Handle Lever Toggle Mechanism for Secure Pump Closure
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Solution Overview
Problem
Existing handle lever designs for opening and closing mechanisms, particularly in medical pumps, often fail to ensure safe and complete closure due to restoring forces and increased friction, leading to unintentional opening and potential safety hazards.
Innovation Solution
A device with a handle lever hinged in a rocker-like manner, featuring specific spatial geometry at three articulation points, ensures vibration-proof and position-safe closure by aligning hinges in a way that the second hinge is perpendicular to the line formed by the first and third hinges at the end position, and biased by a spring for secure closure, with a toggle lever effect that prevents incomplete closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a handle lever is used to actuate a locking bolt in a closing mechanism, then the device can be operated manually, but restoring forces and friction may cause the handle to fail to reach the closed position, leading to unintentional opening
Solution Approach 1:
The patent employs a dynamic closing mechanism where the handle lever's rotation is converted into axial movement of a locking bolt through a cam mechanism. The cam's specific geometry ensures that the locking bolt moves in a controlled path, overcoming restoring forces and friction to reliably reach the closed position. The mechanism transitions from a simple lever to a dynamic cam-driven system that maintains complete closure.
Solution Approach 2:
The patent changes the geometric parameters of the cam mechanism to ensure reliable closure. The cam's radius, eccentricity, and profile are designed such that the locking bolt achieves full engagement at a specific rotation angle of the handle. This parameter optimization ensures that even against restoring forces and friction, the handle reaches and maintains the closed position.
2Adaptability or versatility
If additional functions are assigned to the locking mechanism, such as actuating a safety/hose clamp, then the device becomes more versatile, but the risk of incomplete closure increases if the handle lever does not reach the closed position
Solution Approach 1:
The patent merges multiple functions into a single integrated locking mechanism. The handle lever simultaneously actuates both the locking bolt and the safety/hose clamp through the cam mechanism. This consolidation ensures that both functions are performed together, eliminating the risk that one function is completed while the other remains incomplete. The cam's geometry coordinates the movement of both components to achieve simultaneous engagement.
3Device complexity
If the handle lever is designed with a simple pivot mechanism, then the device complexity is reduced, but the ability to prevent unintentional opening is compromised
Solution Approach 1:
The patent transforms a simple pivot mechanism into a dynamic cam-driven system. The cam mechanism provides automatic locking action that prevents unintentional opening without requiring complex additional components. The cam's geometry creates a self-locking effect where the locking bolt and safety clamp remain engaged unless deliberate force is applied to overcome the cam's holding force, thus preventing accidental opening while maintaining reasonable device complexity.
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 device ensures secure and complete closure of the flap or door, reducing the risk of unintentional opening and enhancing safety by utilizing a toggle lever arrangement and spring bias for reliable operation.
Implementation Method 1
biased by a spring for secure closure
Implementation Method 2
a toggle lever effect that prevents incomplete closure
Data Source
Figure 1~3
Figure 4~6
AI summary
An apparatus and a method for opening and closing has a handle, which is attached to a housing in pivotable fashion by means of a handle axis, and a lever joint, which is connected in pivotable fashion to the handle at a lever joint axis and to a slider link at a lever joint axis in each case. The lever joint axis between lever joint and slider link and the handle axis form an imaginary line. In the case of a closed position of the handle, the lever joint axis between lever joint and handle is situated in front of the imaginary line and it is situated therebehind in the case of an opened position of the handle, in which the apparatus releases a bolt.