Trigger Pump Dispenser Handle Geometry for Ergonomic Operation
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Solution Overview
Problem
Trigger-type pump dispensers are difficult for children with small hands and individuals with weaker grip or lower finger pressure to operate, as they require gripping the entire trigger, which can lead to soiling and inefficient pressure transmission, and there is a need for improved ergonomics.
Innovation Solution
A trigger-type pump dispenser design where the handle is positioned below the trigger, allowing it to be gripped with four fingers and depressed by the thumb, with a finger contact portion inclined 3-10 degrees and spaced 35-45 mm from the trigger, facilitating efficient finger pressure transmission and reducing soiling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the trigger is gripped with four fingers to operate the pump dispenser, then the trigger can be actuated, but it becomes difficult for children with small hands and disabled people with weaker grip to operate efficiently
Solution Approach 1:
The pump dispenser is divided into two separate gripping zones: a trigger section for finger actuation and a handle section for palm support. This segmentation allows different parts of the hand to perform different functions, making it accessible to users with varying hand sizes and grip strengths.
Solution Approach 2:
The handle section acts as an intermediary element between the user's hand and the trigger mechanism. By providing a separate handle for palm gripping, it mediates the interaction, allowing users with weaker grips to stabilize the device without requiring strong finger pressure on the trigger alone.
2Ease of operation
If the entire periphery of the pump dispenser is gripped with the palm and fingers to operate the trigger, then the trigger can be squeezed, but the hand may be soiled with liquid chemical adhering to the periphery
Solution Approach 1:
By separating the trigger section from the handle section, the design allows users to grip the handle with the palm while actuating the trigger with fingers. This segmentation creates a clean separation between the gripping zone and the actuation zone, preventing contact with liquid chemicals on the pump dispenser body.
Solution Approach 2:
The handle section is extracted as a separate functional element from the main pump dispenser body. This extraction allows the palm to grip a dedicated handle rather than the entire periphery, removing the hand from contact zones where liquid chemicals may adhere.
3Device complexity
If the finger contact portion is positioned anterior to the point of force of the trigger, then the structure is compact, but the transmission of finger pressure to the trigger section is inefficient
Solution Approach 1:
The finger contact portion is positioned in a different spatial dimension relative to the trigger's point of force, specifically posterior to it along the longitudinal axis. This dimensional arrangement creates an optimal lever arm for force transmission, allowing efficient pressure transfer from fingers to the trigger mechanism while maintaining structural compactness.
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 design enhances operability, making the pump dispenser easier to use for diverse hand sizes, prevents soiling, and allows efficient liquid ejection with reduced strain on the user's fingers.
Implementation Method 1
moving the piston applies pressure into the cylinder to cause the liquid to be sprayed
Implementation Method 2
Gripping the lever by hand and moving it toward a near side causes the piston, which is disposed in a horizontal direction, to move in tandem with the lever
Data Source
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AI summary
[Object] To provide a trigger-type pump dispenser (A) which is configured such that a trigger section (13) is depressed by a thumb with a handle gripped, which is good in grippability, which allows efficient transmission of finger pressure to the trigger section (13) during spraying, and which is excellent in operation. [Solution] The present invention is directed to a trigger-type pump dispenser including: a cylinder section; a handle section (12); a trigger section (13) located above the handle section (12); and a nozzle section (4) from which liquid is sprayed out of the cylinder section by depressing the trigger section (13) with the handle section (12) gripped, wherein the handle section (12) has a finger contact portion (S) located posterior to a point of force of the trigger section (13).