bushing provides adequate shock absorption for the critical areas while avoiding unnecessary complexity in the handle design and assembly process.
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 solution effectively mitigates damage risks by absorbing external loads, ensuring the handle's accessibility and simplicity while maintaining mechanical reliability and cost-effectiveness, with the bushing acting as an additional security element.
Implementation Method 1
a shock-absorbing bushing having a predefined length, at least one outer cross-sectional dimension and an opening with at least one cross-sectional dimension, and extending about the shaft
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
In a roof window, the sash (2) is opened and closed relative to the frame (1) by means of operating means including a handle (5) rotatably connected to a sash bottom member (24) and comprising a shaft (55) with a predefined length (Ls) and a cross-sectional dimension (Hs) lodged in an aperture (245) in the sash bottom member (24). Turning the handle (5) by its grip (51), a pawl (56) interacts with a striking plate (8) connected to the frame bottom member (14). The handle (5) is provided with a shock absorbing bushing (9) having a predefined length (L), at least one outer cross-sectional dimension (D) and an opening (92) with at least one cross-sectional dimension (H), and extending about the shaft (55).