Rope Bistable Commutation Device Modular Maintenance
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Solution Overview
Problem
Existing rope-operated bistable commutation devices for safety or emergency electric circuits require complex installation, involve numerous components, and are costly due to the need for proprietary switches and whole-device replacement when individual components fail.
Innovation Solution
A rope-operated bistable commutation device with a removably connected commutation unit that can be easily swapped between different switch housings, featuring a slider with helical guide surfaces and locking mechanisms for simplified assembly and maintenance, allowing for bistable operation without requiring a specially designed switch housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manually operated switch is used for bistable switching of electric contacts, then the device can control circuit operation, but the installation and operation become laborious and complex due to the need for separate switch and relay components
Solution Approach 1:
The patent combines the switch unit and bistable commutation unit into a single integrated device housed in one box-like body. The actuator is mechanically coupled to both the switch mechanism and the commutation unit, eliminating the need for separate relay components and reducing installation complexity.
Solution Approach 2:
The single actuator serves multiple functions: it directly operates the switch for circuit control and simultaneously drives the commutation unit for maintaining intermediate contact positions. This multi-functional design reduces the overall component count while maintaining full operational capability.
2Ease of manufacture
If a single box-like body containing both switch unit and bistable commutation unit is used, then integration is achieved, but all components become proprietary and must be specially designed, increasing manufacturing costs
Solution Approach 1:
The device is divided into distinct functional modules: a switch unit, a bistable commutation unit with actuator, and a housing. These modules are designed to be replaceable independently, allowing standard components to be used while maintaining integration benefits. The commutation unit can be removed and replaced without replacing the entire device.
3Ease of repair
If proprietary switches with integrated commutation units are used, then all components are specially designed for bistable operation, but replacement of individual components requires replacement of the whole device
Solution Approach 1:
The commutation unit is designed as a removable module that can be extracted from the housing independently. This allows the commutation unit to be replaced separately from the switch unit, enabling selective replacement of only the faulty component and reducing repair costs.
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 quick and cost-effective installation, reduces component count, and allows for the replacement of individual components without replacing the entire device, simplifying maintenance and production while maintaining bistable operation.
Implementation Method 1
at least one pair of helical guide surfaces in axially mutually offset relationship to define a substantially helical guide path for the at least one radial projection
Data Source
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Figure 4
AI summary
A rope-operated bistable commutation device, comprises a box-like body (2) for housing at least one switch (3) connectable to a corresponding electric circuit, a bistable commutation unit (4) operably associated to the switch (3) to promote commutation thereof between a closed circuit condition and an open circuit condition, wherein the unit (4) comprises an actuator (5) designed to be associated with an actuating rope (F) and guide means (6) for guiding the actuator (5) between a first stable operative position (A) and a second stable operative position (B) corresponding to open and closed switch (3) conditions respectively. The unit (4) is removably connected to the box-like body (2), locking means (7) being provided for holding it constantly joined with the actuator (5) set in either the first (A) or the second (B) stable operating position to allow one-piece removal thereof from the box-like body (2).