Height adjustable device
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Solution Overview
Problem
Existing height adjustable devices lack a consistent lifting force throughout their vertical adjustment range, leading to inadequate support as the scissor leg arms move closer to a horizontal position.
Innovation Solution
Incorporating a combination of energy storage members, such as a locking gas spring acting on horizontal forces and a torsion spring acting on angular forces at the scissor joints, to maintain a constant vertical lifting force throughout the adjustment range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single energy storage member is used in the scissor linkage, then the device structure is simple, but the lifting force varies throughout the vertical adjustment range
Solution Approach 1:
The patent combines two energy storage members (a first energy storage member and a second energy storage member) in the scissor linkage system. The first energy storage member is coupled to the scissor linkage arms, while the second energy storage member is coupled to the scissor joint, creating a dual-energy storage system that works together to provide consistent lifting force throughout the vertical adjustment range.
Solution Approach 2:
The patent changes the parameters of the energy storage system by introducing a second energy storage member with different characteristics (coupled to the scissor joint versus coupled to the arms). This parameter change allows the system to maintain constant lifting force by compensating for the varying mechanical advantage throughout the range of motion.
2Length of moving object
If the scissor leg arms move closer to a horizontal position, then the device achieves full vertical adjustment range, but the lifting force decreases
Solution Approach 1:
The second energy storage member, coupled to the scissor joint, provides preliminary counteracting force that increases as the scissor leg arms approach the horizontal position. This preliminary anti-action compensates for the decreasing lifting force from the first energy storage member, ensuring consistent support throughout the full vertical adjustment range.
Solution Approach 2:
The second energy storage member acts as an intermediary element between the scissor joint and the load, mediating the force transmission. As the scissor arms approach horizontal position, the second energy storage member provides additional force through the joint, compensating for the geometric disadvantage and maintaining consistent lifting capability.
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
This configuration ensures a consistent lifting force is maintained, allowing the device to support weights effectively across its entire vertical travel range, enabling stable operation in both standing and sitting positions.
Implementation Method 1
a first energy storage member coupled to the worksurface and connected by at least one tension member to the bracket, wherein the first energy storage member is configured to bias the bracket in a horizontal direction
Implementation Method 2
a second energy storage device, such as a spring (torsion or equivalent) can be added to the scissor legs, such as at a link or joint between the scissor leg arms, and can increase in force as the scissor leg arms rotate relative to one another
Data Source
AI summary
A height adjustable device can comprise: a base; a first scissor linkage assembly coupled to the base and having a first scissor joint; a second scissor linkage assembly coupled to the base and having a second scissor joint; a worksurface coupled to the first and second scissor linkages; a bracket movably coupled to the first scissor linkage and the second scissor linkage and movable relative to the worksurface; and a first energy storage member coupled to the worksurface and connected by at least one tension member to the bracket, wherein the first energy storage member is configured to bias the bracket in a horizontal direction.