Hinged Closure Lock with Dual Cylinder and Segmented Mounting
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Solution Overview
Problem
Existing locks for hinged closure members, such as gates and doors, face issues with insufficient bolt length, weak mounting mechanisms, and limited stroke of the dead bolt, which restricts their functionality and reliability, especially under external forces and in outdoor applications.
Innovation Solution
A lock design featuring a frame with a dead bolt and latch bolt, each operable between retracted and projecting positions, utilizing two key-actuated cylinders with rotary driving bits on opposite sides of the lock, a spring-biased lever for locking, and a second turn latch bolt mechanism to enhance stroke and reliability, allowing for increased displacement and robust mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the bolts are extended to increase stroke, then the stroke is improved, but the torque on mounting mechanisms increases making them weaker
Solution Approach 1:
The mounting mechanism is divided into two separate mounting means: one for mounting the bolt to the frame, and another for mounting the bolt to the closure member. This segmentation allows each mounting point to be independently optimized for its specific loading conditions, distributing the torque loads more effectively throughout the mounting system.
Solution Approach 2:
The bolt is designed to extend through the post in a dimensional configuration that allows it to engage with mounting means on opposite sides of the closure member. This dimensional arrangement creates a more stable mounting geometry that reduces torque on individual mounting points while maintaining the required stroke length.
2Device complexity
If a single key actuated cylinder is used, then device complexity is reduced, but reliability decreases due to potential jamming
Solution Approach 1:
Each key actuated cylinder is equipped with its own independent rotary driving bit and actuation elements specifically configured for that side of the lock. This local differentiation ensures that each cylinder can independently and reliably actuate the dead bolt from its respective side, eliminating the risk of jamming that would occur with a single centralized cylinder.
Solution Approach 2:
Instead of using a single centralized actuation mechanism, the patent inverts the approach by providing separate actuation mechanisms on both sides of the lock. This inversion allows each side to operate independently, improving reliability by eliminating single-point failure modes while maintaining manageable device complexity through modular design.
3Length of moving object
If the dead bolt lever is made longer to increase stroke, then stroke is improved, but the torque on the lever increases
Solution Approach 1:
The dead bolt lever is configured to extend through the post, utilizing the dimensional space available in the post structure. This dimensional arrangement allows the lever to achieve the necessary stroke length without requiring excessive lever arm length, thereby controlling the torque requirements while maintaining adequate stroke for extended bolt applications.
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 solution provides a lock with improved stroke and reliability, capable of withstanding increased forces and maintaining functionality, even under external pressures, by using a dual-cylinder mechanism and a spring-biased locking system that prevents jamming and ensures smooth operation.
Implementation Method 1
a spring biased lever mounted on the dead bolt lever and having a locking member; a first catch provided on the frame; and a second catch provided on the frame, wherein said locking member is urged by said spring biased lever in said first catch when the dead bolt lever is in its first angular position to lock the dead bolt lever
Data Source
AI summary
A lock comprising a latch bolt and a dead bolt, a dead bolt lever to move the dead bolt, a key actuated cylinder with a rotary driving bit, a second turn latch bolt lever to move the latch bolt by using the key, a second turn latch bolt driver as an intermediary between the driving bit and the second turn lever, a spring urging the second turn driver in the path of the driving bit, and a locking mechanism to lock the dead bolt. The second turn driver comprises a follower portion which, upon actuation by the driving bit, moves the second turn driver out of the path of the driving bit thereby preventing the driving bit from being blocked. The locking mechanism comprises a slot having two catches and a spring biased lever mounted on the dead bolt lever to lock the dead bolt lever.