Elevator Safety Brake Actuation via Nested Linkage
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Solution Overview
Problem
Conventional elevator systems face challenges in effectively and efficiently braking a hoisted object relative to a guide member, particularly in preventing over-speed conditions, which can lead to increased complexity and component count.
Innovation Solution
A safety device with a brake block and linkage system that engages a guide member, utilizing an electromagnetic latch and biasing mechanisms to actuate a safety brake, reducing the need for components like governors and allowing for a compact, flexible design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional braking devices are used to brake the hoisted object, then braking function is provided, but system complexity and component count increase
Solution Approach 1:
The patent combines the braking function with the safety device by integrating a brake block that can engage the guide member directly. The safety device now performs both safety monitoring and braking functions through a unified mechanism, eliminating the need for separate braking components and reducing overall system complexity.
Solution Approach 2:
The safety device is designed to perform multiple functions: it monitors safety conditions and simultaneously provides braking capability through the brake block that engages the guide member. This multi-functional design replaces what would traditionally require separate safety and braking systems, reducing component count while maintaining reliability.
2Reliability
If traditional safety devices with multiple components are used, then safety function is achieved, but ease of manufacture and installation deteriorate
Solution Approach 1:
The safety device is segmented into functional modules including a mounting frame, brake block, linkage, and biasing mechanism. This modular segmentation allows each component to be manufactured independently using standard processes, improving ease of manufacture and assembly while maintaining the complete safety function.
Solution Approach 2:
The brake block is designed with movable characteristics, allowing it to transition between engaged and disengaged states relative to the guide member. This dynamic design simplifies the manufacturing process compared to fixed braking mechanisms, as it allows for easier assembly and adjustment during installation.
3Adaptability or versatility
If a compact safety device design is implemented, then flexibility in hoistway layout is improved, but device complexity may increase
Solution Approach 1:
The safety device employs a nested arrangement where the brake block is positioned within the mounting frame structure, and the linkage is integrated between these components. This nesting allows the device to occupy minimal space while maintaining all necessary functional elements, providing compactness without excessive complexity.
Solution Approach 2:
The brake block is configured to move vertically relative to the mounting frame, utilizing the vertical dimension to achieve engagement with the guide member. This dimensional approach allows for a compact horizontal footprint while maintaining the necessary braking functionality, enhancing flexibility in hoistway layout planning.
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
The safety device effectively brakes the elevator car during over-speed conditions, reducing system complexity and enhancing compatibility with various safety brakes, while allowing for a more flexible hoistway layout.
Implementation Method 1
an electromagnetic latch is housed within mounting frame. The electromagnetic latch is configured to attract a magnetic portion of the inner block assembly
Implementation Method 2
friction generated between the brake block and the guide member causes the brake block to apply a force to the linkage to actuate the safety brake
Data Source
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AI summary
A safety device configured to aid in braking movement of a hoisted object is provided including a mounting frame. A brake block is connected to the mounting frame and is operably coupled to a safety brake. An inner block assembly is disposed between the mounting frame and the brake block. The inner block assembly is movable relative to both the mounting frame and the brake block. Upon detection of a predetermined condition, the brake block is configured to engage and adjacent guide member to actuate the safety brake.