Door Lock Knob Assembly With Guided Insertion for Precise Fitting
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Solution Overview
Problem
The positioning of a bar-shaped door lock knob in a tubular holder is difficult due to similar diameters, requiring multiple attempts for proper fitting.
Innovation Solution
A door lock assembly with a lock knob holder featuring two holes and an insertion guide portion with a widening guide surface facilitates easy mounting of the door lock knob, allowing it to be guided smoothly into position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the door lock knob is inserted directly into the holder without a guide portion, then the structure remains simple, but positioning becomes difficult and requires multiple attempts
Solution Approach 1:
The insertion guide portion is prepared in advance on the holder, creating a predetermined path that guides the door lock knob during insertion. This preliminary structural preparation eliminates the need for multiple positioning attempts while adding minimal complexity to the overall assembly.
2Ease of operation
If the hole opening size is made larger to facilitate insertion, then insertion becomes easier, but positioning precision deteriorates
Solution Approach 1:
The insertion guide portion creates a localized tapered region with different geometric properties than the main hole. The tapered section provides a gradual entry that is easy to insert into, while the lower section maintains the precise fit required for accurate positioning, thus combining ease of insertion with positioning precision in different local regions.
Solution Approach 2:
The insertion guide portion introduces a dimensional transition from a wider upper opening to a narrower lower opening. This dimensional change along the insertion axis allows the knob to be easily guided into position at the wider end while achieving precise fitting at the narrower end, effectively solving both requirements through spatial variation.
Data Source
AI summary
A door lock assembly includes a door trim including a through hole, and a locking device that is disposed on a vehicular exterior side with respect to the door trim and locks and unlocks a vehicular door. The locking device includes a lock knob holder and a door lock knob. The lock knob holder has a tubular shape and two holes at two opposite ends and one of the two holes is adjacent to the through hole and another one is an insertion hole. The door lock knob has a bar shape and is disposed in the lock knob holder so as to be movable between an unlocked position and a locked position. The door lock assembly further includes an insertion guide portion disposed adjacent to the insertion hole and includes a guide surface having a width that increases as it extends away from the insertion hole.