Trigger Dispensing Head with Variable Cross-Section Return Element
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Solution Overview
Problem
Mini-trigger dispensers face challenges in manufacturing due to the yielding of the operating spring, leading to malfunctioning, as they are prone to stress under new plastic materials and small dimensions, resulting in inadequate product dispensing.
Innovation Solution
A trigger dispensing head design featuring a frame made of polyolefin materials with a specifically designed return element, comprising elastically deformable arms and a conformational structure that limits stress on the return element, ensuring it does not yield even after repeated use, while maintaining the necessary return action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the operating spring is made from plastic materials to enable recycling, then the recyclability of the dispensing head is improved, but the spring is subject to yielding due to small dimensions and new materials
Solution Approach 1:
The patent changes the geometric parameters of the return element, specifically introducing a variable cross-sectional profile along its length. The cross-section varies from a first value at one end to a second value at the other end, which allows optimization of stress distribution and prevents yielding while maintaining plastic material construction for recyclability
Solution Approach 2:
The return element features non-uniform cross-sectional properties along its length, with different sections having different cross-sectional areas or shapes. This local variation in geometry allows specific regions to have enhanced strength where stress is highest, preventing yielding while keeping the entire element made from recyclable plastic material
2Volume of moving object
If the dimensions of the dispensing head are reduced for mini-trigger applications, then the portability and dosage precision are improved, but the operating spring becomes more prone to yielding
Solution Approach 1:
The patent modifies the geometric parameters of the return element by introducing a variable cross-section that compensates for the overall size reduction. The optimized profile distributes stresses more effectively within the compact dimensions, preventing yielding despite the smaller scale required for mini-trigger applications
Solution Approach 2:
While the entire dispensing head is made from plastic materials for recyclability, the return element incorporates optimized geometric composition with variable cross-section that effectively combines structural efficiency with the constraints of miniaturization, achieving both compact size and resistance to yielding
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 effectively prevents the return element from yielding, ensuring reliable operation and proper dispensing of small doses of products, meeting industry needs for mini-triggers while using recyclable plastic materials.
Implementation Method 1
a return element (70), preferably made in one piece, preferably of plastic material, preferably chosen from the family of polyolefins. The return element (70) comprises a pair of elastically deformable arms (72, 74)
Data Source
AI summary
A trigger dispensing head for a compact dispenser is provided. The trigger dispensing head has a frame, a piston chamber, a piston, a dispensing pipe, a trigger, and a return element having two arms. Each arm of the two arms is arranged in a respective part of a sagittal plane. A lower backing part, supported by the frame, has a main surface. Lower ends of the return element are in contact with the main surface and freely movable thereon.