Elevator Door Engagement Device Parallel Link Mechanism
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Solution Overview
Problem
Elevator door engagement systems with swing arm type door opening and closing devices face challenges in replacing or upgrading to systems without swing arms, limiting user-driven renewal and flexibility in elevator maintenance and customization.
Innovation Solution
An elevator door engagement device featuring a parallel link mechanism with first and second members, rollers, and a cam mechanism that allows for the locking and unlocking of car and landing doors, enabling operation without a swing arm, by adjusting the position of rollers to clamp and release the engaged part, facilitating synchronization of door movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a swing arm type door opening and closing device is used, then the door engagement mechanism can be simplified, but the system lacks flexibility for renewal and customization
Solution Approach 1:
The door engagement device is divided into independent functional modules: a parallel link mechanism for positioning, a cam mechanism for actuation, and roller elements for engagement. This segmentation allows each module to be independently selected, replaced, or adjusted, providing renewal flexibility while maintaining operational simplicity
Solution Approach 2:
The parallel link mechanism serves multiple functions: it positions the rollers, transmits motion from the cam mechanism, and maintains engagement force throughout the door operation cycle. This multi-functionality reduces the overall number of components needed while preserving system adaptability
2Adaptability or versatility
If a door opening and closing device without swing arm is installed, then user customization and renewal flexibility are improved, but the locking and unlocking function becomes difficult to achieve
Solution Approach 1:
The cam mechanism acts as an intermediary that converts the linear or rotational motion from the door opening and closing device into the specific motion required for roller actuation. This intermediary function ensures reliable locking and unlocking without requiring a swing arm, as the cam profile can be designed to match the specific motion requirements of the roller engagement system
Solution Approach 2:
The parallel link mechanism provides dynamic positioning of the rollers, adjusting their position and orientation in real-time to maintain optimal engagement with the engaged part throughout the door's motion. This dynamic adjustment ensures reliable locking and unlocking functions even without the mechanical advantage of a swing arm
3Stability of the object's composition
If rollers are positioned to clamp the engaged part, then door synchronization is improved, but the mechanism complexity increases
Solution Approach 1:
The parallel link mechanism and roller positioning system are merged into a single integrated structure. The links not only transmit motion but also directly position and support the rollers, eliminating the need for separate positioning mechanisms and reducing overall structural complexity while maintaining door synchronization
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
Enables the locking and unlocking of landing door mechanisms corresponding to swing arm type door opening and closing devices, even when a swing arm is not present, allowing for flexible elevator renewal and improved user customization options.
Implementation Method 1
a cam mechanism configured to hold the first member at the first position in a door closed state, allow the first member to pivot from the first position to the second position, and hold the first member at the second position when the car door has moved from the door closed state in a door opening direction
Data Source
AI summary
Provided is an elevator door engagement device including a first member and a second member extending in a vertical direction; at least one of a first link member and a second link member, the first link member constituting together with the first member a parallel link mechanism, the second link member constituting together with the second member a parallel link mechanism; a first roller arranged in the first member; and a second roller arranged in the second member.