Furniture Ejector Locking Path for Overpress Closure Security
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Solution Overview
Problem
Existing drive devices for furniture parts, such as drawers, fail to securely lock when pushed excessively firmly, leading to potential unlocking and loss of closure security due to incorrect operation.
Innovation Solution
A locking device with a pre-locking portion and a cardioid-shaped guide path that includes a through-pressing evasion portion, preventing immediate unlocking by holding the locking element in the pre-locking portion until the ejection force is fully loaded, and featuring a holding element like a straight contact surface or damping gear to control the movement into the locking portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the locking element is held in the pre-locking portion with a holding element, then the reliability of closure is improved, but the device complexity increases due to additional guide path portions and holding elements
Solution Approach 1:
The locking mechanism is segmented into distinct functional portions: a pre-locking portion and a locking portion. The locking element transitions through these separated zones, allowing the holding element to secure the element in the pre-locking portion before final engagement with the locking portion, thereby ensuring reliable closure while maintaining a manageable structural division.
Solution Approach 2:
The holding element performs a preliminary locking action by securing the locking element in the pre-locking portion before the drawer is fully closed. This preliminary engagement ensures the drawer remains securely closed during the closing operation, and only releases when the locking element is properly positioned in the locking portion after full closure, preventing premature unlocking.
2Ease of operation
If the locking element passes directly from the pre-locking portion to the locking portion, then the ease of operation is improved, but the reliability deteriorates due to potential direct triggering during through-pressing
Solution Approach 1:
The holding element acts as an intermediary mechanism between the pre-locking portion and the locking portion. It temporarily secures the locking element in the pre-locking portion, creating a controlled transition state that prevents direct triggering during through-pressing operations while still allowing smooth normal closing when the drawer is properly positioned.
3Reliability
If the guide path is designed with a cardioid shape and multiple portions, then the reliability of preventing incorrect operation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The guide path is designed with a cardioid (heart-shaped) curved geometry that naturally guides the locking element through the pre-locking portion and locking portion. This curved path ensures reliable engagement sequences and prevents direct triggering during through-pressing operations. The specific curvature and shape are optimized to provide the necessary mechanical guidance while maintaining manufacturability through standard machining processes.
Data Source
AI summary
A drive device for a movable furniture part includes an ejecting element for moving the movable furniture part from a closed position to an open position, an ejection force accumulator that applies force to the ejecting element, and a locking device for locking the ejecting element by a locking element in a locking section. The locking device can be unlocked by overpressing the movable furniture part from the closed position to an overpressing position in the closing direction. The movable furniture part can be moved in the opening direction by the ejection force accumulator and the ejecting element, and the locking device has a pre-locking section for the locking element. The locking element is moved from the pre-locking section into the locking section via a push-through evasion section by pushing the movable furniture part during closing into a push-through position behind the closing position in the closing direction.