Drawer Rail Coupling With Spring Bars for Tool-Free Removal
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Solution Overview
Problem
Existing cupboard designs with pull-out parts connected to rails lack simplicity and ease of detachment for technically inexperienced users, requiring complex tools or mechanisms for secure attachment and separation.
Innovation Solution
The use of molded parts with parallel spring bars and splayed tabs that fit into longitudinal slots on the rails, allowing for secure attachment in all coordinate directions and easy detachment by lifting the pull-out part, preventing unintentional loosening during normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex tools or mechanisms are used for secure attachment and separation, then the connection reliability is improved, but the device complexity increases and ease of operation deteriorates
Solution Approach 1:
The spring bar with splayed tabs automatically engages with the longitudinal slot and locking groove to secure the pull-out part, and can be released by simple upward lifting action. The system serves itself by using the spring bar's elastic properties to maintain secure connection during normal use while allowing easy release when needed, eliminating the need for complex tools or mechanisms.
Solution Approach 2:
The spring bar acts as an intermediary element between the molded part and the running rail. It mediates the connection by providing both secure attachment through tab engagement with the locking groove and easy separation through upward lifting that compresses the spring bar. This intermediary component simplifies the overall attachment mechanism while maintaining reliability.
2Ease of operation
If simple means are used for detachable connection, then the device complexity is reduced and ease of operation is improved, but the connection reliability may deteriorate
Solution Approach 1:
The spring bar utilizes changes in its elastic parameters (compression and expansion) to achieve both secure connection and easy release. During normal operation, the spring bar is in an expanded state providing strong holding force through the splayed tabs engaging the locking groove. When upward lifting force is applied, the spring bar compresses, allowing the tabs to disengage from the groove, enabling simple detachment while maintaining connection security during use.
3Ease of operation
If the pull-out part can be easily separated by lifting, then the ease of operation is improved, but unintentional loosening during normal operation may occur
Solution Approach 1:
The release mechanism works in reverse of the engagement mechanism. Engagement occurs through forward pushing motion where the spring bar expands and tabs engage the locking groove. Release occurs through upward lifting motion that compresses the spring bar and disengages the tabs. This inverted relationship between engagement (pushing) and release (lifting) ensures that normal pulling/out operations cannot accidentally trigger release, as they apply force in the wrong direction.
Solution Approach 2:
The splayed tabs on the spring bar are designed to engage with the locking groove in advance, creating a preliminary mechanical interlock that prevents unintentional loosening. The geometry of the tabs and groove is designed such that normal operational forces (pulling out or pushing in) cannot overcome the engagement, while only a deliberate upward lifting force can compress the spring bar enough to disengage the tabs.
4Ease of manufacture
If molded parts with spring bars and splayed tabs are used, then the ease of manufacture is improved, but the manufacturing precision requirements may increase
Solution Approach 1:
The spring bar's elastic properties provide a tolerance buffer for manufacturing variations. The splayed tabs can engage with the locking groove within a range of positional tolerances because the spring bar can compress and expand to accommodate minor misalignments. This reduces the stringency of manufacturing precision requirements while still ensuring reliable engagement when the pull-out part is properly installed.
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
Enables a structurally simple and tool-free detachable connection that is secure yet easily separable, ensuring the pull-out part can be fixed and removed without tools, suitable for technically inexperienced users, with secure fixing in all directions.
Implementation Method 1
the splayed tabs at the ends of the spring bars passing through the longitudinal slots are pressed together when upward forces are exerted by lifting the extension part due to the resilient properties of the spring bars
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
The invention relates to a cabinet having a pull-out part (1), preferably a drawer, wherein the pull-out part (1) is connected to rails (4) of pull-out guides (2) and is fixed relative to the rails (4) in all coordinate directions and can be removed from the rails (4) without tools if needed, wherein the pull-out part (1) is secured against lifting off and against transverse displacement relative to the rails (4) in the back side area, said cabinet being designed so that a molded part (6) is attached to the pull-out part (1) or to the rails (4) for coupling the pull-out part (1) to the front end areas of the rails (4), wherein each molded part (6) comprises two spring bars (12) running parallel to each other, spaced apart from each other, and each penetrating the corresponding rail (4) in the area of a longitudinal slit (16) open to the front side of the rail, or of a longitudinal slit (16) corresponding to the pull-out part (1) to be coupled and open to the back side of the pull-out part, each comprising lugs (13) spread apart from each other in opposite directions at the ends thereof penetrating the longitudinal slit (16) and having mounting legs (14) also spread apart from each other in opposite directions at the ends thereof facing the opening of each longitudinal slit (16), said legs being supported in a form-fit and/or force-fit manner within each longitudinal slit (16) against displacement in the direction of the front side of the rails (4).