Motor-Driven Latch Ejector for Universal Strike Compatibility
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Solution Overview
Problem
Existing electric strike assemblies require multiple configurations to accommodate various lockset types and necessitate cutting the door frame for proper installation, which is inefficient and aesthetically unpleasing.
Innovation Solution
A modular electric strike assembly with a latch release mechanism, including a motor-driven latch ejector and a cam portion, that can be configured for left- or right-handed operation without frame cutting, compatible with both mortise and cylindrical locksets, using a planetary gear motor and Hall Effect sensor for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional electric strike assemblies are used to accommodate various lockset types, then compatibility with different locksets is achieved, but multiple configurations and frame cutting are required which increases installation complexity
Solution Approach 1:
The latch ejector is designed with a universal geometry that can engage with different lockset types (cylindrical and mortise) through a single standardized interface. The ejector's curved surface and positioning features accommodate variations in deadlatch positions and orientations without requiring different ejector designs, thereby achieving multi-functionality and eliminating the need for multiple configurations.
Solution Approach 2:
The strike assembly is divided into modular components including the strike body, latch ejector, and mounting bracket as separate interchangeable parts. This segmentation allows the ejector to be independently positioned and oriented within the strike body to match different lockset configurations, simplifying installation by allowing modular adjustment rather than requiring custom-built strikes for each lockset type.
2Reliability
If traditional electric strike assemblies are used, then proper engagement with the door latch is achieved, but the door frame must be cut to provide clearance for the rotating keeper
Solution Approach 1:
Instead of having the keeper rotate within the strike assembly as in traditional designs, this invention inverts the mechanism by using a stationary strike body with a movable latch ejector that actively pushes the latch outward. This inversion eliminates the need for rotational clearance in the door frame while maintaining reliable latch engagement, as the ejector's linear reciprocating motion provides the necessary engagement without requiring frame modifications.
Solution Approach 2:
The rotational movement function is extracted from the strike assembly and transferred to the latch ejector mechanism. The ejector incorporates the motion required for latch engagement within its own structure through reciprocating linear movement, thereby removing the need for the door frame to provide rotational clearance space that would be required by a rotating keeper mechanism.
3Adaptability or versatility
If a modular latch release assembly is used, then versatility across lockset types is improved, but the device complexity increases
Solution Approach 1:
The latch ejector incorporates localized geometric features such as curved engagement surfaces, positioning ribs, and oriented facets that are specifically designed to match corresponding features on different lockset types. These localized quality variations in the ejector's geometry enable it to adapt to different lockset configurations without requiring overall redesign of the entire assembly, thereby achieving versatility with minimal added complexity.
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
Enables simplified installation and operation across multiple lockset types without frame modification, enhancing versatility and aesthetic appeal while maintaining secure door control.
Implementation Method 1
The motor housing may then include a printed circuit board in communication with a Hall Effect sensor whereby the Hall Effect sensor monitors a rotational position of the latch ejector.
Data Source
AI summary
A door strike assembly includes a strike housing and latch release assembly. The door strike assembly is used in conjunction with a lockset which includes a door latch moveable from a latched condition when a door is closed and an unlatched condition where the door may be opened. The lockset includes a deadlatch to prevent unauthorized movement of the door latch when the door is closed. The latch release assembly is received within the strike housing and includes a latch ejector which engages the deadlatch when the door is closed. A motor is coupled to the latch ejector where actuation of the motor rotates the latch ejector to disengage the latch ejector from the deadlatch. Further rotation of the latch ejector causes the latch ejector to engage the door latch to move the door latch to the unlatched condition such that the door may be opened.