Vehicle Headrest Stopper Member Design for Pull-Out Prevention
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Solution Overview
Problem
Conventional headrest structures require complex mechanical procedures and labor-intensive assembly to prevent unintentional removal from a seatback, involving multiple components like rotating stoppers and shafts.
Innovation Solution
A simplified configuration using a stopper member with a circular cylinder portion, cantilevered projection, and restriction portions that engage with a stay member to prevent removal by abutting the support members, allowing for easy assembly and effective prevention of headrest detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional structure with rotating stopper and shaft is used to prevent headrest removal, then pull-out prevention is achieved, but assembly complexity and labor increase significantly
Solution Approach 1:
The patent combines multiple functions into a single integrated stopper member. The stopper member includes a circular cylinder portion inserted into the stay member, a cantilevered portion with projection that engages with a through hole, and a restriction portion that abuts the support member. This single component replaces the conventional separate rotating stopper and shaft assembly, achieving pull-out prevention while simplifying the structure and reducing assembly complexity
Solution Approach 2:
The stopper member performs multiple functions simultaneously: the circular cylinder portion provides insertion and positioning, the cantilevered portion with projection engages with the through hole to prevent rotation and axial movement, and the restriction portion abuts the support member to prevent pull-out. This multi-functional design eliminates the need for separate components for each function, reducing assembly steps while maintaining reliability
2Reliability
If multiple mechanical procedures like slit forming and hole forming are used, then pull-out prevention is provided, but manufacturing time and labor increase
Solution Approach 1:
The patent integrates the stopper functionality into a single molded component rather than assembling multiple parts. The stopper member is formed as one piece with the circular cylinder portion, cantilevered portion, and restriction portion all integrated, eliminating the need for separate slit forming, hole forming, and assembly operations required by conventional structures
Solution Approach 2:
The stopper member is designed to be inserted into the stay member and automatically engage with the through hole and abut the support member through its own structural features. The projection portion engages with the through hole and the restriction portion abuts the support member without requiring additional fastening operations, allowing for quick installation while maintaining secure pull-out prevention
Data Source
AI summary
There is provided a headrest including a main body member, a stay member, and a stopper member, the stopper member including a circular cylinder shaped circular cylinder portion, a cantilevered portion, a projection portion, and a restriction portion that is formed extending from the circular cylinder portion so as to abut an end portion of a support member when an attempt is made to pull the stay member out from the support members in a projecting state in which both end sides of the stay member are inserted into the support member and project out from end portions of the support members, thereby restricting pulling out of the stay member from the support members.