Elevator Door Locking Mechanism Reducing Projection
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Solution Overview
Problem
Conventional elevator door devices have a large projection amount towards the landing side due to the placement of all locking mechanism components on the front side of the rail, which is a limitation in designs requiring a smaller projection for narrow elevator car and landing floor distances.
Innovation Solution
The locking mechanism components are reconfigured such that at least part of the engaged part is located between the rail and the upper end of the entrance, overlapping with the rail, allowing the opening and closing parts to operate without abutting on the engaged part, thereby reducing the projection amount from the car to the landing floor or vice versa.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all locking mechanism components are disposed on the front side of the rail, then the locking mechanism can reliably lock the door, but the projection amount from the car toward the landing floor becomes large
Solution Approach 1:
The patent applies dimensionality change by moving the engaged part from the front side (horizontal dimension) to the space between the rail and upper end of the entrance (vertical dimension). This allows the locking mechanism to maintain its locking function while reducing the horizontal projection amount from the car toward the landing floor, effectively utilizing the vertical space that was previously underutilized.
Solution Approach 2:
The engaged part is nested within the space defined by the rail and the upper end of the entrance, utilizing the existing structural envelope. By placing the engaged part in this nested space and having it overlap with the rail in plan view, the design achieves compact integration without increasing the overall projection dimensions.
2Length of stationary object
If the engaged part is disposed in the area between the rail and upper end of the entrance, then the projection amount is reduced, but the opening and closing part must be designed to avoid abutting on the engaged part
Solution Approach 1:
The opening and closing part is designed with local quality variations - specifically, the lower end portion has a modified shape that allows it to pass by the engaged part without abutting. This localized shape modification enables the door to clear the engaged part during operation while maintaining the compact projection dimensions, without requiring complex changes to the entire door structure.
Data Source
AI summary
Provided is an elevator door device including: a rail that is disposed above an entrance; an opening and closing part of the entrance; and a locking mechanism that locks the opening and closing part. The locking mechanism includes: an engaging part including an engaging body that changes its position between a releasing position and an engaging position in association with the opening and closing of the opening and closing part; and an engaged part including an engaged body engaged with the engaging body at the engaging position. The engaged part is disposed in an area between the rail and the entrance, and overlaps with the rail as seen in plan view in the area. The opening and closing part has such a shape as to be able to open and close without abutting on the engaged part.