Elevator Car Rail Latch Blocking for Space-Efficient Maintenance Locking
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Solution Overview
Problem
Current elevator systems require complex and expensive mechanical blocking devices for stabilizing the elevator car during maintenance, which are difficult to install and occupy valuable shaft space, making them impractical for use in modern elevator systems.
Innovation Solution
A blocking device comprising a latch, latch guide body, and position switch, designed with simple, resilient components that securely attach to the car guide rail, allowing the car and its sling to be immobilized using an L-sling system with counterweights, ensuring stable support without occupying excessive space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex mechanical blocking devices are used to stabilize the elevator car, then the car can be securely fixed during maintenance, but the device complexity and installation difficulty increase significantly
Solution Approach 1:
The blocking device is segmented into three main components: a latch (1), a latch guide body (3), and a position switch (4). The latch itself is divided into a head (11) and a body (12). This segmentation allows each component to perform its specific function independently while simplifying the overall device structure and making installation more manageable.
Solution Approach 2:
The invention extracts the essential blocking function from complex mechanical assemblies and implements it through a minimal set of components. The latch guide body (3) with its guide openings (7, 8) extracts the guiding function, while the position switch (4) extracts the detection function, leaving the latch (1) to perform purely the blocking action.
2Reliability
If traditional mechanical blocking devices are used, then the car can be immobilized, but the installation difficulty and cost increase
Solution Approach 1:
The latch guide body (3) features local quality through its specifically designed guide openings (7, 8) that accommodate the latch (1) at precise locations. The position switch (4) is positioned at a specific location to detect the latch's extended position. This localized functional design simplifies manufacturing by focusing complexity only where needed rather than throughout the entire device.
Solution Approach 2:
The latch guide body (3) with its guide openings (7, 8) automatically guides the latch (1) into the correct position during installation and operation, eliminating the need for complex alignment procedures. The position switch (4) automatically detects when the latch is in the extended blocking position, providing self-verification without additional manual intervention.
3Reliability
If space-consuming safety switches are installed, then the blocking function can be detected, but the valuable shaft space is occupied
Solution Approach 1:
The position switch (4) serves multiple functions: it detects whether the latch (1) is in the extended blocking position, and it can also serve as a safety switch to prevent elevator operation when maintenance is in progress. This multi-functionality eliminates the need for separate safety switches, preserving shaft space while maintaining detection reliability.
Solution Approach 2:
The invention merges the blocking detection function with the existing latch mechanism. The position switch (4) is integrated into the latch guide body (3) structure, and the latch's extended position directly triggers the switch. This merging combines what would traditionally be separate components into a unified space-efficient assembly.
Data Source
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AI summary
Blocking device for the car of an elevator system, comprising a latch, a latch guide body and a position switch, wherein the latch lies displaceably in the latch guide body and, in the extended position, can engage in a latch receiving opening of the car sling, preferably embodied in the horizontal beam of the car sling, when the latch is at a correspondingly aligned height with respect to the latch receiving opening of the car sling, the blocking device with its latch guide body, which preferably carries the latch and the position switch, being mountable on the car guide rail of the elevator system.