Trigger Pump Dispenser With Inverted-L Grip And Hollow Piston
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Solution Overview
Problem
Conventional trigger-type pump dispensers are difficult for individuals with small hands or reduced grip power to operate effectively, as they require a full palm grip and can lead to soiling, and they often have operational issues with nozzle position stability during liquid injection.
Innovation Solution
A trigger-type pump dispenser design featuring a hollow-shaped piston shaft and an inverted-L-shaped grip with a stopper, allowing for efficient finger power transmission and maintaining nozzle position stability during liquid injection, with the grip positioned under the trigger to facilitate easy handling and prevent soiling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the trigger is positioned at the front and requires full palm grip, then the liquid injection force can be sufficient, but individuals with small hands or reduced grip power cannot operate it effectively
Solution Approach 1:
The trigger is repositioned from the front to the top of the dispenser, changing the spatial dimension of operation. This allows users to press down vertically with finger strength rather than requiring lateral palm grip, making it accessible to individuals with small hands or reduced grip power while still achieving sufficient injection force through the vertical pressing motion
Solution Approach 2:
A pressing surface is introduced as an intermediary between the user's finger and the trigger mechanism. This enlarged pressing surface area distributes the applied force and provides a better grip interface, allowing efficient force transmission even with limited finger strength, thereby resolving the contradiction between ease of operation and injection force
2Force
If the whole dispenser is gripped to operate the trigger, then sufficient force can be applied, but liquid affixed to the main body causes soiling of the hand
Solution Approach 1:
The gripping function is extracted from the main body of the dispenser and separated into a dedicated grip portion. This allows users to hold only the clean grip area while operating the trigger, preventing contact with and soiling from liquid on the main body surface
Solution Approach 2:
The dispenser is segmented into distinct functional areas: a grip portion for hand contact, a trigger mechanism for operation, and a main body for liquid containment. This segmentation allows the grip portion to be positioned and designed independently, ensuring it remains clean during operation while still providing sufficient gripping force
3Ease of operation
If the trigger is positioned above the main body and pressed down, then grip capability is improved, but the piston structure requires extra space in the housing
Solution Approach 1:
The piston rod is nested within the piston, and the pressing surface is integrated into the trigger assembly. This nesting and integration approach minimizes the space required in the housing while maintaining the top-positioned trigger design for improved grip capability
Solution Approach 2:
The piston rod is designed to move dynamically within the piston cavity, allowing compact packaging of the piston structure. The pressing surface and trigger mechanism are configured to utilize vertical space efficiently, reducing the horizontal footprint and overall housing volume required
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 enables accurate liquid injection direction without nozzle movement, improved grip capability, efficient power transmission, and reduced soiling, making it usable by individuals with limited hand strength or dexterity.
Implementation Method 1
a spring which presses the hollow-shaped piston and the hollow-shaped piston shaft upward
Implementation Method 2
a trigger positioned above the housing, having a front tip rotatably mounted on the housing... a center part of the trigger abuts on an upper part of the piston shaft
Implementation Method 3
With the piston being moved, a pressure is applied to the inside of the cylinder to cause a liquid to be injected
Data Source
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AI summary
To provide a trigger-type pump dispenser capable of accurately defining a liquid injecting direction without vertical movement of the position of a nozzle part, having a good grip capability without soiling of hands, having efficient transmission of finger power to a trigger part at the time of injection, and being excellent in operability. The present invention includes a housing 11 with a front cylinder part 11A and a rear inverted-L-shaped grip part 11B integrally formed, a nozzle base 12 attached to the housing 11 and having a front nozzle part 11C mounted thereon, a piston structure configured of a hollow-shaped piston 15 and a hollow-shaped piston shaft 16 and sliding inside the cylinder part, a spring 17 which presses the piston structure 14 upward, a trigger 13 positioned above the housing 11, having a front tip rotatably mounted on the housing 11, and having a mid part where a tip of the hollow-shaped piston shaft 16 abuts, and a valve rod 18 disposed at a center part of the cylinder part 11A.