Interlocking Lock Case Synchronizes Anti-Theft Latch Operation
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Solution Overview
Problem
Existing lock cases with anti-theft latches require separate operations to move between anti-theft and non-anti-theft positions, causing inconvenience in use.
Innovation Solution
A lock case design featuring an interlocking mechanism with an anti-pick member, connecting member, and unlocking spring that allows simultaneous movement of the latch to the unlatching position and anti-theft latch to the non-anti-theft position without separate operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anti-theft latch is added to provide additional security, then the security level is improved, but the operational complexity increases and convenience deteriorates
Solution Approach 1:
The patent combines the latch and anti-theft latch into a unified locking system where both functions are integrated within the same lock case. The connecting member mechanically links the latch and anti-theft latch, allowing them to be controlled together through a single operation device, thus maintaining high security while simplifying user operation.
Solution Approach 2:
The unlocking spring automatically returns the anti-theft latch to its initial position after the connecting member retracts, eliminating the need for manual intervention to reset the anti-theft latch. This self-resetting mechanism improves operational convenience while maintaining the security function.
2Reliability
If the anti-theft latch is moved to the anti-theft position to prevent unauthorized opening, then the security against picking is improved, but the ease of operation deteriorates as separate operation is required
Solution Approach 1:
The operating device is designed to simultaneously control both the latch and anti-theft latch through a single operation. When the operating device is actuated, it moves the connecting member which in turn moves both the latch and anti-theft latch together, allowing users to switch between secured and unlocked states with one action rather than two separate operations.
Solution Approach 2:
The system dynamically adjusts the position of the anti-theft latch based on the state of the latch. When the latch is moved to the unlatching position, the connecting member automatically moves the anti-theft latch to the non-anti-theft position, and vice versa. This dynamic coupling ensures that both security functions respond together to user input, maintaining simplicity while providing robust anti-pick protection.
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
Provides convenient use by allowing the latch to move to the unlatching position while the anti-theft latch moves to the non-anti-theft position automatically, enhancing security and usability.
Implementation Method 1
an unlocking spring disposed in the case body and biasing the anti-theft latch towards the non-anti-theft position
Data Source
AI summary
A lock case interlockable with an anti-theft latch is mounted on a door. The lock case includes a latch coupled with a latch hole in a door frame for retaining the door in a closed position. The anti-theft latch can be operated to engage with the door frame. When the latch is picked, the anti-theft latch still remains engaged with the door frame to prevent opening of the door. When normally operated, an inner operating device or an outer operating device can be operated to disengage the latch from the latch hole while disengaging the anti-theft latch from the door frame, permitting easy, convenient opening of the door.