External-Spring Plunger Assembly for Low-Marking Installation
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Solution Overview
Problem
Existing spring plunger assemblies have a low life cycle, require special tools for installation, and can mark the material they are pushing against due to their small contact surface area.
Innovation Solution
A spring plunger assembly with a plunger body, retainer body, and spring member, featuring a hexagonal exterior surface and flared section, which provides a larger contact surface area and reduces material indenting, while also being easier to install and having a longer life cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional spring plunger with a small contact surface is used, then the structure is simple and easy to manufacture, but it causes material indenting and marking due to concentrated pressure
Solution Approach 1:
The plunger body is segmented into multiple width zones (first width at outer end, second width at medial portion, third width at inner end) creating distinct shoulders. This segmentation distributes the contact pressure across multiple surface areas, preventing material indenting while maintaining structural integrity.
Solution Approach 2:
The plunger body transitions from a simple cylindrical form to a multi-dimensional structure with varying widths along its length. The first shoulder (between outer end and medial portion) and second shoulder (between inner end and medial portion) create additional contact surfaces in different dimensions, spreading the load and eliminating concentrated pressure points.
2Reliability
If a conventional spring plunger is used, then the installation process is simple, but it requires special tools and has a low life cycle
Solution Approach 1:
The inner end portion features an asymmetric hexagonal exterior surface that engages with a corresponding hexagonal opening in the retainer body. This asymmetric geometry provides inherent installation orientation and mechanical advantage, allowing standard hex keys to be used instead of special tools, while the hexagonal structure also strengthens the assembly against rotational stresses during operation.
Solution Approach 2:
The hexagonal interface between the plunger body and retainer body creates a self-aligning, self-locking mechanism. The hexagonal exterior surface of the plunger body fits into the hexagonal opening of the retainer body, providing automatic orientation and secure engagement without requiring additional alignment tools or complex installation procedures.
3Object-affected harmful factors
If a conventional spring plunger with a small contact area is used, then the device complexity is low, but it marks the material being pushed against
Solution Approach 1:
Different sections of the plunger body have different local qualities in terms of width and contact surface area. The outer end portion has a first width providing a larger contact area to prevent marking, while the inner end portion has a third width optimized for retention. The medial portion with the second width creates transition zones (shoulders) that distribute pressure locally across multiple areas, preventing concentrated stress marks on the material.
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 spring plunger assembly achieves a longer life cycle, reduces material indenting, and simplifies installation by providing a larger contact surface area and utilizing a hexagonal and flared design, while maintaining operational effectiveness.
Implementation Method 1
a spring member with an outer end that contacts the first shoulder of the plunger body and an inner end that contacts the outer end portion of the retainer body
Data Source
AI summary
A spring plunger assembly can be used in manufacturing, machines, fixtures, etc. The spring plunger assembly has a spring that is located on the exterior of the plunger body. The spring plunger assembly includes a threaded section for engaging a threaded aperture.