Door Latch Mechanism with Oblique Cam for Independent Handle Operation
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Solution Overview
Problem
Existing door handle assemblies lack independent operation of opposing 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 rack components, a cam member with an oblique cam surface, and an intermediate component that allows independent movement of the handles to displace the cam member and operate the latch, enabling independent operation of opposing handles and a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional door latch mechanism is used, then the structure is simple, but the opposing handles cannot operate independently
Solution Approach 1:
The latch mechanism is divided into separate rack components for each handle, allowing independent movement and operation. Each rack component can move independently along its channel, enabling the handles to operate independently without interfering with each other.
Solution Approach 2:
The mechanism transitions from a single-dimensional linear motion to a two-dimensional planar motion by introducing perpendicular channels. The first channel runs horizontally while the second channel runs vertically, allowing rack components to move in different directions and dimensions, thereby enabling independent handle operation.
2Adaptability or versatility
If the handle motion to latch displacement is fixed, then the mechanism is simple, but the latch displacement is not adjustable
Solution Approach 1:
The cam surface is designed with variable geometry that allows dynamic adjustment of the latch displacement based on the handle motion. The oblique cam surface creates a variable mechanical advantage, enabling the latch to be displaced different distances depending on how far the handle is moved, thus providing adjustable latch displacement.
Solution Approach 2:
The mechanism changes the geometric parameters of the cam surface to control the relationship between handle motion and latch displacement. By adjusting the angle and curvature of the cam surface, the latch displacement can be varied while maintaining a relatively simple overall structure.
3Volume of moving object
If the door handle assembly is made compact, then the space is reduced, but the mechanism becomes more difficult to design
Solution Approach 1:
The rack components are positioned within the channels of the base, and the cam member is disposed within the second channel, creating a nested arrangement. The intermediate component is disposed between the rack components and cam member, allowing multiple components to occupy overlapping or adjacent spaces, thereby reducing the overall volume of the mechanism.
Solution Approach 2:
By utilizing perpendicular channels in different dimensions, the mechanism can pack components more efficiently. The first channel and second channel being substantially perpendicular allows components to be arranged in a compact footprint while maintaining sufficient space for movement, reducing the overall volume without sacrificing functionality.
4Adaptability or versatility
If the rack components move independently, then the handles can operate independently, but the mechanism requires more space
Solution Approach 1:
The mechanism utilizes two-dimensional space with perpendicular channels to allow independent movement of rack components. The first channel extends in one direction while the second channel extends perpendicular to it, enabling independent handle operation within a compact area by efficiently utilizing spatial dimensions.
Solution Approach 2:
The base integrates both channels and the cam member housing into a single unified structure, combining multiple functional elements into one component. This merging reduces the overall area required while maintaining the independence of the rack components, as they share common support and mounting structures.
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 handles, adjustable latch displacement, and a compact configuration, enhancing the functionality and versatility of door handle assemblies by allowing for secure door operation in both push-pull directions.
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.