Multifunction Fire Door Handle with Toggle Lever
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Solution Overview
Problem
Existing multifunction handles for fire doors are complex to install due to the need for additional components like spindles or screws to accommodate different hands, and their mechanisms have multiple positions that complicate the switching between open and dead-bolted states.
Innovation Solution
A multifunction handle design featuring an inner follower and toggle lever with only two positions, allowing for easy installation and operation without additional parts, using springs for linkage and incorporating a flexible pin for a microswitch, enabling seamless transitions between open and dead-bolted configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional components like spindles or screws are added to accommodate different hands, then the handle can be used on both hands of the door, but the device complexity increases and installation becomes more difficult
Solution Approach 1:
The mechanism is designed with a single configurable position that can accommodate both left-handed and right-handed door configurations. The inner follower and toggle lever assembly can be positioned in one of two positions to work with either hand configuration, eliminating the need for multiple hand-specific components or additional spindles and screws.
Solution Approach 2:
The mechanism uses a movable inner follower that can be positioned in one of two locations depending on the door hand configuration. This dynamic repositioning allows the same mechanism to adapt to different hands without adding complexity, as the follower moves to the appropriate position rather than requiring separate fixed components for each hand.
2Adaptability or versatility
If multiple positions are provided in the mechanism for different hands, then the handle can function on both hands, but the ease of operation decreases due to more positions to switch between
Solution Approach 1:
The mechanism provides exactly two positions for the inner follower, corresponding to left-handed and right-handed configurations. This limited number of positions keeps operation simple while maintaining full adaptability. The user only needs to switch between two positions rather than navigating through multiple complex settings.
3Reliability
If additional parts are added for linking the locking lever to the mechanism, then the linkage is more robust, but the ease of manufacture decreases
Solution Approach 1:
The locking lever is directly integrated with the mechanism through pins that connect to the existing springs in the transmission body. This merging of components eliminates the need for separate linkage parts, maintaining robust mechanical connection while simplifying manufacturing and assembly.
Solution Approach 2:
The springs originally installed in the transmission body are used to link the locking lever to the mechanism. These multi-functional springs serve both their original purpose and the additional function of providing robust linkage for the locking lever, eliminating the need for separate linkage components.
4Strength
If the mechanism support is made rigid for structural strength, then the support is more durable, but the ease of repair decreases when microswitch installation is needed
Solution Approach 1:
The mechanism support incorporates a flexible pin that can be temporarily deformed to allow microswitch installation. The pin's flexibility enables the support structure to be opened or adjusted during installation, after which it returns to its rigid, structurally strong configuration, combining both durability and ease of repair.
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
Simplifies the installation and operation of fire door handles by eliminating the need for extra components, facilitating easy hand swapping and integrating microswitch functionality without additional parts, enhancing usability and reducing complexity.
Implementation Method 1
the mechanism support incorporates a flexible pin (2a), with fixing lugs (2b) at its free end, that makes it possible for said support to include a microswitch
Data Source
Figure 1a~1b
Figure 2
Figure 3
AI summary
Multifunction handle for doors, particularly for fire doors, which incorporates an inner follower (5) from which there emerges an opening projection (5c) capable of being located on either the right or the left of the vertical axis (1 a) of the multifunction handle (1) according to its assembly position, which depends on the opening rotation ("hand") of the door, and there being a toggle lever (4) that, in the situation where the door is dead-bolted, is located at an angle to the vertical axis (1 a) of the multifunction handle (1) on the side opposite the position of the opening projection (5c) of the inner follower (5), the toggle lever (4) being capable of being linked via its side surfaces (4b) to an opening transmitter (6) during the step of configuring the door from being dead-bolted to open or vice versa.