Door closer regulating screw stop member
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Solution Overview
Problem
Existing hydraulic door closers face issues with fluid leakage due to improper adjustment of the screw valve, leading to system failure, as the screw can be backed out too far, causing hydraulic fluid to leak from the passage.
Innovation Solution
A door closer design featuring a regulating screw with a stop member that limits the withdrawing movement of the screw, preventing hydraulic fluid leakage by engaging threads and a seal, and utilizing various stop member configurations to secure the screw in place, such as retention rings, blocking spheres, and threaded retention rings, to prevent excessive withdrawal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the screw valve is backed out too far to allow adjustment, then the ease of operation is improved, but the reliability deteriorates as hydraulic fluid leaks from the passage
Solution Approach 1:
The stop member is pre-installed in the aperture to prevent the regulating screw from being backed out too far. This preliminary protective measure stops the harmful action (excessive withdrawal causing leakage) before it can occur, allowing easy adjustment within safe limits while preventing reliability failure.
Solution Approach 2:
The stop member acts as an intermediary element between the regulating screw and the aperture. It mediates the interaction by providing a physical barrier that limits the screw's withdrawal distance, enabling easy adjustment operation while preventing the screw from being backed out far enough to cause hydraulic fluid leakage.
2Ease of operation
If the regulating screw is allowed to be withdrawn freely, then the ease of operation is improved, but hydraulic fluid leakage occurs causing system failure
Solution Approach 1:
The stop member provides preliminary protection by being positioned in the aperture to prevent the regulating screw from being withdrawn to a position that would cause hydraulic fluid leakage. This pre-established barrier allows free adjustment within safe limits while preventing the harmful leakage effect.
Solution Approach 2:
The stop member serves as an intermediary that limits the withdrawal distance of the regulating screw. It enables adjustment freedom by allowing the screw to be moved within safe boundaries while preventing excessive withdrawal that would generate the harmful effect of hydraulic fluid leakage from the passage.
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
Prevents hydraulic fluid leakage by ensuring the regulating screw remains within a secure position, maintaining the system's integrity and functionality while allowing for adjustable fluid flow regulation to control door movement speeds.
Implementation Method 1
a piston that reciprocates within a housing, which is filled with a hydraulic fluid that resists the movement of the piston
Implementation Method 2
an adjustable regulation 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 housing defining a hydraulic chamber having a hydraulic fluid disposed therein. A pinion is rotatably mounted to the housing and extends into the hydraulic chamber. A piston is mounted for reciprocal movement within the housing, and defines a rack engaged with the pinion. The housing further defines an aperture in fluid communication with the hydraulic chamber. A regulating screw is rotatably mounted within the aperture such that rotation of the regulating screw in a first direction advances the regulating screw into the hydraulic chamber and such that rotation of the regulating screw in an opposite second direction withdraws the regulating screw away from the hydraulic chamber. A stop member is mounted in the aperture such that the stop member limits withdrawing movement of the regulating screw to thereby prevent leaking of the hydraulic fluid from the hydraulic chamber via the aperture.