Height-Adjustable Table Pulley Frame for Low-Effort Lifting
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Solution Overview
Problem
Existing height-adjustable tables often require significant user effort to adjust the work surface height due to the fixed cross-beam designs and variable radius force-exchange mechanisms, which can be aesthetically unpleasing and limit leg space.
Innovation Solution
A height-adjustable table design featuring a vertically movable frame with a pulley mechanism, a spring, and a block-and-tackle assembly that transfers the upward force exerted by the spring over a greater distance, allowing for smoother and easier height adjustment with a mechanical advantage, and a load adjustment mechanism to balance the force applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fixed cross-beam design is used to house counter-balance mechanism components, then the structural stability is improved, but the user effort required for height adjustment increases and leg space is reduced
Solution Approach 1:
The patent transitions from a fixed cross-beam design to a dynamic, vertically movable frame that telescopes within the lower legs. This dynamic structure allows the counter-balance mechanism components to move with the frame during height adjustment, reducing user effort while maintaining structural stability through the telescoping configuration and pulley-based force distribution.
Solution Approach 2:
The frame is divided into separable components: an upper frame assembly that moves vertically within lower legs. This segmentation allows the counter-balance mechanism to be distributed across multiple moving parts rather than constrained in a fixed beam, improving ease of operation while preserving overall structural integrity through the telescoping connection.
2Ease of operation
If a variable radius force-exchange wheel mechanism is used, then the mechanical advantage is improved, but the aesthetic appearance deteriorates and leg space is limited
Solution Approach 1:
The patent extracts the force-exchange wheel mechanism from visible locations and integrates it within the vertically movable frame structure. The pulley mechanism and tension lines are contained within the frame's interior space, eliminating the need for external variable radius wheels and improving aesthetic appearance while preserving the mechanical advantage through the pulley-based force multiplication.
Solution Approach 2:
The patent uses tension lines and pulleys as intermediary elements to transmit and multiply force between the spring mechanism and the frame. This intermediary system achieves the mechanical advantage of variable radius wheels while using simpler, more aesthetically pleasing components that can be concealed within the frame structure.
3Ease of operation
If a vertically movable frame with pulley mechanism is used, then the user effort is reduced and aesthetic appearance is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple functions into the vertically movable frame: it serves as both the structural support and the housing for the counter-balance mechanism. The pulley mechanism, spring, and frame movement are integrated into a single coordinated system, reducing the number of separate components and simplifying the overall device despite the sophisticated force-exchange functionality.
Solution Approach 2:
The vertically movable frame performs multiple functions simultaneously: it provides structural support, houses the counter-balance mechanism, enables height adjustment, and improves aesthetic appearance. This multi-functionality reduces the need for separate dedicated components, thereby reducing overall device complexity while achieving reduced user effort.
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 design provides a smoother load curve over a greater range of movement, reducing user effort and offering a more aesthetically pleasing and space-efficient solution by housing the counter-balance mechanism within a vertically movable frame.
Implementation Method 1
The spring can be adapted to exert an upward force on the frame over the first distance
Implementation Method 2
The block-and-tackle assembly can be adapted to cooperate with the pulley mechanism to transfer the upward force exerted by the spring over the first distance to the frame, wherein the force exerted by the spring over the first distance contributes to upward vertical movement of the frame over a second distance
Implementation Method 3
The pulley mechanism can include a first plurality of pulleys located in the passage
Implementation Method 4
The block-and-tackle assembly can be adapted to cooperate with the pulley mechanism to transfer the upward force exerted by the spring over the first distance to the frame, wherein the force exerted by the spring over the first distance contributes to upward vertical movement of the frame over a second distance. The second distance can be greater than the first distance.
Data Source
AI summary
A height-adjustable table can include a frame supporting a work surface; a pair of lower legs supporting the frame; a pulley mechanism coupling the frame and the pair of lower legs for vertically moving the frame relative to the pair of lower legs; and a spring located within a passage extending through the frame. The spring may have a fixed end secured to the frame and a movable end movable relative to the frame over a first distance for exerting a force over the first distance. The table can have a block-and-tackle assembly located within the passage and coupling the movable end of the spring to the pulley mechanism. The block-and-tackle assembly can transfer the force exerted by the spring over the first distance to vertical movement of the frame relative to the pair of lower legs over a second distance greater than the first distance.