Pump Dispenser Trigger Play Mechanism for Aiming Accuracy
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Solution Overview
Problem
Conventional trigger-type pump dispensers face issues with operability due to instantaneous pressure application, leading to a hard touch and difficulty in aiming, as the nozzle moves with the piston, affecting the accuracy of liquid spraying.
Innovation Solution
Incorporating a first valve attachment structure with play, featuring a disk-shaped valve and guide pieces, notches, and check pieces, which allows for a time-lagged pressure application, preventing sudden nozzle closure and enhancing trigger movement play.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the trigger is made effective without play in movement to spray liquid immediately, then the spraying response is improved, but the operability deteriorates due to hard touch and instantaneous reactive force
Solution Approach 1:
The patent introduces a trigger play mechanism that provides a cushioning effect before the valve closes. The trigger movement is divided into two stages: first, a play portion where the trigger moves without immediately closing the valve, and second, a closure portion where the valve actually closes. This beforehand cushioning prevents instantaneous reactive force from being transmitted to the user's finger, improving operability while maintaining spraying functionality.
2Device complexity
If the nozzle part moves together with the piston part, then the structure is simplified, but the aiming accuracy deteriorates due to nozzle position change
Solution Approach 1:
The patent segments the trigger movement into distinct functional portions: a play portion and a closure portion. This segmentation allows the trigger to move independently in the play portion without moving the nozzle, and only moves the nozzle in the closure portion when liquid discharge is actually needed. This resolves the contradiction by separating the aiming function (nozzle position) from the trigger operation.
3Speed
If the trigger movement directly closes the valve, then the response time is reduced, but the soft touch effect is lost due to instantaneous reactive force
Solution Approach 1:
The patent implements beforehand cushioning by designing the trigger structure to include a play portion that absorbs the initial movement. During this play portion, the valve remains open and no reactive force is generated. Only after the trigger completes the play portion does the valve begin to close, at which point the liquid has already started flowing and reactive force is minimized. This maintains both fast response and soft touch.
Solution Approach 2:
The patent applies preliminary action by ensuring that liquid begins to flow through the nozzle during the trigger's play portion, before the valve fully closes. This preliminary liquid flow reduces the pressure buildup and reactive force that would otherwise occur when the valve suddenly closes, thereby maintaining soft touch while preserving rapid response.
Data Source
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Figure 3(A)~3(B)
AI summary
[Object] To provide a pump dispenser which allows accurate determination of a direction of spraying of liquid without a nozzle part moving toward a higher or lower position and, furthermore, whose trigger is excellent in operability. [Solution] The present invention is directed to an F valve attachment structure for, in a pump dispenser that causes a piston part to slide to apply pressure to liquid inside a cylinder part including an F valve and causes the liquid to squirt out from a nozzle part via an S valve, attaching the F valve to the inside of the cylinder part with use of a valve stopper, the F valve including: a valve body part; and a rod-like part extending upward from the valve body part, wherein the valve body part has a plurality of guide pieces and check pieces therearound, the valve stopper has a hole and notches in a ceiling part of the valve stopper, the notches allowing the guide pieces to pass through the notches, the valve stopper is fixable inside the cylinder part, when the valve body part of the F valve is inserted through the hole of the valve stopper, the check pieces are allowed to elastically pass through the hole, and after insertion, the check pieces of the F valve come into contact with the ceiling part of the valve stopper to be retained.