Vertically Actuable Spa Cover with Rack and Pinion Lift
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Solution Overview
Problem
Conventional spa covers are prone to damage from chemical vapors, tearing, and excessive wear, and are not designed to support weight, while existing solutions for roof structures over spas are costly and require additional covers.
Innovation Solution
A vertically actuable cover assembly using a rack and pinion system or tension member with rotatable guides, powered by motors, housed within telescoping tubular members to elevate and lower the cover, providing a roof structure and supporting the cover's weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fabric covered foam spa cover is used, then the spa is protected from contamination and evaporation, but the cover is susceptible to chemical vapors, tearing, and excessive wear
Solution Approach 1:
The patent changes the material parameters from fabric-covered foam to rigid or semi-rigid materials such as plastic, metal, or composite materials. This material substitution fundamentally alters the cover's resistance to chemical vapors, tearing, and wear, directly resolving the durability issue while maintaining protective functions.
Solution Approach 2:
The patent employs composite material structures (rigid or semi-rigid materials combining multiple properties) to create a cover that simultaneously resists chemical vapors, mechanical tearing, and wear. These composite structures provide enhanced reliability compared to conventional single-material covers.
2Reliability
If a conventional flat spa cover is used, then the spa is protected, but the cover cannot handle the weight of persons or snow accumulation
Solution Approach 1:
The patent changes the structural parameters by transitioning from a flat cover design to a domed or arched three-dimensional structure. This geometric transformation increases the moment of inertia and distributes loads more effectively, enabling the cover to support weights of persons and snow accumulation without compromising structural strength.
Solution Approach 2:
The patent adopts a domed or arched curvature in the cover structure, which inherently provides higher load-bearing capacity. The curved geometry allows for better stress distribution across the structure, enabling it to withstand weight loads that would collapse a flat cover design.
3Reliability
If a fixed roof structure is built around the spa, then protection from weather and sun is provided, but additional expense and complexity are required
Solution Approach 1:
The patent creates a multi-functional cover structure that simultaneously serves as a protective barrier against weather and sun, and as an integrated roof structure. By combining these functions into a single vertically actuable assembly, the patent eliminates the need for separate fixed roof structures and additional covers, thereby reducing overall system complexity while maintaining comprehensive protection.
Solution Approach 2:
The patent merges the functions of a protective cover and a roof structure into a single integrated vertically actuable assembly. This consolidation combines the protective barrier function with the roofing function, eliminating the need for separate structures and reducing overall system complexity and cost.
4Adaptability or versatility
If a vertically actuable cover is implemented, then the cover can serve as both a protective cover and a roof structure, but complex lifting mechanisms are required
Solution Approach 1:
The patent achieves versatility by designing a single vertically actuable cover assembly that performs multiple functions: it serves as a protective cover when lowered and as a roof structure when elevated. This multi-functionality is achieved through a unified design that eliminates the need for separate mechanisms, thereby managing complexity while enhancing adaptability.
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
The solution offers a reliable, cost-effective, and aesthetically pleasing system that can handle weight and reduce maintenance needs, acting as both a cover and a roof, while minimizing damage from environmental factors.
Implementation Method 1
The lifting means are housed within telescoping tubular members which act to provide an aesthetic covering for the lifting means and which may or may not form a part of the lifting means structure
Implementation Method 2
powered by a motor
Implementation Method 3
The lifting means are housed within telescoping tubular members which act to provide an aesthetic covering for the lifting means
Data Source
AI summary
An actuator and an assembly utilizing two or more actuators for vertically actuating a cover for a spa. In the lowered position the cover protects the spa and in the elevated position the cover acts as a roof over the spa. The actuator is either a rack and pinion assisted by a cable and pulley or a chain and a plurality of sprockets assisted by a cable and pulley which are connected to lift member which are generally shrouded by telescoping tubes to cover the actuators or to act as lift members themselves. The system can be further enhanced using a gas spring to assist in lifting the cover and reduce the load of the cover weight off the motor which is used to actuate the actuators.