Head Restraint Holding Rod Bore Mount to Prevent Loosening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head restraint holding rods in vehicle seats are prone to loosening due to mechanical stresses, leading to instability and potential detachment.
Innovation Solution
A holding rod design featuring a hollow bore at the rod end with a mounting part, such as a press-fit or rivet nut, which is inserted and joined securely to the rod end, allowing for a tight connection with a screw element, and optionally enhanced by a securing element like a U-profile clamping part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional attachment method is used for the holding rod on the backrest frame, then the device complexity is low, but the reliability deteriorates due to loosening under mechanical stresses
Solution Approach 1:
The mounting part is inserted into the hollow bore of the holding rod, creating a nested structure where one component is placed inside another. This nesting approach provides a robust connection that resists loosening under mechanical stresses while maintaining a relatively simple overall structure.
Solution Approach 2:
The holding rod is divided into functional segments: the hollow bore section for receiving the mounting part, and the attachment section for connecting to the backrest frame. This segmentation allows each part to be optimized for its specific function, improving overall reliability.
2Ease of manufacture
If the rod end is countersunk or compressed to simplify insertion, then the ease of manufacture is improved, but the strength may deteriorate
Solution Approach 1:
The hollow bore is countersunk or compressed only at the specific location where the mounting part is inserted, rather than modifying the entire rod end. This localized modification facilitates easy insertion of the mounting part while preserving the overall strength and structural integrity of the holding rod.
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 solution provides a robust and secure attachment that resists loosening, ensuring the head restraint remains firmly attached to the vehicle seat even under mechanical stress.
Implementation Method 1
a mounting part, in particular a press-fit nut or rivet nut, is inserted into the hollow bore and is joined to the rod end, in particular pressed in, tightened or riveted
Implementation Method 2
a fastening means, such as a screw element, in particular a threaded bolt or a threaded screw, can be connected to the holding rod in a simple manner with a form-fit and force-fit
Data Source
AI summary
A holding rod for a head restraint, where the holding rod is provided with a hollow bore at a free rod end. A mounting part is inserted into the hollow bore and is joined to the free rod end. A head restraint and a vehicle seat with the head restraint are also provided.