Sabbath Elevator Counterweight Operation With Minimal Motor Power
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Solution Overview
Problem
Existing Sabbath elevators face concerns among Orthodox Jewish groups due to increased electricity usage, activation of electronic components, and mechanical issues, making them unacceptable for strict religious observance.
Innovation Solution
The Sabbath elevator employs mechanisms to minimize electricity usage by leveraging gravitational pull, using a counterweight to ascend and descend, and includes a car occupancy limiter to ensure the car and passengers' weight does not exceed the counterweight's weight, along with contactless sensors and optical indicators to avoid electronic activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the elevator motor is used to move the elevator car with passengers, then the elevator can transport passengers, but the electricity usage increases which is unacceptable for Sabbath observance
Solution Approach 1:
The patent employs a counterweight system where the counterweight is configured to be heavier than the empty elevator car. When the car ascends, the heavier counterweight pulls the car upward through the cable system, utilizing gravitational force rather than motor power. When the car descends with passengers, the combined weight of car and passengers may exceed the counterweight, allowing the loaded car to pull the counterweight upward while descending, again using gravity rather than motor energy. This counterweight mechanism eliminates or minimizes motor electricity consumption during Sabbath operation.
2Reliability
If electronic components such as weight sensors, tachometers, and door buzzers are activated, then the elevator can monitor and control operation, but these electronic activations are prohibited during Sabbath
Solution Approach 1:
The patent removes or disables electronic components during Sabbath mode operation. Weight sensors, tachometer encoders, and door buzzer systems are either taken out of service or their activation is prevented during Sabbath operation. The system allows the elevator to function mechanically without these electronic monitoring and control features, accepting reduced reliability in exchange for Sabbath compliance.
3Object-affected harmful factors
If the door obstruction detection mechanism is activated to ensure safety, then passenger safety is improved, but the mechanism reactivation and buzzer activation are problematic for Sabbath observance
Solution Approach 1:
The patent disables the door obstruction detection mechanism during Sabbath mode to prevent electronic activation and buzzer sounds. While this reduces safety monitoring, it allows the elevator to operate without electronic interventions that would violate Sabbath observance. The mechanical door operation continues without electronic sensing or warning systems.
4Ease of operation
If the elevator stops at every floor to allow passenger entry and exit, then accessibility is improved, but the frequent stops increase energy consumption and operational complexity
Solution Approach 1:
The patent uses the counterweight system to enable frequent stops without increasing motor energy consumption. Since the counterweight handles the gravitational load during ascent and descent, the motor only needs to provide minimal energy for braking and positioning at each floor, rather than continuously powering the car through multiple stops. This allows Sabbath mode operation with stops at every floor while maintaining low electricity usage.
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
This approach reduces energy consumption and complies with religious requirements by preventing unnecessary electrical activation, ensuring the elevator operates within acceptable religious guidelines.
Implementation Method 1
the system ensures that the direction of travel of the elevator car is enabled by the gravitational pull on either the counterweight (for ascending car) or the car (for descending car)
Implementation Method 2
when the car is ascending, the counterweight will be heavier such that it pulls the car upwards as the counterweight is pulled down by gravity and no motor rotational energy is used
Data Source
AI summary
A method of operating an elevator, the elevator having an elevator car, a motor, a controller and a counterweight (CW), the method including, for ascending of the elevator car when loaded with passengers, providing a car occupancy limiter (COL) and activating the COL by the controller for ensuring that the loaded car weighs less than the CW and controlling by the controller of the motor to not use motor rotational power; and for descending of the elevator car when loaded with passengers, where the loaded car weighs more than the CW, controlling by the controller of the motor to not use motor rotational power.