Appliance Door Hinge with Threaded Preload Adjustment
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Solution Overview
Problem
Existing hinges for domestic appliance doors require complex adjustments of elastic elements to balance varying door weights, leading to increased production costs and assembly complexity.
Innovation Solution
A hinge design featuring a helical spring and a flat control rod with a threaded portion, allowing for adjustable preloading by screwing a nut along the threaded portion, thereby simplifying the balancing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex means for adjusting preloading are used to adapt to different door weights, then the hinge can balance doors of varying weights, but the device complexity and production costs increase
Solution Approach 1:
The hinge employs a dynamic preloading adjustment mechanism where the elastic element's preloading can be modified after assembly. A threaded rod with adjustable nut allows the distance between spring anchors to be changed, enabling the same hinge to adapt to different door weights without redesigning the entire structure.
Solution Approach 2:
The invention changes the physical parameter of spring preloading force by adjusting the axial distance between spring anchors. By modifying this geometric parameter through the threaded adjustment mechanism, the hinge can compensate for varying door weights while maintaining structural simplicity.
2Adaptability or versatility
If complex means for adjusting preloading are used to adapt to different door weights, then the hinge can balance doors of varying weights, but the assembly complexity increases
Solution Approach 1:
The adjustment mechanism is designed to be dynamically configurable during assembly. The threaded rod and nut allow installers to adjust spring preloading in situ, eliminating the need for complex pre-calibration procedures or specialized assembly equipment.
Solution Approach 2:
The hinge enables end-users or installers to perform their own adjustment of the spring preloading using simple hand tools. The self-contained adjustment mechanism with clear indication features allows users to independently adapt the hinge to their specific door weight requirements without factory intervention.
3Adaptability or versatility
If elastic elements are replaced to balance different door weights, then effective balance can be achieved for each door, but the productivity and assembly efficiency decrease
Solution Approach 1:
Instead of replacing entire elastic elements, the invention allows adjustment of the spring preloading parameter by changing the anchor distance. This single-parameter adjustment achieves the same balancing effect as replacing springs but is far more efficient and faster to implement.
Solution Approach 2:
The hinge design creates a universal solution that can accommodate multiple door weight categories using the same elastic element. The adjustable preloading mechanism allows one hinge unit to serve multiple functions across different applications, eliminating the need for inventory management of multiple spring types.
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 hinge effectively balances doors of varying weights with a simple and cost-effective adjustment mechanism, reducing production costs and assembly complexity while maintaining stability and functionality.
Implementation Method 1
a helical spring (7) connected to said arm (5) and generating, with a relative deformation, an elastic reaction force compensating at least partly for the weight force of the door during its opening or closing
Implementation Method 2
a flat control rod (8) supported by said second element (3), having a threaded portion (F), and a nut (11) engaging by screwing on said threaded portion (F), with which it is possible to vary the compression of the helical spring (7) and, consequently, to vary its preloading
Data Source
AI summary
Described is a hinge for doors of electrical household appliances, comprising a first element and a second element pivoted to each other and movable relative to each other in a tilting fashion, the first and second elements being fixable one to a frame and the other to a door of an electrical household appliance, for making the door movable with respect to the frame between a closed position and an open position, an arm for connection between the first and the second elements, a helical spring connected to the arm and designed to generate with its own deformation a force of elastic reaction designed to compensate at least partially the weight force of the door during the opening or closing of the door, means for adjusting the intensity of the elastic reaction force.