Door Lock Cover Cap Axial Fixation Mechanism
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Solution Overview
Problem
Conventional door locking systems have a design flaw where cover caps can be easily removed, providing unauthorized access and risking damage to the system or the door handle, particularly in publicly accessible environments like schools.
Innovation Solution
A door locking system with a one-piece cup-shaped cover cap that is axially fixed to the mounting plate and rotatably connected to the door handle, featuring a threaded connection that requires the door handles to be securely attached via a polygonal pin before the cover cap can be removed, ensuring it cannot be unscrewed from the mounting plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cover cap is made removable from the mounting plate, then ease of operation is improved, but security and protection are worsened
Solution Approach 1:
The cover cap's state transitions from removable to fixed based on the door handle assembly state. When the door handle is properly assembled with the mounting plate, the cover cap becomes axially fixed and cannot be removed. When the door handle is disassembled, the cover cap becomes removable again. This dynamic behavior resolves the contradiction by making the system secure during normal operation while still allowing access when needed.
Solution Approach 2:
The system prevents unauthorized removal of the cover cap by establishing a preliminary condition: the door handle must be properly assembled with the mounting plate before the cover cap can be removed. This preliminary anti-action blocks the harmful effect of unauthorized access while preserving legitimate access when the door handle is intentionally disassembled.
2Reliability
If the cover cap is firmly fixed to the mounting plate, then security and protection are improved, but ease of operation is worsened
Solution Approach 1:
The cover cap transitions between fixed and removable states based on the door handle assembly condition. During normal operation when the door handle is assembled, the cover cap is firmly fixed providing security. When the door handle is disassembled for maintenance or replacement, the cover cap becomes removable again, restoring ease of operation.
Solution Approach 2:
The door handle assembly acts as an intermediary mechanism between the cover cap and mounting plate. It mediates the relationship by controlling whether the cover cap is fixed or removable based on its own assembly state, thus resolving the contradiction between security and ease of operation.
3Ease of operation
If the cover cap can be freely removed, then ease of operation is improved, but damage risk is worsened
Solution Approach 1:
The system applies preliminary anti-action by preventing cover cap removal unless the door handle is properly assembled with the mounting plate. This blocks the harmful effect of accidental loosening or damage to the door handle while still allowing intentional removal when the door handle is deliberately disassembled for maintenance.
Solution Approach 2:
The system converts the potential harm of unauthorized cover cap removal into a benefit by making removal conditional on proper door handle assembly. The condition that previously seemed restrictive actually protects the system by ensuring that only properly assembled configurations allow cover cap removal, thereby preventing damage while maintaining accessibility.
4Ease of operation
If the cover cap is axially fixed to the mounting plate only, then ease of operation is improved, but stability is worsened
Solution Approach 1:
The cover cap's fixation is merged with the door handle assembly state. Instead of being independently fixed or removable, the cover cap's fixation status is combined with the door handle's assembly status. When the door handle is assembled, the cover cap becomes fixed; when the door handle is disassembled, the cover cap becomes removable. This merging resolves the contradiction by linking ease of operation with stability through a unified condition.
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
Prevents unauthorized access and damage by securing the cover cap to the mounting plate until the door handles are properly fixed, enhancing the system's stability and external appearance while preventing accidental loosening or removal.
Implementation Method 1
The cover cap has a thread circumferential to the pivot axis, and the first mounting plate has a mating thread circumferential to the pivot axis. The cover cap and the first mounting plate are then screwed together.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a door locking system (1) for opening and closing a door. The door locking system (1) comprises a first door handle unit (2a) with a first door handle (3a) and a cover cap (7), and a second door handle unit (2b) with a second door handle (3b). The door locking system (1) also includes a first mounting plate (4a) and a second mounting plate (4b), which are axially and rotationally fixed to one another. The respective door handle unit (2a, 2b) is axially fixed to the respective mounting plate (4a, 4b). According to the invention, the cover cap (7) is axially fixed to the first mounting plate (4a) and axially fixed and rotatable to the first door handle (3a). Furthermore, the cover cap (7) can only be axially detached from the first mounting plate (4a) together with the first door handle (3a).