Adjustable-Torque Hinge Mechanism for Variable Door Weights
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Solution Overview
Problem
Conventional oven door hinges require separate production and replacement for different door weights, leading to incompatibilities, production issues, and user difficulties in maintaining the door at specific angles due to fixed spring forces, which cannot be adjusted after manufacture.
Innovation Solution
A hinge mechanism that allows adjustment of the spring force by a movable pin system enabling back-and-forth and up-and-down movement, allowing the nominal size of the spring to be changed, thus accommodating doors of varying weights without the need for replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring force in the hinge is increased to support heavier doors, then the door can be held at desired angles, but heavier doors become difficult to open and close
Solution Approach 1:
The hinge mechanism incorporates a movable pin that can be adjusted to different positions along the cam profile, dynamically changing the spring force output to match different door weights. This allows the same hinge to adapt to varying door weights without requiring multiple fixed-force spring assemblies.
Solution Approach 2:
The invention changes the operational parameters of the spring by adjusting the pin position, which modifies the effective spring force applied to the door. By moving the pin along the cam, the spring's mechanical advantage and output force are varied to suit different door weights, resolving the contradiction between holding force and ease of operation.
2Reliability
If separate hinges are produced for different door weights, then compatibility and proper door control are achieved, but production complexity and inventory requirements increase
Solution Approach 1:
The hinge is designed with a universal adjustment mechanism that allows a single hinge model to serve multiple door weight categories. The movable pin system enables the same hinge body to be configured for light, medium, and heavy doors, eliminating the need for multiple specialized hinge variants.
Solution Approach 2:
The hinge mechanism is segmented into adjustable components, particularly the pin position along the cam profile. This segmentation allows independent adjustment of the spring force parameter while keeping the main hinge structure standardized, simplifying production and inventory management.
3Productivity
If the spring force is fixed during manufacture, then production efficiency is maintained, but the hinge cannot be adjusted after production for different door weights
Solution Approach 1:
The hinge incorporates a dynamic adjustment feature where the pin can be repositioned after manufacture. This maintains production efficiency by using standardized hinge bodies while adding post-production adaptability through simple pin repositioning, eliminating the need for complex pre-adjustment procedures.
4Reliability
If a heavier spring is used to support heavier doors, then the door can be held steady, but users experience difficulty in opening and closing the door
Solution Approach 1:
The invention changes the spring force parameter by adjusting the pin position on the cam profile. For heavier doors, the pin is positioned to increase spring force for better holding capability. For lighter doors, the pin is repositioned to reduce spring force, making operation easier. This parameter adjustment resolves the contradiction between holding capability and operation ease.
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
Enables continuous manufacturing and mounting of hinges on ovens of different sizes and weights, ensuring the door remains fixed at desired angles by adjusting the spring force, reducing production and ergonomic challenges, and eliminating the need for separate hinges for each door weight.
Implementation Method 1
a compression spring (16) which allows balanced back-and-forth movement of the adjustment pin (13)
Implementation Method 2
a spring (17) smaller than the compression spring (16) which enables balanced up-and-down movement of the adjustment pin (13)
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to a mechanism for adjusting the torques of doors of different weights during door opening and closing operations. The invention particularly relates to a mechanism added to doors of different weights, which allows, by means of a movable pin, adjustment of the torque of a hinge in accordance with the weight of the door, without the need for replacement of the whole the door or the hinge.