Infinite Check Link System for Selective Door Positioning
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Solution Overview
Problem
Existing door check systems fail to provide selective and secure movement between a door and a frame, limiting the ability to hold the door at various positions and requiring high forces for movement.
Innovation Solution
A check system comprising a link attached to the door and frame, a housing with a tunnel and ramps, and a friction plate biased by a member, allowing for selective movement and position retention through controlled frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing door check systems are used, then the door can be held at discrete positions, but the door cannot be held at an infinite number of positions and requires high forces for movement
Solution Approach 1:
The check system transitions from a static discrete-position holding mechanism to a dynamic continuous-position holding mechanism. The link can be held at any position along its travel path within the housing tunnel, not just at predetermined locations. This is achieved through the interaction between the link friction surface and the friction plate, which can engage at any position, providing infinite holdable positions while reducing the force required for movement.
Solution Approach 2:
The system changes the friction parameter dynamically through the biasing member that applies variable frictional force between the friction plate and the link. By adjusting the biasing force, the system can hold the link at any position along its travel path, enabling continuous position control rather than discrete positions, while also reducing the force needed to move the door.
2Reliability
If high frictional forces are used to hold the door, then the door can be securely held, but the force required to move the door increases
Solution Approach 1:
The frictional holding force is made dynamic rather than static. The biasing member provides a controlled frictional force that is sufficient to hold the door securely at any position, but allows for easy movement when force is applied. The system transitions between a high-friction holding state and a low-friction movement state, achieving both secure holding and ease of operation.
Solution Approach 2:
The friction plate acts as an intermediary between the link and the housing ramp. It provides the necessary frictional force to hold the door securely while allowing smooth movement when actuated. The biasing member mediates the frictional interaction, providing just enough force for secure holding without creating excessive resistance to movement.
3Adaptability or versatility
If a simple check system is used, then the device complexity is low, but the ability to provide selective movement and position retention is limited
Solution Approach 1:
The check system performs multiple functions with a unified structure. The same components (link, housing, friction plate, biasing member) provide both the selective movement capability and the position retention function. The link can be held at any position along its travel path while also enabling smooth movement between positions, achieving high adaptability without proportionally increasing complexity.
Solution Approach 2:
The biasing member automatically provides the necessary frictional force to hold the link at any position without requiring external control mechanisms. The system self-regulates the frictional engagement between the friction plate and the link, providing selective position retention and movement capability through its inherent mechanical design rather than complex control systems.
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 the door to be held at an infinite number of positions and moved smoothly between these positions with reduced force requirements, enhancing operational flexibility and usability.
Implementation Method 1
A biasing member is operatively attached to the housing and biases the friction plate toward the link and the first housing ramp
Implementation Method 2
The friction plate also defines a plate friction surface configured for contact with the link friction surface
Data Source
AI summary
A check system for selective movement between a frame and a door includes a link attached to one of the door and the frame, and a housing attached to the other of the door and the frame. The link defines a link friction surface. The housing defines a tunnel through which the link is selectively movable and a first housing ramp formed at an acute angle relative to the link. A friction plate is disposed within the housing, and defines a first plate ramp slidably engaged with the first housing ramp. The friction plate also defines a plate friction surface configured for contact with the link friction surface. A biasing member is operatively attached to the housing and biases the friction plate toward the link and the first housing ramp.