Spa tub cover system
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Solution Overview
Problem
Existing spa tub covers suffer from heat loss, unsightly discoloration of lower surfaces, and inadequate safety features, particularly in portable spa tubs, where the gap between cover portions allows heat escape and exposes users to unsightly lower surfaces when opened.
Innovation Solution
A spa tub cover system with first and second portions coupled by a living hinge, where the lengths of the portions differ to allow the cover to fold and open without a gap, incorporating a lifter mechanism for easy operation, and featuring a single lock mechanism for enhanced safety and a debris shield to prevent environmental debris from entering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the spa cover includes first and second portions of equal size with a hinge connecting them, then the cover can be folded back for removal and storage, but a gap is created between the portions when closed that allows heat loss
Solution Approach 1:
The patent applies asymmetry by making the first cover portion larger than the second cover portion. The first portion has a first width while the second portion has a second width that is less than the first width. This asymmetric design allows the smaller second portion to overlap the larger first portion when folded, eliminating the gap between cover portions and preventing heat loss, while still maintaining the ability to fold the cover back for removal and storage.
2Ease of operation
If the lower surfaces of the cover portions are exposed when the cover is opened, then the cover can be easily folded back for spa use, but the discolored lower surfaces become visible and unsightly to users
Solution Approach 1:
The patent applies inversion by reversing which surfaces are exposed during cover operation. When the cover is opened for spa use, the upper surfaces of both cover portions are positioned to face outward, while the lower surfaces face each other and remain hidden. This is achieved through the asymmetric sizing and folding mechanism, ensuring that the potentially discolored lower surfaces are never exposed to users, while still allowing easy folding back for spa use.
3Reliability
If multiple lock mechanisms are provided on each cover portion to prevent child entry, then safety is enhanced, but the device complexity and number of components increase
Solution Approach 1:
The patent applies merging by consolidating the locking function into a single lock mechanism located on the second cover portion. This single lock can engage with the first cover portion to secure the cover closed, preventing child entry. By combining the safety function into one mechanism rather than distributing multiple locks across both portions, the patent maintains child safety while reducing device complexity and the number of components.
4Reliability
If the cover portions are made wide enough to prevent hinge strain, then hinge durability is improved, but the cover becomes more difficult to lift and position
Solution Approach 1:
The patent applies segmentation by dividing the cover into two distinct portions of unequal size, with the smaller second portion serving as the primary lifting element. The hinge connects these segmented portions, allowing the smaller second portion to be lifted and positioned independently. This segmentation reduces the weight and difficulty of lifting while the hinge is designed with sufficient width to maintain durability, resolving the contradiction between hinge strength and ease of operation.
Data Source
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AI summary
A spa cover includes first and second portions that are rotatable along a pivot axis. The first portion has a first length traverse to the pivot axis, and the second portion has a second length extending in the same direction as the first length. The first length is longer than the second length. When the cover is moved from a closed configuration into an open configuration, lower surfaces of the first and second portions, which face the spa tub water when in the closed configuration and can become unsightly, are moved into a position in which they face each other, whereas the upper surface of the second portion faces the users in the tub. A lifter is provided for moving the spa cover between the closed and an open configurations.