Double Latch Lockset Drive Assembly for Panic Exit
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Solution Overview
Problem
Existing double latch locksets face challenges in convenience, efficiency, and safety, particularly in panic situations where occupants struggle to simultaneously unlock both latches quickly and securely.
Innovation Solution
A double latch lockset with a drive assembly that connects a first retractable latch and a second retractable latch, allowing simultaneous retraction of both latches with a single action, while enabling independent activation of the second latch and incorporating a one-way latch cam for adaptable handedness, along with a locking rack and pinion for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If both latches are manually unlocked separately, then security is maintained, but operation complexity increases and panic exit efficiency decreases
Solution Approach 1:
The patent combines two separate latch mechanisms (retractable latch and deadbolt) into a single integrated lockset unit. The drive assembly merges the actuation mechanisms so that one actuator controls both latches, eliminating the need for separate manual operations while maintaining security functionality.
Solution Approach 2:
The single actuator serves multiple functions: it can retract both latches simultaneously for panic exit, lock the deadbolt for security, and independently control each latch. This multi-functionality resolves the contradiction by providing simplified operation without compromising the complex security requirements.
2Productivity
If a single actuator controls both latches, then panic exit efficiency improves, but control precision over individual latches decreases
Solution Approach 1:
The drive assembly is segmented into separate control paths within the integrated mechanism. The first actuator can engage different portions of the drive mechanism to achieve different outcomes: simultaneous retraction of both latches for panic exit, or selective actuation of the deadbolt for security locking, maintaining precise control despite single actuator input.
Solution Approach 2:
The mechanism employs dynamic control where the same actuator position can produce different latch states based on the current configuration. The spring-loaded deadbolt and cam mechanism allow the system to dynamically respond to actuator input, providing both rapid simultaneous retraction and precise individual control as needed.
3Reliability
If the deadbolt can be locked independently, then security is enhanced, but mechanism complexity increases
Solution Approach 1:
The drive assembly acts as an intermediary mechanism that manages the complexity of independent deadbolt control. It includes separate components such as a deadbolt spring, cam mechanism, and trigger system that mediate between the single actuator and the deadbolt, enabling independent security locking without requiring a completely separate control system.
4Reliability
If the first latch remains projected during deadbolt locking, then safety is improved, but mechanical stress on the system increases
Solution Approach 1:
The mechanism incorporates spring elements and cam profiles that are pre-configured to cushion the mechanical stress during the locking sequence. The spring-loaded deadbolt and cam mechanism absorb and distribute forces, protecting the system from excessive stress while maintaining the safety requirement that the first latch remains projected during deadbolt engagement.
Data Source
AI summary
A double latch lockset, or its kit form, generally includes first and second retractable latches connected by a drive assembly. The first retractable latch may be activated by a first inside and/or outside actuator, and the second retractable latch may be activated by a second inside and/or outside actuator that activates the second retractable latch (such as a deadbolt) independently of the first retractable latch. Movement of the first inside and/or outside actuator in a first direction simultaneously retracts the first and second retractable latches, and movement of the first inside and/or outside actuator in a second direction locks the second retractable latch. The first inside and outside actuators may be configured to move in the second direction without retracting the first retractable latch.