Stationary Crib Side Rail Locking Assembly Without Loose Screws
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Solution Overview
Problem
Conventional infant crib assembly methods for stationary side rails are burdensome and insecure, often requiring tools and leading to loose screws over time due to child movement.
Innovation Solution
The use of pivot lock and swivel lock hardware allows for tool-free assembly and secure attachment of stationary side rails to the headboard and footboard, utilizing keyed and arcuate guides for pivotal movement and locking, ensuring stability and preventing inadvertent disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screws or machine screws are used to secure stationary side rails to corner posts, then the side rails can be firmly attached initially, but the screws tend to loosen over time due to child movement and shaking
Solution Approach 1:
The locking mechanism incorporates a spring-loaded button that dynamically adjusts to maintain constant locking pressure. The spring ensures continuous force application on the locking surfaces, compensating for vibrations and movements that would otherwise cause loosening, thereby maintaining both initial strength and long-term reliability
Solution Approach 2:
The mechanism includes a spring-loaded button that provides continuous feedback force to maintain engagement between the male key and female opening. The spring automatically compensates for wear and movement-induced gaps, ensuring the locking surfaces remain in constant contact to prevent loosening over time
2Strength
If conventional screw assembly methods are used for stationary side rails, then the rails can be secured to corner posts, but the assembly process becomes burdensome and requires tools
Solution Approach 1:
The patent replaces the screw-threaded mechanical fastening system with a direct insertion and pivoting locking mechanism. The male key assembly simply inserts into the female opening and pivots to lock, eliminating the need for threaded fasteners and tool-based assembly while maintaining secure attachment
Solution Approach 2:
The locking mechanism is designed to be self-securing through a simple pivoting action that automatically engages the lock when the side rail is positioned vertically. The spring-loaded button automatically maintains locking pressure without requiring additional fastening operations or tools
3Reliability
If machine screws are used to meet federal standards, then the stationary side rails can be securely attached, but the screws can get lost during disassembly and require tool removal
Solution Approach 1:
The patent replaces screw fasteners with an integrated locking mechanism where the male key assembly is permanently attached to the side rail and the female opening is built into the corner post. Disassembly simply requires reversing the pivoting action, eliminating the risk of losing small fasteners and removing the need for tools
Solution Approach 2:
The locking components are merged into integral parts of the side rail and corner post structures. The male key assembly is permanently attached to the rail, and the female opening is formed as part of the post, eliminating separate fasteners that could be lost and simplifying the assembly/disassembly process
Data Source
AI summary
A crib includes a headboard; footboard; a first stationary side rail connected between the headboard and footboard and including upper and lower rails; a second side rail connected between the headboard and footboard; pivot lock hardware including a first engagement member at ends of the upper rail member and a second engagement member at respective corner posts, each second engagement member pivotally engaged with a first engagement member to permit pivotal movement of the first stationary side rail relative to the headboard and footboard and to lock the stationary side rail relative to the headboard and footboard; and swivel lock hardware including a third engagement member at ends of the lower rail member and a fourth engagement member at respective corner posts, each fourth engagement member being pivotally engaged with a respective third engagement member to lock the stationary side rail relative to the headboard and footboard.