Lockable Lockset with Dual-Mode Cam Actuation
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Solution Overview
Problem
Existing locksets that combine axial and rotational modes of operation for a latch bolt are complex and lack a practical, durable, and cost-effective solution for standard doors, particularly in terms of selective lockability from one or both sides.
Innovation Solution
A lockset design featuring a cam mechanism and locking plates that allow the latch bolt to be retracted via axial or rotational movement of the knobs, with a locking mechanism to prevent movement when locked, utilizing a combination of cylindrical and tubular lockset components for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lockset is designed to be operable in both push-pull and rotational modes with selective locking capability, then the functionality and versatility are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines push-pull and rotational operational modes into a single integrated lockset mechanism. The actuator unit with cam mechanism merges two previously separate locking methods into one unified system, allowing both axial and rotational movements to control the same latch bolt through a single set of knobs.
Solution Approach 2:
The lockset is designed with multi-functionality to operate in multiple modes (push-pull and rotational) and provide both locking and non-locking functions. The same actuator unit and cam mechanism serve multiple purposes: enabling axial movement for latch retraction, rotational movement for latch retraction, and selective locking when engaged, eliminating the need for separate mechanisms for each function.
2Adaptability or versatility
If a lockset incorporates selective locking capability from one or both sides, then the security and functionality are improved, but the ease of installation in standard doors deteriorates
Solution Approach 1:
The locking mechanism is designed to be dynamically adjustable, allowing the locking bar to be selectively engaged or disengaged from the locking plates. This dynamic capability enables the lockset to be configured for single-sided or double-sided locking as needed, providing versatility without requiring different hardware for different installation scenarios.
3Reliability
If a lockset uses locking plates that engage the tubular structure to prevent axial and rotational movement, then the reliability and durability are improved, but the device complexity increases
Solution Approach 1:
The locking plates serve as intermediary elements between the actuator unit and the mounting unit. When the locking bar engages these plates, they mediate the transmission of locking force to the tubular structure, preventing both axial and rotational movement. This intermediary mechanism provides reliable multi-directional locking without requiring a complex direct engagement system.
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
The design provides a reliable, easy-to-install, and cost-effective lockset that is operable in both push-pull and rotational modes, ensuring secure operation from either side while maintaining simplicity and durability.
Implementation Method 1
a first cam configured to engage the latch retractor mechanism during rotational movement of the actuator unit so as to move the latch bolt from the extended position to the retracted position; the actuator unit having a second cam configured to engage the latch retractor mechanism during axial movement of the actuator unit so as to move the latch bolt from the extended position to the retracted position
Implementation Method 2
a locking mechanism configured to selectively extend between the actuator unit and the mounting unit so that when the locking mechanism is extended, the actuator unit is prevented from moving both rotationally and axially relative to the mounting unit
Data Source
AI summary
A lockset has an actuator unit, a mounting unit and a latch retractor mechanism. The mounting unit attaches the lockset to a door and supports the actuator unit and latch retractor mechanism. The actuator unit includes inside and outside door knobs and a cam mechanism that move together within the mounting unit. During rotational movement, a first cam of the cam mechanism engages the latch retractor mechanism to retract the latch. The actuator is axially movable along an axis of the actuator unit when one of the knobs is pushed or pulled. During axial movement, a second cam of the cam mechanism engages the latch retractor mechanism to retract the latch. A locking mechanism is selectively actuable to act between the actuator unit and the mounting unit to prevent both rotational and axial movement of the actuator unit relative to the mounting unit, thereby locking the lockset.