Device for adjusting the slope of the seat base of a seat
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Solution Overview
Problem
Existing seat inclination adjustment mechanisms in office chairs lack continuous adjustment capabilities, typically offering only discrete operation with limited angular positions, which may not provide sufficient ergonomic flexibility for users.
Innovation Solution
A device comprising a base frame with longitudinal angles and transverse shafts, eccentric disk cams, and manual control means allows for two stable angular positions, with the weight of the user reinforcing positional stability through specific profile designs and lug interactions, enabling easy assembly and secure maintenance in inclined positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If discrete adjustment with limited angular positions is used, then device complexity is reduced, but ergonomic flexibility is insufficient
Solution Approach 1:
The patent implements a dynamic adjustment mechanism where the seat base can be tilted between multiple angular positions (at least three positions including fully retracted, partially retracted, and fully extended). This dynamic capability allows the seat to adapt to different ergonomic requirements while maintaining a relatively simple mechanical structure based on telescopic legs with cam-based locking mechanisms.
2Ease of manufacture
If simple mechanical plate is used, then assembly is facilitated, but positional stability is insufficient
Solution Approach 1:
The adjustment mechanism is segmented into distinct functional components: telescopic legs for position adjustment, cam mechanisms for locking, and follower lugs with profiles for stability. Each segment performs a specific function, making the overall system both simple to manufacture and highly stable in its locked positions.
Solution Approach 2:
The cam mechanisms utilize curved profiles and circular arcs to create stable locking positions. The follower lugs engage with cam profiles that have specific curvature characteristics, ensuring that the seat base remains firmly locked at each angular position while allowing smooth transitions between positions.
3Reliability
If user weight is used to reinforce stability, then reliability is improved, but mechanism complexity increases
Solution Approach 1:
The mechanism is designed so that the user's own weight automatically reinforces the stability of the locked position. When the user sits on the seat, their weight creates forces that press the follower lugs against the cam profiles, locking the mechanism in place. This self-reinforcing feature improves reliability without requiring additional active components or complex control systems.
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 stable and adjustable seat inclination with reinforced positional stability, allowing users to easily switch between two predefined angles, enhancing ergonomic comfort and usability.
Implementation Method 1
at least two cams attached to a rotating shaft controlled by manual control means... each comprising at least one external profile and at least one internal profile... at least one first profile of each cam includes at least one retaining stop in the first angular position, and at least one second profile includes at least one retaining stop in the second angular position
Data Source
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AI summary
The invention relates to a device for adjusting the inclination of the seat base of a seat with respect to a means of support of the seat base mounted on top of the seat leg, and comprising: - a base frame of the padded seat, comprising two longitudinal brackets and two transverse shafts connecting the brackets; - at least two cams (4, 4') rigidly attached to a rotary shaft controlled by manual control means; comprising eccentric disc shafts (4, 4') each interacting with at least two follower lugs (10, 11) projecting from the brackets and having at least one outer profile (6) and at least one inner profile (7) for guiding the lugs (10, 11).