Height-Adjustable Table Load Compensator With Locking Counterbalance
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Solution Overview
Problem
Existing adjustable height tables with single pedestal support structures face challenges in providing a consistent counterbalance force that adjusts to varying loads and lacks safety mechanisms to prevent sudden movements due to overload or underload conditions, leading to potential hazards and wear on components.
Innovation Solution
A counterbalance assembly featuring a spring equalizer system with a snail cam pulley and adjustable preload force, combined with a locking mechanism that restricts movement during unbalanced conditions, ensures a constant upward force and prevents sudden table top movements by locking the nut rotation when overload or underload is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring counterbalance system is used to compensate for the weight of the upper column and table top, then the ease of operation is improved, but the device complexity increases due to additional components
Solution Approach 1:
The spring counterbalance system is nested within the hollow interior of the lower column, with the spring housed in a cylindrical cavity. The pulley is mounted on the inner surface of the lower column, and the cable runs through the hollow interior space. This nesting approach integrates the counterbalance components within the existing structural space, minimizing additional external complexity while providing weight compensation functionality.
2Adaptability or versatility
If the counterbalance force is increased to handle heavier loads, then the adaptability is improved, but the reliability decreases due to potential sudden movements under overload conditions
Solution Approach 1:
The system incorporates a locking mechanism that activates automatically when the table top exceeds maximum or minimum load thresholds. Load cells or sensors detect the weight conditions and trigger the locking mechanism to engage, preventing further movement. This feedback loop ensures that while the counterbalance system can adapt to different load ranges, it automatically safeguards against dangerous overload or underload conditions by restricting movement when thresholds are exceeded.
Solution Approach 2:
The locking mechanism transitions between locked and unlocked states based on dynamic load conditions. During normal operation within safe load ranges, the system remains unlocked allowing smooth height adjustment. When load thresholds are exceeded, the mechanism dynamically shifts to a locked state, preventing sudden movements. This dynamic response maintains adaptability for legitimate height changes while ensuring reliability through automatic safety intervention.
3Object-affected harmful factors
If a locking mechanism is added to prevent sudden movements, then the safety is improved, but the ease of operation decreases due to additional safety checks required
Solution Approach 1:
The locking mechanism operates autonomously based on load detection, eliminating the need for user intervention or manual safety checks. Load sensors continuously monitor the weight on the table top and automatically trigger the locking mechanism when threshold violations occur. During normal operation within safe parameters, the system remains unlocked without requiring user awareness or action. This self-service approach prioritizes safety through automatic monitoring while preserving ease of operation for legitimate adjustments.
4Manufacturing precision
If the spring is preloaded to provide constant upward force, then the manufacturing precision is improved, but the ease of manufacture decreases due to precise preload requirements
Solution Approach 1:
The spring is preloaded during the assembly process to establish the correct initial tension that provides constant upward force throughout the table top's range of motion. This preliminary action of setting the preload occurs once during manufacturing or initial assembly, after which the system maintains consistent counterbalance performance. The preload is calibrated to account for the weight of the upper column and table top, ensuring that the counterbalance force remains substantially constant regardless of the table top's vertical position. This preliminary setup achieves the desired manufacturing precision without requiring complex adjustments during 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 stable and adjustable counterbalance system that maintains a consistent upward force on the table top, preventing sudden movements and reducing wear on components, while ensuring safety by locking the nut rotation during unbalanced conditions, thus enhancing user safety and extending the lifespan of the table.
Implementation Method 1
a compression spring that applies a spring force in a first direction
Implementation Method 2
compensates for or balances at least a portion of the combined weight of the upper column, table top and load thereon
Implementation Method 3
The pulley includes a lateral surface spaced from the pulley axis, the lateral surface forming a helical cable channel that wraps around the pulley axis and that includes first and second channel ends so that at least a portion of the channel and the pulley axis forms channel radii perpendicular to the pulley axis, the radii increasing along at least a portion of the channel in the direction from the first channel end toward the second channel end
Implementation Method 4
a threaded shaft mounted at least partially within the channel for rotation about the adjustment axis, a nut threadably receiving the shaft
Implementation Method 5
a lever member supported by the first guide member and including at least a first nut engaging member, wherein the lever member restricts rotation of the nut with respect to the first guide member during at least a portion of travel of the first guide member within the channel and allows nut rotation in at least a first direction with respect to the first guide member when the first guide member is in at least a first position
Implementation Method 6
locking the nut rotation when overload or underload is detected
Data Source
AI summary
A force adjustment assembly for use within a telescoping subassembly that includes a first elongated member and a second elongated member that is supported by the first elongated member for sliding motion along an extension axis, the subassembly further including a force equalizer assembly that includes a strand having first and second ends that are supported by the second and first elongated members, respectively, the adjustment assembly comprising a preloader supported by at least one of the first and second elongated members and supporting at least a portion of the strand, the preloader applying a preload force via the strand when the second elongated member is in a fully extended position and an adjuster for adjusting the preload force applied by the preloader.