Door Closing Force Minimization via Pneumatic Damping
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Solution Overview
Problem
Self-closing door hinges generate a significant closing force that can cause doors to slam shut loudly due to rapid movement, resulting in noise and potential damage when the door forcefully contacts the frame.
Innovation Solution
A door closing force minimization apparatus comprising a housing with a piston and compression spring, and a button that engages the door frame to slow the door's movement, utilizing pneumatic or hydraulic damping to absorb forces and resist the closing motion, thereby reducing speed and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If self-closing hinges are used to automatically return the door to closed position, then the door closing function is improved, but the closing force becomes too strong causing loud slamming noise
Solution Approach 1:
A button extending from the door edge acts as an intermediary element that engages with the door frame to provide controlled resistance during door closure. This mediator transforms the direct strong contact between door and frame into a gradual deceleration process, reducing slamming noise while maintaining automatic closing functionality
Solution Approach 2:
A pneumatic or hydraulic piston-damper mechanism is incorporated into the device. The piston moves within a cylinder filled with viscous fluid, creating resistance that dampens the door's closing motion. This pneumatic/hydraulic damping effect reduces the door's closing speed and absorbs impact energy, eliminating loud slamming noise
2Reliability
If self-closing hinges generate significant closing force, then the door returns to closed position reliably, but the door forcefully contacts the door frame causing potential damage
Solution Approach 1:
The button extending from the door edge provides beforehand cushioning by making contact with the door frame before the main door body reaches the frame. This initial contact gradually absorbs the closing force and reduces the impact speed, preventing forceful contact and potential damage to the door frame while maintaining reliable door closure
Solution Approach 2:
The pneumatic or hydraulic piston mechanism provides progressive resistance during door closure, absorbing impact energy through fluid viscosity and compression. This dampening effect reduces the force of contact between door and frame, protecting the door frame from damage while ensuring the door reliably returns to closed position
3Productivity
If the door closes at high speed, then the automatic closing function is efficient, but the closing noise increases significantly
Solution Approach 1:
The pneumatic or hydraulic piston-damper mechanism creates velocity-dependent resistance that automatically adjusts to the door's closing speed. As the door approaches the closed position, the piston's movement through the viscous fluid generates increasing damping force, progressively reducing closing speed and minimizing noise without compromising the overall efficiency of the automatic closing function
Solution Approach 2:
The button extending from the door edge serves as a mediator that engages with the door frame to provide controlled friction and resistance. This intermediary contact gradually reduces the door's closing speed during the final approach, transforming high-speed closure into a slower, quieter closing action while maintaining the efficiency of automatic door closing
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 apparatus effectively reduces the closing force and speed of the door, minimizing noise and potential damage by absorbing and resisting the closing motion, providing a quieter and gentler door closure.
Implementation Method 1
a compression spring disposed on the piston rod between the distal end of the cylinder and the piston head
Implementation Method 2
utilizing pneumatic or hydraulic damping to absorb forces and resist the closing motion
Implementation Method 3
utilizing pneumatic or hydraulic damping to absorb forces and resist the closing motion, thereby reducing speed and noise
Data Source
AI summary
An apparatus is provided for minimizing closing force of a door. The apparatus comprises a housing adapted to be disposed in the hinged edge of the door. A piston is slidably mounted in the bore. A button having an inner end and an outer end is disposed in the bore with the inner end of the button engaging the piston for urging the button toward a first extended position where the button extends from the edge of the door. The button is slidable in the bore relative to the housing for reciprocal movement between the extended position and a second position where the button is depressed into the bore against the force of the piston. The button is disposed so that the outer end of the button engages the door frame for slowing movement of the door in a closing direction as the button is moved into the bore to the depressed second position.