Syringe Plunger Elastic Locking Mechanism
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Solution Overview
Problem
Conventional syringe dispensers struggle to divide the content medium into smaller fractions and improve operability, as seen in the configuration of the plunger with two shafts in existing technologies.
Innovation Solution
A syringe dispenser design featuring a plunger with a first shaft member and a second shaft member, where the first shaft member includes elastic pieces with slide and lock projections for precise control, and the second shaft member has a pressing shaft with an engagement projection to prevent slipping, allowing for flexible deformation and controlled dispensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the plunger is configured by two shafts to enable stepwise dispensing, then the ability to divide content medium into smaller fractions is improved, but the operability and coordination between shafts deteriorates
Solution Approach 1:
The patent merges the two shaft members into a unified plunger structure where the first shaft member (with piston) and second shaft member (pressing shaft) are integrally connected. This integration ensures automatic coordination between the shafts during operation, eliminating the operability issues that arise from separate shafts while maintaining the stepwise dispensing capability through the elastic piece mechanism.
Solution Approach 2:
The second shaft member (pressing shaft) is nested within the first shaft member, with the pressing shaft fitted into the tubular portion of the first shaft member. This nested configuration allows compact arrangement while maintaining the functional independence of each shaft member, enabling stepwise dispensing through the elastic piece's deformation and restoration while improving operational coordination.
2Ease of operation
If the elastic piece is made flexible to enable locking and unlocking, then the stepwise dispensing control is improved, but the structural stability deteriorates
Solution Approach 1:
The elastic piece is designed with localized flexibility at specific regions (such as the pressing portion and deformation regions) while maintaining overall structural integrity. The thinned portion creates a specific flexible zone that allows locking/unlocking motion without compromising the strength and stability of the entire plunger structure. This local quality approach enables controlled deformation while preserving structural stability.
Solution Approach 2:
The elastic piece is constructed as a composite structure combining regions of different thickness and flexibility. The thinned portion creates a flexible zone for locking/unlocking, while thicker portions maintain structural strength. This composite design allows the elastic piece to exhibit both flexibility for operation and stability for structural support simultaneously.
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 precise division of the content medium into smaller fractions and enhances operability by allowing for one-hand operation and reliable metered dispensing, improving user control and efficiency.
Implementation Method 1
the elastic piece undergoes a flexure deformation starting from the slide projection, and thus, the lock projection is locked against the rear end of the syringe, and in response to the pressing being released, the locking of the lock projection is released due to a restoring force from the flexure deformation
Data Source
AI summary
The syringe dispenser includes a syringe and a plunger. The plunger includes a first shaft member including a piston and second shaft member configured to be fitted in a tubular portion of the first shaft member. The first shaft member includes an elastic piece, the elastic piece being provided with a slide projection configured to slide on an inner surface of the syringe and a lock projection configured to be locked against the syringe. The second shaft member includes a pressing shaft configured to be fitted in the tubular portion. The pressing shaft is provided in a front end thereof with an end surface configured to press a free end of the elastic piece. In response to pressing from the end surface, the lock projection is locked against the rear end of the syringe, and in response to the pressing being released, the locking of the lock projection is released.