Cabinet Snap Fit Lock Mechanism for Automatic Drawer Locking
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Solution Overview
Problem
Existing file cabinet designs require users to perform two separate actions to lock a drawer: sliding it into the closed position and then using a key lock, and the drawer cannot be locked unless it is fully closed, making the process cumbersome and inconvenient.
Innovation Solution
A cabinet with a snap fit lock mechanism that automatically locks the drawer when it reaches the closed position, using a movable locking member and actuator to engage and disengage the lock, allowing for easier locking and unlocking without requiring the drawer to be fully closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a key lock mechanism is used to lock the drawer, then the drawer can be securely locked, but the user must perform two separate actions (close the drawer and then use the key lock)
Solution Approach 1:
The patent combines the closing action and locking action into a single integrated mechanism. When the drawer is closed, the cam automatically engages with the locking member through the cam track geometry, so that the single action of closing the drawer simultaneously achieves both closure and locking. This eliminates the need for a separate key locking action while maintaining security.
Solution Approach 2:
The locking mechanism is designed to automatically lock the drawer upon closing without requiring user intervention. The cam and cam track arrangement creates a self-actuating system where the drawer's own closing motion drives the locking engagement, making the system self-servicing rather than requiring external key operation.
2Reliability
If a key lock mechanism is used, then the drawer can be locked securely, but the drawer cannot be locked if it has not reached the closed position
Solution Approach 1:
The locking mechanism transitions from a static key-lock system to a dynamic cam-based system that responds to drawer position. The cam track geometry allows the locking member to engage at various points along the cam's rotation path, enabling locking at multiple drawer positions rather than requiring the drawer to be fully closed. This dynamic engagement provides both security and positional flexibility.
Solution Approach 2:
The system changes the parameter of locking engagement from a fixed position (fully closed) to a variable position along the cam track. By varying the cam rotation angle and the position of the locking member engagement point on the cam track, the system allows locking to occur at different drawer positions, adapting to different user needs while maintaining secure locking.
3Reliability
If a bar sliding in a notch mechanism is used, then the drawer can be locked, but the user must ensure the drawer is fully closed before using the key lock
Solution Approach 1:
The cam mechanism automatically performs the locking function as the drawer is closed, eliminating the need for separate user actions. The cam's geometric design ensures that the locking member engages with the locking surface at the appropriate moment during the closing motion, making the system self-regulating and removing the burden of user judgment about drawer position.
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
Enables easier and more convenient locking of drawers by allowing them to be secured in the closed position automatically, eliminating the need for two separate actions and ensuring the drawer can be locked at any position, enhancing user experience and security.
Implementation Method 1
a resilient member arranged for urging the said one locking member towards the engaged position
Data Source
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AI summary
The invention deals with a cabinet comprising: a housing (2), a first drawer (4a) arranged to slide relative to the housing (2) between an open position and a closed position, a first snap fit lock mechanism for locking automatically the first drawer (4a) to the housing (2) when the first drawer (4a) reaches the closed position, so as to retain the first drawer (4a) in the closed position, and an actuator (64, 65) for causing the first snap fit lock mechanism to unlock the first drawer (4a) from the housing (2), so as to allow the first drawer (4a) to leave the closed position.