Shelf Groove Locking System to Prevent Accidental Vertical Removal
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Solution Overview
Problem
Existing shelf locking systems for furniture are prone to accidental removal due to reliance solely on the shelf's weight for fixation, lacking effective mechanisms to prevent vertical lifting.
Innovation Solution
A shelf design featuring a surface groove with a channel configuration that includes a first segment orthogonal to the support surface and a second angled segment, combined with an undercut and a blocking element, ensures the fixed element is securely locked in place, preventing vertical displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shelf is fixed to the furniture wall using only a plug and recess connection, then the assembly is simple and economical, but the shelf can be accidentally raised due to lack of anti-lifting mechanism
Solution Approach 1:
The invention introduces a vertical dimension to the fixation mechanism by creating a groove that extends from the horizontal shelf surface down into the shelf thickness. This vertical component (first segment) prevents the plug from being removed vertically, while the horizontal component (second segment) allows easy insertion. This dimensional transformation resolves the contradiction by adding anti-lifting capability without significantly complicating the assembly process.
Solution Approach 2:
The groove is divided into two functional segments: a first vertical segment that prevents lifting and a second horizontal segment that facilitates insertion. This segmentation allows each part to perform its specific function optimally - the vertical segment provides security against accidental raising, while the horizontal segment maintains ease of assembly. The divided structure resolves the contradiction between reliability and ease of manufacture.
2Reliability
If a locking system is added to prevent shelf lifting, then the shelf stability is improved, but the device complexity increases
Solution Approach 1:
The invention merges the locking function directly into the groove structure itself, rather than adding a separate locking mechanism. The groove's geometry (vertical then horizontal segments) inherently provides the locking action against lifting while maintaining simplicity. This integration resolves the contradiction by achieving reliable fixation without increasing device complexity through additional components.
Solution Approach 2:
The groove structure performs the locking function automatically through its geometric design. When the plug is inserted horizontally along the second segment and reaches the blind end, the vertical first segment automatically prevents any upward movement. The system serves itself by using the plug's own insertion motion to engage the locking geometry, eliminating the need for separate locking mechanisms or complex assembly steps.
3Reliability
If the groove is designed with a deflected channel and undercut, then the fixed element is securely retained, but the manufacturing precision requirements increase
Solution Approach 1:
The undercut is applied locally at the blind end of the groove where the plug terminates, rather than requiring precision throughout the entire groove length. This localized feature provides the retention function by preventing the plug from being pulled out, while the majority of the groove can be manufactured with standard tolerances. The local application of the undercut resolves the contradiction between reliable retention and manufacturing precision.
Data Source
Figure 1~6
Figure 7a~7d
AI summary
To lock a shelf (12) of a furniture item or of a shelving unit to a fixed element (50) projecting from the wall of the furniture item or shelving unit, on the sides (18) of the shelf a superficial groove (20) is made which is formed by the junction of at least a first segment (22) which is - in use - vertical and a second segment (24) which is angled with respect to the first one and has a blind end, so that the groove can be coupled to the fixed element thereby bringing the latter to the blind end by travelling the first and second segments in sequence.