Self-Closing Hinge Spring Around Cams for Freezer Doors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing self-closing door hinges for walk-in freezers face challenges in providing adequate closing force due to lightweight doors and airtight environments, leading to incomplete latching and reduced seal effectiveness, with current designs being bulky, aesthetically unpleasing, and lacking adjustable spring options.
Innovation Solution
A self-closing hinge design with a spring system placed around the cams, allowing for a compact, reversible, and aesthetically pleasing structure with adjustable spring options, reducing height while maintaining functionality and concealing fasteners, enabling efficient door closure without raising the door threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring-bias feature is added to assist door closure in lightweight freezer doors, then the door closing reliability is improved, but the hinge structure becomes more complex and bulkier
Solution Approach 1:
The patent combines the spring-bias mechanism with the cam-based gravity-assist feature into a single integrated hinge structure. The spring is positioned to work in conjunction with the cam surfaces, allowing both spring-assisted closure and gravity-assist door raising to occur through the interaction of unified components rather than separate mechanisms.
Solution Approach 2:
The spring mechanism is nested within the cam structure, with the spring positioned inside the cam housing and integrated with the cam surfaces. This nesting allows the spring-bias feature to be incorporated without significantly increasing the overall hinge volume or structural complexity.
2Reliability
If the spring is positioned above or below the cams to provide closing force, then the door can be reliably closed, but the overall height of the hinge increases substantially
Solution Approach 1:
Instead of positioning the spring vertically above or below the cams (increasing height in one dimension), the patent positions the spring concentrically around the cam shaft, utilizing the radial dimension. This dimensional change allows the spring to provide closing force without substantially increasing the hinge's overall height.
Solution Approach 2:
The spring is nested within the cam housing structure, with the cam surfaces positioned radially outward from the spring. This nesting arrangement allows the spring to be contained within the existing hinge footprint, maintaining a compact overall height while still providing the necessary closing force.
3Object-affected harmful factors
If a cam-based gravity-assist feature is used to raise the door during opening, then the door seal is protected from scraping, but the hinge structure becomes more complex
Solution Approach 1:
The cam-based gravity-assist feature is merged with the spring-bias mechanism into a single integrated system. The cam surfaces work in conjunction with the spring to provide both door raising during opening and closing force, eliminating the need for separate mechanisms and reducing overall structural complexity.
4Shape
If the hinge is designed to be compact with spring around cams, then the aesthetic appearance and space efficiency are improved, but the manufacturing complexity increases
Solution Approach 1:
The hinge is divided into modular segments including a cam housing, spring assembly, and mounting components. This segmentation allows the compact design with spring around cams to be manufactured using standard machining and assembly processes, reducing the manufacturing complexity despite the innovative configuration.
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 provides a reliable, aesthetically improved, and space-efficient self-closing mechanism that ensures proper latching of lightweight freezer doors while maintaining the integrity of the door seal, offering adjustable spring force without increasing the hinge's overall height or visibility of fasteners.
Implementation Method 1
a spring-bias that urges the door closed
Implementation Method 2
move the spring into a position of potential energy that, when the door is released, works to close the door
Implementation Method 3
when gravity pulls the door and its hinge portion downward relative to the stationary hinge portion and surrounding stationary structure
Data Source
AI summary
A compact and aesthetically-pleasing self-closing door hinge comprises a gravity-assist feature and preferably a spring-assist feature, wherein the spring may be easily adjustable, replaceable, and even left out of the hinge. The preferred embodiment is reversible for easily changing from a right-opening to a left-opening door, and includes hinge lift-off capability, wherein the door and the blade connecting the door to the hinge body may be lifted up off the body of the hinge without any significant disassembly of the hinge. The spring is preferably placed around the gravity-assist cams of the hinge, rather than above or below the cams, which arrangement significantly reduces the overall height of the hinge with only slightly increased diameter of the hinge main body. The preferred hinge has no bolts or other fasteners visible or protruding out from the main housing of the hinge, and the preferred hinge has no exposed spring sleeve.