Adjustable Tattoo Chair Backrest and Hydraulic Height Control
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Solution Overview
Problem
Existing tattoo chairs lack adjustability, making it inconvenient to tattoo areas other than the shoulders, leading to discomfort for both the person receiving the tattoo and the artist, as the height of the brace is not adjustable, restricting comfortable positioning.
Innovation Solution
A tattoo chair design featuring a rotatable backrest with adjustable inclination, a hydraulic lifting brace, and a leg rest that can be adjusted from horizontal to vertical, along with detachable armrests and a headrest, allowing for various poses and improved comfort through snap spring mechanisms and a hook-and-loop fastener for the cushion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the backrest is fixed vertically to the seat, then the chair structure is simple and stable, but it is inconvenient to tattoo body parts other than shoulders and causes fatigue for both artist and client
Solution Approach 1:
The backrest is designed to be rotatable relative to the seat through a hinge connection, allowing it to change from a fixed vertical position to an inclined position. This dynamic adjustment enables the chair to adapt to different tattooing needs (shoulder, back, belly, waist, leg) without requiring multiple specialized chairs, thus improving versatility while maintaining reasonable structural complexity
Solution Approach 2:
The backrest is divided into multiple segments or sections that can be independently adjusted. The supporting rod can be positioned at different locations along the backrest, allowing selective inclination adjustment of different portions. This segmentation enables precise adaptation to various body parts while keeping the overall structure manageable
2Adaptability or versatility
If the brace height is fixed, then the chair structure is simple and stable, but it cannot provide different heights for comfortable positioning
Solution Approach 1:
The brace incorporates a hydraulic lifting device that uses hydraulic principles to enable smooth height adjustment. The hydraulic mechanism provides controlled motion and force multiplication, allowing the brace to be adjusted to different heights with minimal effort while maintaining stability at each position. This approach achieves height adaptability without requiring complex mechanical linkages or multiple fixed-height components
3Reliability
If the supporting rod is held in the groove without additional mechanisms, then the structure is simple, but the rod may unexpectedly fall out causing safety issues
Solution Approach 1:
A spring mechanism is installed between the lower part of the inner side of the seat and the supporting rod to provide beforehand cushioning. The spring acts as a retention force that prevents the supporting rod from unexpectedly falling out of the groove while allowing intentional adjustment. This proactive safety measure enhances reliability by anticipating and preventing potential failures without requiring complex locking mechanisms
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
Enables the person receiving the tattoo to adopt different poses, reducing discomfort and facilitating the artist's work, allowing for easier access to all body parts and improved wear resistance, comfort, and convenience.
Implementation Method 1
a spring is provided between the lower part of inner side of the seat and the supporting rod
Implementation Method 2
the brace is a hydraulic lifting device with its height adjusted via a pedal
Data Source
AI summary
A tattoo chair includes a backrest, a seat, a brace for supporting the seat, and a base for allowing the chair to stand stably. The lower end of the backrest is rotatably attached to the inner side of the seat. A supporting fixed plate is provided under the bottom surface of the seat. At least one fixed gear rack is mounted from top to bottom on the rear surface of the backrest. A supporting rod is provided on the supporting fixed plate. One end of the supporting rod is rotatably attached to the supporting fixed plate, and the other end is put into one of grooves of the gear rack on the rear surface of the backrest.