Door Lock Support Structure for Tailpiece Swing
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Solution Overview
Problem
Conventional door lock assemblies are vulnerable to unauthorized removal of the handle from the spindle tube due to insufficient support from the tailpiece when the key-operated lock is in the locking position, as external forces can cause the tailpiece to swing and dislodge the retaining plate from its retention slot.
Innovation Solution
A door lock assembly with a novel support structure that includes a tailpiece with diametrically opposite edges, where one edge abuts the support part and the other abuts the stabilizing part of the retaining plate, preventing it from moving away from the retention slot when the lock is in the locking position, ensuring secure attachment of the handle to the spindle tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the tailpiece is used to support the retaining plate in the locking position, then the structure is simple, but the retaining plate can be dislodged by external forces due to tailpiece swing
Solution Approach 1:
A support structure is introduced as an intermediary component between the tailpiece and the retaining plate. The support structure includes a support body with a support surface that abuts against the retaining plate, while the tailpiece abuts against the support structure. This intermediary structure prevents the tailpiece from directly supporting the retaining plate, eliminating the swing issue while maintaining structural simplicity.
Solution Approach 2:
The support function is segmented into two distinct components: the tailpiece and the support structure. The tailpiece remains responsible for actuating the locking mechanism, while the support structure is specifically dedicated to providing stable support for the retaining plate. This segmentation allows each component to perform its function optimally without interference.
2Ease of operation
If the retaining plate is biased by a spring to project into the retention slot, then the handle can be easily detached when needed, but the handle can be undesirably removed by external forces when the lock is in the locking position
Solution Approach 1:
The support structure is positioned to preemptively counteract external forces that might attempt to dislodge the retaining plate. When the lock is in the locking position, the support structure's support surface abuts against the retaining plate, creating a preliminary anti-action that prevents unauthorized removal before it can occur.
Solution Approach 2:
The system dynamically adjusts the support mechanism based on the locking state. When the key plug is rotated to the locking position, the tailpiece engages with the support structure, which then provides rigid support to the retaining plate. When the key plug is rotated to the unlocking position, the support is released, allowing easy detachment. This dynamic behavior resolves the contradiction between security and ease of operation.
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 support structure effectively prevents the handle from being removed undesirably from the door lock assembly, enhancing security by maintaining the retaining plate in the retention slot even under external forces, thus preventing unauthorized detachment.
Implementation Method 1
a spring (52) disposed inside the spindle tube (5) and biasing the retaining plate (51)
Implementation Method 2
one of the edges of the tailpiece abuts against the support part, and the other one of the edges abuts against the stabilizing part to prevent the retaining tongue from moving away from the retention slot
Data Source
AI summary
A door lock assembly includes a transverse retaining plate disposed inside a spindle tube and having a stabilizing part and a retaining tongue projecting into a retention slot in a handle. A support structure is disposed within the handle oppositely of the retention slot and has a support part extending radially into the spindle tube. When the door lock assembly is in a locking state and when the retaining tongue in the retention slot is pressed externally, one of two diametrically opposite edges of a tailpiece of a key plug abuts against the support part, and the other one of the edges abuts against the stabilizing part of the retaining plate to restrict the retaining tongue from moving away from the retention slot, thereby preventing undesirable removal of the handle from the door lock assembly.