Refrigerator Door Cam Closure for Quiet French Door Sealing
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Solution Overview
Problem
Existing door closure systems for refrigerators, particularly gravity-operated systems, are ineffective for modern designs, can cause noise, and fail to ensure proper closure of French doors, necessitating a cost-effective and efficient solution.
Innovation Solution
A door closure mechanism featuring a spring-biased cam system with a lobed edge that induces a door-closing torque through a follower mechanism, ensuring the door is properly closed without excessive force, suitable for various appliance designs including French doors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gravity operated door closing systems are used, then the door can close automatically without user effort, but the door closes with excessive force causing noise and disturbing contents
Solution Approach 1:
The cam mechanism transforms the static gravity force into a dynamic closing action. The lobed cam profile controls the follower's movement, creating a progressive closing torque that starts strong to overcome friction and ends gentle to avoid noise and disturbance, making the closing force adaptive throughout the motion range.
Solution Approach 2:
The cam profile geometry is specifically designed to vary the closing torque parameter throughout the door's motion. The lobed edge creates a non-linear torque curve that changes from high initial torque to low final torque, allowing the same mechanism to provide both automatic closure and gentle stopping.
2Ease of operation
If gravity operated door closing systems are used, then automatic closure is achieved, but proper closing cannot be ensured for French doors with vertical seam engagement
Solution Approach 1:
The cam mechanism provides controlled dynamic movement that can precisely position the door at the closed position. The lobed cam profile ensures the follower reaches a specific engagement point that aligns the vertical seam sealing mechanism, providing reliable closure for French doors regardless of initial door position or gravity variations.
3Object-affected harmful factors
If cam mechanism with spring-biased follower is used, then controlled door closure torque is achieved, but device complexity increases
Solution Approach 1:
The mechanism merges the spring-loaded follower assembly with the cam structure into an integrated unit. The follower is mounted on the spring rod that is already part of the cam assembly, combining multiple functions (spring loading, follower motion, cam rotation) into a single compact mechanism that minimizes overall complexity.
Solution Approach 2:
The cam mechanism serves multiple functions simultaneously: it provides the closing torque, controls the closing speed, positions the door at the closed position, and engages the vertical seam sealing mechanism. This multi-functionality reduces the need for separate mechanisms for each function, offsetting the inherent complexity of the cam structure.
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 mechanism ensures reliable and quiet door closure with minimal user effort, suitable for modern appliance designs, effectively addressing the limitations of existing systems.
Implementation Method 1
A spring biases the spring rod to an extended position
Implementation Method 2
the spring induces a door-closing torque on the body when the follower is engaged with the closing portion of the cam lobed edge
Data Source
AI summary
A door closure device includes a pivot pin adapted to engage an associated appliance hinge, and a channel rotatably connected to the pivot pin and adapted to be connected to an associated appliance door. A cam is non-rotatably engaged with the pivot pin. The cam comprises a lobed edge including a closing portion. A spring rod is slidably engaged with the channel, and a cam follower is operably engaged with the spring rod. A spring is engaged between the spring rod and the channel and biases the cam follower into engagement with the lobed edge of the cam. The follower moves along the lobed edge of the cam when the channel is rotated relative to the cam and the spring induces a door-closing torque on the channel when the follower is engaged with the closing portion of the cam lobed edge.