Compact Electrified Latch Retraction for Standard Mortise Pockets
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Solution Overview
Problem
Existing mortise locksets with motorized electric latch retraction assemblies require large motors that protrude from the mortise housing, necessitating modifications to the door, which is not compatible with standard mortise pockets.
Innovation Solution
A mortise lockset with a compact electrified latch retraction assembly using two motors to independently control the locked/unlocked and latched/unlatched states, allowing integration into standard mortise pockets without modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a motorized electric latch retraction assembly is installed in a mortise lockset, then the latchbolt can be selectively retracted against internal biasing forces, but the motor required is relatively large and projects from the mortise housing, requiring modifications to the door
Solution Approach 1:
The patent applies nesting by placing the motorized retraction assembly inside the existing mortise pocket of the door. The motor unit is contained within the mortise housing rather than projecting outward, allowing the system to fit within the standard door preparation without requiring additional modifications. This nested configuration enables the electrified retraction capability while maintaining compatibility with standard door mortises.
2Reliability
If a motorized electric latch retraction assembly is installed in a mortise lockset, then the latchbolt can be selectively retracted against internal biasing forces, but the motor projects from the mortise housing, necessitating modifications to the door
Solution Approach 1:
The patent achieves universality by designing a motorized retraction assembly that fits within the standard mortise pocket configuration used by conventional locksets. The compact motor unit is integrated into the mortise housing in a way that maintains compatibility with existing door preparations. This universal design allows the electrified retraction system to be installed in standard doors without requiring custom modifications, making the technology broadly applicable across different door types and configurations.
3Volume of moving object
If a compact motor is used in the latch retraction assembly, then the system can be integrated into standard mortise pockets, but the motor must operate efficiently within limited space
Solution Approach 1:
The patent applies parameter changes by optimizing the motor's operational characteristics to match the constrained environment of the mortise pocket. The motor is selected or designed with specific parameters including higher torque density, appropriate rotational speed, and efficient power consumption characteristics. These parameter adjustments enable the compact motor to generate sufficient power to retract the latchbolt against internal biasing forces while maintaining a small size that fits within the limited space of the standard mortise housing.
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 the integration of a motorized latch retraction system within standard mortise pockets, maintaining functionality and aesthetics while reducing the need for door modifications.
Implementation Method 1
The drive assembly includes a first motor configured to operate in response to a lock/unlock signal to thereby adjust the locked/unlocked state
Implementation Method 2
The latch retraction assembly includes a second motor configured to operate in response to a latch/unlatch signal to thereby adjust the latched/unlatched state
Data Source
AI summary
An exemplary access control device has a locked/unlocked state and a latched/unlatched state, and generally includes a housing, a latchbolt, a handle, a drive assembly, and a latch retraction assembly. The latchbolt is mounted in the housing for movement between an extended position, in which the latched/unlatched state is a latched state, and a retracted position, in which the latched/unlatched state is an unlatched state. The handle is operable to retract the latchbolt when the locked/unlocked state is an unlocked state, and the handle is inoperable to retract the latchbolt when the locked/unlocked state is a locked state. The drive assembly includes a first motor configured to operate in response to a lock/unlock signal to thereby adjust the locked/unlocked state. The latch retraction assembly includes a second motor configured to operate in response to a latch/unlatch signal to thereby adjust the latched/unlatched state.