Work chair
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Solution Overview
Problem
Conventional work chairs are inconvenient and inefficient due to the need to spread leg bands over thighs and pull cushion chairs down manually when sitting or standing, leading to potential falls and reduced working efficiency.
Innovation Solution
A work chair design featuring a pelvis belt wrapped around the pelvis and a safety belt fastened vertically between the legs, forming a three-dimensional triangular structure with auxiliary pelvis belts to center the cushion chair on the buttocks, along with a fastening hook system for secure and adjustable fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional work chairs use leg bands that need to be spread over thighs and pulled up, then the chair can be worn, but the operation becomes inconvenient and time-consuming
Solution Approach 1:
The safety belt system is divided into multiple segments: pelvis belt portion wrapped around the pelvis, safety belt portion extending between the legs, and auxiliary pelvis belts. This segmentation allows each part to be independently positioned and fastened, simplifying the overall wearing process and reducing the time required.
Solution Approach 2:
The pelvis belt portion is first wrapped around the pelvis and fixed, establishing a stable base. Then the safety belt portion is pulled up between the legs to center the cushion chair. This preliminary positioning action eliminates the need for subsequent manual adjustments when sitting or standing.
2Reliability
If the cushion chair is not firmly centered on the buttocks, then the structure remains simple, but the worker may fall when repeatedly sitting and standing
Solution Approach 1:
The fastening system applies different types of constraints at different locations: the pelvis belt provides horizontal circumferential constraint, the safety belt provides vertical constraint between the legs, and the auxiliary pelvis belts provide additional horizontal support. This localized quality distribution ensures firm centering of the cushion chair without requiring excessive complexity throughout the entire system.
Solution Approach 2:
The fastening system transitions from two-dimensional (horizontal pelvis belt only) to three-dimensional constraint by adding the safety belt portion that extends vertically between the legs. This dimensional addition creates a triangular stable structure that firmly centers the cushion chair on the buttocks, preventing falls during movement.
3Productivity
If manual pulling is required to reposition the cushion chair after standing, then the structure remains simple, but working efficiency deteriorates
Solution Approach 1:
The safety belt system is designed to automatically maintain the cushion chair in the centered position through its geometric constraint structure. When the worker stands or moves, the triangular arrangement of the pelvis belt, safety belt, and auxiliary belts self-adjusts to keep the cushion chair firmly positioned, eliminating the need for manual repositioning and thereby maintaining high working efficiency.
4Adaptability or versatility
If the safety belt is made adjustable for different body shapes, then adaptability improves, but the fastening mechanism becomes more complex
Solution Approach 1:
The safety belt system incorporates adjustable length mechanisms that allow dynamic adaptation to different body shapes and sizes. The pelvis belt and safety belt portions can be adjusted in length and positioning, enabling the same basic structure to accommodate various anatomical differences without requiring multiple specialized designs, thus balancing adaptability with controlled complexity.
Data Source
AI summary
A work chair is provided herein a worker wears a pelvis belt in a transverse direction from both sides of a cushion chair so as to surround the pelvis, while simultaneously wearing a safety belt between both legs and along the front of the pelvis belt in a longitudinal direction by pulling the lower side of the cushion chair, thus allowing the centering position of the cushion chair to be firmly held against the buttocks around the anus, even when the worker repeatedly sits down and stands up and waddles, and maximizing convenience of use. Moreover, by correctly positioning the cushion chair, the worker can be prevented from filling on his or her buttocks while working, thus ensuring safety during use. Furthermore, the work chair ensures that the cushion chair is centered around the anus when the safety belt is worn, whereas an attachment/detachment ring is returned upward and fitted into a collecting ring when the safety belt is not worn. Accordingly, the length of the safety belt itself is simply reduced to be small, thus preventing safety accidents. Also, the safety belt is prevented from haphazardly hanging out when storing the work chair, thus ensuring tidiness when the work chair is stored.