Two-Part Quarter-Turn Locking Device for Tool-Free Assembly
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Solution Overview
Problem
Conventional quarter-turn locking devices for door leaves are costly and time-consuming to assemble due to the need for tools and complex mounting processes, leading to high assembly costs when repeated.
Innovation Solution
A two-piece locking device structure with a manipulation head and locking cam, where the first part pivots relative to the leaf wall, and the second part is assembled to sandwich the wall, allowing for easy assembly without tools and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional quarter-turn locking device with at least three elements (main body, locking cam, mounting nut) is used, then the locking function is reliable, but the assembly process requires tools and consumes significant time, leading to high assembly costs
Solution Approach 1:
The locking device is divided into two main parts: a first part comprising the manipulation head and locking cam, and a second part that sandwiches the leaf wall. This segmentation allows for simpler, tool-free assembly while maintaining the reliable locking function through the coordinated interaction of these parts
Solution Approach 2:
The mounting function is integrated directly into the two-part structure itself, eliminating the need for a separate mounting nut. The second part serves both as a mounting component and as part of the locking mechanism, reducing the total number of components and simplifying assembly
2Reliability
If a conventional locking device with multiple components is used, then the locking mechanism is robust, but the device complexity increases and manufacturing costs rise
Solution Approach 1:
By segmenting the device into two functional parts rather than three or more separate components, the patent reduces device complexity while maintaining reliability through the specific design of each part's function and their coordinated interaction
Solution Approach 2:
The two parts are designed to perform multiple functions: the first part provides manipulation and locking cam functions, while the second part serves as both a mounting component and structural element. This multi-functionality reduces the overall number of components needed
3Manufacturing precision
If a conventional locking device requiring tool-based assembly is used, then precise mounting is achievable, but assembly costs increase significantly when repeated many times
Solution Approach 1:
The two-part structure is designed to self-align and self-mount without requiring external tools. The parts work together to achieve precise mounting through their inherent geometric compatibility and assembly features, eliminating the need for tool-based precision mounting procedures
Data Source
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AI summary
The device (100) has a piece (110) constituted of an operating head (112), a body (114) and a locking cam (116). Another piece (130) is assembled at the former piece, such that the head and the latter piece hook a wall (150) of a doorleaf, and the former piece is freely pivoted with respect to the wall of the doorleaf, when the device is assembled. The former piece has a stop unit for limiting a rotation course of the cam with respect to the wall to quarter turn.