Length Adjustable Door Lock Assembly

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Solution Overview

Problem

Conventional length adjustable door locks have complex structures and difficult assembly processes, making them challenging to manufacture and assemble effectively for various door thickness specifications.

Innovation Solution

A door lock design featuring a latch assembly with an 'H'-shaped embedding opening, a lock core with matching slots, and a lock bolt with buckling ribs, allowing for easy length adjustment by sliding the bolt within a sleeve, simplifying the assembly and linking structures between the lock core and bolt.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional length adjustment structures are used, then the door lock can fit different door thickness specifications, but the structure becomes complicated and difficult to assemble

Engineering Contradiction:

Improveadaptability to different door thicknessVSAvoidstructure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The door lock body is divided into multiple segments including a first lock body portion, a second lock body portion, and a buffer portion. These segments can be independently positioned and connected through embedding portions and slots, allowing length adjustment without requiring a completely complex reconfiguration mechanism. Each segment serves a specific function and can be assembled separately.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs a nested structure where embedding portions are integrated within the lock body segments, and connecting ribs fit into embedding slots. The buffer portion is nested between the first and second lock body portions, creating a compact multi-functional assembly that adjusts length through nested component interaction rather than external adjustment mechanisms.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

If conventional length adjustment structures are used, then the door lock can fit different door thickness specifications, but the assembling process becomes difficult

Engineering Contradiction:

Improveadaptability to different door thicknessVSAvoidassembling ease

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The embedding portions and embedding slots are pre-formed during manufacturing with precise geometries. The connecting ribs are pre-positioned on the buffer portion and lock body portions. This preliminary preparation of connection interfaces eliminates the need for complex field assembly operations, allowing workers to simply align and press-fit components together during installation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The connecting ribs automatically align with and engage into the embedding slots through the designed geometric interfaces. The buffer portion self-positions between the lock body portions through the embedding structure, eliminating the need for complex fastening operations or specialized assembly tools. The structure assembles itself through inherent geometric constraints.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11643847B2Length adjustable door lock

Publication Date: 2023.05.09 CHEN JEFF

AI summary

A length adjustable door lock includes a latch assembly, a lock core connected with the latch assembly, a lock bolt connected with the lock core, and a housing sleeved on the lock bolt. The latch assembly and the lock core respectively have an embedding opening and slot having matchable shape, wherein a buckling portion is formed and provided on the lock bolt coordinately, wherein the buckling portion is adapted for being assembled in the slot of the lock core through the embedding opening, which is easy for the assembling.