Reversible Lock Mechanical Selector Circuit Configuration
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Solution Overview
Problem
Electromechanical reversible locks used in security and fire doors often suffer from damage during installation due to improper handling of switches and diverter switches, as technicians may use screws of incorrect lengths, leading to either ineffective circuit modification or switch damage.
Innovation Solution
A reversible lock design featuring a mechanical selector accessible from the outside, which can be moved between configurations to power or interrupt the electrical circuit, preventing direct access damage and ensuring correct installation without specific tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If switches and diverter switches are made directly accessible during installation, then the electrical circuit can be configured for specific applications, but the risk of breaking or damaging the switches increases
Solution Approach 1:
The patent introduces an intermediary mechanism (the selector with slot) that mediates between the installer and the switch. The selector can be actuated through the slot without direct access to the switch, allowing circuit configuration while protecting the switch from damage. This intermediary structure transfers the configuration function while isolating the vulnerable switch component.
2Ease of operation
If a fixing screw is used to abut against the switch for actuation, then the internal electrical circuit can be modified, but using screws of incorrect length either fails to modify the circuit or damages the switch
Solution Approach 1:
The selector is designed to be self-contained with integral actuation elements (such as a protrusion or lever) that automatically engage with the switch when the selector is moved. This self-service mechanism eliminates the need for external screws of specific lengths, as the selector itself provides the precise mechanical engagement needed for switch actuation without requiring precision tool selection.
Solution Approach 2:
The patent changes the parameter of mechanical engagement from variable (different screw lengths) to fixed (integral selector structure). The selector maintains a consistent geometric relationship with the switch, ensuring reliable actuation regardless of external tool variations. This parameter change from variable to fixed engagement resolves the tolerance issue.
3Reliability
If the selector is made accessible through a slot in the box-like body, then direct access damage is prevented, but the mechanical coupling between the selector and interruption unit must be reliable
Solution Approach 1:
The patent employs a nested structure where the selector is positioned within the box-like body and coupled to the interruption unit through a compact mechanical linkage. The slot provides external access while the internal coupling mechanism remains nested within the lock body. This nesting arrangement protects the coupling mechanism while maintaining external controllability through the slot.
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 solution allows for safe and intuitive configuration of the lock, avoiding circuit component damage and enabling easy reconfiguration, compatibility with various door types, and suitability for security and fire doors, while maintaining low costs and simplicity.
Implementation Method 1
at least one mutual coupling/uncoupling electromagnet arranged within a circuit
Data Source
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AI summary
A reversible lock (1) comprising a box-like body (2) for containing elements for moving at least one bolt (3). The movement elements are controlled by at least one actuation element with the interposition of at least one mutual coupling/uncoupling electromagnet arranged within a circuit affected by a unit (4) for interrupting the electrical continuity of a branch leading to the electromagnet. The lock (1) comprises a mechanical selector (5) which can be accessed from the outside, through a respective slot (6) of a wall (7) of the box-like body (2), and is mechanically coupled to the unit (4). The selector (5) is movable between a first configuration, in which it sets the unit (4) for conduction, supplying power to the at least one corresponding electromagnet, and a second configuration, in which it sets the unit (4) to interrupt the branch of the circuit, with the electromagnet unpowered.