Elevator Car Door Drive Mechanism Linear Actuation
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Solution Overview
Problem
Existing elevator door operating mechanisms are complex, heavy, and require considerable maintenance due to their intricate and weighty drive components, which complicate operations and increase maintenance needs.
Innovation Solution
A linear door drive mechanism is introduced, which includes a motor, wheels, and a drive member that selectively rotates to drive the door and pivotable arms between open and closed positions, replacing the traditional reciprocating door drive mechanism, thus simplifying the system and reducing maintenance requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reciprocating door drive mechanism with crank gear is used, then the door can be driven between open and closed positions, but the system becomes complex and heavy requiring considerable maintenance
Solution Approach 1:
The patent replaces the traditional reciprocating mechanical door drive mechanism (crank gear, connecting rods, pivoting arms) with a linear motor system. The linear motor directly generates linear motion to drive the door assembly, eliminating the need for complex mechanical transmission components. This substitution of mechanical system with electromechanical system resolves the contradiction by reducing device complexity and maintenance requirements while maintaining reliable door operation between open and closed positions
2Ease of operation
If a reciprocating door drive mechanism with crank member is used, then the door linkage can be rotated 180 degrees to open and close the door, but the drive components become heavy and complex
Solution Approach 1:
The linear motor system replaces the heavy reciprocating mechanical drive components (crank member, gear, connecting elements) with a compact electromechanical actuator. The linear motor generates direct linear force to move the door assembly, eliminating the need for heavy mechanical transmission parts while maintaining smooth door operation. This substitution resolves the contradiction by significantly reducing the weight of moving objects while preserving ease of door operation
Solution Approach 2:
The patent extracts and removes the unnecessary heavy mechanical transmission components (crank gear, connecting rods, complex pivoting mechanisms) from the door drive system. By taking out these extraneous heavy parts and retaining only the essential door assembly and linear motor, the system achieves lighter weight while maintaining full operational capability for opening and closing doors
Data Source
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AI summary
According to an aspect of the present invention, a door drive mechanism for actuating a door of an elevator car laterally between open and closed positions is provided. The door is mounted on the car for lateral movement relative to the car, and is connected to the car by at least one pivotable arm. The door drive mechanism includes a linear door drive mechanism and at least door drive mount. The door drive mechanism is configured to be mounted on the car. The door drive mount is configured to be attached to the door and is in communication with the linear door drive mechanism. The linear door drive mechanism is operable to selectively drive the door drive mount, the attached door, and the pivot arm between the open position and the closed position.