Door Closer Regulation Screw Indicator for Leak-Free Adjustment
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Solution Overview
Problem
Hydraulic door closers face issues with fluid leakage when the regulation screw is backed out too far, leading to system failure, due to the lack of effective adjustment mechanisms that prevent fluid loss.
Innovation Solution
Incorporation of a regulation screw with external threading engaged with internal threading in the body, along with an indicator that projects beyond the surface when the screw reaches a reference position, preventing overwithdrawal and leakage by providing a visual warning to the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the regulation screw is backed out to increase adjustment range, then the screw can be adjusted further, but hydraulic fluid will leak from the passage causing system failure
Solution Approach 1:
The patent applies preliminary action by providing a visual indicator that warns the operator before the regulation screw is backed out too far. The indicator projects beyond the surface at a predetermined position, alerting the operator to stop before reaching the point where hydraulic fluid leakage would occur. This preventive warning system allows the screw to be adjusted further while maintaining system reliability.
2Ease of operation
If the regulation screw is backed out too far, then adjustment flexibility increases, but hydraulic fluid leakage occurs leading to closer failure
Solution Approach 1:
The patent implements feedback by using a visual indicator that provides real-time information to the operator about the regulation screw's position relative to the safe adjustment limit. As the screw is backed out, the indicator's position changes, giving continuous feedback that prevents the operator from backing it out too far and causing hydraulic fluid leakage, thus maintaining adjustment flexibility without harmful effects.
Solution Approach 2:
The patent applies color changes by using an indicator that can be made visible through color contrast or visual differentiation. The indicator projects beyond the surface at a predetermined position, and its visual characteristics (such as color) help the operator easily identify the safe adjustment limit, preventing over-backing out that would cause hydraulic fluid leakage while maintaining ease of adjustment.
3Device complexity
If no indicator is provided, then the device structure remains simple, but the operator cannot determine the reference position leading to overwithdrawal
Solution Approach 1:
The patent applies segmentation by dividing the regulation screw into functional segments: the threaded portion that engages with the body, the indicator portion that projects beyond the surface at a predetermined position, and the sealing portion. This segmentation allows the indicator to provide precise position information without significantly complicating the overall structure, as the indicator is integrated as a distinct segment of the screw assembly.
Solution Approach 2:
The patent applies the nested doll principle by integrating the indicator within the regulation screw structure itself. The indicator is formed as part of the screw assembly, nested within the same component rather than being a separate external device. This integration provides precise position indication while minimizing additional structural complexity, as the indicator is essentially a feature of the existing screw rather than an added component.
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 prevents hydraulic fluid leakage by ensuring the regulation screw remains within a secure position, maintaining the system's functionality and preventing fluid loss, thus enhancing the reliability of hydraulic door closers.
Implementation Method 1
a piston that reciprocates within a body, which is filled with a hydraulic fluid that resists the movement of the piston
Implementation Method 2
an adjustable regulation screw valve controls the rate of fluid flow through the passage to modulate the speed of the piston
Data Source
AI summary
An exemplary door closer includes a body, a regulation screw, and an indicator. The body includes a surface and a cavity extending from the surface into the body, and the cavity includes an internal threading. The regulation screw is mounted in the cavity and includes an external threading engaged with the internal threading. The indicator is engaged with the regulation screw and positioned at least partially within the cavity. The indicator is positioned to project beyond the surface when the regulation screw is withdrawn to a reference position relative to the body.