Shelf Lock Assembly for Retrofittable Mobile Appliance Stability
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Solution Overview
Problem
Mobile appliances lack effective locking features for shelves and drawers, which can lead to contents falling during transportation, and existing residential appliances do not have the necessary locking mechanisms for mobile operations, requiring additional modifications for retrofitting.
Innovation Solution
A shelf lock assembly that includes a bracket lock system which inhibits rotational movement of shelf brackets, preventing removal and adjustment, and can be easily integrated with existing hardware without extensive modifications, using mounting apertures and bracket retainers to secure shelves in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locking features are added to mobile appliances, then safety and stability during transit is improved, but device complexity and installation effort increases
Solution Approach 1:
The locking system is divided into separate modular components: a bracket lock that attaches to the shelf bracket, a retainer that engages with mounting apertures, and a locking mechanism with spring and cam. This segmentation allows each component to perform its specific function independently and enables easy installation or removal without modifying the entire appliance structure.
Solution Approach 2:
The locking mechanism incorporates a spring-loaded cam that automatically engages with the retainer when the shelf bracket is inserted into the mounting aperture. The spring provides continuous engagement force, and the cam geometry ensures positive locking without requiring external actuators or complex control systems, thereby reducing overall device complexity.
2Reliability
If locking features are added to mobile appliances, then safety and stability during transit is improved, but installation effort and modifications required increases
Solution Approach 1:
The bracket lock and retainer assembly is designed to work with standard shelf bracket configurations and mounting aperture patterns found in residential appliances. The mounting apertures can be formed integrally in the cabinet or provided by mounting rails, allowing the locking system to be retrofitted to existing appliances without extensive structural modifications.
Solution Approach 2:
The bracket lock is pre-assembled with the retainer and spring mechanism before installation. The retainer is pre-formed with engagement features that match the mounting aperture geometry. This preliminary preparation allows for quick installation by simply attaching the bracket lock to the shelf bracket and inserting it into the mounting aperture, minimizing on-site installation effort.
3Reliability
If shelves are made locked in position, then safety during mobile operations is improved, but ease of operation and adjustability deteriorates
Solution Approach 1:
The locking system transitions between two states: locked and unlocked. The cam mechanism can be rotated to disengage from the retainer, releasing the shelf bracket from the mounting aperture. This dynamic switching capability allows users to easily transition between locked (for transport) and unlocked (for adjustment or removal) states without permanent modification to the shelf positionability.
Solution Approach 2:
The spring-loaded retainer is designed to maintain continuous engagement pressure on the cam, preventing accidental disengagement during normal shelf use or adjustment. The preliminary engagement force ensures that intentional unlocking action is required, preventing unintended shelf movement or removal while maintaining ease of deliberate operation.
Data Source
AI summary
Present embodiments relate to a shelf system for an appliance which has a lock device that may be easily retrofitted to render the shelves locked in position rather than removable and/or adjustable. The lock system inhibits rotation of the shelf in a direction normally required for removal of the shelf and movement thereof. The lock may be formed integrally or may be formed separately of the shelf support or bracket and may be connected to the bracket once the shelf is in a desired position in order to lock the shelf in place.