Door Lock Rotary Assembly for Fast Alignment on Thin Doors
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Solution Overview
Problem
Conventional door locks require time-consuming alignment of internal components during installation due to the need for precise rotation of the drive shaft, and thinner doors increase resistance, making operation difficult.
Innovation Solution
A rotary locked structure with a pre-assembled driving part, inner tube, and shaft that includes restriction and positioning units, allowing for easy alignment and reduced rotational resistance by modular design and spring-assisted movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the drive shaft and inside tube are installed separately requiring alignment, then the door lock can be assembled, but the installation process becomes time-consuming and complex
Solution Approach 1:
The patent combines the drive shaft and inside tube into a pre-assembled unit with integrated positioning structures. The drive shaft includes positioning protrusions that align with corresponding grooves on the inside tube, allowing the entire assembly to be installed as one unit rather than requiring separate alignment operations, thereby reducing installation time and complexity
Solution Approach 2:
The drive shaft and inside tube are pre-assembled in the factory with positioning features already integrated. This preliminary assembly ensures proper alignment is built-in before installation, eliminating the need for time-consuming on-site alignment operations and ensuring correct positioning is achieved automatically during installation
2Adaptability or versatility
If the spring is mounted on the drive shaft for thinner doors, then the door lock can accommodate varying door thicknesses, but the rotational resistance increases significantly
Solution Approach 1:
The patent applies local quality by positioning the spring mounting location specifically on the drive shaft at a distance from the rotation axis. This localized placement allows the spring to compensate for door thickness variations without creating excessive rotational resistance, as the spring force is applied at an optimal point that minimizes torque requirements while maintaining adaptability to different door thicknesses
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
Facilitates quick and easy installation of door locks on doors of varying thicknesses by eliminating the need for precise alignment and reducing rotational resistance, enhancing operational efficiency.
Implementation Method 1
A first spring biases one end of the inner tube so as to push the inner tube toward the driving part
Data Source
AI summary
A rotary locked structure of a door lock includes a tubular driving part and connected to a first knob. The driving part includes a restriction portion. An inner tube is received in the driving part and has a positioning portion located corresponding to the restriction portion to restrict rotational movement of the inner tube in the driving part. A restriction unit is formed axially in the inner periphery of the inner tube. A shaft includes a connection portion that includes a positioning unit located corresponding to the restriction unit to restrict rotational movement of the shaft in the inner tube. The driving part, the inner tube and the shaft are pre-assembled in factories. The inner tube and the shaft are not limited to be engaged in only one direction. The spindle and driving column can be directly connected to the inner tube and the shaft without rotating the inner tube and shaft.