Dual-Function Fastener for Vehicle Lock Cylinder Assembly
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Solution Overview
Problem
Existing lock cylinder devices require multiple cumbersome fasteners for assembly, consuming space and complicating the handling process, especially when attaching a hood to a carrier from the inside of a door.
Innovation Solution
A dual-function fastener secures the hood to the carrier and holds a preassembled lock cylinder unit in place, using a threaded screw with a shank and head that engages aligned holes in both components, allowing for simplified assembly from the inside of the door.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple fasteners are used to attach the hood and lock cylinder to the carrier, then the attachment is secure, but the assembly process becomes cumbersome and space-consuming
Solution Approach 1:
The patent combines multiple fastening functions into a single integrated fastener. The fastener includes a fastening element that attaches the hood to the carrier and a retaining element that holds the lock cylinder in place, eliminating the need for separate fasteners for each component.
Solution Approach 2:
The fastener is designed as a multi-functional component that simultaneously performs multiple tasks: securing the hood to the carrier, holding the lock cylinder in position, and providing a retaining function. This universal fastener replaces what would traditionally require multiple specialized fasteners.
2Reliability
If multiple fasteners are used for assembly, then each component can be securely fixed, but the space required for placement and handling increases
Solution Approach 1:
The fastening and retaining functions are merged into a single fastener assembly, reducing the number of discrete components that need to be placed and handled during assembly. This consolidation reduces the spatial requirements for the assembly process.
Solution Approach 2:
The universal fastener performs multiple functions in a single component, reducing the overall volume and space required for multiple specialized fasteners. The integrated design allows all fastening and retaining operations to be performed through one compact assembly.
Data Source
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AI summary
A construction unit (35) comprising a support (30) and a locking cylinder (20) is present in the device and is secured from the inner door side (11) behind the outer door lining (15). Those parts of the locking cylinder which project on the outer door side are covered by a cap which is secured on the inner door side (11) by securing means. In order to simplify the handling and to save space, it is proposed to use the securing means for the cap at the same time in order to also secure the construction unit (35) on the inner door side (11).