Seat Chassis Height Adjustment With Non-Parallel Screw Drive
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Solution Overview
Problem
Conventional height-adjustable seating furniture chassis require a large amount of constructional space, making them unsuitable for users who need a compact design without compromising stability, especially under heavy loads.
Innovation Solution
A seating furniture chassis with a non-parallel arrangement of the shaft and threaded rod longitudinal axes, coupled with a bevel gear for torque transmission, and optionally a second threaded rod for increased stability, allowing for height adjustment while saving space and maintaining stability under heavy loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional height-adjustment mechanism with parallel shaft and threaded rod is used, then the mechanism provides stable support, but it requires a large amount of constructional space
Solution Approach 1:
The patent applies dimensionality change by arranging the shaft and threaded rod at non-parallel angles (specifically perpendicular orientations) rather than parallel alignment. This spatial reconfiguration reduces the linear space required for the mechanism while maintaining its load-bearing capacity through optimized force distribution across angled components.
Solution Approach 2:
The invention introduces asymmetry in the mechanical arrangement by using non-parallel, specifically perpendicular, orientations between the shaft and threaded rod. This asymmetric configuration differs from conventional parallel arrangements and enables compact space utilization while preserving structural stability through balanced force vectors.
2Volume of moving object
If the shaft and threaded rod are arranged non-parallel to save space, then constructional space is reduced, but the stability under heavy loads may be compromised
Solution Approach 1:
The patent changes the geometric parameter of component orientation from parallel to non-parallel (perpendicular) arrangement. This parameter modification reduces the bounding box volume of the mechanism while the load-bearing capacity is maintained through compensating design features such as reinforced connection points and optimized thread geometry.
Solution Approach 2:
The invention incorporates preliminary stabilizing measures in the form of support struts and bracing elements that are pre-positioned to counteract potential instability from the non-parallel arrangement. These preliminary structural reinforcements ensure that load-bearing capacity is maintained before actual use, preventing deformation or failure under heavy loads.
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 effectively reduces constructional space requirements while providing sufficient stability for heavy users, as demonstrated by tests with unexpected success even under heavy loads, and allows for inclined seat and backrest adjustments for easier sitting and standing.
Implementation Method 1
the bevel gear is coupled to the shaft and the threaded rod, so that the torque is able to be transmitted from the shaft to the threaded rod via the bevel gear
Implementation Method 2
a rotation of the threaded rod is converted into a height adjustment of the seat surface by means of the height-adjustment mechanism
Data Source
AI summary
A seating furniture chassis having a height-adjustable seat surface, a drive means, a shaft, a height-adjustment mechanism and a threaded rod, wherein the drive means is coupled to the shaft and is designed to transmit a torque to the threaded rod by means of the shaft, and wherein the height-adjustment mechanism is coupled to the threaded rod and to the seat surface such that a rotation of the threaded rod is converted into a height adjustment of the seat surface by means of the height-adjustment mechanism, characterized in that a longitudinal axis of the shaft is not arranged parallel to a longitudinal axis of the threaded rod.