Top-Mounted Counterbalance for Load-Adjustable Height Tables
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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 due to excessive force requirements or uncontrolled movement of the work surface.
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, along with a preload mechanism to adjust counter-weighting force and ensure safe, effortless height adjustment.
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. Specifically, the constant-force spring and pulley system are integrated into the housing that supports the work surface, separating the counterbalance function from the load-bearing legs and eliminating the need for bulky cross-members.
Solution Approach 2:
The counterbalance mechanism transitions from a horizontal arrangement (cross-member beams between legs) to a vertical arrangement (within the top assembly housing). The constant-force spring is positioned vertically above the work surface, with cables running through pulleys to provide counterbalance force, utilizing the vertical dimension to achieve the same functional effect with minimal horizontal space.
2Device complexity
If counterbalance force is preset and fixed, then the mechanism is simple, but it cannot accommodate varying loads leading to excessive force requirements or uncontrolled movement
Solution Approach 1:
The counterbalance mechanism transitions from a static, fixed-force system to a dynamic, adjustable-force system. The constant-force spring mechanism allows the counterbalance force to be adjusted by the user through a simple operation (pressing down on the work surface), enabling the system to adapt to varying loads while maintaining constant-force characteristics during operation.
Solution Approach 2:
The counterbalance force parameter is made variable through user adjustment. By pressing down on the work surface, the user changes the pre-tension of the constant-force spring, thereby adjusting the counterbalance force to match the actual load. This parameter change enables the system to safely accommodate different load conditions without requiring a complex variable-force mechanism.
3Adaptability or versatility
If constant-force spring is used for counterbalance, then load-variable adjustment is achieved, but the spring must be pre-loaded to match the load
Solution Approach 1:
The system performs preliminary action by allowing the user to pre-load the constant-force spring before actual use. During initial setup or when changing loads, the user presses down on the work surface to tension the spring to the appropriate level. This preliminary adjustment ensures the counterbalance force matches the expected load, and the system maintains this setting during normal operation.
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, load-variable counterbalance mechanism that ensures safe and effortless height adjustment of the work surface, eliminating safety risks associated with non-load variable systems while maintaining minimal effort and optimal leg room.
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
counterbalance mechanism integrated into the top assembly of the table
Implementation Method 3
tension spring coupled to a snail cam pulley by a snail cable
Implementation Method 4
synchronized lift mechanism with pulley systems and bands
Implementation Method 5
pulley system can comprise first and second pulley assemblies each having an upper pulley and a lower pulley
Data Source
AI summary
A height adjustable table, which has a 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.