Escape Door Locking Bar with Dual-Slope Strike Plate
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Solution Overview
Problem
The existing locking arrangements for double-leaf escape doors require excessive force to open, especially when a preload is applied, making emergency opening difficult due to the design of the locking bars and their interaction with the strike plates.
Innovation Solution
A locking arrangement featuring upper and lower locking bars with inclined sections that transition from a first slope to a second slope, allowing the locking bars to move from an extended to a retracted position with reduced force, facilitated by an actuating device such as a nut or motor, which reduces the effort required for opening the door.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locking bars are extended to engage with strike plates for secure locking, then locking reliability is improved, but force required to open the door increases
Solution Approach 1:
The strike plate is divided into two distinct sections: a first section with a first slope and a second section with a second slope. This segmentation allows the locking bar to experience different mechanical conditions during engagement and disengagement, enabling reliable locking while reducing the force needed to open the door.
Solution Approach 2:
The locking mechanism transitions from a static engagement to a dynamic process where the locking bar moves through different slope sections. The change in slope angle during the opening process creates a dynamic relief effect that reduces the force requirement, transforming the opening action from overcoming constant friction to a progressive mechanical advantage system.
2Strength
If locking bars are pressed against strike plates under preload, then locking strength is improved, but ease of operation deteriorates
Solution Approach 1:
Different sections of the strike plate are given different local qualities through varying slope angles. The first section provides a shallower slope for secure engagement under preload, while the second section provides a steeper slope that facilitates easier disengagement during emergency opening, creating localized functional zones with optimized properties.
Solution Approach 2:
The preload force that initially appears to hinder emergency opening by pressing the locking bar against the strike plate is converted into a beneficial force. As the locking bar transitions from the first to the second section, the preload contributes to the mechanical advantage created by the slope change, actually facilitating the opening process rather than resisting it.
3Device complexity
If a single slope design is used for strike plates, then device complexity is reduced, but productivity of opening process deteriorates
Solution Approach 1:
The strike plate is segmented into two functional sections with different slope characteristics, transforming a simple single-slope design into a compound structure that provides both secure locking and efficient opening. This segmentation adds minimal geometric complexity while dramatically improving the opening process by creating a mechanical advantage during the transition between sections.
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 design significantly reduces the force needed to open the door, enabling reliable emergency opening even with a preload, by providing relief as the locking bar transitions from the first to the second section, thus supporting the unlocking process.
Implementation Method 1
the first gradient and the second gradient are designed differently from one another... on which a contact pressure of the locking rod acts when the locking arrangement is unlocked
Data Source
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AI summary
The invention relates to a locking arrangement (500) with at least one locking bar (520) and with at least one locking element (300) for the locking bar (520), wherein the locking bar (520) is engaged with the locking element (300) in an extended position and is disengaged from the locking element (300) in a retracted position, wherein the locking element (300) comprises at least one first side wall (310), wherein the first side wall (310) is subdivided into at least one first section (311) and one second section (312), wherein the first section (311) has a first slope (313) and the second section (312) has a second slope (314), wherein the first slope (313) and the second slope (314) are configured differently from each other.According to the invention, the locking arrangement (500) comprises an actuating device (140), wherein the locking bar (520) can be moved from the extended position to the retracted position by means of the actuating device (140), wherein one end of the locking bar (520) passes through both the first section (311) and the second section (312) during actuation of the actuating device (140) to move the locking bar (520) from the extended position to the retracted position.