Headrest Cam Assembly Without Welding for Foldable Support
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Solution Overview
Problem
Conventional headrest apparatuses require complex assembly processes and high production costs due to the need for welding to couple components, making them cumbersome and expensive to manufacture.
Innovation Solution
A simplified headrest apparatus with a stay rod, a fixing cam, a rotating cam, a support spring, and a return spring, where the rotating cam has a through hole larger than the stay rod, allowing it to be fitted around the stay rod and bent portion, and a push member or wire member to facilitate easy assembly and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional headrest apparatuses use welding to couple components, then connection strength is improved, but manufacturing complexity and production cost increase
Solution Approach 1:
The patent replaces the welding process with a mechanical pressing assembly mechanism. The rotating cam and fixing cam engage through protrusions and depressions to securely couple components without thermal joining, eliminating welding complexity while maintaining connection strength through mechanical interlocking
Solution Approach 2:
The patent introduces a pressing member as an intermediary tool that facilitates the assembly of the rotating cam onto the stay rod. This intermediary mechanism enables precise positioning and secure coupling of components through controlled pressing action, replacing the need for welding operations
2Strength
If welding is used to assemble headrest components, then structural integrity is improved, but production cost increases
Solution Approach 1:
The patent substitutes welding with a mechanical pressing system where the rotating cam and fixing cam create secure connections through geometric engagement. This mechanical approach eliminates expensive welding equipment and processes while maintaining structural integrity through precise cam profile design and interlocking features
Solution Approach 2:
The cam mechanism is designed to be self-aligning and self-securing during assembly. The protrusions and depressions automatically engage in the correct positions when pressed together, eliminating the need for complex welding procedures and reducing manufacturing costs while ensuring reliable structural connection
3Reliability
If conventional headrests have complex assembly processes, then connection reliability is improved, but assembly time increases
Solution Approach 1:
The patent replaces multi-step welding procedures with a single pressing action that simultaneously achieves component alignment, positioning, and secure coupling. The cam profiles are designed to guide components into correct positions during pressing, ensuring reliable connections while dramatically reducing assembly time
Solution Approach 2:
The cam components are pre-designed with specific protrusion and depression geometries that ensure proper alignment and engagement before the pressing operation. This preliminary design of the engagement features allows the assembly to be completed in one rapid pressing motion without requiring multiple adjustment or welding steps
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 simplifies the assembly process and reduces production costs by eliminating the need for welding, while ensuring the headrest can be easily folded and maintained in an upright position with reliable support.
Implementation Method 1
a support spring (50) which applies elastic force to the rotating cam (40) so that the rotating cam (40) is biased to the fixing cam (30)
Implementation Method 2
a return spring (60) which has a first end (61) fixed in place, and a second end (62) connected to the rotating cam (40)
Data Source
AI summary
Disclosed herein is an apparatus for moving a headrest. The apparatus includes a stay rod, a fixing cam which is fixed to the stay rod and provided with a locking protrusion, a rotating cam which is provided on the fixing cam and has an insert depression into which the locking protrusion is inserted, a support spring which biases the rotating cam to the fixing cam, and a return spring which has a first end fixed in place and a second end connected to the rotating cam. The fixing cam has a spring support supporting the support spring. The rotating cam has a through hole which has a diameter greater than a diameter of the stay rod so that the rotating cam can be provided around the stay rod after passing through one end of the stay rod and a bent portion of the stay rod.