Height-Adjustable Table With Top-Mounted Constant-Force Counterbalance
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Solution Overview
Problem
Existing height adjustable tables with counterbalance mechanisms either result in a bulky base that reduces leg room or fail to accommodate varying loads, leading to safety hazards and inefficient height adjustments.
Innovation Solution
A height adjustable table with a constant-force counterbalance mechanism integrated into the top assembly, featuring a tension spring coupled to a snail cam pulley by a snail cable, and a synchronized lift mechanism with pulley systems and bands, allowing for load-variable adjustments and minimal effort height changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If counterbalance mechanisms are disposed within table legs or cross-member beams, then height adjustment is effortless, but the support structure becomes bulky and reduces leg room
Solution Approach 1:
The counterbalance mechanism is extracted from the traditional locations (table legs and cross-member beams) and relocated to the top assembly. This extraction allows the base structure to become compact and minimizes leg room occupation while maintaining the effortless height adjustment function through the constant-force mechanism.
Solution Approach 2:
The counterbalance mechanism is repositioned from the vertical dimension (within legs) or horizontal dimension (cross-member beams) to the top assembly dimension. This dimensional relocation resolves the spatial conflict between mechanism volume and leg room requirements.
2Volume of moving object
If gas springs provide preset counterbalance force, then more leg room is provided, but the mechanism cannot accommodate varying loads
Solution Approach 1:
The counterbalance mechanism transitions from a static preset force system (gas springs) to a dynamic constant-force system. The constant-force counterbalance mechanism adapts to varying loads by maintaining optimal counterbalance force throughout the adjustment range, enabling effortless operation with different weight configurations on the work surface.
Solution Approach 2:
The counterbalance force parameter is changed from a fixed preset value to a constant force that maintains effectiveness across varying load conditions. This parameter optimization allows the mechanism to accommodate different loads while keeping the base structure compact.
3Ease of operation
If counterbalance force exceeds applied load, then height adjustment is easy, but the work surface moves rapidly creating safety hazards
Solution Approach 1:
The constant-force counterbalance mechanism incorporates feedback through its mechanical design, where the force exerted by the spring is regulated to match the applied load. This feedback control prevents the work surface from moving too rapidly by maintaining force equilibrium, ensuring safe operation while preserving ease of adjustment.
Solution Approach 2:
The counterbalance mechanism applies preliminary counterbalancing force that is precisely calibrated to match the applied load before movement occurs. This preliminary anti-action prevents excessive motion by counteracting the load appropriately, eliminating safety hazards while maintaining effortless adjustment.
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 provides a non-bulky design that accommodates varying loads, ensuring safe and effortless height adjustments while preventing safety risks associated with non-load variable counterbalance tables.
Implementation Method 1
the counterbalance mechanism, which can comprise a tension spring coupled to a snail cam pulley by a snail cable
Implementation Method 2
coupled to a snail cam pulley by a snail cable
Implementation Method 3
The synchronized lift mechanism can comprise at least two bands operatively engaged with a pulley system disposed within the right and left telescoping leg assemblies
Data Source
AI summary
A height adjustable table, which has a constant-force counterbalance mechanism integrated into a top assembly of the table is disclosed. The height adjustable table can include a top assembly supported by a base assembly, which can include right and left telescoping leg assemblies. The top assembly can include a work surface supported by a housing. A counterbalance mechanism, which can include a spring coupled to a snail cam pulley, can be mounted within the housing. A synchronized lift mechanism, which can include at least two bands operatively engaged with a pulley system disposed within the right and left telescoping leg assemblies, can be operatively coupled to the snail cam pulley such that the counterbalance force provided by the counterbalance mechanism is transmitted to the synchronized lift mechanism.