Scissor Arm Door Unlocking Mechanism for Thin Doors
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Solution Overview
Problem
Existing door unlocking devices for thin inside doors are cumbersome and difficult to integrate, lacking a compact and robust alternative to traditional door handles.
Innovation Solution
A device featuring scissor arms and pivot arms mounted around fixed and parallel shafts, allowing for a slender design that can be easily inserted into a door recess, with tiltable operating elements and spring-mounted mechanisms to convert user input into a scissor movement of the bolt, enabling efficient unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional doorhandle is used for unlocking, then the unlocking function is reliable, but the device is cumbersome and difficult to integrate into thin doors
Solution Approach 1:
The coupling device is divided into distinct functional components: scissor arms for motion transformation, pivot arms for connection, and a push part for actuating the bolt. This segmentation allows each component to be optimized for its specific function while keeping the overall device compact and easy to integrate into thin doors.
Solution Approach 2:
The scissor arms are arranged in a folded configuration that transforms motion from one dimension (tilting of operating element) to another dimension (linear movement of push part). This dimensional transformation enables the device to fit within the limited thickness of the door while maintaining full functionality.
2Length of stationary object
If the device is made slender to fit into thin doors, then the ease of installation is improved, but the structural robustness may be compromised
Solution Approach 1:
The coupling device combines multiple rigid components (scissor arms, pivot arms, shafts) connected through precise pivot points and guides. This composite structure distributes mechanical loads across multiple elements, maintaining structural robustness despite the overall slender form factor required for thin door integration.
Solution Approach 2:
The scissor arms and pivot arms are designed with curved geometries that optimize stress distribution and mechanical advantage. The curved paths of the pivot points and guides ensure smooth motion transformation while maintaining strength throughout the slender structure.
3Ease of operation
If the scissor arms are extended to provide sufficient travel for bolt movement, then the unlocking function is effective, but the device length increases making it difficult to fit into thin doors
Solution Approach 1:
The scissor arms transform the tilting motion of the operating element into linear motion of the push part through a mechanical advantage arrangement. This motion transformation allows sufficient travel distance for effective bolt actuation while keeping the physical footprint of the device compact and suitable for thin door integration.
Solution Approach 2:
The scissor arm mechanism serves multiple functions simultaneously: it amplifies the operating element's motion, transforms the direction of force application, and provides the necessary travel distance for bolt movement. This multi-functionality eliminates the need for separate mechanisms, keeping the overall device length minimal.
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 device provides a compact, robust, and easy-to-install solution for unlocking thin doors, allowing for efficient operation and integration into door recesses, enhancing user experience and door functionality.
Implementation Method 1
The first and second tilting shafts are spring-mounted relative to each other, this such that these tilting shafts are movable toward each other during placing of the device in the door and can move with spring action away from each other for the purpose of positioning the device in the door
Implementation Method 2
the coupling comprises a pair of scissor arms mounted rotatably around a fixed shaft and a pair of pivot arms. Each pivot arm is connected at a first end for pivoting around a respective first shaft to a corresponding scissor arm and connected at a second end for pivoting around a second shaft to a push part intended to engage against the bolt
Data Source
AI summary
Device for unlocking a door, comprising at least one operating element; a bolt; a coupling which can be placed in the door and which is coupled between the bolt and the operating element, wherein the coupling comprises a pair of scissor arms mounted rotatably around a fixed shaft, and a pair of pivot arms, wherein each pivot arm is connected at a first end for pivoting around a first shaft to a scissor arm and connected at a second end for pivoting around a second shaft to a push part intended to engage against the bolt, such that a tilting of the operating element brings about a movement of the push part, and thus of the bolt.