Damped Door Hinge Linkage for Smooth Closing Under Heat
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Solution Overview
Problem
Conventional door hinges with compression springs fail to provide sufficient compression force to slow down the rotation speed of doors consistently, leading to high-speed closure and potential damage to mechanisms and safety hazards, and are susceptible to opening due to high temperatures.
Innovation Solution
A door hinge design incorporating a damper and sub-spring assembly that allows the link shaft to move and rotate within a hole centered on the hinge shaft, utilizing a cam profile to facilitate smooth opening and closing with minimal force, and a sub-spring mechanism to prevent opening due to heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a compression spring is used to slow down the rotation speed of the door during closing, then the door can rotate slowly at the start section, but the compression spring cannot generate sufficient compression force to support the door load when entering the progress section, causing the door to close at high speed
Solution Approach 1:
The patent transitions from a static compression spring to a dynamic damper system that provides velocity-dependent damping force. The damper generates sufficient damping force throughout the entire closing motion, not just at the start section, thereby controlling the door's rotation speed consistently from the beginning to the end of the closing operation.
Solution Approach 2:
The patent changes the force characteristics by replacing the compression spring with a damper that provides velocity-dependent damping force. This parameter change enables the damping force to adapt to the door's motion speed throughout the entire closing stroke, ensuring consistent speed control without the insufficient force problem of the compression spring.
2Reliability
If a compression spring is used to support the door load, then the door can be supported during closing, but the spring cannot generate sufficient compression force when entering the progress section, leading to high-speed closure and potential damage
Solution Approach 1:
The patent replaces the compression spring with a damper that provides dynamic damping force proportional to the door's velocity. This ensures reliable support capability throughout the entire closing motion, preventing the high-speed closure and potential damage that occurs with compression springs that cannot generate sufficient force in the progress section.
Solution Approach 2:
The patent employs a damper system that provides consistent damping force throughout the closing motion, replacing the compression spring that fails to provide sufficient force. This ensures reliable door support and prevents damage without requiring complex multi-stage spring mechanisms.
3Ease of operation
If the link shaft is fixed relative to the hinge shaft, then the structure is simple, but the door requires large force to open and close smoothly
Solution Approach 1:
The patent makes the link shaft movable relative to the hinge shaft, allowing it to move within a hole centered on the hinge shaft during door rotation. This dynamic configuration enables the link shaft to automatically adjust its position to optimize the mechanical advantage, reducing the force required to open and close the door smoothly without requiring complex external actuation mechanisms.
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
Enables stable, smooth opening and closing of doors with reduced force requirements and prevents opening due to high temperatures, enhancing durability and safety by controlling the door's motion through the damper and sub-spring mechanisms.
Implementation Method 1
a damper (60), and a sub spring assembly (70)... the damper (60) for applying a damping action on the lever during the reciprocal motion of the first and second elements
Implementation Method 2
a compression spring is built into such a door hinge and the compression spring generates a compression force at the start section where the closing operation of a door is performed and slows down the rotation speed of the shaft
Implementation Method 3
the sub spring assembly (70) to prevent opening due to heat
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
Proposed is a door hinge that includes an arm installed on a door, a housing installed in a main body of a mechanism provided with a door and connected to the arm by a hinge shaft, a damper casing connected to the arm inside the housing by the hinge shaft and having one surface supported by a support portion of the housing, a pair of main links connected to the arm inside the housing by a link shaft to linearly move, a main spring assembly including a spring lever and a main spring inserted into the spring lever, and a damper provided inside the damper casing and moving along the periphery of the arm.