Chair Tilt Mounting With Threaded Spring Tension Adjustment
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Solution Overview
Problem
Existing chair tilt mountings are not compact or simple in design, lacking efficient regulation of tilt resistance.
Innovation Solution
A tilt mounting device with an upper and lower part connected by tilt resistance springs, where the pre-tensioning is adjusted by altering the distance between spring seats using a rotatable adjusting lever, allowing for compact and simple regulation of tilt resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional tilt mounting designs are used, then tilt resistance regulation is achieved, but the construction becomes complex and bulky
Solution Approach 1:
The patent combines the spring mounting and tensioning function into a single integrated mechanism. The spring is directly mounted between the upper and lower spring seats, eliminating the need for separate tensioning devices. The adjusting lever directly modifies spring pre-tensioning through a threaded connection, merging adjustment and mounting functions into one compact assembly.
Solution Approach 2:
The lower spring seat serves multiple functions: it anchors the spring, provides an adjustment interface through the threaded connection with the adjusting lever, and acts as a structural connection point between the lower mounting part and the spring. This multi-functionality reduces the number of separate components needed.
2Ease of operation
If spring pre-tensioning is adjusted for tilt resistance regulation, then tilt control is improved, but the mechanism becomes more complex
Solution Approach 1:
The patent extracts the essential function of spring tensioning from complex tensioning devices and implements it through a simple threaded connection between the adjusting lever and lower spring seat. This removes unnecessary complexity while retaining the core adjustment capability.
Solution Approach 2:
The adjusting lever with threaded connection allows the user to directly and easily modify spring pre-tensioning without requiring additional tools or complex mechanisms. The system serves itself by using the same structural components (threaded connection) for both assembly and adjustment functions.
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 compact and simple mechanism for regulating tilt resistance in chair seats, enhancing usability and safety through adjustable spring tension.
Implementation Method 1
the seat 2 of the chair is tiltable forwards and backwards against spring force from tilt resistance springs 3
Implementation Method 2
the springs 3 are preferably, and as shown, helical springs
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
A device at tilt mounting (1) for chair, where the seat (2) of the chair is tiltable forwards and backwards against spring force from tilt resistance springs (3), where the tilt mounting (1) has an upper part (4) which is attachable to the seat (2) of the chair and a lower part (5) which is attachable to the undercarriage (6) of the chair and tiltably connected to the upper part (4), and where tilt resistance is adjustable by adjustment of the pre-tensioning of the springs (3), wherein the distance between an upper spring seat (7) allocated the upper part (4) and a lower spring seat (8) allocated the lower part (5) is altered, wherein two lower flap-like spring seats (8) are mutually opposite tiltably arranged relative to each other for altering said distance, wherein each lower spring seat (8) is provided with a respective arm or portion (9) projecting up in operative thread connection with the thread portion (10) of a common rotatable adjusting lever (11), wherein the distance between the connection points of the arms (9) along the thread portion (10), and thus the mutually opposite tilt positions of the lower spring seat (8), is altered by rotating the adjustment lever (11).