Vehicle Door Locking Device Single Screw Fastening
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Solution Overview
Problem
Existing locking devices for vehicle doors and hatches require a large number of components, leading to increased installation space and production/assembly costs, while sacrificing some security against forced opening.
Innovation Solution
A locking device design that uses a single screw for both fastening and securing the cylinder lock, featuring a bracket element that radially encompasses the cylinder bushing with a threaded bore and a conical pressure surface, allowing axial and radial force transmission, and an additional opening for secure hooking, ensuring both functions are fulfilled with reduced component count and space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple screws and components are used for fastening and securing the cylinder lock, then security against forced opening is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent combines the fastening function and securing function into a single screw component. The screw has a head that engages with the cylinder bushing for fastening, and its shank extends through the bearing bracket to provide securing against forced opening. This merging of functions reduces the number of components from multiple screws and separate fastening/securing elements to just one integrated screw, thereby reducing device complexity while maintaining security.
Solution Approach 2:
The single screw serves multiple functions simultaneously: it acts as a fastening element to attach the cylinder lock to the bearing bracket, and as a securing element that prevents forced opening by engaging through the bearing bracket. This multi-functionality eliminates the need for separate dedicated fastening and securing components, reducing overall device complexity while maintaining or improving security against forced opening.
2Reliability
If multiple screws and components are used for fastening and securing the cylinder lock, then security against forced opening is improved, but manufacturing and assembly costs increase
Solution Approach 1:
The patent merges fastening and securing functions into a single screw, reducing the total component count. This reduction directly lowers manufacturing costs by requiring fewer parts to be produced, purchased, and managed. Assembly costs are reduced because fewer components need to be individually installed and secured, simplifying the assembly process and reducing labor time.
Solution Approach 2:
The multi-functional screw performs both fastening and securing roles, eliminating the need for multiple specialized components. This universality reduces the bill of materials and simplifies inventory management, thereby reducing manufacturing costs. The simplified assembly process requiring only one screw installation also reduces assembly time and labor costs.
3Reliability
If multiple screws and components are used for fastening and securing the cylinder lock, then security against forced opening is improved, but installation space required increases
Solution Approach 1:
The patent combines fastening and securing functions into a single screw component, reducing the total volume occupied by multiple separate components. The single integrated screw requires less installation space than multiple separate screws and fastening elements would require, while still providing both fastening and securing functions for security against forced opening.
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
This design reduces component costs, simplifies assembly, and saves installation space while maintaining high security against forced opening, with the single screw providing both fastening and securing functions effectively.
Implementation Method 1
The screw interacts with a threaded bore of the shackle element to displace it. By turning the screw, it can be axially displaced relative to the bracket element.
Implementation Method 2
The cylinder bushing has a radial recess that forms a pressure surface, and the screw has a pressure tip at its end facing the cylinder bushing, which is inserted into the radial recess and interacts with the pressure surface to provide axial and radial support for the screw.
Data Source
Figure 1~2
Figure 3~5
AI summary
The invention relates to a locking device (2) for a door (1) or flap, in particular of a vehicle, comprising: a cylinder lock (6), which has a cylinder bush (7) and a cylinder core (8) rotatably supported in the cylinder bush (7); a bearing bracket (3), which can be or is fastened to the door (1) or flap and which has a receptacle (5) for the cylinder lock (6); and a screw (10), which establishes a mechanical connection of the cylinder bush (7) to a trim element (26) for the door (1) or flap. According to the invention, a bow element (9) that radially surrounds the cylinder bush at least in some regions is provided, which bow element is arranged in such a way that the bow element is movably supported on the bearing bracket (3) and has at least one engagement means (20''') for engaging in a hollow (22) of the cylinder bush (7), and that the screw (10) interacts with a threaded hole of the bow element (9) in order to move the bow element, wherein the cylinder bush (7) has a radial recess (18), which forms a pressure surface (17), wherein the screw (10) has a pressure tip (13) at the end of the screw facing the cylinder bush (7), which pressure tip, while inserted in the radial recess (18), interacts with the pressure surface (17) in order to axially and radially support the screw (10).