Pull-closed device for a movably mounted furniture part
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Solution Overview
Problem
Existing closing devices for furniture parts struggle to provide a high closing force while allowing easy opening, particularly in applications requiring reliable sealing across different climates or temperatures.
Innovation Solution
A closing device with a carrier and closing lever system where the distance between the carrier's start-of-operation position and pivot axis is at least 1.5 times greater than in the closed position, combined with a curved guide track and a closing spring with increased tension, allows for a high closing force while maintaining ease of opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the closing lever arm is shortened to reduce opening force, then ease of opening is improved, but closing force is reduced
Solution Approach 1:
The closing lever arm length is made variable through the guide track mechanism. The carrier travels along a curved guide track that dynamically adjusts the effective lever arm length: longer when opening (for ease of operation) and shorter when closing (for high closing force). This dynamic adjustment resolves the contradiction between ease of opening and closing force.
Solution Approach 2:
The patent changes the geometric parameter of the lever arm length during operation. By designing the guide track with specific curvature, the distance between the carrier and pivot axis changes from a larger value during opening to a smaller value during closing, thereby changing the mechanical advantage parameter to satisfy both requirements.
2Reliability
If the closing spring tension is increased to improve closing force, then sealing reliability is improved, but opening difficulty increases
Solution Approach 1:
The guide track mechanism dynamically adjusts the lever arm length to counterbalance the high spring tension. During opening, the longer lever arm provides mechanical advantage to overcome the high spring force. During closing, the shorter lever arm allows the high spring force to generate sufficient closing force for sealing, thus resolving the contradiction.
Solution Approach 2:
The curved guide track geometry is specifically designed to create the varying lever arm effect. The curvature of the guide track path causes the carrier to move in an arc that naturally adjusts the moment arm length, enabling the system to handle high spring tension while maintaining ease of opening.
3Ease of operation
If the carrier distance from pivot axis is increased to reduce opening force, then ease of opening is improved, but closing force is reduced
Solution Approach 1:
The carrier's distance from the pivot axis is made dynamic through the guide track constraint. The carrier is allowed to move along a curved path that positions it farther from the pivot during opening (reducing required opening force) and closer to the pivot during closing (increasing closing force). This dynamic positioning resolves the contradiction.
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
This configuration enables a strong closing force for sealing while minimizing the force required to pivot the closing lever, ensuring reliable sealing and easy opening, even in applications with different internal climates.
Implementation Method 1
a closing spring (17) which acts on the closing lever (15) with a closing force
Implementation Method 2
a closing lever (15) which is acted upon by a closing spring (17) and comprises a guide track (18) for the carrier (8) and is pivotable by the carrier (8) when the movable furniture part is opened
Data Source
AI summary
A closing device for a furniture part having a carrier connected to the movable furniture part or the body part, and a closing lever which is impinged upon by a closing spring, the closing lever having a guide track for the carrier and being pivotable by the carrier when the movable furniture part is opened between a hold-closed position and a standby position, in which the carrier uncouples from the closing lever or which is stationary with respect to the movable furniture part for the carrier connected to the body part. A closing force is exerted by the closing lever onto the carrier as of a use position assumed by the carrier in the guide track. The distance of the carrier in the use position from the lever pivoting axis of the is at least 1.5 times the distance of the carrier in the closed position from the pivoting axis.