Compact Door Latch Actuator With Integrated Cam Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing door latch devices require multiple components to perform release and unlocking operations, leading to an increased device size due to the need for levers in opposing regions of the rotating body.
Innovation Solution
A door latch device design with a rotating body featuring a cam part on one end face, utilizing individual first and second cams to operate levers, allowing for compact placement and reducing the overall size by minimizing the need for components in opposing regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple levers are disposed in opposing regions of the rotating body to perform release and unlocking operations, then the operational functionality is improved, but the device size increases
Solution Approach 1:
The patent merges the control of multiple levers (first lever for release operation and second lever for unlocking operation) into a single cam part disposed on one end face of the rotating body. This consolidation eliminates the need for separate cam parts in opposing regions, thereby reducing device size while maintaining full operational functionality through the integrated cam mechanism
Solution Approach 2:
The single cam part is designed with multiple cam surfaces that can operate different levers at different rotation angles of the rotating body. This multi-functional cam part can control both the first lever for release operation and the second lever for unlocking operation, achieving versatile functionality from a compact structure
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 enables efficient operation of both latch and lock mechanisms using a single motor, reducing component count and preventing device size expansion while maintaining smooth and synchronized operations.
Implementation Method 1
a cam part disposed only on one end face of the rotating body, and a first cam to operate the first lever and a second cam to operate the second lever are individually disposed in the cam part
Implementation Method 2
the rotating body includes two tilted walls to cause the open link to move to the unlocked position via the lock lever in a case in which the rotating body rotates in one direction from a reference position
Data Source
AI summary
A door latch device includes: a rotating body; first and second levers; a lock mechanism on which an unlocking operation is performed and an open link is disposed in an unlocked position; and a latch mechanism. Further, the lock mechanism includes a lock lever which causes the open link to rotate when being operated by rotation of the rotating body, the rotating body is provided with two tilted walls so as to move the open link to the unlocked position when being rotated in one side from a reference position while the open link is disposed in a locked position, keep the open link in the unlocked position when being rotated in another side to the reference position while the open link is disposed in the unlocked position, and move the open link to the locked position when being further rotated in the another side.