Dual-Key Door Lock Layout With Shared Pin Chambers
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Solution Overview
Problem
Existing door locks with spring-loaded pins are limited to tubular designs, require internal keys, and lack versatility for external use, necessitating modifications to the door or lock components for installation and are vulnerable to common burglary techniques.
Innovation Solution
A door lock with internal and external key systems, featuring spring-loaded pins arranged parallel to the key insertion axis, allowing for universal installation without modifications and incorporating a mechanical mechanism that ensures high security through complex pin combinations resistant to common burglary methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional lock design with spring-loaded pins is used, then security function is provided, but flexibility in internal arrangement and key operation options are limited
Solution Approach 1:
The lock body is divided into separate functional modules: a first chamber for internal key operation, a second chamber for external key operation, and a common pin chamber. This segmentation allows independent arrangement of internal and external key mechanisms while maintaining shared pin components, providing flexibility without excessive complexity.
Solution Approach 2:
The lock is designed with multi-functionality to accommodate both internal key operation and external key operation within a single device. The universal pin chamber serves both key types, and the movable equipment can be actuated by either key, making the lock adaptable to different locking scenarios.
2Reliability
If lock requires modifications to door or components for installation, then secure locking function is achieved, but installation complexity and time are increased
Solution Approach 1:
The lock is designed as a self-contained unit with all necessary components (chambers, pins, springs, movable equipment) integrated into the lock body itself. This self-service design eliminates the need for modifications to the door or existing locking components, allowing direct installation without requiring changes to the door structure or hardware.
3Adaptability or versatility
If internal key is added to existing lock, then key operation options are increased, but device complexity is increased
Solution Approach 1:
The internal key chamber and external key chamber are merged into a single lock body with shared pin components. The movable equipment serves both key types, and the pin chamber is common to both operations. This merging approach provides multiple key operation options while minimizing the increase in overall device complexity through component sharing.
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
The lock provides enhanced security by allowing internal and external key operation without altering the door, offering thousands of unique combinations resistant to traditional burglary techniques and eliminating the need for multiple keys and costly replacements.
Implementation Method 1
a multiplicity of springs positioned in the movable equipment parallel to the insertion direction of the key and individually provided with a head; and a plurality of pins, each pin, loaded by a spring of said plurality of springs
Data Source
AI summary
A door lock has a body (1) equipped with an internal chamber (2), an external chamber (3) and an interspace containing a mobile unit (4) having an internal cam (40) suitable for receiving and retaining a inner key end, and an external cam (41) adapted to receive and retain an outer key end. A plurality of springs (13) are positioned in the inner chamber (2) in passages parallel to the direction of insertion of the keys; pins (15) of a plurality of pins (15), loaded by respective springs (13) of said plurality of springs (13), are slidable in respective passages extending into the inner chamber (2), in the interspace and in the outer chamber (3) along a direction parallel to the key insertion direction. The external key can be modified to open locks of this type.