Spa Lift Assembly Spring Counterweight Mechanism
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Solution Overview
Problem
Spa covers are heavy and difficult for users to manually lift and lower, requiring significant effort and potentially leading to heat loss due to inadequate insulation and ease of use issues.
Innovation Solution
A lift assembly with a lever arm and resilient spring mechanism that assists in moving the spa cover between open and closed positions, featuring a motor-driven sprocket system for automated operation, reducing user effort and enhancing insulation by facilitating easier cover management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the spa cover is made heavy and insulated, then heat retention is improved, but the ease of operation deteriorates
Solution Approach 1:
The resilient spring acts as a counterweight mechanism that offsets the weight of the heavy insulated spa cover. The spring is positioned and tensioned to provide upward force on the lever arm, which is connected to the cover, thereby reducing the effort required by users to lift and move the cover while maintaining the cover's full insulation capabilities.
Solution Approach 2:
The lever arm serves as an intermediary mechanical element between the spring force and the spa cover. The lever arm pivots on the housing and transfers the spring's resilient force to the cover, providing mechanical advantage and enabling easy movement of the heavy insulated cover through a simple spring mechanism.
2Device complexity
If manual lifting of the spa cover is required, then device complexity is reduced, but user effort increases
Solution Approach 1:
The resilient spring provides a counterweight effect that compensates for the cover's weight, reducing the force users must exert. The spring is configured to engage with the lever arm system, providing continuous assistance during cover movement without requiring complex active control systems or multiple components.
Solution Approach 2:
The spring-loaded lever arm system is self-regulating and automatically adjusts to the cover's position and weight. The spring provides resilient force that naturally assists cover movement in both opening and closing directions, eliminating the need for external power sources, controls, or complex mechanical systems while significantly reducing user effort.
3Ease of operation
If automated motor-driven operation is added, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex automated mechanical systems (motors, gears, controllers) with a simple resilient spring mechanism. The spring provides automated assistance through its elastic properties, creating a passive system that requires no power source, control electronics, or complex mechanical transmissions while still enabling easy cover operation.
Solution Approach 2:
The spring-loaded system is entirely self-regulating and self-powered through the stored elastic energy in the spring. The mechanism automatically adapts to the cover's weight and position, providing assistance throughout the movement range without requiring external control systems, sensors, or power sources, thereby maintaining simplicity while achieving automated operation benefits.
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 lift assembly significantly reduces the user effort required to move the spa cover, enhances insulation by maintaining heat, and provides a convenient, automated mechanism for opening and closing the cover, improving user experience and energy efficiency.
Implementation Method 1
a resilient spring positioned inside the housing behind the sidewall, the spring having a first end drivingly coupled to the lever arm so that in the open position of the lever arm, the spring urges the lever arm to rotate toward the closed position and in the closed position of the lever arm, the spring urges the lever arm to rotate toward the open position
Implementation Method 2
a motor drivingly coupled to the lever arm and operable to automatically move the lever arm between the open and closed positions
Data Source
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AI summary
A lift assembly for a spa cover is disclosed. The spa cover is for covering an open upper end of a spa. The lift assembly includes a lever arm having a first portion for supporting a spa cover, and a first end for pivotable coupling to a sidewall of a spa for rotation of the lever arm between a closed position in which the spa cover rests on the upper end of the spa, and an open position in which the spa cover is displaced from the upper end of the spa. The lift assembly also includes a resilient spring having a first end coupled to the lever arm, and a second end for coupling to the sidewall of the spa. In the open position of the lever arm, the spring urges the lever arm to rotate toward the closed position. A spa including the lift assembly is also disclosed.