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, especially on thinner doors, leading to increased rotational resistance and poor operability due to spring compression.
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 installation by preventing rotational movement until the door lock is secured, reducing the need for manual adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drive shaft and inside tube are rotated to align during installation, then the inside knob and outside knob can be mechanically connected, but it takes time and requires try and error repeatedly
Solution Approach 1:
The patent applies preliminary action by pre-assembling the drive shaft and inner tube in the factory with their relative positions fixed. The drive shaft is installed to the inside tube in the factory, and the inside knob can be freely rotated and does not have a proper restriction structure. When installing the inside knob and the outside knob, the drive shaft and the inside tube have to rotated to align the inside tube with the spindle connected to the outside knob
Solution Approach 2:
The patent uses asymmetry through the positioning portion and restriction portion design. The positioning portion is located at a specific angular position on the inner tube, and the restriction portion is correspondingly positioned on the drive shaft, creating an asymmetric configuration that allows only one correct rotational alignment position
2Adaptability or versatility
If the spring is mounted to the drive shaft on thinner doors, then the door lock can be installed, but the spring is greatly compressed resulting in increased rotational resistance
Solution Approach 1:
The patent applies segmentation by dividing the locking mechanism into separate functional components: the drive shaft for rotation, the inner tube for positioning, and the spring for biasing. This segmentation allows the spring to be positioned separately from the rotational path of the drive shaft, reducing interference
Solution Approach 2:
The inner tube acts as an intermediary between the spring and the drive shaft. The spring is mounted to bias the inner tube axially, and the inner tube transmits this force to the locking mechanism without requiring the drive shaft itself to be directly biased, thus reducing rotational resistance
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 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 shaft without rotating the inner tube and shaft.