Door Lock Outer Operational Device Handle Limiting Mechanism
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Solution Overview
Problem
Existing door lock mechanisms are prone to component deformation or damage due to improper operation, particularly when excessive force is applied to the handle in the locking state, compromising their functionality and security.
Innovation Solution
An outer operational device for a door lock featuring a cover with guide pins, a pivotable spindle, and a sliding block mechanism that includes a spring and a locking member, allowing for controlled movement of the handle and latch operation without excessive force, thereby protecting the components from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle is made operable in the locking state for easy access, then ease of operation is improved, but components connected to the handle may deform or be damaged due to excessive force
Solution Approach 1:
The patent introduces a limiting mechanism that performs preliminary action by restricting the handle's rotation range before excessive force can be applied. The limiting plate with its specifically shaped limiting surface intervenes in the motion path, preventing the handle from rotating beyond a safe angle and thus protecting connected components from deformation or damage while still allowing convenient operation within the permitted range.
2Ease of operation
If the handle rotation range is increased for better operability, then ease of operation is improved, but the risk of component damage increases
Solution Approach 1:
The patent applies preliminary anti-action by introducing a limiting mechanism that counteracts the potential harmful effect of excessive handle rotation before it can occur. The limiting plate's limiting surface actively prevents the handle from rotating beyond the safe range, neutralizing the risk of component damage while preserving the benefits of improved handle operability within the controlled range.
3Reliability
If a limiting mechanism is added to protect components, then component reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the limiting function with the existing handle mechanism by integrating the limiting plate into the overall assembly. The limiting plate is positioned to work in conjunction with the handle's rotation path, combining the protection function with the existing operational mechanism rather than adding a completely separate system, thus minimizing the increase in device complexity.
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 ensures reliable and secure operation of the door lock by preventing component damage and maintaining the latch in the correct position, even when the handle is pivoted, ensuring the latch remains in the intended position whether locked or unlocked.
Implementation Method 1
A spring has two ends respectively abutting against the wing of the limiting plate and the leg, with the spring biasing the sliding block from the upper position to the lower position.
Data Source
AI summary
An outer operational device (13) for a door lock includes cover (20) receiving a sliding block (511) and a handle (197) operatively connected to the sliding block (511). The sliding block (511) includes a sliding groove (525) having a horizontal section (528) slideably receiving a locking member (541). A driving member (44) is fixed to a connection member (595) in the cover (20) and is operatively connected to a latch (124). When the locking member (541) is in a first position, pivotal movement of the handle (197) drives the sliding block (511) to actuate the connection member (595) and the driving member (44) to retract the latch (124). When the locking member (541) is in the second position, the sliding block (511) is moved without actuating the connection member (595) when handle (197) is pivoted, and the latch (124) remains in the latching position.