Door Stopper with Knocker for Ergonomic Holding
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Solution Overview
Problem
Existing door stoppers are ineffective in holding open heavy doors without causing injury to users or damage to doors and floors, as they require bending and apply excessive torque, leading to repetitive injuries and surface damage.
Innovation Solution
A door stopper with a knocker apparatus comprising a doorstop, a cord, and a solid knocker that allows upright placement on the ground, using gravity and friction to hold doors open without requiring users to bend, and is designed with soft materials to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing door stops are used to hold heavy doors open, then the door can be kept open, but users must bend over to place the door stop and expose body parts to dangerous areas
Solution Approach 1:
The door stop incorporates a long handle that acts as an intermediary tool, allowing users to place the door stop from a standing position without bending over. The handle extends the user's reach and eliminates the need to place the door stop directly with hands, thereby reducing injury risk while maintaining ease of operation.
Solution Approach 2:
The door stop design extends into a third dimension by incorporating a vertical handle component. This dimensional addition allows the door stop to be deployed from an upright position rather than requiring bending, changing the operational dimension from horizontal placement to vertical engagement.
2Ease of operation
If existing door stops apply torque to hold doors open, then the door can be kept open, but excessive torque causes damage to doors and floors
Solution Approach 1:
The door stop changes the parameter of force application by using a spring mechanism that provides controlled, progressive resistance rather than requiring high torque. The spring compresses to absorb the door's weight and maintain it open, reducing the peak forces applied to the door and floor surfaces.
Solution Approach 2:
The spring mechanism serves as a cushioning element that absorbs and distributes the forces required to hold the door open. This beforehand cushioning prevents sudden, high-torque applications that would damage surfaces, replacing harsh mechanical force with a buffered, controlled response.
3Duration of action of stationary object
If heavy doors are held open with existing door stops, then the door remains open, but repetitive bending causes injuries to users
Solution Approach 1:
The long handle serves as an intermediary that enables door deployment from an upright position, eliminating repetitive bending motions. Users can maintain a neutral posture while operating the door stop, thereby preventing repetitive strain injuries while maintaining the ability to hold doors open for extended periods.
Solution Approach 2:
The spring mechanism provides self-service by automatically maintaining door openness without requiring continuous user intervention or repetitive positioning actions. The spring sustains the door in the open position through elastic potential energy, eliminating the need for repeated manual adjustment and associated injuries.
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 enables safe and ergonomic operation by eliminating the need for bending and excessive force, effectively holding open heavy doors without damaging surfaces, reducing the risk of injury and wear and tear.
Implementation Method 1
using gravity and friction to hold doors open without requiring users to bend
Implementation Method 2
using gravity and friction to hold doors open without requiring users to bend
Data Source
AI summary
Some embodiments provide a door stopper with knocker apparatus for holding open a door. In some embodiments, the door stopper with knocker apparatus comprises a doorstop, a cord, and a knocker. In some embodiments, the door stopper with knocker apparatus is configured to allow an upright person place the doorstop in a position on the ground to hold the door open.