Split Ottoman Linkage with Slotted Coupling for Entrapment Prevention
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Solution Overview
Problem
Existing chair ottoman linkages face entrapment issues when retracting, especially in motorized mechanisms, as objects can interfere with the closing linkage path, leading to potential entrapment and operational hazards.
Innovation Solution
A split ottoman linkage with a slotted coupling arrangement between the upper ottoman bracket and the front ottoman link, allowing for a relief mechanism that accommodates objects, enabling safe retraction by providing a controlled movement path to prevent entrapment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the linkage moves from extended to stowed position, then the ottoman retracts to its closed position, but objects may move into the path of the closing linkage creating entrapment
Solution Approach 1:
The patent applies the dynamics principle by making the coupling arrangement movable through a slot mechanism. The linkage transitions from a fixed rigid connection to a dynamic movable connection, allowing the bracket to slide along the slot in the front ottoman link. This dynamic adjustment enables the linkage to adapt its path during retraction, preventing entrapment of objects while maintaining reliable operation.
2Strength
If a fixed rigid linkage is used, then the structure is simple and strong, but it cannot accommodate objects in its path during retraction
Solution Approach 1:
The patent applies segmentation by dividing the rigid linkage into separable components: the upper ottoman bracket, the front ottoman link with slot, and the coupling arrangement. This segmentation allows relative movement between components while maintaining overall structural integrity. The bracket can slide independently along the slot during entrapment events, providing adaptability without compromising the strength of individual components.
3Ease of manufacture
If the linkage path is fixed, then the mechanism is simple to manufacture, but it creates entrapment risks when objects are present
Solution Approach 1:
The patent introduces an intermediary element - the slot in the front ottoman link - that mediates between the fixed structural requirements and the need for adaptive movement. The slot acts as a guide pathway that allows controlled movement of the bracket while maintaining a relatively simple manufacturing process. This intermediary structure provides entrapment relief without requiring complex mechanisms.
Data Source
AI summary
A split ottoman linkage is provided that has a slotted upper ottoman bracket. The slot of the upper ottoman bracket is shaped to maintain the pivotal coupling between the upper ottoman bracket and a front ottoman link in normal operation. If an entrapment is encountered as the split ottoman linkage closes, the slotted connection allows the upper ottoman bracket to pivot away from the entrapment to provide some relief.