Folding Stick Guide Pin with Recess for Wet Disassembly
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Solution Overview
Problem
Existing folding sticks face issues with separation of plug connections due to moisture and temperature, leading to difficulty in disassembling without excessive force, especially when the gap between the guide pin and pipe section is small.
Innovation Solution
Incorporating a cylindrical guide section with a circumferential recess on the guide pin, which allows for easy separation even when wet, ensuring the connection remains secure and the outer tube is not damaged under load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the gap between the guide pin and pipe section is made small to ensure secure connection, then the connection strength is improved, but the difficulty of disassembly increases especially when wet
Solution Approach 1:
The guide pin is segmented into three cylindrical sections along its length: a first cylindrical section, a second cylindrical section with smaller diameter, and a third cylindrical section. This segmentation allows the middle section to provide clearance for moisture discharge while the outer sections maintain secure connection, resolving the contradiction between connection strength and ease of disassembly.
Solution Approach 2:
The second cylindrical section of the guide pin acts as an intermediary element that facilitates moisture discharge between the guide pin and pipe section. This intermediate structure with smaller diameter creates a clearance path for moisture to escape, preventing the bonding effect that would otherwise make disassembly difficult while maintaining secure connection at the outer sections.
2Manufacturing precision
If the guide pin outer diameter is made close to the pipe section inner diameter to improve guidance, then the guidance precision is improved, but the reliability decreases due to moisture accumulation
Solution Approach 1:
The guide pin is divided into three cylindrical sections with different diameters. The first and third sections have larger diameters that provide precise guidance and stable connection, while the second middle section has a smaller diameter that creates clearance for moisture discharge. This segmentation allows simultaneous achievement of high guidance precision and reliability in wet conditions.
Solution Approach 2:
Different sections of the guide pin have different local qualities in terms of diameter. The outer sections (first and third) have larger diameters optimized for guidance precision and connection stability, while the middle section (second) has a smaller diameter optimized for moisture discharge. This local differentiation resolves the contradiction between guidance precision and reliability.
Data Source
Figure 1
Figure 2A~2C
Figure 3~4
AI summary
Folding pole (1) with three or four tube sections (7-9), wherein the tube sections (7-9) are aligned with one another in the assembled state of the folding pole (1) via plug connections along the pole axis (32), and at least two tube sections (8, 8', 9) are connected to one another in the folded state only via a movable connecting element (16), characterized in that at least one of the plug connections (17, 34) has a guide pin (17) with a cylindrical guide section (34b, 49) having a smaller or nearly the same outer diameter as the inner diameter of the following tube section to be connected, and with a length (L) in the range of 10-100 mm, wherein the cylindrical guide section (34b, 49) has at least one circumferential recess (29, 33) in its cylindrical surface with a length (I) in the range of 5-50 mm, such that a front guide section (30, 35) and a rear guide section (31,36) of the cylindrical guide section (34b, 49) is formed, wherein the circumferential recess (29, 33) has a cylindrical surface with an outer diameter which is in the range of 0.1-2.0 mm smaller than the outer diameter of the front and rear guide sections,