Rotational Locking Device for Play-Free Seating Furniture Adjustment
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Solution Overview
Problem
Existing locking devices for office chairs often result in rattling noises and play due to linear guides, which are difficult to manufacture and install, and require significant space.
Innovation Solution
A locking device with a first and second locking component that engage through rotational movement, eliminating the need for linear guides and allowing for silent locking without play, using a pivotally mounted locking body and an actuating element with a transmission element to manage the locking and unlocking positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If linear guides are used for the locking body, then the locking device can guide the locking body, but it causes rattling noises and play
Solution Approach 1:
The patent replaces the linear guide mechanism with a rotational movement system. The locking body rotates about an axis instead of moving linearly within guides, eliminating the guide structures that cause rattling and play. This substitution of mechanical movement type resolves the noise issue while maintaining locking reliability.
2Reliability
If linear guides with parallel guide surfaces are used, then the locking body can be guided, but it requires significant installation space
Solution Approach 1:
The patent transitions from linear guidance in one dimension to rotational movement in a different dimensional approach. The locking body rotates about an axis rather than moving linearly, which changes the spatial requirements and reduces the installation space needed for guiding structures.
3Manufacturing precision
If linear guides are used to minimize play, then locking without play is achieved, but it increases device complexity and manufacturing difficulty
Solution Approach 1:
The patent replaces complex linear guide structures with a simpler rotational mechanism. The locking body rotates about an axis defined by two parallel pins, eliminating the need for complex linear guides while achieving precise locking without play. This reduces both manufacturing complexity and device complexity.
4Reliability
If linear guides are used for the locking body, then the locking function can be implemented, but it increases the number of parts and assembly difficulty
Solution Approach 1:
The patent replaces multiple linear guide components with a simplified rotational system using two parallel pins and a rotating locking body. This substitution reduces the number of parts and simplifies assembly, as the rotational movement is inherently constrained by the two pins without requiring additional guide structures.
Data Source
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AI summary
The invention relates to a locking device for locking a first component of a piece of seating furniture relative to a second component of the seating furniture. To provide a piece of seating furniture with a locking device that enables backlash-free locking, a locking device (15) is proposed, comprising a first locking component (16) attached or attachable to the first component (5) and a second locking component (18) that can engage with the first locking component (16) for the purpose of locking and disengage for the purpose of unlocking, for which purpose the first locking component (16) and/or the second locking component (18) can be moved from a locked position to an unlocked position and back again by performing a rotary movement.