Adjustable Marking Fixture for Door Lock Recess Alignment
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Solution Overview
Problem
Existing marking fixtures are not adaptable for use with doors of varying thicknesses and types, such as square edge and lipped doors, as they do not account for the different positions and depths of insert lock recesses and faceplate recesses.
Innovation Solution
A marking fixture comprising an L-shaped profile part with a short leg for the door end side and a long leg for the main surface, featuring an adjustable connection between the fitted plate and the short leg, allowing perpendicular displacement, enabling accurate marking of drill hole positions for door handles, lock cylinders, and WC/latch holes on doors with centrally or eccentrically positioned recesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed marking fixture is used, then the marking position is stable and precise, but the fixture cannot be used with doors of different thicknesses and types
Solution Approach 1:
The marking fixture incorporates an adjustable connection between the fitted plate and the short leg of the L-shaped profile part, allowing the fitted plate to be displaced in a direction perpendicular to the long leg. This dynamic adjustment capability enables the fixture to adapt to doors of different thicknesses and types (square edge doors with central recesses or lipped doors with eccentric recesses) while maintaining stable and accurate marking positions through the constrained degrees of freedom
Solution Approach 2:
The adjustable connection allows changing the distance parameter between the fitted plate and the long leg of the L-shaped profile part. By adjusting this parameter, the fixture can accommodate varying door thicknesses and recess positions, enabling universal application across different door types while preserving marking precision through the defined geometric relationships
2Adaptability or versatility
If a universal marking fixture is designed, then it can accommodate different door configurations, but the device complexity increases
Solution Approach 1:
The fixture uses a simple adjustable connection mechanism with constrained movement (exclusively perpendicular displacement) rather than complex multi-axis adjustment systems. This dynamic but limited freedom of movement provides adaptability to different door types while keeping the structural complexity low and the operation straightforward
Solution Approach 2:
The L-shaped profile part with fitted plate creates a universal marking fixture that can be used with both square edge doors (central recess) and lipped doors (eccentric recess). The single adjustable connection design serves multiple functions: accommodating thickness variations, adapting to different recess positions, and maintaining marking accuracy across all door types without requiring multiple specialized fixtures
Data Source
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AI summary
A marking fixture for marking positions of drill holes on a door, wherein the door in its end side is provided with a recess for an insert lock and a recess for a faceplate of the insert lock. The marking fixture includes an L-shaped profile part and a fitted plate. The L-shaped profile part includes a short leg intended for abutment against the end side of the door and a long leg intended for abutment against a main surface of the door. The long leg is provided with at least one marking opening for marking a position of a drill hole. The fitted plate is connected with the short leg by means of an adjustable connection and is fittingly receivable in the recess for the faceplate. The adjustable connection exclusively allows displacement of the fitted plate in a direction perpendicular to the long leg.