Multi-Point Exit Latch Without Threshold Latches
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Solution Overview
Problem
Conventional multi-point latching exit devices require expensive, time-consuming installation and maintenance due to threshold latches, which can degrade over time and are labor-intensive to install or remove, especially when concealed inside doors.
Innovation Solution
A multi-point latching device with a transom latch and side latch, actuated by a single lever through a cam arrangement, allowing concurrent operation without the need for threshold latches, and featuring adjustable rods for easy installation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multi-point latching exit devices with threshold latches are used, then security and durability against wind pressure and impact are improved, but installation and maintenance become expensive and time-consuming
Solution Approach 1:
The patent removes the threshold latch component from the exit device system. By extracting this problematic component, the invention eliminates the need for expensive and time-consuming installation and maintenance while preserving the security and durability functions through alternative latching mechanisms at the transom and jamb.
Solution Approach 2:
The exit device is divided into separate latching points (transom latch and jamb latch) that can be independently installed and maintained. This segmentation allows for easier installation and maintenance compared to the integrated threshold latch system, while maintaining multi-point security.
2Shape
If threshold latches are concealed inside doors, then aesthetic appearance is improved, but installation and removal become labor-intensive
Solution Approach 1:
The patent removes the concealed threshold latch from the door assembly. By extracting this component, the invention eliminates the labor-intensive installation and removal processes while maintaining aesthetic appearance through the use of surface-mounted transom and jamb latches that do not require door panel modification.
3Reliability
If multiple latching points are used for enhanced security, then reliability against impact and wind pressure is improved, but device complexity increases
Solution Approach 1:
The patent combines the actuation mechanism for multiple latching points into a single integrated system. The lever actuator simultaneously controls both the transom latch and jamb latch through linked mechanisms, reducing operational complexity while maintaining multi-point security against impact and wind pressure.
Solution Approach 2:
The single lever actuator performs multiple functions by simultaneously actuating both the transom latch and jamb latch. This multi-functionality reduces the number of separate components and operations needed while achieving enhanced security through multiple latching points.
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
Facilitates efficient, low-maintenance installation and operation of multi-point latches, enhancing security and durability against wind pressure and impact, with adjustable rods ensuring proper fitment without panel removal.
Implementation Method 1
a first cam configured to convert an actuation force applied to the lever to a first force in a first direction, and where a second cam is configured to convert an actuation force applied to the lever to a second force in a second direction
Data Source
AI summary
A latching device for a door includes an actuator, a first rod, a second rod, a transom latch, and a side latch having a hook latch head. The actuator may include a rod holder including a lockout configured to inhibit disengagement of a rod from the rod holder. The side latch may be a mortise latch which may include a channel configured to receive a nut for alignment during installation. When installed in an associated door, the latching device may withstand multiple impacts from windborne objects or pressures induced by high winds.