Height-Adjustable Handrest Pin-Slot Structure for Precise Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional height-adjustable handrests for chairs are complex and costly to assemble, with mechanisms that complicate user operation and increase processing costs.
Innovation Solution
A novel design featuring a middle bar element with a spring-containing space, an inner bar element, a support unit, and a press element that allows for height adjustment by a user-operated pin mechanism, enabling precise positioning without restraints and reducing assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional height-adjustment mechanism is used with multiple components and restraints, then the handrest can be positioned precisely, but the assembly becomes complex and costly
Solution Approach 1:
The patent applies nesting by placing the inner bar element inside the middle bar element, and the middle bar element inside the handrest external bar. This nested structure allows multiple functional components to be integrated in a compact arrangement, reducing overall complexity while maintaining positioning precision through the coordinated interaction of nested elements with slots and restraints.
Solution Approach 2:
The height-adjustment mechanism is segmented into distinct functional components: the handrest external bar with slots for positioning, the middle bar element with internal space for the spring, and the inner bar element with the pin mechanism. This segmentation allows each component to perform its specific function independently, simplifying manufacturing and assembly while achieving precise positioning through their coordinated interaction.
2Reliability
If a complex switching unit and control element mechanism is used, then the handrest can be fixed in place precisely, but the processing cost increases
Solution Approach 1:
The spring mechanism provides self-service by automatically exerting upward thrust on the inner bar element to engage the pin with the slots for precise positioning, and automatically releasing the pin when the press element is actuated. This self-service mechanism eliminates the need for complex control elements and switching units, reducing processing costs while maintaining fixing reliability through the inherent mechanical properties of the spring and pin-slot interaction.
Solution Approach 2:
The patent replaces complex mechanical switching units and control elements with a simpler spring-based mechanical system. The spring provides continuous upward thrust to maintain engagement, and the press element directly actuates the pin release through mechanical leverage, eliminating the need for sophisticated switching mechanisms and reducing manufacturing complexity and cost.
3Manufacturing precision
If multiple restraints and control elements are used for height adjustment, then the positioning is precise, but the ease of operation decreases
Solution Approach 1:
The patent extracts the essential function of height adjustment by removing unnecessary control elements and switching units. The core mechanism consists of the pin that can freely move in the inclined oblong hole of the inner bar element, allowing the handrest to adjust height by simply pressing the press element, which releases the pin from the slots. This extraction of essential functionality maintains positioning precision through the pin-slot interaction while dramatically simplifying user operation.
4Adaptability or versatility
If a conventional design with separate components is used, then the handrest can be adjusted, but the assembly time increases
Solution Approach 1:
The patent merges multiple functions into integrated components: the middle bar element combines the structural support function with the spring housing and pin guidance features; the inner bar element combines the press element actuation with the pin mechanism and inclined oblong hole for automatic engagement. This merging of functions into fewer integrated components reduces the number of assembly steps and increases assembly speed while maintaining full adjustability through the coordinated interaction of the merged components.
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 design simplifies assembly, reduces costs, and allows for easy and precise height adjustment of handrests, enhancing user convenience and operational efficiency.
Implementation Method 1
the middle bar element has an internal space for containing a spring and an inner bar element
Implementation Method 2
the press element has one end abutting against an upper end of the inner bar element and has the other end protruding under an upward thrust from the spring
Data Source
AI summary
A height-adjustable handrest has constituent components describe below. A middle bar element is inserted into a handrest external bar and has an internal space for containing a spring and an inner bar element. The handrest external bar is enclosed by a support unit with an upper end pivotally coupled to a press element. The press element has one end abutting against the inner bar element and has the other end protruding under an upward thrust from the spring. A pin passing through slots formed at the handrest external bar to penetrate oblong holes disposed at the inner bar element and the middle bar element, respectively. When pressed, the press element drives the inner bar element to move downward, thereby moving the pin upward along the inclined oblong hole of the inner bar element, compressing the spring downward, and moving the pin into a longitudinal channel of the handrest external bar.