Elevator Threshold Angle Bracket Locking Plate Against Slippage
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Solution Overview
Problem
Existing elevator shaft door sill angle brackets experience slippage due to low friction, leading to reduced or eliminated engagement of the door leaf in the guide device, necessitating a solution for secure positioning and easy assembly.
Innovation Solution
A safety device comprising a securing plate with a perforated plate and connecting link, featuring offset toothing and alternative receptacles, allows for precise alignment and positive fit with the angle bracket, preventing slippage by providing multiple adjustment options and increased contact points for force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the angle bracket is held by friction through screw connection, then the installation is simple, but the positioning accuracy deteriorates due to slippage
Solution Approach 1:
A locking plate is introduced as an intermediary component between the angle bracket and the wall. The locking plate features a toothing structure that engages with corresponding teeth on the angle bracket, creating a positive mechanical lock that prevents slippage while maintaining the simplicity of the overall installation process.
Solution Approach 2:
The connection system is segmented into multiple functional components: the angle bracket, the locking plate with toothing, and the screw connection. This segmentation allows each component to perform its specific function - the angle bracket provides mounting, the toothing provides anti-slip positioning, and the screws provide secure attachment.
2Adaptability or versatility
If the screw connection is located in a slotted hole to compensate for tolerances, then the adaptability improves, but the reliability deteriorates due to bracket slippage
Solution Approach 1:
The locking plate with toothing acts as a mediator between the slotted hole and the screw connection. The toothing structure provides positive engagement that prevents the angle bracket from slipping within the slotted hole, while the slotted hole maintains its ability to compensate for tolerance variations in the mounting process.
3Manufacturing precision
If a locking device with toothing is introduced, then the positioning precision improves, but the device complexity increases
Solution Approach 1:
The toothing structure is implemented locally on the locking plate rather than throughout the entire assembly. This localized approach provides the necessary positioning precision at the critical interface between the locking plate and the angle bracket, while keeping the rest of the structure simple and easy to manufacture.
4Ease of operation
If multiple receptacles with different center offsets are provided, then the ease of operation improves for retrofitting, but the manufacturing precision requirements increase
Solution Approach 1:
Multiple receptacles with different center offsets are pre-positioned on the locking plate during manufacturing. This preliminary action allows installers to easily select and align the appropriate receptacle with existing screw holes during retrofitting, eliminating the need for complex measurements or modifications while maintaining adequate positioning precision.
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 solution ensures high safety and precision in positioning the angle bracket, preventing slippage and maintaining effective engagement of the door leaf, while allowing for simple and adjustable retrofitting of existing systems.
Implementation Method 1
The toothing of the perforated plate (114) and cam (112) engage to one another in a positive fit
Implementation Method 2
The angle brackets can be held and positioned on the wall by friction, i.e., in particular by friction due to a tensile force from the screw connection
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
The present invention relates to a securing device (102) for securing a position of an angle bracket (108) of a shaft-door threshold (100) of a lift shaft, to an angle bracket (108) and a securing plate (118) having such a securing device (102), and also to a method for retrofitting such a securing plate (118), wherein the securing device (102) has a slotted guide track (112), which is oriented in a direction of action (116), and a perforated plate (114), which can be arranged in the slotted guide track (112) and has a mount (208), which acts in the direction of action (116) and is intended for a screw connection (110) of the angle bracket (108), wherein the perforated plate (114) is shorter than the slotted guide track (112), as seen in the direction of action (116), and the slotted guide track (112) and also the perforated plate (114) each have at least one toothing formation (200), which is oriented in the direction of action (116), wherein the perforated plate (114) can be fixed in the slotted guide track (112) by a form fit between the toothing formations (200).