Linear Hinge With Linkage Arms for Appliance Door Clearance
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Solution Overview
Problem
Existing linear hinges for integrated refrigerator appliances are bulky and allow for hard slamming of doors, leading to interference with adjacent cabinetry.
Innovation Solution
A linear hinge design featuring a bearing, an elongated shaft, and a pair of linkage arms that allow for both rotational and translational movement, with the linkage arms' lengths and orientations selected to ensure the door translates away from the cabinet as it opens, reducing interference and slamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a linear hinge is designed to allow door translation to avoid interference with adjacent cabinetry, then door clearance is improved, but the hinge becomes bulky
Solution Approach 1:
The hinge is divided into separate functional components: a bearing for rotation, an elongated shaft for translation, and linkage arms for coordinating movement. This segmentation allows each component to be optimized independently, reducing overall bulk while maintaining translation capability
Solution Approach 2:
The hinge mechanism transforms pure rotational movement into combined translational and rotational movement by introducing linkage arms that operate in an additional dimensional space, allowing the door to clear cabinetry without requiring a bulky traditional linear hinge design
2Ease of operation
If a linear hinge allows door translation to prevent interference with adjacent cabinetry, then door clearance is improved, but the hinge structure becomes complex
Solution Approach 1:
The linkage arms serve multiple functions simultaneously: they connect the bearing to the shaft, enable translation, control rotation, and prevent slamming. This multi-functionality reduces the need for additional separate components, simplifying the overall structure despite the complex motion requirements
3Ease of operation
If a linear hinge is designed to prevent hard slamming, then door control is improved, but the hinge mechanism becomes more complex
Solution Approach 1:
The hinge uses dynamic linkage arms with specific length ratios that automatically adjust the door's motion characteristics during operation. The linkage geometry changes as the door moves, providing soft-close functionality without requiring separate dampers or complex control mechanisms
Solution Approach 2:
The hinge controls slamming by changing the motion parameters through the linkage mechanism. The specific length ratio between linkage arms (first linkage arm longer than second) transforms the door's rotational velocity into controlled translational and rotational motion, reducing impact forces without additional components
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 minimizes door interference with cabinetry and reduces slamming by allowing smooth translation and rotation, providing a compact and effective solution for door movement.
Implementation Method 1
An elongated shaft is received within the bearing such that the elongated shaft is slidable along a translation axis on the bearing
Implementation Method 2
A distal end portion of the elongated shaft is rotatably connected to the door such that the door is rotatable about a rotation axis that extends through the distal end portion of the elongated shaft
Data Source
AI summary
An appliance includes a linear hinge that couples a door to a cabinet. The linear hinge includes a bearing and an elongated shaft received within the bearing such that the elongated shaft is slidable along a translation axis. A distal end portion of the elongated shaft is rotatably connected to the door such that the door is rotatable about a rotation axis that extends through the distal end portion of the elongated shaft. A first linkage arm is rotatably connected to the bearing. A second linkage arm is rotatably connected to the elongated shaft and to the first linkage arm. The distal end portion of the elongated shaft is spaced from the bearing by a gap along the translation axis when the door is closed, and a sum of a length of the first linkage arm and a length of the second linkage arm is greater than the gap.