Door Latch Mechanism with Segmented Racks and Oblique Cam
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Solution Overview
Problem
Existing door handle assemblies with push-pull operation lack independent operation of opposing door handles, adjustable translation of handle motion to latch displacement, and a compact configuration, limiting their functionality and versatility.
Innovation Solution
A door latch mechanism with a base having perpendicular channels and independently movable rack components, a cam member with an oblique cam surface, and an intermediate component that translates handle motion into latch displacement, allowing independent operation of opposing handles and a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single rack component is used to operate the latch, then the structure is simpler, but the opposing door handles cannot operate independently
Solution Approach 1:
The single rack component is divided into two separate rack components, each independently operable by one of the opposing door handles. This segmentation allows each handle to independently control the latch mechanism without interfering with the other handle's operation, resolving the contradiction between independent operation and structural simplicity.
2Adaptability or versatility
If the latch displacement is fixed, then the mechanism is simpler, but the translation of handle motion to latch displacement is not adjustable
Solution Approach 1:
The cam member is designed with an adjustable cam surface that can be repositioned along the rack component's path of motion. This allows the translation ratio between handle motion and latch displacement to be dynamically adjusted by changing the cam surface position, providing adaptability while maintaining a relatively simple mechanical structure.
3Volume of moving object
If the door latch mechanism is designed to be compact, then the space occupied is reduced, but the independent operation and adjustable translation features may be compromised
Solution Approach 1:
The two rack components are arranged in a compact configuration where they share common support structures and guide channels. The cam member is positioned to efficiently convert the linear motion of either rack component into the required latch displacement. This dimensional arrangement allows compact packaging while preserving independent operation capability through proper spacing and guidance of the two rack components.
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 independent operation of opposing door handles, adjustable latch displacement, and a compact configuration, enhancing the functionality and versatility of door handle assemblies by facilitating secure door operation with push-pull mechanisms.
Implementation Method 1
a cam member adapted to be coupled to a latch for a door handle assembly. The cam member is disposed in the second channel and is movable along the second channel. The cam member includes a protrusion extending away from the second channel, the protrusion defining a cam surface oblique relative to each of the first and second channels
Data Source
AI summary
The door latch mechanism independently operated by first and second handles of the door handle assembly comprising a cam member having a cam surface which facilitates translation of movement of the handles to displacement of the cam member. The cam member can be coupled to a latch member and move the latch member between an extended and retracted position. A door lock mechanism can prevent displacement of the second door handle while simultaneously allowing displacement of the first door handle.