Door Lever Safety Device with Radial Projections
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Solution Overview
Problem
Existing devices fail to effectively prevent access to doors with lever handles, as they either hinder movement without fully blocking access or require removal to function, and existing solutions are cumbersome and inefficient.
Innovation Solution
A device with moveable projections that can be secured to a door, allowing independent radial movement to block upward or downward lever movement, featuring buttons to control the projections' position and prevent door opening, while allowing easy access when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed lever is positioned above the door lever to prevent upward movement, then the door lever cannot be moved upward, but the fixed lever makes it difficult to grasp and move the door lever downward
Solution Approach 1:
The first lever is made movable between a first position (extending perpendicular to the door lever) to block upward movement, and a second position (retracted) to permit downward movement. This dynamic adjustment resolves the contradiction by allowing the lever to adapt its function based on the required operation direction.
Solution Approach 2:
The device divides the blocking function into two separate levers: the first lever specifically blocks upward movement, while the second lever specifically blocks downward movement. This segmentation allows each lever to be optimized for its specific function without interfering with the other direction of movement.
2Reliability
If a second lever is positioned below the door lever to prevent downward movement, then the door lever cannot be moved downward, but the second lever remains in the path of movement and hinders grasping and moving the door lever
Solution Approach 1:
The second lever is made movable between a third position (extending perpendicular to the door lever) to block downward movement, and a fourth position (retracted) to permit downward movement. This dynamic retraction capability allows the second lever to clear the path of movement when downward access is required.
Solution Approach 2:
The blocking function is segmented into two independent levers positioned at different locations (above and below the door lever), each controlled by separate buttons. This allows independent control of upward and downward blocking functions.
3Reliability
If the first lever is positioned right above the door lever to prevent upward movement, then the door lever cannot be moved upward, but it becomes difficult to grasp and move the door lever downward
Solution Approach 1:
The first lever can be dynamically retracted from its blocking position (extending perpendicular) to a retracted position, clearing the area above the door lever. This allows unobstructed access to grasp and move the door lever downward when needed.
Data Source
AI summary
A device preventing movement of a lever in an upward and downward direction is disclosed. The device has a first projection and a second projection that are moveable radially to a first position that prevents movement of the lever, and to a second position that permits movement of the lever. The first projection and the second projection may be moved independently by engaging respective buttons on the first projection and the second projection. The device has many uses, included as a safety device to prevent children or others from moving a door lever to open a door.