Door Closer Sealing Plug Radial Rotation Mechanism
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Solution Overview
Problem
Existing door closer end cap designs are costly to manufacture, require complex coordination, and are vulnerable to vandalism due to ease of removal.
Innovation Solution
A sealing plug with a radial rotation mechanism and spring arms is integrated into the door closer housing, providing a secure and cost-effective solution that blends seamlessly with the housing design, making it difficult for unauthorized individuals to remove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end cap is attached using grooves and fastening contours, then the end cap can be secured to the housing, but the manufacturing costs increase and coordination complexity increases
Solution Approach 1:
The attachment system is segmented into a receptacle fixed in the housing and a separate link on the end cap. The receptacle contains a receiving contour that interacts with a protruding contour on the link, allowing the end cap to be attached through simple insertion without complex coordination between multiple features.
Solution Approach 2:
The complex groove and fastening contour system is extracted and replaced with a simpler receptacle-link mechanism. The receptacle serves as a standalone attachment feature that simplifies the overall coordination requirements while maintaining secure attachment.
2Reliability
If the end cap is attached using grooves and fastening contours, then the end cap can be secured to the housing, but manufacturing costs increase
Solution Approach 1:
The attachment system is divided into a simple receptacle in the housing and a corresponding link on the end cap. This segmentation allows each component to be manufactured independently using simpler processes, reducing overall manufacturing costs while maintaining secure attachment through the interacting contours.
3Ease of operation
If the end cap is made removable for maintenance, then accessibility is improved, but vulnerability to vandalism increases
Solution Approach 1:
The end cap is designed with a specific local feature - a protruding contour on the link that must align with and engage the receiving contour in the receptacle. This local geometric constraint allows authorized maintenance personnel to remove the end cap while preventing unauthorized removal by vandals who lack the proper tooling or knowledge.
4Ease of manufacture
If there is a gap between the end cap and cover, then manufacturing tolerances are easier to accommodate, but the appearance becomes unacceptable
Solution Approach 1:
The end cap attachment system incorporates a slight rotational movement during insertion, where the link rotates radially as it engages with the receptacle. This dynamic insertion process allows the end cap to self-align and eliminate gaps, achieving a uniform appearance while accommodating manufacturing tolerances through the rotational adjustment.
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 enhances security by concealing the removable nature of the plug, reduces manufacturing costs, and ensures a uniform appearance, while maintaining structural integrity against dynamic effects.
Implementation Method 1
the sealing plug being fixed radially by at least one spring arm which is arranged on the sealing plug
Data Source
Figure 1~2
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Figure 5~6
AI summary
The invention relates to a sealing plug (10) for sealing an opening (80) of a door closer housing (20) at an end face. According to the invention, a receiving portion (30) is arranged in the opening (80) of the door closer housing (20), and the sealing plug (10) has a web (45) having a gate (35), wherein when the sealing plug (10) is inserted into the opening (80), the receiving portion (30) interacts with the gate (35) in such a way that the sealing plug (10) rotates radially and the gate (35) guides the sealing plug (10), wherein the sealing plug (10) is axially fixed in a longitudinal axis (85) and the sealing plug (10) is radially fixed by at least one spring arm (50, 55), which is arranged on the sealing plug (10).