Elevator Landing Door Lock Unit Retrofit Safety Kit
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Solution Overview
Problem
Conventional elevator landing door unlocking devices can be inadvertently unlocked even when the elevator car is not correctly positioned, compromising operational safety and requiring complex manufacturing and assembly processes.
Innovation Solution
A retrofit safety kit with a lock unit that attaches to the existing unlocking device, allowing unlocking only when the elevator car is correctly positioned, featuring a lock that prevents actuation in a secured position and automatically actuates the unlocking element when moved to a release position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional unlocking device with a manual actuator is used, then the door can be unlocked manually, but unlocking is also possible when the elevator car is not in the correct position on the platform
Solution Approach 1:
A lock unit is introduced as an intermediary component between the key element and the unlocking element. The lock unit includes a lock that can be adjusted between a blocking position (preventing unlocking) and a releasing position (allowing unlocking). This intermediary mechanism ensures that manual unlocking is only possible when the key element is correctly positioned, thereby maintaining both ease of operation and safety against unauthorized unlocking.
2Reliability
If an unlocking device with a key element is used to prevent unauthorized unlocking, then safety is improved, but manufacturing and assembly become more difficult and less flexible
Solution Approach 1:
The unlocking device is segmented into separate functional components: a key element (that can be detached and carried), a lock unit (with the lock mechanism), and an existing unlocking device. This segmentation allows the safety function to be added as a modular retrofit rather than requiring complete redesign of the original unlocking mechanism, thereby reducing manufacturing and assembly complexity while maintaining safety.
Solution Approach 2:
The lock unit is pre-configured with the lock mechanism and blocking element before installation. During installation, the lock unit is simply attached to the existing unlocking device, and the key element is provided to the operator. This preliminary preparation of components simplifies the overall assembly process and reduces on-site complexity.
3Adaptability or versatility
If the lock unit is attached to the existing unlocking device, then flexibility and ease of installation are improved, but the structural complexity of the unlocking device increases
Solution Approach 1:
The lock unit is designed with universal attachment capabilities that can interface with various types of existing unlocking devices. The lock unit serves multiple functions: it blocks the unlocking element when in the blocking position, releases the unlocking element when in the releasing position, and provides a mounting structure for the key element. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in overall device complexity while maintaining high adaptability.
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to a security kit (10) for securing an elevator floor door (100) that can be unlocked by means of a manually operated release element (110), wherein a lock unit (20) that can be attached in the vicinity of the release element (110) is provided, comprising a lock (22) and a locking mechanism (24) for preventing the release element (110) from being actuated in a secure position of the lock (22) and for releasing and/or causing the release element (110) to be actuated by moving the lock (22) from the secure position to a release position, and a key element (50) that is compatible with the lock for moving the lock (22) are provided.