Elevator Car Door Locking Mechanism Eliminates Floor Cams
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Solution Overview
Problem
Conventional elevator car door locking apparatuses require unlocking cams on all floors, increasing manufacturing and installation costs, especially for elevators with a large number of floors.
Innovation Solution
An elevator car door apparatus with a blade-carrying car door, a doorstop-side blade, a locking member, a fixed latch, and a guiding cam, where the doorstop-side blade is constantly subjected to a force toward the locking accommodating position, and the locking member is held in the unlocked position until the car is positioned outside an appropriate floor alignment, allowing the locking member to catch in the fixed latch and prevent door opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unlocking cams are installed on all floors to prevent car door opening, then door opening prevention reliability is improved, but manufacturing cost and installation burden increase
Solution Approach 1:
The invention extracts the essential function of door locking from the floor-dependent unlocking cam system and relocates it to a fixed latch system mounted on the car door itself. The locking member with guiding portion interacts with the fixed latch to provide automatic locking when the car door is closed, eliminating the need for unlocking cams on each floor while maintaining door opening prevention capability.
Solution Approach 2:
The fixed latch and locking member system serves multiple functions: it automatically locks the car door when closed, prevents door opening between floors, and integrates with the existing door closing mechanism. The guiding cam and guiding portion work together to ensure proper engagement without requiring additional floor-specific components.
2Device complexity
If a simple door opening prevention mechanism is used, then device complexity is reduced, but door opening prevention reliability may worsen
Solution Approach 1:
The locking member is designed to dynamically change position based on car door movement. When the car door closes, the guiding portion moves along the guiding cam, automatically driving the locking member into the locked position where it engages with the fixed latch. This dynamic automatic locking ensures reliability without requiring complex control systems.
Solution Approach 2:
The fixed latch is pre-positioned on the car door to engage with the locking member before any forced opening attempt can occur. The guiding cam is designed to ensure the locking member is already in the engaged position with the fixed latch when the door is closed, creating a preliminary barrier against unauthorized door opening.
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
This configuration prevents car door opening between floors without the need for unlocking cams on every floor, reducing manufacturing and installation burdens and maintaining a simple door opening prevention mechanism.
Implementation Method 1
a guiding cam that is disposed on an external portion of the blade-carrying car door; and a guiding portion that is disposed on the locking member, wherein: the doorstop-side blade is constantly subjected to a force toward the locking accommodating position; the locking member is held in the unlocked position, and the doorstop-side blade is also held in the unlocking accommodating position, by the guiding portion contacting the guiding cam when the blade-carrying car door is in a fully closed state
Implementation Method 2
the doorstop-side blade is constantly subjected to a force toward the locking accommodating position
Implementation Method 3
a fixed latch that is disposed outside the blade-carrying car door, and that stops movement of the blade-carrying car door in an opening direction by the locking member catching thereon when the locking member is in the locked position
Data Source
AI summary
In an elevator car door apparatus, a locking member is disposed on a blade-carrying car door, and is displaceable between an unlocked position and a locked position interdependently with movement of a doorstop-side blade. A guiding portion is disposed on the locking member. A guiding cam is disposed outside the blade-carrying car door. When the car is positioned outside an appropriate floor alignment position, the blade-carrying car door moves in an opening direction, the guiding portion moves along the guiding cam, the locking member displaces to the locked position, and the doorstop-side blade also displaces to a locking accommodating position, the locking member catches in a fixed latch, and movement of the blade-carrying car door in the opening direction is prevented.